Light curable dental composition
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation application of application Ser. No. 768,546 filed August 23, 1985, now U.S. Pat. No. 4,746,685. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to a light curable dental composition, and more particularly to a dental composition which can be cured by irradiation of light to be utilized for teeth crown materials, denture base materials, dental cementing materials, dental bonding materials, dental filling materials, dental impression materials and caries-preventive materials. 
     2. Related Art Statements 
     Heat-polymerizable dental compositions wherein organic peroxides, such as benzoyl peroxide, are used as the polymerization initiators and cold-setting type dental compositions wherein Redox type polymerization initiators, such as a combination of benzoyl peroxide with a tertiary amine, are used as the polymerization initiators have been known in the art. Further known in the art is a composition containing a sensitizer such as benzoin alkyl ether to be cured by irradiation of ultraviolet rays. 
     However, the known heat-polymerizable and cold-setting type dental compositions have a disadvantage that the cured resins tend to contain air bubbles to lower the mechanical strengths and water-proof properties, since they are prepared by mixing a powder with a liquid or kneading a paste with another paste. In addition, the heat-polymerizable dental compositions have another disadvantage that a complicate and time-consuming operation is required for polymerization. On the other hand, the cold-setting type dental compositions have additional disadvantages that the curing speed thereof is too high to cause difficulties in clinical operation, and that the formed denture is colored to deteriorate the appearance due to the undesirous action by the tertiary amine. 
     The composition containing an ordinary light polymerization initiator sensitive to ultraviolet rays, such as benzoin alkyl ether, gives rise to problems that the transmittance to ultraviolet rays effective to polymerization or curing is so low as to limit the depth of cured composition only to less than 2 mm resulting in unsatisfactory curing depth, that a filter or other protection means is indispensable since the ultraviolet rays contain the rays having wavelengths of less than 320 nm which are harmful to human being, and that the lifetime of a mercury lamp used as the irradiation source is short so that the lamp is damaged soon. 
     Further known in the art is an one-paste type dental composition containing a light polymerization initiator. However, the known dental composition of this type has disadvantages that the mechanical strengths, particularly the bending strength, of the cured product is low, and that it is inferior in handling ease or operation facility when used in practical operation. 
     OBJECTS AND SUMMARY OF THE INVENTION 
     A primary object of this invention is to provide a light curable dental liquid or paste which can be readily cured by irradiation of light within a short time period to give a cured product which is set deep in the interior region thereof. 
     Another object of this invention is to provide a light curable dental liquid or paste which is inexpensive and excellent in curing property, and yet ensures safe and easy operation in clinical application. 
     A further object of this invention is to provide a light curable dental liquid or paste which forms a colorless cured product of clear appearance. 
     A still further object of this invention is to provide a light curable dental liquid or paste which has a surface of lower adhesiveness to make the handling in clinical operation easier and forms a cured product having higher mechanical strengths including the bending strength. 
     The above and other objects of the invention will become apparent from the following description. 
     A light curable dental liquid or paste provided in accordance with the present invention comprises an ethylenic unsaturated compound and a light polymerization initiator, said light polymerization initiator comprising a combination of an α-diketone and a polyperoxy ester containing a benzophenone group and represented by the following general formula (I) of: ##STR2## 
     wherein R 1  and R 1  &#39; each represents the same or different group and stands for a tertiary alkyl group having 4 to 8 carbon atoms or a tertiary aralkyl group having 9 to 12 carbon atoms and R 2  and R 2  &#39; each represents the same or different atom or group and stands for a hydrogen atom, a tertiary alkoxy group having 4 to 8 carbon atoms or a tertiary aralkyloxy group having 9 to 12 carbon atoms. 
     DESCRIPTION OF THE INVENTION 
     The present invention will be described in detail hereinbelow. 
     The light curable dental composition, according to the invention, comprises an ethylenic unsaturated compound and a of specific light polymerization initiator. 
     Any ethylenic unsaturated compounds which have been conventionally used in the dental compositions may be used conveniently in the composition of the invention, the examples being derivatives of methacrylic acid, such as methyl methacrylate, 2-hydroxyethyl methacrylate, neopentylglycol dimethacrylate, 1,4-butanediol dimethacrylate, ethyleneglycol dimethacrylate, diethyleneglycol dimethacrylate, triethyleneglycol dimethacrylate, polyethyleneglycol dimethacrylate, propyleneglycol dimethacrylate, dipropyleneglycol dimethacrylate, tripropyleneglycol dimethacrylate, polypropyleneglycol dimethacrylate, tetromethylolmethane trimethacrylate, tetramethylolmethane tetramethacrylate, hexamethyleneglycol dimethacrylate, 2,2-bis(4-methacryloxyphenyl)propane, 2,2-bis(4-methacryloxyethoxyphenyl)propane, 2,2-bis(4-methacryloxypolyethoxyphenyl)propane, 2,2-bis[4-(3-methacryloxy-2-hydroxypropoxy)phenyl]propane, 1,2-bis(3-methacryloxy-2-hydroxypropoxy)ethane, 2,2-bis(4-methacryloxyphenyl)propane, 2-hydroxy-1,3-dimethacryloxypropane, di-2-methacryloxyethyl-2,2,4-trimethylhexamethylene dicarbamate, 2-hydroxy-3-phenoxypropyl methacrylate, 2-hydroxy-3-p-t-butylphenoxypropyl methacrylate, methacryloxyethylphenylphospholic acid, 4-methacryloxyethyl trimellitate anhydride and mixtures thereof. Other derivatives of acrylic acid, styrene and derivatives of styrene may also be used in the present invention. Curable resins having maleate, fumarate, allyl or (meth)acrylate groups, unsaturated polyester resins, unsaturated acrylic resins, or acrylate oligomers modified with isocyanate, polyester-acryl oligomers, polyether-acryl oligomers, etc. may be used in the present invention. 
     The specific light polymerization initiator which is used in the invention is a combination of an α-diketone and a polyperoxy ester containing a benzophenone group and represented by the following general formula (I) of: ##STR3## wherein R 1  and R 1  &#39; each represents the same or different group and stands for a tertiary alkyl group having 4 to 8 carbon atoms or a tertiary aralkyl group having 9 to 12 carbon atoms and R 2  and R 2  &#39; each represents the same or different atom or group and stands for a hydrogen atom, a tertiary alkoxy group having 4 to 8 carbon atoms or a tertiary aralkyloxy group having 9 to 12 carbon atoms. 
     The polyperoxy esters represented by the general formula (I) wherein the carbon number in either of R 1  or R 1  &#39; exceeds 9 are inferior in polymerization initiating function due to depression in active oxygen emission. Likewise, the polyperoxy esters represented by the general formula (I) wherein the carbon number in either of R 2  or R 2  &#39; exceeds 13 are inferior in polymerization initiating function. A single or a combination of two or more polyperoxy esters containing a benzophenone group and represented by the general formula (I) may be used in the invention, and the specific examples thereof include 3,3&#39;,4,4&#39;-tetra-(t-butylperoxycarbonyl)benzophenone, 3,3&#39;,4,4&#39;-tetra-(t-amylperoxycarbonyl)benzophenone, 3,3&#39;,4,4&#39;-tetra-(t-hexylperoxycarbonyl)benzophenone, 3,3&#39;,4,4&#39;-tetra-(t-octylperoxycarbonyl)benzophenone, 3,3&#39;,4,4&#39;-tetra-(cumylperoxycarbonyl)benzophenone, 3,3&#39;,4,4&#39;-tetra-(p-isopropylcumylperoxycarbonyl)benzophenone, 3,3&#39;-dicarboxy-4,4&#39;-di(t-butylperoxycarbonyl)benzophenone, 3,3&#39;-dicarboxy-4,4&#39;-di(t-hexylperoxycarbonyl)benzophenone and mixtures thereof. A single or a mixture of two or more polyperoxy esters each having a benzophenone group may be combined with a single or a mixture of two or more α-diketones. Any α-diketones may be used as far as they have a peak absorption at a wavelength of 400 nm to 700 nm, the specific examples being biacetyl, 2,3-pentadione, 2,3-octadione, benzil, 4,4&#39;-dimethoxybenzil, 4,4&#39;-oxybenzil(4,4&#39;-dihydroxybenzil), 4,4&#39;-dichlorobenzil acenaphthenequinone, 9,10-phenanthrenequinone, camphorquinone and β-naphthoquinone. Any one or a mixture of the α-diketones may be used. Particularly preferred α-diketones are acenaphthenequinone, 9,10-phenanthrenequinone, camphorquinone and β-naphthoquinone. 
     The concentration of the α-diketone ranges preferably within 0.01 to 10 parts by weight, more preferably within 0.1 to 5 parts by weight, based on 100 parts by weight of the ethylenic unsaturated compound. If the concentration of α-diketone is less than 0.01 part by weight, no appreciable effect is provided by the addition of α-diketone. On the contrary, if the concentration of α-diketone is more than 10 parts by weight, not all of the added α-diketone is dissolved in the composition or the depth of curing is decreased, in addition to undesirable hygienic influence. 
     The concentration of the polyperoxy ester having a benzophenone group ranges preferably within 0.01 to 10 parts by weight, more preferably within 0.1 to 5 parts by weight, based on 100 parts by weight of the ethylenic unsaturated compound. If the concentration of the polyperoxy ester having a benzophenone group is less than 0.01 part by weight, no appreciable effect is provided by the addition of polyperoxy ester having a benzophenone group. On the contrary, if the concentration of the polyperoxy ester having a benzophenone group is more than 10 parts by weight, not all of the added polyperoxy ester is dissolved in the composition or the properties of the cured product are deteriorated, in addition to undesirable hygienic influence. 
     When a combination of the α-diketone and the polyperoxy ester having a benzophenone group is used as the light polymerization initiator, the composition may be readily cured by irradiation of a visible ray having a wavelength of from 400 nm to 700 nm for a short time period in a depth of curing of not less than 4 mm so that the composition can be well adapted for curable dental applications. 
     The light curable dental composition, according to the invention, may contain fine particles of inorganic filler with or without the addition of high polymer surface active agent. Preferable inorganic filler used for this purpose include apatite, soda-lime glass, silica, quartz, borosilicate glass, alumina, barium oxide, zirconium glass and mixtures thereof. A particularly preferred inorganic filler is a silica having an average particle size of from 1 to 100 millimicrons and being treated to be hydrophobic with a treating agent, such as dimethyldichlorosilane, hexamethyldisilazane, octyltrimethoxysilane or silicone oils, because such silica is improved in light transmittance, water-proof property and thixotropy. 
     High polymer surface active agents which may be added to the composition of the invention include copolymers each being prepared by copolymerizing an unsaturated monomer represented by the following general formula (II) of: ##STR4## wherein R 1  is a hydrogen atom or a methyl group, 
     R 2  is an alkyl group having 1 to 4 carbon atoms or a phenyl group, and n is an integer of 1 to 15; 
     with an unsaturated ester copolymerizable with the monomer represented by the general formula (II). The copolymers prepared from unsaturated monomers represented by the general formula (II) wherein n exceeds 15 are not preferred, since they become so hydrophilic as to have lower water-proof property of the product composition. 
     The specific examples of the unsaturated monomer represented by the general formula (II) are methoxyethyl (meth)acrylate, phenoxyethyloxyethyl (meth)acrylate, methoxydiethyleneglycol (meth)acrylate, methoxytetraethyleneglycol (meth)acrylate, isobutoxytetraethyleneglycol (meth)acrylate, methoxypolyethyleneglycol (meth)acrylate, ethoxypolyethyleneglycol (meth)acrylate, isopropoxypolyethyleneglycol (meth)acrylate, isobutoxypolyethyleneglycol (meth)acrylate, phenoxypolyethyleneglycol (meth)acrylate and mixtures thereof. In the specific examples listed above, &#34;poly&#34; means that n indicating the number of respective repeating unit ranges within 5 to 15. 
     Examples of the unsaturated ester copolymerizable with the aforementioned monomer (II) are (meth)acrylic esters such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate and mixtures thereof. 
     The aforementioned copolymers may be prepared through ordinary solution polymerization, suspension polymerization or emulsion polymerization while using a radical polymerization initiator. The molecular weight of the copolymer ranges preferably from 10 to 500 thousands in consideration of solubility and lower adhesiveness. 
     The composition of the invention containing fine particles of an inorganic filler and a high polymer surface active agent selected from the copolymers listed above, may be conveniently used as a denture base material and as a dental impression material. It is desirous that 30 to 80 parts by weight of one or more of the ethylenic unsaturated compounds are mixed with 50 to 10 parts by weight of fine particles of one or more of the aforementioned inorganic fillers and 0.1 to 20 parts by weight of one or more of the aforementioned copolymers acting as effective surface active agents. The compositions outside of the aforementioned mixing range are inconvenient since they form sticky pastes or form pastes which are too low in viscosity to lose integrity for maintaining a stable shape, or eventually they cannot form pastes. The composition containing the dental filling material and the surface active agent, as aforementioned, provides a dental composition of paste form which has a pertinent viscosity and a low surface tackiness to be adapted for easy application in clinical operation, and is cured to form a cured mass having excellent mechanical strengths, particularly superior in bending strength. 
     Any of the dental compositions prepared in accordance with the present invention, irrespective of the particular light polymerization initiator selected from the group defined in the appended claims with or without the addition of the fine particles of any one or more inorganic fillers and high polymer surface active agents, may be further added with an additional dental filling material which has been ordinarily used in dental application. Examples of such a dental filling material are apatite, soda-lime glass, silica, quartz, silica gel, borosilicate glass, synthetic sapphire (alumina) and radioactive opaque filling materials, such as barium oxide and zirconium glass. The dental filling material may be in the form of beads, micro-powders, micro-plates, fibers or whiskers, or may have irregular shapes. In addition to the aforementioned ingredients, an appropriate amount of other dental additives, such as binder resin, polymerization inhibitor, antioxidant, stabilizer, pigment, dye or viscosity increasing agent, may be added, as desired. 
     The dental composition of the invention may be mixed by a manufacturer, charged in a sealed container in the form of a composite liquid or paste, and supplied to a dentist or a dental technician. A dentist or dental technician may apply or fill the dental composition of the invention thus supplied to mold the same, and then the composition is irradiated by a light from an irradiation source to be polymerized and cured. 
     Any irradiation sources may be used for curing the composition of the invention as far as they generate lights having wavelengths within the aforementioned range, examples being a xenon lamp, a halogen lamp, a tungsten lamp, a fluorescent lamp, a metal halide lamp and a laser. 
     The dental composition of the invention can be cured readily by irradiation of light within a short time period to be cured deeper in the interior region and is superior over the conventional composition using a polymerization initiator sensitive to ultraviolet rays. The dental composition of the invention is further improved in safe and easy handling in clinical operation and in economical viewpoint. 
    
