Can Flowable Bulk Fill Composites be Used in Proximal Area of Class II Restorations

Treatment clinical trial, randomized, controlled, parallel, double-blinded, with two groups, that aims to evaluate the best application strategy when using a flowable bulk fill composite (Opus Bulk Fill Flow APS, FGM, Brazil) in class II cavities. Volunteers will be selected and recruited, following inclusion criteria and pre-established exclusion criteria. All volunteers will be informed and sign a term of clarification and consent. 38 enrolled patients will receive 76 Class II dental restorations, made in two different ways, one from each experimental group. Authors will perform restorations with an incremental composite (Vittra APS - FGM) associated with a bulk-fill flowable composite (Opus Bulk Fill Flow APS - FGM), in class II cavities, exposing (Group BP) or not (Group IP) the bulk fill flowable composite to the cavosurface angle on the proximal wall of the restorations. In both groups, Opus Bulk Fill Flow APS resin will be used in the bulk technique with up to 5mm depth increments, leaving 1 mm in the occlusal for incremental Vittra APS composite resin. Immediate post-operative tooth sensitivity will be evaluated after one week. Restorations will be evaluated every 6 months for pain assessment, shape, fractures, staining or recurrent caries, using FDI scores. To determine in which group each tooth will be enrolled, the authors will randomize the teeth.