title: Effect of thermo-mechanical load cycling on silorane-based composite restorations.
abstract: The aim of this study was to compare the formation of marginal gaps after thermo-mechanical load cycling, between siloranebased and methacrylate-based restorations. Standardized class II cavities were made in 10 permanent human third molars that were restored with the adhesive system Clearfil SE Bond+composite Filtek Z-350 (Methacrylates) and with the composite bonding Filtek P90+P90 (Siloranes), respectively. After 24 h of storage in 100% humidity at 37°C, the restoration margins were stained, photographed, and evaluated. The gap length was calculated as the percentage of the total length of the margins. Thereafter, the specimens were tested by a thermo-mechanical machine and the marginal gap formation of the specimens was re-evaluated. The results were expressed as percentages of gaps and were submitted to a Mann Whitney test at 5% level of significance. Methacrylates showed a statistically significant higher percentage of gaps than Siloranes, both before and after cycling.
authors.affiliation: Department of Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Al. Octávio Pinheiro Brisola, 9-75, 17012-901, Bauru, SP, Brazil. afborges@fob.usp.br
authors.forename: Ana Flavia Sanches
authors.initials: AF
authors.lastname: Borges
authors.forename: Juliete de Sousa
authors.initials: Jde S
authors.lastname: Santos
authors.forename: Carla Muller
authors.initials: CM
authors.lastname: Ramos
authors.forename: Sergio Kiyoshi
authors.initials: SK
authors.lastname: Ishikiriama
authors.forename: Mirela Sanae
authors.initials: MS
authors.lastname: Shinohara
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D058105:Polymerization; D062047:Silorane Resins / Q000737:chemistry
chemical_list: D003188:Composite Resins; D008689:Methacrylates; D062047:Silorane Resins