    
     EXAMPLES OF THE INVENTION 
     The present invention will now be described more specifically by referring to examples and comparative examples. It should be noted here that the following examples are given by way of example only, and the present invention is not limited thereby. 
     Examples 1 to 10 
     Each of the compositions, as set forth in Table 1, was prepared by dissolving the organic peroxide and the sensitizer in the ethylenic unsaturated compound. The composition was filled in a polyethylene cylinder having an inner diameter of 10 mm and a depth of 10 mm, and exposed to visible light ray irradiation from a halogen lamp (150 watts, Maximum Irradiation Wavelength: 490 nm) placed above the cylinder by 3 mm to be polymerized and cured. The depth of curing of each composition was measured using a micrometer after the polymerized and cured mass was recovered from the cylinder and the unreacted material was removed therefrom. The results are shown in Table 1. 
     As should be appreciated from the results set forth in Table 1, the dental compositions of the invention were cured deep in the interior region (to have a depth of curing of not less than 5 mm) by exposure to visible lights for a short time period of about 20 to 40 seconds to be adapted for use as excellent teeth crown materials, denture base materials, dental cementing repair materials and dental impression materials while being improved in handling ease in clinical operation. 
     Comparative Example 1 
     A test sample was prepared by using 100 parts by weight of triethyleneglycol dimethacrylate as the ethylenic unsaturated compound, 2.0 parts by weight of di-t-butylperoxy isophthalate as the organic peroxide, and 0.5 part by weight of benzoinisobutyl ether as the sensitizer without the addition of a pyrylium salt compound. The other procedures were similar to Examples 1 to 10. The test sample was not cured after being exposed to light irradiation for 180 seconds, after all. The result revealed that the composition containing a conventional sensitizer sensitive to ultraviolet rays was not cured by exposure to visible light irradiation. 
     
