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Type: Artigo de periódico
Title: Influence of photoactivation method and mold for restoration on the Knoop hardness of resin composite restorations
Author: Brandt, WC
Silva-Concilio, LR
Neves, ACC
de Souza, EJC
Sinhoreti, MAC
Abstract: The aim of this study was to evaluate in vitro the Knoop hardness in the top and bottom of composite photo activated by different methods when different mold materials were used. Z250 (3M ESPE) and XL2500 halogen unit (3M ESPE) were used. For hardness test, conical restorations were made in extracted bovine incisors (tooth mold) and also metal mold (approximately 2 mm top diameter x 1.5 mm bottom diameter x 2 mm in height). Different photoactivation methods were tested: high-intensity continuous (HIC), low-intensity continuous (LIC), soft-start, or pulse-delay (PD), with constant radiant exposure. Knoop readings were performed on top and bottom restoration surfaces. Data were submitted to two-way ANOVA and Tukey's test (p = 0.05). On the top, regardless of the mold used, no significant difference in the Knoop hardness (Knoop hardness number, in kilograms-force per square millimeter) was observed between the photoactivation methods. On the bottom surface, the photoactivation method HIC shows higher means of hardness than LIC when tooth and metal were used. Significant differences of hardness on the top and in the bottom were detected between tooth and metal. The photoactivation method LIC and the material mold can interfere in the hardness values of composite restorations.
Subject: Dental materials
Composite resins
Surface properties
Hardness test
Dental restoration
Country: Inglaterra
Editor: Springer London Ltd
Citation: Lasers In Medical Science. Springer London Ltd, v. 28, n. 5, n. 1227, n. 1231, 2013.
Rights: fechado
Identifier DOI: 10.1007/s10103-012-1184-2
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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