Analysis of gap formation at tooth-composite resin interface: effect of C-factor and light-curing protocol
DOI:
https://doi.org/10.1590/S1678-77572007000400006Keywords:
Composite resins, C-Factor, Light-curing protocol, Gap formation, Polymerization shrinkageAbstract
OBJECTIVE: The aim of this study was to evaluate the effect of C-factor and light-curing protocol on gap formation in composite resin restorations. Material and METHODS: Cylindrical cavities with 5.0 mm diameter and three different depths (A=1.0, B=2.0 and C=3.0 mm) were prepared on the occlusal surface of 30 human molars and restored in a single increment with P 60. The composite resin was light-cured according to two protocols: standard - 850 mW/cm² / 20 s and gradual - 100 up to 1000 mW/cm² / 10 s + 1000 mW/cm² / 10 s. After storage in distilled water (37°C/7 days), the restorations were cut into three slices in a buccolingual direction and the gap widths were analyzed using a 3D-scanning system. The data were submitted to ANOVA and Student-Newman-Keuls test (alpha=0.05). RESULTS: ANOVA detected a significant influence for the C-factor and light-curing protocol as independent factors, and for the double interaction C-factor vs. light-curing protocol. Cavities with higher C-factor presented the highest gap formation. The gradual light-curing protocol led to smaller gap formation at cavity interfaces. CONCLUSIONS: The findings of this study suggest that the C-factor played an essential role in gap formation. The gradual light-curing protocol may allow relaxation of composite resin restoration during polymerization reaction.Downloads
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Published
2007-08-01
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Original Articles
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How to Cite
Analysis of gap formation at tooth-composite resin interface: effect of C-factor and light-curing protocol . (2007). Journal of Applied Oral Science, 15(4), 270-274. https://doi.org/10.1590/S1678-77572007000400006