Adhesion of carboxylate cements to hydroxyapatite. I. The effect of the structure of aliphatic carboxylates on their uptake by hydroxyapatite.
An investigation was made into the effect of the structure and functionality of aliphatic carboxylates on their sorption onto hydroxyapatite with a view to ascertaining factors affecting the adhesion of polyacrylate cements to tooth materials. In general, the amount of carboxylate sorbed was found to increase with the number of groups contained in the molecule. Thus, polyacrylate was found to be much more strongly sorbed than low molecular weight species. Sorption of the low molecular weight species appeared to be related to stereochemical factors rather than to the stability constants of their calcium chelates.
Adhesion of carboxylate cements to hydroxyapatite. III. Adsorption of poly(alkenoic acids).
Investigations into the effects of relative molecular mass (RMM) and structure of poly(alkenoic acid)s on their adsorption on to hydroxyapatite (HAP) were carried out with a view to establishing factors that influence the adhesion of glass-poly(alkenoic acid) cements to tooth material. The effects of pH and fluoride addition were also studied. It was found that high adsorption levels were achieved under conditions of high chain entanglement, such as in a concentrated solution of a polyacid of high RMM. Theories of adsorption of carboxylic acids on to HAP are reviewed in the light of these studies and previous work at our laboratory.
An infra-red spectroscopic study of cement formation between metal oxides and aqueous solutions of poly(acrylic acid)
An infra-red spectroscopic study of the formation of cements between metal oxides and aqueous solutions of poly (acrylic acid) is reported. Oxides of divalent metals form cement gels more readily than oxides of trivalent metals. An attempt was made to gain structural information from the observed frequency shifts of the absorption bands of the carboxylate groups in the metal poly(acrylate) gels relative to those recorded for the purely ionic form. The form of cation binding to the polyanion chain is discussed.