Literature does not show any randomized clinical trial in deciduous teeth with ART Class II restorations, with and without proximal retentions, as well as a comparative study in permanent teeth with ART Class II restorations and traditional resin composite restorations. This multicenter international study seeks to establish the effect of the retention grooves on the survival rates of ART Class II restorations as well as the effectiveness of Class II ART restorations in permanent teeth in comparison to conventional resin-composite Class II restorations. The study will be carried out in Bauru and Brasília (Brazil), Lima (Peru) and Córdoba (Argentina). In this part of the project the null hypothesis is: there is no difference in the cumulative survival rate of Class II ART restorations in posterior permanent teeth of children, adolescents and adults with a retention groove at the dentine-enamel junction in comparison to Class II resin-composite restorations after 3 years. A parallel group design will be used in this study, using permanent teeth, with a test group (ART Class II restorations containing retention grooves), and a control group (conventional resin-composite Class II restorations) of 134 subjects: children, adolescents and adults of 08 - 44-year olds. Only those children or adults whose parents or the participant have given consent for the epidemiological study and for the restorative treatment will be included in the study. The observed data will be analyzed by Qui-square (p<0,05) and Mantel-Haenszel (p<0,05) tests. The project was already approved by the FOB-USP Ethical Committee and is under analysis of CONEP, and will only start after its approval by CONEP.
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