                                           TABLE 1                                 
__________________________________________________________________________
Ethylenic Unsaturated                                                     
                   Organic       Exposure                                 
                                      Depth of                            
Compound*.sup.1    Peroxide*.sup.2                                        
                          Sensitizer*.sup.3                               
                                 Time Curing                              
(part by wt.)      (part by wt.)                                          
                          (part by wt.)                                   
                                 (sec)                                    
                                      (mm)                                
__________________________________________________________________________
Example 1                                                                 
      3G 100       LPO 1.0                                                
                          BMTF 0.010                                      
                                 20   7.2                                 
Example 2                                                                 
      3G 100       BPO 1.0                                                
                          BMPF 0.010                                      
                                 30   5.0                                 
Example 3                                                                 
      3G 100       PBIF 2.0                                               
                          BMTF 0.010                                      
                                 35   6.5                                 
Example 4                                                                 
      3G 100       TBB 2.0                                                
                          BMPF 0.010                                      
                                 40   6.5                                 
Example 5                                                                 
      3G 50 &amp; bis-GMA 50                                                  
                   PBIF 1.5                                               
                          BMTF 0.012                                      
                                 30   6.3                                 
Example 6                                                                 
      3G 50 &amp; bis-GMA 50                                                  
                   TBB 2.0                                                
                          BMTF 0.005                                      
                                 20   7.5                                 
Example 7                                                                 
      3G 50 &amp; bis-GMA 50                                                  
                   PH25Z 2.0                                              
                          BMTF 0.010                                      
                                 35   6.2                                 
Example 8                                                                 
      bis-GMA 50 &amp; UDMA 50                                                
                   TBB 1.5                                                
                          MPTF 0.010                                      
                                 20   7.3                                 
Example 9                                                                 
      bis-GMA 50 &amp; HMDA 50                                                
                   PBIF 2.0                                               
                          APTP 0.005                                      
                                 30   6.3                                 
Example 10                                                                
      HDMP 100     TBB 1.0                                                
                          BPPA 0.020                                      
                                 30   6.4                                 
__________________________________________________________________________
 Note:                                                                    
 *.sup.1 3G: Triethylenglycol Dimethacrylate                              
 bisGMA: 2,2Bis[4(3-methacryloxy-2-hydroxypropoxy)phenyl]propane          
 UDMA: Di2-methacryloxyethyl-2,2-4-trimethylhexamethylene Dicarbamate     
 HMDA: Hexamethyleneglycol dimethacrylate                                 
 HDMP: 1,2Bis(3-methacryloxy-2-hydroxypropoxy)ethane                      
 *.sup.2 LPO: Lauroyl Peroxide                                            
 BPO: Benzoyl Peroxide                                                    
 PBIF: Dit-butyldiperoxy Isophthalate                                     
 TBB: 3,3&#39;,4,4Tetra(t-butylperoxycarbonyl) Benzophenone                   
 PH25Z: 2,5Dimethyl-2-5-di(benzoylperoxy)hexane                           
 *.sup.3 BMTF: 4(4-Butoxyphenyl)-2,6-bis(4-methoxyphenyl)thiopyrylium     
 Fluoroborate                                                             
 BMPF: 4(4-Butoxyphenyl)-2,6-bis(4-methoxyphenyl)pyrylium Fluoroborate    
 MPTF: 2,6Bis(4-methoxyphenyl)-4-phenylthiopyrylium Fluoroborate          
 APTP: 4(4-Dimethylaminophenyl)-2,6-diphenylthiopyrylium Perchlorate      
 BPPA: 4(4-Butoxyphenyl)-2,6-diphenylpyrylium Fluoroantimonate            
 
    
     Examples 11 to 20 
     Each of the compositions, as set forth in Table 2, was prepared by dissolving the light polymerization initiator in the ethylenic unsaturated compound to prepare a dental composition. The composition was filled in a polyethylene cylinder having an inner diameter of 10 mm and a depth of 10 mm, and exposed to light ray irradiation from a halogen lamp (15 volts, 150 watts) placed above the cylinder by 3 mm, while filtering off the light rays having wavelengths of less than 350 nm, to be polymerized and cured. The depth of curing of each composition was measured using a micrometer after the polymerized and cured mass was recovered from the cylinder and the unreacted material was removed therefrom. The results are shown in Table 2. 
     Examples 21 and 22 
     Each of the compositions, as set forth in Table 2, was prepared by dissolving the light polymerization initiator uniformly in the ethylenic unsaturated compound, followed by adding a silica gel base filler (AEROSIL R 972 produced by Aerosil Nippon K.K.), and then kneaded by twin rollers to obtain a dental composition. The depth of curing was measured generally following the procedures as conducted in Examples 11 to 20. The results are shown in Table 2. 
     As should be appreciated from the results set forth in Table 2, the dental compositions of the invention were cured deep in the interior region (to have a depth of curing of not less than 5 mm) by exposure to lights deprived of those having the wavelengths of less than 350 nm for a short time period of about 30 to 60 seconds to be adapted for use as excellent teeth crown materials, denture base materials, dental cementing repair materials, caries-preventive materials and dental impression materials while being improved in handling ease in clinical operation and having good appearance without coloring. 
     Comparative Examples 2 and 3 
     Similar tests, as in Examples 11 to 20, were conducted while using triethyleneglycol dimethacrylate as the ethylenic unsaturated compound which was added with the polymerization initiators as set forth in Table 3. 
     As will be seen from the results set forth in Table 3, the compositions containing conventional light polymerization initiators sensitive to ultraviolet rays are not curable even when they are exposed to light rays deprived of the light fractions having the wavelengths of less than 350 nm. 
     
