Chemical interaction between hydroxyapatite and functional phosphoric acid ester monomers

Abstract

We examined the chemical interaction of 10-MDP and a hydroxyapatite (HAp) particle used for a self-etching system by various structural analysis techniques. In early period of reaction, 10-MDP chemisorbed on the calcium sites of the HAp surface. The 10-MDP monomers reacted with calcium ions dissolved from HAp due to the decalcification function of a 10-MDP monomer and resulted in the deposition of calcium salt (MDPCa) of 10-MDP on HAp. As reaction advances, calcium hydrogenphosphate dihydrate (DCPD) also deposited on the MDPCa. The dissolution (decalcification) of HAp by a 10-MDP monomer and the deposition of calcium salts were caused on the HAp surface.