evaluation of the solvent evaporation time of universal adhesives in the quality of cervical lesions restorations

Conditions: Non-carious Cervical Lesions

Summary: the aim of this study will be to evaluate the effect of prolonging solvent evaporation time on the 6- and 12-months clinical performance of two universal adhesive systems used as selective enamel etch (see). methods: 140 restorations will be randomly placed in 35 subjects according to the following groups: sup5 (scotchbond universal plus evaporated for 5 s); sup25 (scotchbond universal plus evaporated for 25 s); gbu5 (gluma bond universal evaporated for 5 s); gbu25 (gluma bond universal evaporated for 25 s). resin composite will be placed incrementally and light-cured. the restorations will be evaluated at baseline, after a week, 6 and 12 months using the fdi and usphs criteria. statistical analyses will be performed using appropriate tests (α = 0.05).

this is a four-arm, double-blind, randomized controlled clinical trial. experimental group 1: 35 non-carious cervical lesions (nccl) will receive composite resin restorations using an alcohol- and water-based solvent universal adhesive (scotchbond universal plus; 3m) in the selective enamel etching strategy with evaporation of solvent for 25 seconds. experimental group 2: 35 non-carious cervical lesions (nccl) will receive composite resin restorations using an acetone-based universal solvent adhesive (gluma universal bond; kulzer) in the selective enamel etching strategy with solvent evaporation for 25 seconds. control group 1: 35 non-carious cervical lesions (nccl) will receive composite resin restorations, using an alcohol- and water-based universal solvent adhesive (scotchbond universal plus; 3m), in the selective enamel etching strategy, with evaporation of solvent for 5 seconds. control group 2: 35 non-carious cervical lesions (nccl) will receive composite resin restorations, using an acetone-based universal solvent adhesive (gluma universal bond; kulzer), in the strategy of selective enamel etching, with solvent evaporation for 5 seconds. lcncs will be randomized to universal adhesive usage and flash-off time. all groups will be light-cured with a light-curing device (smartlite focus, dentsply) with a light intensity of 855 mw/cm² for 20 seconds. operators will restore the cervical area by applying three increments of resin (opallis, fgm prod. odont.ltda, joinville, sc, brazil). each increment will light cure for 10 s at 1200 mw/cm2 (radii cal, sdi, victoria, australia). restorations will be finished immediately with fine diamond burs (#3195f and #3195ff, kg sorensen, barueri, sp, brazil) and polished with discs and polishing gums (soflex, 3 m espe, st. paul, mn, ee. uu.).

Eligibility criteria:
inclusion criteria: * patients older than 18 years. * presence of at least two non-carious cervical lesions in the dental arch with a need for restorative treatment. * acceptable level of oral hygiene according to the simplified oral hygiene index. * at least 20 teeth in function. * non-carious cervical lesions with a maximum of 50% of enamel margin. exclusion criteria: * driving difficulties that prevent adequate oral hygiene. * periodontal disease. * active caries lesions on the teeth included in the research. * parafunctional habits. * active staples of removable partial dentures on the teeth included in the research and that these are not pillars of prostheses.

Keywords: dental bonding tooth erosion tooth wear adhesive systems solvent