                                           TABLE 2                                 
__________________________________________________________________________
Ethylenic Unsaturated                                                     
                   Light Polymeri-  Exposure                              
                                         Depth of                         
Compound*.sup.1    zation Initiator*.sup.2                                
                             Filler Time Curing                           
                                              Color of                    
(part by wt.)      (part by wt.)                                          
                             (part by wt.)                                
                                    (sec)                                 
                                         (mm) Cured Mass                  
__________________________________________________________________________
Example 11                                                                
      3G 100       TBB 1.0   --     30   5.0  colorless                   
Example 12                                                                
      3G 100       TAB 1.0   --     40   6.0  colorless                   
Example 13                                                                
      3G 100       THB 1.0   --     50   6.5  colorless                   
Example 14                                                                
      3G 100       TOB 1.0   --     60   7.1  colorless                   
Example 15                                                                
      3G 100       TCB 1.5   --     40   5.5  colorless                   
Example 16                                                                
      3G 100       TIB 2.0   --     40   5.8  colorless                   
Example 17                                                                
      3G 50 &amp; bis-MEPP 50                                                 
                   TBB 1.0 &amp; THB 0.2                                      
                             --     30   5.1  colorless                   
Example 18                                                                
      HMDA 50 &amp; UDMA 50                                                   
                   TBB 1.0 &amp; CBP 0.1                                      
                             --     40   6.1  colorless                   
Example 19                                                                
      TMM-3M 50 &amp; HDMP 50                                                 
                   TBB 1.0 &amp; CHP 0.1                                      
                             --     50   6.6  colorless                   
Example 20                                                                
      3G 50 &amp; bis-GMA 50                                                  
                   TBB 0.5   --     60   7.2  colorless                   
Example 21                                                                
      3G 25 &amp; bis-GMA 25                                                  
                   TBB 1.5   40     60   6.5  colorless                   
Example 22                                                                
      3G 20 &amp; bis-GMA 30                                                  
                   TBB 1.5   50     60   6.4  colorless                   
__________________________________________________________________________
 Note:                                                                    
 *.sup.1 bisMEPP: 2,2Bis(4-methacryloxyethoxyphenyl)propane               
 TMM3M: Tetramethylolmethane Trimethacrylate                              
 The other abridged notations are the same as noted in the Note of Table 1
 *.sup.2 TBB: 3,3&#39;,4,4Tetra-(t-butylperoxycarbonyl)benzophenone           
 TAB: 3,3&#39;,4,4Tetra-(t-amylperoxycarbonyl)benzophenone                    
 THB: 3,3&#39;,4,4Tetra-(t-hexylperoxycarbonyl)benzophenone                   
 TOB: 3,3&#39;,4,4Tetra-(t-octylperoxycarbonyl)benzophenone                   
 TCB: 3,3&#39;,4,4Tetra-(cumylperoxycarbonyl)benzophenone                     
 TIB: 3,3&#39;,4,4Tetra-(p-isopropylcumylperoxycarbonyl)benzophenone          
 CBP: 3,3Dicarboxy-4,4di(t-butylperoxycarbonyl)benzophenone               
 CHP: 3,3Dicarboxy-4,4di(t-hexylperoxycarbonyl)benzophenone               
 
