fig1 through 4 are skeletal views of the mandible in various vertical positions . fig1 shows a partial loss where the distal drive of the condyle 2 is into the back wall of the glenoid fossa 4 . in fig2 a total loss of vertical position is shown where the condyle 2 has been driven into the back wall 4 of the glenoid fossa and which can cause erosion of the condyle head . fig3 shows a position where the condyle 2 is too far back and up into the glenoid fossa 4 . fig4 shows the mandible 6 in a relaxed neuromusclar or neuromuscular centric ™ position where the vertical measurement from the normal crest of the gingival of the upper central incisor to the crest of the gingival of the lower central incisor is approximately 19 mm . all orthotics , repositioners and sports splints should be made to this terminal position . in the diagnosis of skeletal relation of the mandible to the skull a registration is taken by the dentist and transferred to the articulator . the mounting thus becomes a diagnostic tool . when the dentist makes a clinical judgement , a splint with accurate occlusion can be made on that mounting . if the procedure is one of full mouth reconstruction , once all the teeth have been prepared a acrylic registration of the patient is taken to the neuromuscular centric position ( fig4 ) with a bio - tens ™ and the registration is mounted on the articulator . the lab technician can now follow the neuromuscular technique and construct the occlusion to the neuromuscular position . with an edentulous patient , an acrylic registration is taken to the neuromuscular centric position of fig4 using a bio - tens ™. the cases are then mounted on the articulator and a 20 ° mounting plate then indicates to the technician where to set the teeth . clinical and lab procedures for complete mouth reconstruction , complete dentures and splint construction to the neuromuscular position are simple and uncomplicated using the articulator of the invention . in order to relax the muscles of mastication , a gentle pulsating stimula is applied to the patient &# 39 ; s skin for approximately one hour using the above mentioned bio - tens ™. the muscles become relaxed and their trajectory can be traced on the mandibular kinesiograph . this enables the dentist to diagnose the incorrect or abnormal relationship between the mandible to the maxillary process . fig5 and 6 show the articulator 10 in assembled condition and fig7 through 13 show the structural details thereof . referring to fig7 and 8 , the spine post 12 is preferably formed of a rigid light metal such as aluminum and has an elongated straight body 14 with a bore 16 through the upper end thereof , a plastic bushing 18 being located in a countersunk portion 20 of the upper end . a guide rail 22 is provided along one side of the post 12 and comprises parallel channels 24 of rectangular configuration which , together with the adjacent terminal side edge 26 of the post 12 , combine to form the guide 22 of &# 34 ; t &# 34 ; shape in cross section as seen in fig8 . this cross section provides a plurality of guide surfaces for the reception thereon of the adaptor 28 , fig9 which has complimentary surfaces 30 to those of the guide rail 22 and which carries the 20 ° mounting plate 32 . the upper mounting plate 34 of the articulator 10 is illustrated in fig1 and 11 . the lower mounting plate or base 35 , fig5 is of the same construction . plate 34 is formed of rigid aluminum of substantial thickness and includes a planar portion 36 and hinge shoulders 38 which are align bored at 40 . a rectangular spacing 42 between the shoulders is provided so that the upper end of the spine post 12 is received therein , and a steel hinge pin 44 , fig6 pivotally interconnects plate 36 and post 12 by aligning and being located in bore 40 of the plate and bore 16 of the post . as seen in fig1 , the upper mounting plate 36 can be pivoted back so that it clears the upper end of the post 12 . the posterior remount screw 46 is located so as to increase or decrease the vertical location of a maxillary model to or from the 19 mm guide point . the lower mounting plate 35 is secured to the lower end of the spine post by steel locating pins 48 and 50 which enter bores provided in the lower end of the post 12 , fig7 . fig1 shows the c . k . g .™ inner mounting plate 48 which comprises a central channel 50 which snugly fits over the top of the spine post 12 ( fig1 ) and having an aperture 52 for receiving a locating pin . plate 48 has a pair of l - shaped wings 54 extending outwardly and downwardly from the channel 50 to provide horizontal and vertical marking surfaces 56 and 58 respectively , fig1 - 16 . the c . k . g .