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Type: Artigo de periódico
Title: Influence Of Irradiance On The Push-out Bond Strength Of Composite Restorations Photoactivated By Led.
Author: Segreto, Dario
Brandt, William Cunha
Correr-Sobrinho, Lourenco
Sinhoreti, Mario Alexandre Coelho
Consani, Simonides
Abstract: The aim of this study was to compare the bond strength of resin composites to dental structure photoactivated with a light emitting diode (LED) curing unit. One hundred bovine incisors were selected and a conical cavity was prepared in the facial surface of each tooth. Clearfil SE Bond (Kuraray CO., LTD. Osaka, Japan) adhesive system was applied, and the cavities were filled with a single increment of Filtektrade mark Z250 (3M ESPE, St. Paul, MN, USA) or Esthet-X (Dentsply-Caulk - Mildford, DE, USA). The specimens were assigned to ten groups (n=10) according to the irradiance used: 100, 200, 300, 400, or 500 mW/cm(2). Photoactivation was accomplished using an Ultrablue IS LED (DMC Equipamentos LTDA, São Carlos, SP, Brazil). The radiant exposure time was kept constant. A push-out test was conducted in a universal testing machine. Bond strength values were submitted to a two-way analysis of variance (ANOVA) and a Tukey's test at the 5% significance level. The bond strength of the Z250 was higher than the Eshet-X (p<0.05). However, the modulation of irradiance adjusted to the same radiant exposure had no influence on Z250. The bond strength using an irradiance of 100mW/cm(2) was higher than the other levels for Esthet-X. When composites were compared, no significant differences were detected between them for activation with irradiances of 100 and 200 mW/cm(2). The modulation of the luminous energy emitted by LED was almost unable to provide significant differences among the groups for both composites, except for a lower irradiance of Esthet-X.
Subject: Analysis Of Variance
Composite Resins
Dental Bonding
Dental Stress Analysis
Resin Cements
Statistics, Nonparametric
Time Factors
Rights: fechado
Identifier DOI: 
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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