Effect of calcium orthophosphate particle size and CaP:glass ratio on optical, mechanical and physicochemical characteristics of experimental composites

Autor(es)

Trinca, Rafael Bergamo ; Oliveira, Beatriz Almeida ; Vilela, Handially dos Santos ; Braga, Roberto Ruggiero

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 39, n. 9, p. 9-pg., 2023-08-23.

Resumo

Objective: Evaluate light transmittance (%T), color change (Delta E), degree of conversion (DC), bottom-to-top Knoop microhardness (KHN), flexural strength (BFS) and modulus (FM), water sorption/solubility (WS/SL) and calcium release of resin composites containing different dicalcium phosphate dihydrate (DCPD)-to-barium glass ratios (DCPD:BG) and DCPD particle sizes. Methods: Ten resin-based composites (50 vol% inorganic fraction) were prepared using BG (0.4 mu m) and DCPD particles (12 mu m, 3 mu m or mixture) with DCPD:BG of 1:3, 1:1 or 3:1. A composite without DCPD was used as a control. DC, KHN, %T and Delta E were determined in 2-mm thick specimens. BFS and FM were determined after 24 h. WS/SL was determined after 7 d. Calcium release was determined by coupled plasma optical emission spectroscopy. Data were analyzed by ANOVA/Tukey test (alpha: 0.05). Results: %T was significantly reduced in composites with milled, compared to pristine DCPD (p < 0.001). Delta E > 3.3 were observed with DCPD:BG of 1:1 and 3:1 formulated with milled DCPD (p < 0.001). DC increased at 1:1 and 3:1 DCPD:BG (p < 0.001). All composites presented bottom-to-top KHN of at least 0.8. BFS was not affected by DCPD size but was strongly dependent on DCPD:BG (p < 0.001). Reductions in FM were observed with milled DCPD (p < 0.001). WS/SL increased with DCPD:BG (p < 0.001). At 3DCPD: 1BG, using small DCPD particles led to a 35 % increase in calcium release (p < 0.001). Significance: A trade-off between strength and Ca2+ release was observed. In spite of its low strength, the formulation containing 3 DCPD: 1 glass and milled DCPD particles is preferred due to its superior Ca2+ release. (AU)

• Processo FAPESP: 19/04737-4 - Remineralização dentinária com o uso de um compósito contendo partículas de ortofosfato de cálcio associado a um precursor mineral em fase líquida (Polymer-Induced Liquid-Precursor, PILP): desenvolvimento de material, estudos in vitro e clínico aleatorizado
• Beneficiário: Roberto Ruggiero Braga
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 20/12761-0 - Análise in vitro da remineralização dentinária com o uso de cimento de ionômero de vidro com ou sem partículas de ortofosfato de cálcio ou com agregado de trióxido mineral
• Beneficiário: Handially dos Santos Vilela
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 20/13983-6 - Efeito da temperatura, pH e concentração de precursores na síntese de partículas de DCPD e sua aplicação em um compósito resinoso remineralizante
• Beneficiário: Rafael Bergamo Trinca
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado