Examinando por Materia "Preparación cavitaria clase II"

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(Universidad Privada Norbert Wiener, 2012) Gálvez Saldaña, Santos; Galvez Ramirez, Carlos Michell
The purpose of this study was to determine the degree of microleakage in composite resins in relation to the cavity preparation surface finish of class II cavities with a right-angle and bevel angle in dental pieces. The in vitro study was experimental, analytical, cross-sectional, prospective, and applicative in nature. Sample: 60 human teeth. Class II cavities were prepared in all, with 30 having a right-angle surface finish and 30 with a bevel-angle surface finish. All samples were filled with composite resin. They were hydrated in 0.9% sodium chloride for one week, and the apices were sealed with acrylic resin. A total of 250 thermocycling cycles at temperatures of 5°C and 55°C were performed. The samples were then immersed in 2% methylene blue for one week. Vertical, horizontal, and coronal cuts were made to evaluate all walls involved in this research, and then observed under an optical microscope at 10x magnification. As a result, in the vertical cut, the three respective degrees of microleakage showed average differences of 30%, 10%, and 20%. In the horizontal cut, the three degrees of microleakage showed average differences of 40%, 10%, and 40%. In the coronal cut, the four degrees of microleakage showed average differences of 20%, 57%, 27%, and 50%, all favoring the bevel-angle restorations. In conclusion, restorations with a bevel-angle cavity preparation surface finish exhibited less microleakage compared to restorations with a right-angle surface finish.