Abstract

(1) Background: This study investigated the effect of the adhesive layer thickness and the length of resin tags on dentin bond strength of five universal adhesives applied in self-etch mode. (2) Methods: One hundred and fifty extracted human third molars were used. Five different universal adhesives were applied in self-etch mode on the dentin surface. Half of the specimens were subjected to an aging procedure for six months. A shear bond strength (SBS) test was performed and the results were statistically analyzed with a t-test and one-way ANOVA test. Scanning electron microscopy (SEM) was executed to measure the adhesive layer thickness and tag depth. (3) Results: No statistical differences were found between the five adhesive systems after a 24 h storage period, regardless of layer thickness and tag depth (p < 0.05). After 6 months of aging in water at 37 °C, Iperbond Max and Scotchbond Universal preserved the bond strength over time (p < 0.05), whilst the SBS of Iperbond Ultra, FuturaBond M+, and Ibond Universal decreased significantly after the aging period. No relation was observed between the adhesive thickness or tags’ length on SBS. (4) Conclusions: Within the limitation of this study, the stability over time of the bond strength of universal adhesives depends on their compositions regardless of the adhesive layer thickness and/or tags’ length.

Highlights

  • Universal dental adhesives have been developed to minimize the number of bottles and steps of application in order to make them more user-friendly and less time-consuming during their use in dental treatments [1,2,3]

  • The teeth were divided into five groups (30 teeth each) based on the universal adhesive systems used in this study

  • Higher shear bond strength (SBS) values were obtained for the tested adhesives after 24 h of a storage period compared to those obtained after 6 months (t-test, p < 0.05), except for Scotchbond Universal (SU) and Iperbond Max (IPM) (p > 0.05) (Figure 1)

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Summary

Introduction

Universal dental adhesives have been developed to minimize the number of bottles and steps of application in order to make them more user-friendly and less time-consuming during their use in dental treatments [1,2,3]. Such multimode systems have showed a high 4.0/). Bonding performance to enamel and dentin surfaces [4,5] both when used in etch-and-rinse, in selective-etch, or self-etch mode [6] These adhesives could be classified as strong (pH < 1), mild (pH = 2), or ultra-mild (pH > 2.5), based on their acidity [3]. Several studies demonstrated that modern universal adhesives applied in self-etch or etch-and-rinse mode can achieve substantial bonding to dentin [8,9]

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