Autor(es):
Cunha, Leonardo Goncalves ; Bruschi Alonso, Roberta Caroline ; de Souza, Eduardo Jos Carvalho, Jr. ; Elias Claro Neves, Ana Christina ; Correr-Sobrinho, Lourenco ; Sinhoreti, Mário Alexandre Coelho
Data: 2019
Origem: Oasisbr
Assunto(s): Composite Resins; Stress; Post-Curing; Modulated Photoactivation Methods; Contraction Stress; Light-Intensity; Restorative Composites; Plasma-Arc; Conversion; Dentistry, Oral Surgery & Medicine; Dentistry, Oral Surgery & Medicine; Composite Resins; Composite Resins; Stress; Stress; Post-Curing; Post-Curing; Modulated Photoactivation Methods; Modulated Photoactivation Methods; Contraction Stress; Contraction Stress; Light-Intensity; Light-Intensity; Restorative Composites; Restorative Composites; Plasma-Arc; Plasma-Arc; Conversion; Conversion; Dentistry, Oral Surgery & Medicine; Dentistry, Oral Surgery & Medicine; Dentistry, Oral Surgery & Medicine; Dentistry, Oral Surgery & Medicine
Descrição
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The aim of this study was to evaluate the effect of different curing methods on the stress generated by the polymerization shrinkage of a restorative composite in two moments: immediately after light exposure and after 5 min. Photoactivation was performed using two different light sources: (1) xenon plasma are (PAC) light (1,500 mW/cm(2) - 3s) and (2) a quartz- tungsten-halogen (QTH) light with three light-curing regimens: continuous exposure (40 s at 800 mW/cm(2) - CL); soft-start (10 s at 150 mW/cm(2) and 30 s at 800 mW/cm(2) - SS) and intermittent light [cycles of 4 s (2 s with light on at 600 mW/cm(2) and 2 s of light off), for 80s - IL]. The composite resin was applied between two 5-mm diameter metallic rods, mounted in a servohydraulic machine. The maximum stress was recorded immediately after light exposure (FF) and after 5 min (5F). The results were submitted to ANOVA and Tukey's test (5%). For each method, the results obtained in FF and 5F were, respectively: CL (3.58 and 4.46 MPa); SS (2.99 and 4.36 MPa); IL (3.11 and 4.32 MPa) and PAC (0.72 and 3.27 MPa). The stress generated by the polymerization shrinkage during light exposure can be associated with the photoactivation method used. A significant increase in the stress level was observed during the post-curing period up to 5 min, for all evaluated methods.
[Cunha, Leonardo Goncalves; Elias Claro Neves, Ana Christina] Universidade de Taubaté (Unitau), Dept Prosthodont
[Bruschi Alonso, Roberta Caroline] Univ Estadual Campinas, Dept Restorat Dent, Dent Mat Div, Piracicaba Dent Sch, Piracicaba, SP, Brazil
[de Souza, Eduardo Jos Carvalho, Jr.] Univ Fed Bahia, Sch Dent, Salvador, BA, Brazil
