Abstract
Dental composite resins are the main direct tooth restorative materials. The recent research and development on dental composite resins focused on developing materials with adequate strength, high wear resistance and low shrinkage. Polymerization shrinkage and its accompanied stress may destroy the interfacial bonds between composite and tooth and lead to recurrent caries. In this paper, novel light-curable composite resins with calcium phosphate silicate cement (CPSC) added to the filler phase were formulated. CPSC was synthesized with tricalcium silicate (C3S) and calcium phosphate monobasic (CPM). C3S hydrates to produce calcium silicate hydrate (C-S-H) gel and calcium hydroxide (CH) which accompanied volume expansion. CPM reacts with the CH to precipitate hydroxyapatite (HAP) in situ within C-SH which can largely remove CH. Microstructures of composite resins were characterized by SEM and XRD. Chemicalphysical properties were evaluated include volume change, flexural strength, hardness and elastic modulus. The results showed that shrinkage of dental composite resins with CPSC added to the filler phase could be compensated and reduced effectively.
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