Ion release mechanisms in composites containing CaP particles and hydrophilic monomers.

Objective: To investigate the effect of hydrophilic/permeable polymer matrices on water sorption/solubility (WS/SL), Ca release, mechanical properties and hydrolytic degradation of composites containing dicalcium phosphate dihydrate (DCPD) particles.

Methods: Six composites were tested, all with 10 vol% of glass particles and either 30 vol% or 40 vol% DCPD. Composites containing 1BisGMA:1TEGDMA in mols (at both inorganic levels) were considered controls.

Compositional boundaries for functional dental composites containing calcium orthophosphate particles.

Objectives: To investigate the interrelationships among handling, degree of conversion (DC), mechanical behavior and Ca release of composites containing dicalcium phosphate dihydrate (DCPD, CaHPO.2HO), as a function of total inorganic content and DCPD: glass ratio.

Methods: Twenty-one formulations (1 BisGMA: 1 TEGDMA, in mols) with inorganic fractions ranging from zero to 50 vol% and different DCPD: glass ratios were evaluated for viscosity (parallel plate rheometer, n = 3), DC (near-FTIR spectroscopy, n = 3), fracture toughness/K (single-edge notched beam, n = 7-11) and 14-day Ca release (inductively coupled plasma optical emission spectroscopy, n = 3).