Evaluation of the Solvent Evaporation Time of Universal Adhesives in the Quality of Cervical Lesions Restorations

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.).