Effect of surface protection associated to different bonding protocols on the bond strength to eroded dentin
International Journal of Development Research
Effect of surface protection associated to different bonding protocols on the bond strength to eroded dentin
Received 03rd November, 2018; Received in revised form 26th December, 2018; Accepted 16th January, 2019; Published online 28th February, 2019
Copyright © 2019, Vivian Leite Martins et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Erosion, also known as biocorrosion, is a type of dental wear, promoted by chemical process in absence of bacteria. The objective of the present study was to evaluate the effect of superficial protection and bonding protocols on bond strength to eroded dentin. Sound human molars had occlusal dentin exposed and were allocated into 16 groups (n = 10) according to the association between three main factors: simulation of endogenous erosion (absent or 18 DES-RE cycles); previous surface protection (absent or glass-ionomeric sealant), and protocol for dentin bonding with an universal adhesive system (with or without phosphoric acid etching; and exposed or not to chlorhexidine). Composite resin buildups were constructed on the dentin surfaces, the specimens were sectioned and submitted to the microtensile test. The sticks obtained from each tooth were divided in two groups. The first one was tested after 24 hours and the second was stored in water for seven months. Results for each period were analyzed by means of 3-way ANOVA and Tukey test. The comparison between the two periods was done by Student's t-test, for paired data. According to the statistical analysis, bonding procedures didn’t interfere on immediate bond strength values. The erosive challenge reduced the immediate bond strength in the absence of surface protection, but not in the presence of the glass-ionomeric sealant. After storage, the effect of the erosive challenge couldn’t be noted; and the use of chlorhexidine resulted in decreased bond strength in groups previously coated with glass-ionomer sealant. It could be concluded that eroded dentin surfaces previously coated with glass-ionomer sealant might have impaired bonding; and that chlorhexidine was not able to increase bonding stability after storage. Finally, both self-etch and etch-and-rinse protocols seems to be feasible for the use of the universal adhesive system on eroded dentin surfaces.
