Characterization of an Experimental Two-Step Self-Etch Adhesive’s Bonding Performance and Resin-Dentin Interfacial Properties

Abstract

This study evaluated an experimental two-step self-etch adhesive (BZF-29, BZF) by comparing it with a reference two-step self-etch adhesive (Clearfil Megabond 2, MB) and a universal adhesive (G-Premio Bond, GP) for microtensile bond strength (μTBS) and resin-dentin interfacial characteristics. Twenty-four human third molars were used for the μTBS test. Bonded peripheral dentin slices were separated to observe the resin-dentin interface and measure the adhesive layer thickness with SEM. μTBS data of the central beams were obtained after 24 h and 6 months of water storage. Fracture modes were determined using a stereomicroscope and SEM. Nine additional third molars were used to determine the elastic modulus (E) employing an ultra microhardness tester. Water storage did not affect μTBS of the tested adhesives (p > 0.05). μTBS of BZF and MB were similar but significantly higher than GP (p < 0.05). BZF achieved the highest adhesive layer thickness, while GP the lowest. E of BZF and MB were comparable but significantly lower than GP (p < 0.05). Except for GP, the predominant fracture mode was nonadhesive. The superior bonding performance of BZF and MB could be attributed to their better mechanical property and increased adhesive thickness imparting better stress relief at the interface.

Comparative Study on Interface Fracture of 4th Generation 3-Steps Adhesive and 7th Generation Universal Adhesive

“…Chowdhury AFMA et al, following an SEM comparison of self-etch and multi-etch adhesives, obtained similar results to ours. The fewer steps that the adhesives protocol had, the more ineffective they became [43]. Additionally, the study by Kasahara Y et al concluded that three-step adhesives are superior to universal and two-step adhesives [44].…”

Influence of Novel Experimental Light-Cured Resin Cement on Microtensile Bond Strength

“…This phenomenon might occur due to further polymerization after 24 h. Notably, AP was bonded with the dentin bonding agent SE. Recent studies reported that when AP is bonded with SE, it has high and stable bonding performance with dentin substrates [ 24 , 25 ]. The bonding agent and primer SE includes the functional monomer 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP).…”