Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/198115
Type: Artigo de periódico
Title: Effect Of Different Photo-activation Methods On Push Out Force, Hardness And Cross-link Density Of Resin Composite Restorations.
Author: Brandt, William Cunha
de Moraes, Rafael Ratto
Correr-Sobrinho, Lourenço
Sinhoreti, Mário Alexandre Coelho
Consani, Simonides
Abstract: To evaluate push out force, hardness and cross-link density (CLD) of composite restorations photo-activated by different methods. Z250 (3M ESPE) and XL2500 halogen unit (3M ESPE) were used. For push out force and hardness tests, conical restorations were made in bovine incisors. For CLD evaluation, cylindrical specimens were prepared. Different activation methods were tested: high-intensity continuous (HIC), low-intensity continuous (LIC), soft-start (SS) or pulse-delay (PD), with constant radiant exposure. Knoop readings were performed on bottom and top surfaces. Data were submitted to two-way ANOVA and Tukey's test (alpha=0.05). Push out force data were submitted to ANOVA and Tukey's test (alpha=0.05). Failure modes were classified under magnification (40x). CLD was estimated by hardness readings before and after storage in ethanol. Data were submitted to RM-ANOVA and Tukey's test (alpha=0.05). No significant differences in top hardness (KHN, N/mm2) were observed for HIC (598), LIC (564), SS (585) and PD (573). LIC presented significantly lower bottom hardness (520) than HIC (574), SS (562) and PD (572). Push out force (N) for SS (246) and PD (238) were similar, but significantly higher compared to LIC (198) and HIC (193). For HIC and LIC, only adhesive and mixed failures were observed. For SS and PD, cohesive failures also occurred. After storage, HIC and LIC presented significantly lower softening than PD. HIC also presented lower softening than SS, and similar results were observed for SS and PD. Different activation methods can interfere with push out force, hardness and CLD of composite restorations.
Subject: Animals
Bisphenol A-glycidyl Methacrylate
Cattle
Composite Resins
Dental Cavity Preparation
Dental Materials
Dentin-bonding Agents
Ethanol
Hardness
Light
Lighting
Materials Testing
Solvents
Stress, Mechanical
Surface Properties
Time Factors
Rights: fechado
Identifier DOI: 10.1016/j.dental.2007.09.012
Address: http://www.ncbi.nlm.nih.gov/pubmed/18045677
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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