The Effect of Dentin Desensitizer on Shear Bond Strength of Conventional and Self-adhesive Resin Luting Cements After Aging

Abstract

Following tooth preparation, application of Gluma Desensitizer does not impair the bond strength of conventional resin luting cements with etch-and-rinse adhesive systems and self-adhesive cements. Based on bond strength data and failure types observed, use of Gluma Desensitizer cannot be advised before cementation with Panavia 21. SUMMARYThis study tested the impact of Gluma Desensitizer on the shear bond strength (SBS) of two conventional (RelyX ARC, Panavia 21) and two self-adhesive (RelyX Unicem, G-Cem) resin luting cements after water storage and thermocycling. Human third molars (N¼880) were embedded in acrylic resin. The buccal dentin was exposed. Teeth were randomly divided into four main groups, and the following cements were adhered: 1) RelyX ARC, 2) Panavia 21, 3) RelyX Unicem, and 4) G-Cem. In half of the teeth in each group, dentin was treated with Gluma Desensitizer. In the conventional cement groups, the corresponding etchant and adhesive systems were applied. SBS of the cements was tested after 1 hour (initial); at 1, 4, 9, 16, and 25 days of water storage; and at 1, 4, 9, 16, and 25 days of thermocycling. SBS data were analyzed by one-way analysis of variance (ANOVA); this was followed by the post hoc Scheffé test and a t-test. Overall, the highest

Effect of dentin desensitizers on resin cement bond strengths

“…Gluma did not contribute to improve the bond strength, because Gluma has a better mechanism of action when used to etch-and-rinse approach, when occurs the rewet or the restablishment of the collagen fibrils [24]. Regarding the SEM analysis, the micrographs showed semi-closed dentinal tubules, but it did not form a thick coating, and 50% mixed failures (between adhesive and cohesive in resin cement), 30% adhesive and 20% cohesive failures in resin cement failures (Figure 2).…”

“…Gluma Desensit izer is a gluta ra ldehydeb a s e s u b s t a n c e t h a t c o n t a i n s H E M A (2 -hydroxyethylmethacrylate), causing the coagulation of the dentin fluid proteins in the dentinal tubules and plugs the tubules [6,24]. In fact, glutaraldehyde causes coagulation of proteins inside the dentinal tubules, reacting with the albumin in the dentinal fluid, thus causing the precipitation of albumin and blockage of tubules.…”

Current management of dentin hypersensitivity

“…They have been shown to close dentinal tubules by precipitative intratubular occlusion and thereby to a significant decrease of dentin permeability, even under clinical conditions [9, 10]. As a positive side effect, glutaraldehyde disinfects dentin in vitro and seems compatible with adhesive systems [11, 12]. However, potential biocompatibility hazards should not be neglected [13, 14].…”

Evaluation of bond strength of resin cements using different general-purpose statistical software packages for two-parameter Weibull statistics

“…Fourth, more than one source of failure is controlling defects. As far as the first point is considered, the literature showed clearly that the shear bond strength values lower than 5 MPa could be measured [35,36,37].…”