Effect of the Insertion and Polymerization Technique in Composite Resin Restorations: Analysis of Marginal Gap by Atomic Force Microscopy

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Bomfim da Silva, Marcos Aurelio
Pimentel Lopes de Oliveira, Guilherme Jose [UNESP]
Tonholo, Josealdo
da Silva Junior, Jose Ginaldo
Santos, Lucineide de Melo
Limeira dos Reis, Jose Ivo
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Cambridge University Press
This in vitro study evaluated the marginal gap at the composite tooth/resin interface in class V cavities under the influence of two insertion techniques and a curing system by means of atomic force microscopy (AFM). Forty enamel and dentin cavities were prepared on the buccal surface in bovine teeth with quadratic forms measuring 2 mm X 2 mm and depth of 1.5 mm. The teeth were then divided into four groups: group A, 10 cavities were restored in one increment, light cured by halogen light; group B, 10 cavities filled with bulk filling, light cured by the light emitting diodes (LED); group C, 10 cavities were restored by the incremental technique, light cured by halogen light; group D, 10 cavities were restored by the incremental technique, light cured by the LED. The teeth underwent the polishing procedure and were analyzed by AFM for tooth/restoration interface evaluation. The data were compared between groups using the nonparametric Kruskall-Wallis and Mann-Whitney tests (p < 0.05). The results showed a statistically significant difference between groups A and B and groups A and C. It was concluded that no insertion and polymerization technique was able to completely seal the cavity.
dental marginal adaptation, dental curing light, atomic force microscopy, composite resin, lasers, dental surface analysis
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Microscopy and Microanalysis. New York: Cambridge Univ Press, v. 16, n. 6, p. 779-784, 2010.