different application strategies when using ambar universal in class v cavities

Conditions: Dental Restoration Failure of Marginal Integrity

Summary: treatment clinical trial, randomized, controled, parallel, double-blinded, with four groups, that aims to evaluate the best application strategy when using a new universal adhesive system, ambar universal (fgm, joinville, brazil). volunteers will be selected and recruited,following inclusion criteria and pre-established exclusion. all volunteers will be informed and sign a term of clarification and consent. 38 enrolled patients will receive four class v dental restorations, made in four different ways, one from each experimental group, using the same universal self-etching adhesive system, which is the tested material in this study. non-carious cervical lesions will receive the applied adhesive system in 4 different protocols separated by groups. group self etching (set) (control): no conditioning, the adhesive system will be used in 55 teeth, according to the manufacturer's instructions, in the self-etching mode. the adhesive system will be brushed during 10 seconds in the cavity, will be air-dried during 5 seconds, brushed again during 10 seconds, air-dried during 10 seconds and activated during 10 seconds with light emission diode (led) light; group see (selective enamel etching): 37% phosphoric acid will be applied during 15 seconds, only in enamel in 55 teeth. this acid will be removed using water, the cavity will be air-dried, and then, the adhesive will be applied according to the manufacturer's instructions, as described in group set; group sett (self-etching with extended time): similar to group set, but during the 2 applications, the adhesive systems will be brushed during 20 seconds, and not during 10 seconds as described in group set; group setl (self-etching with extended number of layers): the adhesive system will be applied as describe in group set, but the researchers will apply 4 layers, and not 2 layers, as described in group set. after applying the adhesive, the restorations will be made with composite resin, and evaluated every 6 months for pain assessment, shape, staining or recurrent caries, using scores. to determine in which group each tooth will be enrolled, the authors will randomize the teeth.

this is a treatment clinical trial, randomized, controlled, parallel, double-blinded, with four groups, that aims to evaluate the best application strategy when using a new universal adhesive system, ambar universal (fgm, joinville, brazil). volunteers will be selected and recruited,following inclusion criteria and pre-established exclusion. all volunteers will be informed and sign a term of clarification and consent. all 38 enrolled patients will receive class v dental restorations, made in four different ways, one from each experimental group, using the same universal self-etching adhesive system, which is the tested material in this study. all patients must have at only 20 teeth in function, must have at only 4 non carious cervical lesions (nccl), in different teeth, that need restoration. those lesions must be non carious, must be more than 1 mm deep, should have exposed dentin, and must have at only 50% of margins in enamel. teeth should not present periodontal mobility. firstly, the patient will be anesthetized locally with 3% mepivacaine solution, followed by prophylaxis with pumice powder and water. all cavities will be washed and dried after these procedures for optimal selection of color, using a color scale. then, the rubber dam isolation of the teeth to be restored will be held. non-carious cervical lesions will receive the applied adhesive system in 4 different protocols separated by groups. group set (control): no conditioning, the adhesive system will be used in 55 teeth, according to the manufacturer's instructions, in the self-etching mode. the adhesive system will be brushed during 10 seconds in the cavity, will be air-dried during 5 seconds, brushed again during 10 seconds, air-dried during 10 seconds and activated during 10 seconds with led light; group see (selective enamel etching): 37% phosphoric acid will be applied during 15 seconds, only in enamel in 55 teeth. this acid will be removed using water, the cavity will be air-dried, and then, the adhesive will be applied according to the manufacturer's instructions, as described in group set; group sett: similar to group set, but during the 2 applications, the adhesive systems will be brushed during 20 seconds, and not during 10 seconds as described in group set; group setl: the adhesive system will be applied as describe in group set, but the researchers will apply 4 layers, and not 2 layers, as described in group set. after applying the adhesive, the restorations will be made with composite resin opallis (fgm, joinville, brazil), and evaluated every 6 months for pain assessment, shape, staining or recurrent caries, using scores. to determine in which group each tooth will be enrolled, the authors will randomize the teeth.

Eligibility criteria:
inclusion criteria: * all patients must have at only 20 teeth in function, must have at only 4 non carious cervical lesions (nccl), in different teeth, that need restoration. those lesions must be non carious, must be more than 1 mm deep, should have exposed dentin, and must have at only 50% of margins in enamel. teeth should not present periodontal mobility. exclusion criteria: * volunteers with periodontal disease; with gingival bleeding; use of anti-inflammatory drugs in the last 30 days.

Keywords: dentin bonding agents tooth sensitivity composite resin restoration