Improvement on properties of experimental resin cements containing an iodonium salt cured under challenging polymerization conditions

Autor(es)

Palialol, Alan R. ^[1] ; Martins, Caetano P. ^[1] ; Dressano, Diogo ^[1] ; Aguiar, Flavio H. B. ^[1] ; Goncalves, Luciano S. ^[2] ; Marchi, Giselle M. ^[1] ; Pfeifer, Carmem S. ^[3] ; Lima, Adriano F. ^{[4, 5]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Av Limeira 901, Mail Box 52, BR-13414903 Piracicaba, SP - Brazil

^[2] Univ Fed Santa Maria, Sch Dent, Dept Restorat Dent, Av Roraima, 1000 Camobi, BR-97105900 Santa Maria, RS - Brazil

^[3] Oregon Hlth & Sci Univ, Dept Restorat Dent, Biomat & Biomech, Portland, OR 97239 - USA

^[4] Univ Paulista, Dent Div Res, Rua Doutor Bacelar 1212, BR-04026002 Paulista, SP - Brazil

^[5] Univ Paulista, Sch Dent, Dent Res Div, Rua Doutor Bacelar 1212, BR-04026002 Paulista, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 37, n. 10, p. 1569-1575, OCT 2021.
• Citações Web of Science: 0

Resumo

Objective. The use of resin cements in clinical practice entails photopolymerization through prosthetic devices, which precludes light penetration. The objective of this study was to modify experimental resin cements (ERCs) with diphenyliodonium hexafluorophosphate (DPI) in an attempt to improve chemical and mechanical properties of materials cured with reduced irradiance and final radiant exposure. Methods. A co-monomer base containing a 1:1 mass ratio of 2.2-bis{[}4-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (bis-GMA) and triethyleneglycol dimethacrylate (TEGDMA) was prepared, with 1 mol% of camphorquinone and 2 mol% of ethyl 4(dimethylamino)benzoate as initiator system. The resin was divided into 4 fractions according to the DPI concentrations (0, 0.5, 1 and 2 mol%). The challenging polymerization condition was simulated performing the light activation (12, 23 and 46 s) through a ceramic block (3 mm thick). The irradiance was assessed with a calibrated spectrometer (1320 mW/cm(2)), resulting in three levels of radiant exposure (0.58, 1.1 and 2.2 J/cm(2)). The polymerization kinetics was evaluated in real-time using a spectrometer (Near-IR). Water sorption and solubility was analyzed and the cohesive strength of resins obtained through the microtensile test. Polymerization stress was assessed by Bioman method. Results. Resins containing DPI had higher degree of conversion and rate of polymerization than the control (without DPI). The use of DPI reduced water sorption and solubility, and led to higher cohesive strength compared to resins without the iodonium salt. However, the stress of polymerization was higher for experimental resins with DPI. Significance. Even under remarkably reduced irradiance, cements containing a ternary initiating system with an iodonium salt can present an optimal degree of conversion and chemical/mechanical properties. (C) 2021 Published by Elsevier Inc. on behalf of The Academy of Dental Materials. (AU)

• Processo FAPESP: 15/12324-0 - Efeito de diferentes doses de energia nas propriedades físico-químicas de cimentos resinosos experimentais contendo sal de ônio
• Beneficiário: Caetano Polezi Martins
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica