Influence of two self-etching primer systems on enamel adhesion

Abstract

The aim of this study was to compare two self-etching and a total-etch adhesive systems by assessing their shear bond strength to bovine enamel and the microleakage on class V composite restorations prepared on bovine enamel. Bovine teeth selected and allocated in three groups: Group 1: Scothbond Multi-Purpose; Group 2: Clearfil Liner Bond 2V; Group 3: Etch & Prime 3.0. For the microleakage test, each group was composed of ten class V restorations on the buccal surface. Two examiners attributed scores ranging from 0 (without leakage) to 3 (maximum leakage) to determine silver nitrate penetration at enamel-composite interface. Microleakage data were analyzed statistically by Kruskal-Wallis and Mann-Whitney tests at 5% significance level. For the bond strength test, ten teeth of each group were included, had their buccal surfaces flattened in order to obtain a 3-mm-diameter area to which a resin cylinder was bonded. After one week, the specimens were tested in shear strength at a crosshead speed of 0.5 mm/min. Bond strength data were treated by ANOVA and LSD tests at 5% significance level. The debonded interfaces were examined under scanning electron microscopy. No leakage was observed along enamel margins. Means (+/- SD) in MPa were: 18.75 (+/-5.83), 22.17 (+/-4.95) and 14.93 (+/-6.7) for Groups 1, 2, and 3, respectively. According to the results of this study, the self-etching primer systems presented statistically similar behavior (p>0.05) to that of the total-etch adhesive system (used as a control), not only regarding marginal leakage at bovine enamel-composite resin interface, but also regarding the shear bond strength of the bovine enamel. However, the self-etching primer systems differed significantly (p>0.05) to each other, with better results for Clearfil Liner Bond 2V. In conclusion, the self-etching primer systems had a performance comparable to that of the total-etch adhesive system.

Shear bond strengths of different adhesive systems to white mineral trioxide aggregata

“…This finding was in agreement with those of previous studies 19,22,26) . Several reasons have been advocated to account for the suboptimal performance of self-etch adhesives: (1) the combination of acidic hydrophilic and hydrophobic monomers into a single step may compromise the polymerization of the adhesive; (2) the inherently low strength of the adhesive polymer; and (3) the lower degree of polymerization of the resin monomer due to a major solvent/oxygen inhibition effect during light activation of these materials 27) . Amongst the self-etch adhesives, the results of the present study revealed that AS (a two-step selfetch adhesive) exhibited higher shear bond strength than LP (a one-step self-etch adhesive).…”

The Evaluation of Bond Strength of a Composite and a Compomer to White Mineral Trioxide Aggregate with Two Different Bonding Systems

“…The most common method to evaluate adhesive properties of restorative materials is bond strength assessment. This has become a well-recognized method to analyze an important part of the in vitro performance of materials (14,15). So the shear bond strength test has been used in this study to evaluate the adhesive properties of WMTA to composite and compomer restorative materials.…”

Effect of Phosphoric Acid Etching of Enamel Margins on the Microleakage of a Simplified All-in-One and a Self-etch Adhesive System

“…[17][18] Some studies reported that self-etching primer systems performed comparably to that of total-etch adhesive systems. 19 However, in other studies, self-etching adhesives showed greater scales of microleakage than adhesives using conventional phosphoric acid as the etchant. 13,16,[20][21][22] There is some concern that the manufacturers are sacrificing enamel bond strength for self-etching primers.…”