Dental Composites Based on Amorphous Calcium Phosphate Resin Composition/Physicochemical Properties Study
Drago Skrtic, Joseph M. Antonucci
This study explores how the resin composition/structure affects the physicochemical properties of copolymers and their amorphous calcium phosphate (ACP)-filled composites. Unfilled copolymers and composites filled with 40 % by mass zirconia-hybridized ACP were evaluated for biaxial flexure strength (BFS), degree of conversion (DC), mineral ion release, polymerization shrinkage (PS) and water sorption (WS). The average DC values were (82 94) % and (74 91) % for copolymers and composites, respectively. Unrelated to the resin composition, the PS values of composites were up to 8.4 vol. % and the BFS values of wet composite specimens were on average (51 8) MPa.The maximum WS values attained in copolymers and composites reached 4.8 mass %. Inclusion of hydrophobic HmDMA monomer in the matrices significantly reduced the WS. The levels of Ca and PO4 released from all types of composites were significantly above the minimum necessary for the redeposition of apatite to occur. Elevated Ca, and to a lesser extent PO4 release was observed in HEMA-containing, ternary EBPADMA fromulations. Further resin reformulations may be needed to improve the PS of composite specimens. Poor dispersion of as-synthesized ACP within the composite contributes to their inferior mechanical perfomance.
amorphous calcium phosphate, biaxial flexure strength, composite, copolymer, degree of vinyl conversion, ion release, polymerization shrinkage, water sorption
and Antonucci, J.
Dental Composites Based on Amorphous Calcium Phosphate Resin Composition/Physicochemical Properties Study, Journal of Biomedical Materials Applications, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852585
(Accessed June 4, 2023)