    
     
                                           TABLE 3                                 
__________________________________________________________________________
            Ethylenic Unsaturated                                         
                       Light Polymerization                               
                                  Exposure                                
                                       Depth of                           
            Compound   Initiator  Time Curing                             
            (part by wt.)                                                 
                       (part by wt.)                                      
                                  (sec)                                   
                                       (mm)                               
__________________________________________________________________________
Comparative Example 2                                                     
            3G 100     BF* 1.0    60   0                                  
Comparative Example 3                                                     
            3G 100     BIE** 1.0  60   0                                  
__________________________________________________________________________
 Note:                                                                    
 *BF: Benzophenone                                                        
 **BIE: Benzoinisobutyl Ether                                             
 The other abridged notations are the same as noted in the Note of Table 1
                                                                          
 
    
     Examples 23 to 34 
     Each of the compositions, as set forth in Table 4, was prepared by dissolving the α-diketone and the polyperoxy ester containing a benzophenone group uniformly in the ethylenic unsaturated compound. The composition was filled in a polyethylene cylinder having an inner diameter of 10 mm and a depth of 10 mm, and exposed to visible light ray irradiation from a halogen lamp (15 volts, 150 watts) placed above the cylinder by 3 mm to be polymerized and cured. In order to learn the precise effect of irradiated light wavelength, the top of the cylinder filled with the composition was covered with a color glass filter through which the visible light rays from the halogen lamp was irradiated. The used color glass filters were Y-43 and Y-47 (produced by Toshiba Co., Ltd.) which had, respectively, the limit transmission wavelengths of 430 nm and 470 nm. The light intensity passing through the color glass filter was reduced to about one half to one third of the intensity of light emitted from the lamp. The depth of curing of each composition was measured using a micrometer after the polymerized and cured mass was recovered from the cylinder and the unreacted material was removed therefrom. The results are shown in Table 4. 
     As should be appreciated from the results set forth in Table 4, the dental compositions of the invention were cured deep in the interior region (to have a depth of curing of not less than 5 mm) by exposure to visible light for a short time period of about 20 to 40 seconds. It should be also apparent from the results irradiated by light rays passing through color glass filters that the compositions of the invention can be effectively cured by extremely safe light rays having the wavelengths of not less than 470 nm although the intensity of light rays passing through the filters is lowered to one half to one third of the light intensity originally emitted from the lamp. As will be understood from the foregoing, the dental compositions prepared in accordance with the present invention have superior properties when used as teeth crown materials, denture base materials, dental cementing repair materials and dental impression materials while being improved in handling ease and safety in clinical operation. 
     Comparative Examples 4 to 7 
     Each test sample was prepared by mixing the components in the ratio as set forth in Table 5, and subjected to tests conducted similarly as in the preceding Examples. As will be seen from the results shown in Table 5, a composition merely containing an α-diketone or containing a combination of an α-diketones with an ordinary organic peroxide cannot be cured by visible light rays to a satisfactory curing level. 
     
                                           TABLE 4                                 
__________________________________________________________________________
Ethylenic Unsaturated       Peroxy    Exposure                            
                                           Depth of                       
Compound*.sup.1    α-Diketone*.sup.2                                
                            Ester*.sup.3                                  
                                      Time Curing                         
                                                Color Glass               
(part by wt.)      (part by wt.)                                          
                            (part by wt.)                                 
                                      (sec)                               
                                           (mm) Filter                    
__________________________________________________________________________
Example 23                                                                
      3G 100       KQ 1.0   TBB 1.0   30   7.3  None                      
Example 24                                                                
      3G 100       KQ 1.0   TBB 1.0   40   4.6  Y-43                      
Example 25                                                                
      3G 50 &amp; bis-GMA 50                                                  
                   PQ 0.1 &amp; KQ 1.0                                        
                            TBB 1.0 &amp; TAB 0.5                             
                                      20   5.5  None                      
Example 26                                                                
      3G 50 &amp; bis-GMA 50                                                  
                   PQ 0.1 &amp; KQ 1.0                                        
                            TBB 1.0 &amp; TAB 0.5                             
                                      40   5.0  Y-47                      
Example 27                                                                
      bis-GMA 50 &amp; UDMA 50                                                
                   KQ 2.0   TBB 1.0 &amp; THB 0.2                             
                                      30   5.4  None                      
Example 28                                                                
      bis-GMA 50 &amp; UDMA 50                                                
                   KQ 2.0   TBB 1.0 &amp; THB 0.2                             
                                      40   4.0  Y-47                      
Example 29                                                                
      bis-GMA 50 &amp; HMDA 50                                                
                   AQ 0.1 &amp; KQ 0.5                                        
                            TBB 1.0 &amp; TOB 1.0                             
                                      30   7.3  None                      
Example 30                                                                
      bis-GMA 50 &amp; HMDA 50                                                
                   AQ 0.1 &amp; KQ 0.5                                        
                            TBB 1.0 &amp; TOB 1.0                             
                                      40   4.5  Y-43                      
Example 31                                                                
      3G 50 &amp; HDMP 50                                                     
                   KQ 1.5   TBB 0.5 &amp; TCB 0.5                             
                                      30   5.8  None                      
Example 32                                                                
      3G 50 &amp; HDMP 50                                                     
                   KQ 1.5   TBB 0.5 &amp; TCB 0.5                             
                                      40   4.2  Y-47                      
Example 33                                                                
      3G 100       BQ 0.1 &amp; KQ 0.7                                        
                            TBB 0.5 &amp; TIB 0.1                             
                                      25   6.5  None                      
Example 34                                                                
      3G 100       BQ 0.1 &amp; KQ 0.7                                        
                            TBB 0.5 &amp; TIB 0.1                             
                                      40   4.5  Y-43                      
__________________________________________________________________________
 Note:                                                                    
 *.sup.1 All of the abridged notations are the same as noted in the Note o
 Table 1.                                                                 
 *.sup.2 KQ: Camphorquinone                                               
 PQ: 9,10Phenanthrenequinone                                              
 AQ: Acenaphthenequinone                                                  
 BQ: Naphtoquinone                                                        
 *.sup.3 All of the abridged notations are the same as noted in the Note o
 Table 1.                                                                 
 
    
     
                                           TABLE 5                                 
__________________________________________________________________________
            Ethylenic Unsaturated                                         
                       Light Polymerization                               
                                  Exposure                                
                                       Depth of                           
            Compound   Initiator  Time Curing                             
                                            Color Glass                   
            (part by wt.)                                                 
                       (part by wt.)                                      
                                  (sec)                                   
                                       (mm) Filter                        
__________________________________________________________________________
Comparative Example 4                                                     
            3G 100     KQ 1.0     40   0    Y-43                          
Comparative Example 5                                                     
            3G 100     KQ 1.0 &amp; TBP* 1.0                                  
                                  40   0    Y-43                          
Comparative Example 6                                                     
            3G 100     KQ 1.0     20   0.2  None                          
Comparative Example 7                                                     
            3G 100     KQ 1.0 &amp; TBP* 1.0                                  
                                  30   0.5  None                          
__________________________________________________________________________
 Note: *TBP: tButylperoxybenzoate                                         
 
