Abstract
The aim of this study was to evaluate the influence of an extended use of desensitizing toothpastes (DTs) on dentin bonding, microhardness and roughness. One hundred and twenty bovine incisor teeth were randomly divided into four groups: G1, distilled water (WATER); G2, Colgate Total 12 (CT12); G3, Colgate Sensitive Pro-Relief (CSPR); and G4, Sensodyne Repair ?αμπ; Protect (SRP). Dentin surfaces were etched with 17% EDTA and 2 years of simulated tooth brushing (20,000 cycles) was performed on their surfaces. Knoop microhardness, surface roughness and scanning electron microscopy (SEM) were performed before and after the simulated tooth brushing. For microshear bonding test, a 2-step self-etching adhesive system (Clearfil SE Bond) was used and 0.8 mm diameter composite resin (Filtek Z350 XT) cylinders were built. Microshear test was performed with an orthodontic wire and with a crosshead speed of 0.5 mm/min. The data were analyzed for: 1) bond strength (one-way ANOVA), 2) microhardness intra-group (Student's test) and inter-group (one-way ANOVA/Tukey's test) comparisons, 3) roughness intra-group (Student's test/Wilcoxon's test) and inter-group (Kruskal-Wallis/Student-Newman-Keuls test) comparisons. The extended use of both dentifrices (conventional and for sensitive teeth) did not affect the bond strength and produced a significant increase in microhardness and roughness of the dentin, except for the microhardness of the SRP group. The simulated tooth brushing technique with water produced an increase in roughness, without reducing significantly the dentin microhardness.
Highlights
Dentin hypersensitivity (DH) is a condition often found in dental clinics, with a prevalence of 25-46% among people between the ages of 18 to 70 years [1]
Dentin surfaces were sectioned with a doublesided diamond disc (KG Sorensen, Cotia, SP, Brazil) to obtain dentin blocks that were placed into a PVC matrix with the following dimensions: 10×5×2 mm, 6×4×2 mm, and 4×4×2 mm
The highest incidence of mixed fracture pattern occurred in the control group (WATER), while adhesive fractures were this difference between the WATER and Colgate Total 12 (CT12) groups (p
Summary
Dentin hypersensitivity (DH) is a condition often found in dental clinics, with a prevalence of 25-46% among people between the ages of 18 to 70 years [1]. There are two scientifically proposed methods for treating DH: the suppression of nerve impulses and the occlusion of exposed dentinal tubules [3,4,5,6,7]. The latter describes the deposition of an obliterating material onto the dentin surface or within the dentinal tubules, resulting in a reduction of their respective diameters, diminishing the movement of the fluids and decreasing mechanoreceptor stimulation [7,8]
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