Effect of Desensitizing Agents on the Microtensile Bond Strength of a Two-step Self-etch Adhesive to Dentin

Abstract

The aim of this in vitro study was to evaluate the effect of cervical hypersensitivity treatments (neodymium yttrium aluminum garnet [Nd:YAG] laser and conventional techniques) on the microtensile bond strengths of adhesives to treated dentin. The buccal cervical enamel of 42 freshly extracted human mandibular third molars was ground flat to expose the cervical dentin. The dentin surfaces were polished with a series of silicon carbide papers, and the smear was removed with an ethylenediamine tetra-acetic acid solution. The teeth were randomly divided into six groups as follows: group 1, Vivasens; group 2, BisBlock; group 3, fluoride gel; group 4, Nd:YAG laser; group 5, Clearfil SE + Nd:YAG laser; and group 6, no treatment (control). The specimens were then restored with a two-step self-etch adhesive, with the exception of group 5. Five specimens from each group were restored with a nanohybrid composite resin. The adhesive interface of two specimens from each group was examined using scanning electron microscopy. The specimens were sectioned perpendicularly to the adhesive interface to produce beams (adhesive area 1 mm(2)). The beams were then attached to a microtensile tester and stressed to failure at 1 mm/min. The data were compared using one-way analysis of variance at a significance level of 0.05. The microtensile bond strengths of the control group were significantly higher than those found for group 1, group 2, group 3, and group 4 (p< 0.05). No significant difference was found between group 5 and the control group. Most of the premature failures were seen in group 2 (80%), and the fewest premature failures were seen in group 5 (13.3%). The SEM findings verified the microtensile test findings. In conclusion, desensitizing treatment procedures (with the exception of Clearfil SE + Nd:YAG laser) reduced the microtensile bond strength of a two-step self-etch adhesive to dentin.

Fatores Que Interferem Na Decisão Da Mudança Alimentar Em Pacientes Com Diabetes

“…A previous study that tested the microtensile bond strength between self-etching and total-etching adhesives in dentin treated with fluoride gel obtained results lower than the control group (any treatment). 27 The authors observed a distortion in hybrid layer by SEM images, fact that could be related to lower bond strength, agreeing with the present study. 27 Infiltration of adhesive systems between dentin collagen fibers, if performed correctly, promotes sealing of dentin tubules.…”

“…27 The authors observed a distortion in hybrid layer by SEM images, fact that could be related to lower bond strength, agreeing with the present study. 27 Infiltration of adhesive systems between dentin collagen fibers, if performed correctly, promotes sealing of dentin tubules. [27][28][29] The AD group when associated to MS resin cement (Variolink II) showed 8.35 MPa mean SBS and 37.5% of cohesive failures.…”

“…25 Although the in vitro shearing test does not perfectly replicate in vivo behavior, as demonstrated in the study by Murray and Hobson (2003), 26 it does reveal that the bond strength in samples exposed to the oral environment for 4 and 8 weeks are significantly lower than that when exposed to a sterile water environment at 37°C for the same period. A similar result was found in the study by Penido et al (2008), 27 in which the authors also observed that the in vivo mean bond strength was significantly lower in relation to in vitro mechanical assays.…”

Effect of Dentın Desensitizing Agents on Dentin-Adhesive Cement Bonding: An In-Vıtro Study

“…Ancak, bu ajanların adeziv rezinlerin bağlanma dayanımına etkisiyle ilgili literatürde çelişkili sonuçlar vardır. 6,7,8,9 Çalışmamızın amacı; dentin hassasiyetinde kullanılan iki farklı preparatın adeziv simantasyondaki bağlantıya etkisinin karşılaştırılmalı olarak in vitro incelenmesidir. …”

Inhibition of dentin matrix‐bound cysteine cathepsins by potassium fluoride

“…Potassium fluoride (KF) is one of the F ‐ compounds used in dentin adhesives and dentin desensitizing agents . Hence, this study aimed to investigate the use of KF on the inhibition of the dentin matrix‐bound MMPs and CCs in order to improve the stability of demineralized dentin matrices.…”