Efeito de dentifrícios dessensibilizantes na morfologia e permeabilidade da dentina erodida e tratada

Abstract

Objectives. To assess if there is maintenance of permeability, roughness and tubular occlusion achieved by treatment with fluoride varnish (Duraphat®) using different commercial dentifrices: Curaprox Enzycal Zero (WF - without fluor), Sorriso Dentes Brancos (NaF - sodium fluoride), BioMin® F (FCPS - fluoro-calcium phospho-silicate bioactive glass), Elmex® Sensitive (AC - arginine and calcium carbonate) e Sensodyne Repair & Protect (NM - novamin). Materials and Methods. Dentin permeability (n=10) was measured through hydraulic conductance test in three moments: after tubule exposure by EDTA immersion, after fluoride varnish application (Duraphat®) and after erosive-abrasive challenge with immersion in citric acid solution, 2 minutes per cycle, and in remineralizing solution, 1 hour per cycle, 4x/day, throughout 5 days. During this cycle, the specimens were abraded with dentifrice slurry for 15s. Confocal laser scanning microscopy was performed after the completion of the cycles. Permeability data were analyzed using 2-way ANOVA and Tukey’s post-hoc tests, roughness was assessed with ANOVA one-way and Tukey’s post-hoc test, the quantification of tubule count, area, and perimeter was assessed using the Kruskal–Wallis test followed by Dunn’s post-hoc analysis. A significance level of 5% was adopted. Results. Only the FCPS and NM toothpastes maintained the properties achieved by desensitizing treatment even after erosive-abrasive challenge. All other groups showed significant difference in these properties. Clinical significance. BioMin® F and Sensodyne Repair & Protect presented a favorable performance in maintaining the desensitizing treatment after erosive-abrasive challenge in vitro conditions simulating the oral environment, indicating its potential as an adjuvant treatment option for dentin hypersensitivity.