Physicochemical characterization of experimental resin-based materials containing calcium orthophosphates or calcium silicate

Autor(es)

Resende, Mariana C. A. ; Vilela, Handially S. ; Chiari, Marina D. S. ; Trinca, Rafael B. ; Silva, Flavia R. O. ; Braga, Roberto R.

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 40, n. 10, p. 8-pg., 2024-09-13.

Resumo

Objective: To evaluate experimental dimethacrylate-based materials containing calcium orthophosphates or calcium silicate particles in terms of their optical, mechanical and Ca2+ release behaviour. Methods: Dicalcium phosphate dihydrate (DCPD), hydroxyapatite (HAp), beta-tricalcium phosphate (beta-TCP) or calcium silicate (CaSi) particles were added to a photocurable BisGMA/TEGDMA resin (1:1 in mols) at a 30 vol% fraction. Materials containing silanized or non-silanized barium glass particles were used as controls. Degree of conversion (DC) at the top and base of 2-mm thick specimens was determined by ATR-FTIR spectroscopy (n = 5). Translucency parameter (TP) and transmittance (%T) were determined using a spectrophotometer (n = 3). Biaxial flexural strength (BFS) and flexural modulus (FM) were determined by biaxial flexural testing after 24 h storage in water (n = 10). Ca2+ release in water was determined during 28 days by inductively coupled plasma optical emission spectrometry (n = 3). Statistical analysis was performed using ANOVA/Tukey test (DC: two-way; TP, %T; BFS and FM: one-way; Ca2+ release: repeated measures two-way, alpha = 5 %). Results: CaSi and beta-TCP particles drastically reduced DC at 2 mm, TP and %T (p < 0.001). Compared to both controls, all Ca2+-releasing materials presented lower BFS (p < 0.001) and only the material with DCPD showed significantly lower FM (p < 0.05). The material containing CaSi presented the highest Ca2+ release, while among materials formulated with calcium orthophosphates the use of DCPD resulted in the highest release (p < 0.001). Significance: CaSi particles allowed the highest Ca2+ release. Notwithstanding, the use of DCPD resulted in a material with the best compromise between optical behaviour, DC, strength and Ca2+ release. (AU)

• Processo FAPESP: 20/05986-5 - Desenvolvimento e aplicação de nanopartículas de silicato de cálcio para remineralização dentinária
• Beneficiário: Marina Damasceno e Souza de Carvalho Chiari
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• 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: 22/08411-9 - Efeito da adição de partículas de silicato de cálcio e ortofosfato de cálcio nas propriedades mecânicas, propriedades ópticas e liberação de cálcio de compósitos restauradores experimentais
• Beneficiário: Mariana Carolayne Almeida Resende
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica