Effect of Wet and Overwet Dentin on the Clinical Performance of Two Universal Adhesive Systems

Overview

The aim of this study will be to evaluate the effect of wet and overwet dentin on the long-term clinical performance of two universal adhesive systems used as etch-and-rinse application mode in non-carious cervical lesions (NCCLs). Materials \& Methods: 200 restorations will be randomly placed in 50 subjects according to the following groups (n=50): AMP-wet (Ambar Universal APS Plus adhesive on wet dentin); AMP-overwet (Ambar Universal APS Plus adhesive on oversaturated dentin); PBA-wet (Prime\&Bond Active adhesive on wet dentin); PBA-overwet (Prime\&Bond Active adhesive on oversaturated dentin). For all groups, the enamel and dentin will be etched for 15s. All groups will be light-cured for 10s/1,000 mW/cm2. A resin composite will be placed by applying three increments and each one was light cured for 20s/1,000 mW/cm2. The restorations will be finished immediately with fine diamond burs and spiral polishers. The restorations will be evaluated at baseline and after 6 months by using the FDI criteria. The following outcomes will be evaluated: retention, marginal staining, marginal adaptation, post-operative sensitivity and recurrence of caries. The differences among the groups will be calculated using Friedman repeated measures analysis of variance rank (α = 0.05).

This is a four-arm, double-blind, randomized controlled clinical trial. Control group 1: 50 non-carious cervical lesions (NCCL) will receive composite resin restorations using an universal adhesive (Ambar Universal APS Plus; FGM) on wet dentin in the etch-and-rinse application strategy. Control group 2: 50 non-carious cervical lesions (NCCL) will receive composite resin restorations using an universal adhesive (Prime\&Bond Active; Dentsply Sirona) on wet dentin in the etch-and-rinse application strategy. Experimental group 1: 50 non-carious cervical lesions (NCCL) will receive composite resin restorations using an universal adhesive (Ambar Universal APS Plus; FGM) on overwet dentin in the etch-and-rinse application strategy. Experimental group 2: 50 non-carious cervical lesions (NCCL) will receive composite resin restorations using an universal adhesive (Prime\&Bond Active; Dentsply Sirona) on overwet dentin in the etch-and-rinse application strategy LCNCs will be randomized to universal adhesive usage and dentinal moisture levels. All groups will be light-cured with a lightcuring device (Quazar, FGM) with a light intensity of 900 mW/cm² for 10 seconds. Operators will restore the cervical area by applying three increments of resin (Llis-FGM for experimental groups 1 and 2; and TPH Spectrum-Dentsply for experimental groups 3 and 4). Each increment will light cure for 20 s at 900 mW/cm2 (Quazar, FGM). Restorations will be finished immediately with fine and extra fine diamond burs and polished with polishing spirals.