title: Resin composite characterizations following a simplified protocol of accelerated aging as a function of the expiration date.
abstract: This study evaluated the mechanical, thermal, and morphological characteristics of different classifications of dental composites as a function of the material condition (new, aged and expired). Specimens were obtained according to these factors: Composites: Filtek P60, Filtek Z250, Filtek Z350XT, and Filtek Silorane; and Material conditions: new, aged, and expired. The syringe composites underwent an accelerated aging protocol (Arrhenius model). The flexural strength (FS) and flexural modulus (E) were obtained. The thermogravimetric analysis (TGA) and differential thermal analysis (DTA) were also performed and the glass transition temperature (Tg) and the weight loss calculated. Topographic analysis of the composites was performed under SEM. The material conditions influenced the mechanical properties of the composites. The silorane composite exhibited a characteristic thermal behavior different from that of the methacrylates. In general, the Tg increased after the accelerated aging protocol and decreased for expired ones, compared to the new composites. A significant increase in FS of Filtek Z350XT after aging was accompanied by an increase in the Tg. The filler packings were in accordance with the manufacture׳s information. The topographic aspects of the composites were modified as a function of the material condition. The mechanical properties of the composites following a simplified protocol of accelerated aging varied as a function of the expiration date. The silorane composite presented a characteristic thermal behavior. Although the dental manufacturers may not be able to control variables as storage temperature and transportation conditions, these effects on the composite clinical performance can be minimized if properly considered.
authors.affiliation: Biomaterials Research Group, School of Dentistry, Anhanguera University of São Paulo (UNIAN-SP), São Paulo, SP, Brazil.
authors.forename: Paulo Henrique Perlatti
authors.initials: PH
authors.lastname: D'Alpino
authors.affiliation: DF-FC, UNESP - Univ Estadual Paulista, POSMAT - Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, Bauru, SP, Brazil.
authors.forename: Marcus Vinícius Gonçalves
authors.initials: MV
authors.lastname: Vismara
authors.affiliation: Biomaterials Research Group, School of Dentistry, Anhanguera University of São Paulo (UNIAN-SP), São Paulo, SP, Brazil.
authors.forename: Luciano Marcelo de Medeiros
authors.initials: LM
authors.lastname: Mello
authors.affiliation: Biomaterials Research Group, School of Dentistry, Anhanguera University of São Paulo (UNIAN-SP), São Paulo, SP, Brazil.
authors.forename: Vinicius
authors.initials: V
authors.lastname: Di Hipólito
authors.affiliation: Biomaterials Research Group, School of Dentistry, Anhanguera University of São Paulo (UNIAN-SP), São Paulo, SP, Brazil.
authors.forename: Alejandra Hortencia Miranda
authors.initials: AH
authors.lastname: González
authors.affiliation: DF-FC, UNESP - Univ Estadual Paulista, POSMAT - Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, Bauru, SP, Brazil. Electronic address: graeff@fc.unesp.br.
authors.forename: Carlos Frederico de Oliveira
authors.initials: CF
authors.lastname: Graeff
mesh_terms: D001672:Biocompatible Materials; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000379:methods; D003799:Dental Stress Analysis; D005898:Glass; D006244:Hardness; D006358:Hot Temperature; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D062047:Silorane Resins / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013818:Thermogravimetry; D013997:Time Factors
chemical_list: D001672:Biocompatible Materials; D003188:Composite Resins; D003764:Dental Materials; C444701:Filtek Z250; D008689:Methacrylates; D062047:Silorane Resins; C555513:silorane composite resin
keywords: Accelerated aging; Composite resins; Mechanical properties; Methacrylate; Silorane; Thermal analysis