™ outer mounting plate 60 is shown in fig1 and , like other elements of the articulator , it is formed of aluminum of substantial thickness and strength . a central , planar portion 62 is bored and threaded at 64 to receive a mounting screw ( not shown ) for attaching a mounting stone and maxillary model thereto as shown in fig1 . like the inner mounting plate 48 , plate 60 has a pair of l - shaped wings 66 which provide horizontal and vertical surfaces 68 , 70 respectively corresponding to like surfaces on the inner mounting plate 48 . the surfaces 68 and 70 are provided with plastic bushings 72 for the reception of steel marking pins 74 , fig1 . referring to fig1 and 15 white tape or screens 76 , 78 are applied to the vertical and horizontal surfaces of the inner mounting plate as shown in fig1 . as explained hereafter , these screens are used to indicate to the dentist the differences between the centric occlusion point and the neuromuscular centric ™ point in both horizontal and vertical planes in the condylar - glenoid fossa area . initially a transcranial x - ray is taken of the patient and a bio - tens ™ is used to bring the patient &# 39 ; s jaw into its relaxed neuromuscular position . a denar slideomatic facebow transfer is then used on the articulator to establish the relationship of the maxillary dentition to the horizontal reference plane so that the maxillary case can be mounted on the articulator in the correct anatomical position . the slidematic facebow provides a fast , easy and extremely accurate means of transferring the proper anatomical relationship to the articulator . the upper model is mounted on the upper mounting plate 34 using snow white stone and the mounting screw 45 . the dentist hand - occludes the lower to the upper and mounts the lower model to the lower plate of the articulator , measuring the vertical with calipers . if there is an overclosure of 3 or more millimeters the articulator is opened with remount pin to 17 mm , the measurement of the normal crest of the gingiva of the upper central to the normal crest of the gingiva of the lower central . a wafer is made using acrylic , a rolled acrylic wafer being placed on the lower teeth thereby taking up the empty space between the upper and lower models . the magnet of the m . k . g .™ is placed on the patient and readings are taken with the m . k . g .™. the lower model is removed from the white stone and spaces between teeth and under cuts are filled with blocking compound . the splint is pulled and cut out . the lower model is then re - mounted using the arcylic bite , the dentist builds the splint and checks the bite with articulating paper . as shown in fig1 - 18 the inner myocheck mounting plate 48 is mounted atop the spine post 12 and tape screens 76 , 78 are adhesively applied to the wing surfaces 56 , 58 . with the teeth of the models in occlusion , the marking pins are used ( fig1 ) to mark centric occlusion points on the screens 76 , 78 of the inner plate 48 . subsequently the acrylic bite block is mounted between the models and neuromuscular centric ™ points are marked on the screens 76 , 78 of the inner mounting plate . the distance between the markings indicating to the dentist the increase in the extra capsular space from centric occlusion to neuromuscular centric ™, condyle to top wall , on the vertical screen and the increase in the extra capsular space from centric occlusion to neuromuscular centric ™, condyle to back wall , on the horizontal screen as shown in fig1 a . fig1 illustrates the articulator with the neuromuscular centric ™ post p in place , the post p being used in preventing any increase in the vertical during setting of a mounting stone or in the fabrication of appliances on the articulator . while the invention has been described in connection with a specific embodiment thereof and in a specific use , various modifications thereof will occur to those skilled in the art without departing from the spirit and scope of the invention as set forth in the appended claims . the terms and expressions which have been employed in this specification are used as terms of description and not of limitation , and there is no intention in the use of such terms and expressions to exclude any equivalents of the features shown and described or portions thereof , but it is recognized that various modifications are possible within the scope of the invention claimed .
a rigid , non - yielding precision dental articulator instrument for preserving and making available the occlusion plane required to build accurate incuspation of teeth . the device provides initial mounting of maxillary models using a facebow . a 20 degree sliding mounting plate is also provided for aiding in the setting of the occlusal plane .