The Shear Bond Strengths of Composite Bonded to Dentine Following Treatment with Two Dentine Occluding Desensitizing Toothpastes

Abstract

Aim: This study determined whether prior brushing with desensitizing toothpastes (Sensodyne Rapid Relief and Colgate Pro-Relief) affected the shear bond strengths of composite to dentine surfaces after appropriate use of two different dentine bonding agents (SingleBond and PQ-1). Materials and Methods: Sixty caries free molar teeth were cleaned, disinfected and embedded in individual cylinders of polymethylmethracyrlate. The occulsal surfaces were flattened to expose dentine and finished down with 600 grit silicone carbide paper. The teeth were randomly divided into six groups of 10 teeth each. Two groups served as control where dentine surfaces were brushed with pumice slurry. Of the remaining 4 groups, 2 groups were brushed with Sensodyne Rapid Relief and 2 groups brushed with Colgate Pro-Relief. The dentine surfaces were brushed to simulate 2 weeks of twice-daily toothpaste use. The specimens in each of the control groups and experimental groups were subjected to dentine bonding procedures (Single Bond or PQ-1), and application of hybrid composite resin (Z-250) according to the manufacturer's instructions. A universal material testing machine, with a cross head speed of 0.05 mm/min was used to determine shear bond strengths. Results: Mean shear bond strengths ranged from 5.71 MPa (Colgate pretreatment, composite bonded with Single Bond) to 9.07 MPa (Sensodyne pretreatment, com-* Corresponding author. S. Marchan et al. 122posite bonded with Single Bond). Results showed neither of the main effects, of toothpaste type or bonding agent were significant (p > 0.05) but their interaction was (F = 4.25, p = 0.02). Post hoc analysis showed that teeth brushed with the Sensodyne group, treated with the unfilled dentine bonding agent had a significantly higher bond strength than those treated with the filled dentine bonding agent. Conclusion: The desensitizing toothpastes that use the mechanism of occlusion of open dentinal tubules in the preliminary management of tooth sensitivity should not have an adverse effect on future restorative treatment modalities.

Influence of Prolonged use of Desensitizing Dentifrices on Dentin Bond Strength of Self-Etching Adhesive System

“…Considering Colgate Sensitive Pro-Relief desensitizing toothpaste, our results are consistent with other studies in the literature Marchan et al, 2014;Yang et al, 2014;Canares et al, 2012), which presented that the use of this toothpaste did not affect bond strength, when compared to the control group, observing even a slight increase in the values of bond strength (Canares et al).…”

“…Nevertheless, it is also acknowledged that the mineral deposits formed by the desensitizing toothpastes mentioned above are unstable (Yang et al), or not tenacious enough, to affect the formation of the hybrid layer (Marchan et al, 2014), therefore, not interfering on bond strength. Studies that used conventional bonding systems in dentin hybridization, which previously were exposed to desensitizing dentifrices, attributed their results to phosphoric acid.…”

Influence of the Extended Use of Desensitizing Toothpastes on Dentin Bonding, Microhardness and Roughness

“…Besides the fact that the extended use of arginine/calcium carbonate (CSPR) and calcium and sodium phosphosilicatebased (SRP) desensitizing toothpastes did not interfere significantly with bonding strength to dentin, it did influence the microhardness and roughness of the substrate. In the microshear test, considering desensitizing toothpastes, the study results agree with other studies available in the literature (15)(16)(17)(18), demonstrating that the use of these toothpastes did not affect the bonding to dentin compared to the control group and included a discrete increase in bond strength values (16).…”

Effect of desensitizing toothpaste containing calcium sodium phosphosilicate on microtensile bond strength of adhesive systems

“…b 15) A previous study revealed that the mineral deposits formed by calcium sodium phosphosilicate desensitizing toothpastes were unstable (62) and not strong enough to affect the formation of the hybrid layer resulting in no interference on bond strength. (63) This was in agreement with the present study which showed that there was no significant difference in microtensile bond strength of adhesive systems treated to dentin between the groups using desensitizing toothpaste containing calcium sodium phosphosilicate compared to nonbrush group in each adhesive system. Therefore, the first null hypothesis was accepted.…”