    
     Example 35 
     Preparation of High Polymer Surface Active Agent 
     Each of the copolymers (high polymer surface active agents) having the compositions as set froth in Table 6 was synthesized by an ordinary solution polymerization process while using benzene as the solvent and 2,2&#39;-azobisisobutylonitrile as the polymerization initiator. Each copolymer was precipitated in petroleum ether to obtain a solid copolymer. The weight average molecular weights of respective copolymers were determined by the GPC method. The results are shown in Table 6. 
     Preparation of Paste 
     Each of the light polymerization initiators and the copolymers, as set forth in Table 7, was dissolved in each mixture of ethylenic unsaturated compound to prepare a solution. The solution was charged in a kneader and slowly added with fine particles of an inorganic filler, and the admixture was kneaded at atmospheric pressure for 2 hours. The admixture was kneaded under a reduced pressure of lower than 20 mmHg for additional 2 hours to be defoamed, whereby a dental composition paste of the present invention was prepared. 
     Test 
     Each of the pastes having the compositions as set forth in Table 7 was irradiated by a projector including four halogen lamps (150 watts) for a pre-set time period to obtain a cured product. The tackiness of the surface of the molded paste was observed by a finger touch test. The bending strength of each cured product was measured by the method which will be described in detail hereinbelow. 
     Method for the Determination of Bending Strength 
     A cellophane sheet was laid over a stainless steel mold, and a paste was charged and pressed on the cellophane sheet. The top face of the paste was covered by another cellophane sheet, and then a slide glass plate was put thereon under a pressure to flatten the surface so that the molded paste had even side faces. Thereafter, the slide glass plate was removed, and the paste was exposed to irradiation of lights from the top face thereof for 2 minutes to be cured sufficiently. The cured product or resin was put out of the mold, and machined to form a test piece having a length of 60 mm, a width of 10 mm and a thickness of 2.5 mm. The test piece was aged for 24 hours after the light polymerization, and then subjected to bending test. The span between the fulcra carrying the test piece was set to 50 mm, and the bending strength of the test piece was measured at a cross-head speed of 2 mm/min using a bending tester attached to an autograph. The bending strength was calculated from the following equation of: ##EQU1## wherein F is the maximum stress applied to the test piece, I is the distance between the fulcra, b is the width of the test piece, and d is the thickness of the test piece. 
     Bending strengths of five test pieces for each cured resin were measured and the average value thereof was calculted. The results are shown in Table 7. 
     
                                           TABLE 6                                 
__________________________________________________________________________
                                 Mixing Weight Average                    
Copolymer                                                                 
      Composition                Ratio (wt %)                             
                                        Molecular Weight                  
__________________________________________________________________________
A     Methoxyethyl Methacrylate  5      113,000                           
      Methoxydiethyleneglycol Monomethacrylate                            
                                 60                                       
      Methyl Methacrylate        35                                       
B     Methoxytetraethyleneglycol Monomethacrylate                         
                                 50     152,000                           
      Methyl Methacrylate        45                                       
      Ethyl Acrylate             5                                        
C     Methoxytetraethyleneglycol Monomethacrylate                         
                                 45     108,000                           
      Phenoxytetraethyleneglycol Monoacrylate                             
                                 5                                        
      Methyl Methacrylate        50                                       
D     Isobutoxytriethyleneglycol Monomethacrylate 5                       
                                 120,000                                  
      Methoxypolyethyleneglycol Monomethacrylate (n = 9)                  
                                 25                                       
      Methyl Methacrylate        70                                       
__________________________________________________________________________
 
    
     
                                           TABLE 7                                 
__________________________________________________________________________
                                 Light Poly-                              
     Unsaturated                                                          
              Fine Particles of  merization Bending                       
Ex. 35                                                                    
     Compound*.sup.1                                                      
              Inorganic Filler*.sup.2                                     
                        Copolymer                                         
                                 Initiator*.sup.3                         
                                            Strength                      
Run No.                                                                   
     (part by weight)                                                     
              (part by weight)                                            
                        (part by weight)                                  
                                 (part by weight)                         
                                            (kg/cm.sup.2)                 
                                                  Tackiness               
__________________________________________________________________________
1    3G 34    S-1 30    A 2      TBB 0.6    1110 ± 50                  
                                                  No                      
     MPEPP 34                    BMTF 0.006                               
2    3G 30    S-1 38    B 2      TBB 0.6    1010 ± 80                  
                                                  No                      
     MPEPP 30                    BMTF 0.006                               
3    3G 35    S-1 25    C 5      TBB 0.6    1150 ± 90                  
                                                  No                      
     MPEPP 35                    Camphorquinone 0.06                      
4    3G 34    S-2 30    D 2      TBB 0.6    1080 ± 50                  
                                                  No                      
     MPEPP 34                    Camphorquinone 0.06                      
5    3G 34    S-2 30    A 2      TBB 0.6    1220 ± 130                 
                                                  No                      
     MPEPP 34                    BMTF 0.006                               
__________________________________________________________________________
 Note:                                                                    
 *.sup.1 3G: Triethyleneglycol Dimethacrylate                             
 MPEPP: 2,2Bis(4-methacryloxydiethoxyphenyl)propane                       
 *.sup.2 S1: Silica treated with dimethyldicholorosilane and having an    
 average particle size of 20 millimicrons.                                
 S2: Silica treated with hexamethyldisilazane and having an average       
 particle size of 15 millimicrons.                                        
 *.sup.3 TBB: 3,3&#39;,4,4Tetra-(t-butylperoxycarbonyl)benzophenone           
 BMTF: 4(4-Butoxyphenyl)-2,6-bis(4-methoxyphenyl)thiopyrylium Fluoroborate
 
    
     Although the present invention has been described with reference to the specific examples, it should be understood that various modifications and variations can be easily made by those skilled in the art without departing from the spirit of the invention. Accordingly, the foregoing disclosure should be interpreted as illustrative only and not to be interpreted in a limiting sense. The present invention is limited only by the scope of the following claims.