Failure Criteria of Dentin-Resin Tensile Bond Test—A Fracture Mechanics Approach

Failure criteria of dentin–resin adhesion – The J-integral approach

“…We further ascertained that at a = 0.15 the critical stress intensity factor and minimum stress intensity factor coefficient could also be found. This result implies that 0.15D is actually the critical crack length for the specimen geometry modeled in this study, and is similar to the value proposed by Lin et al [8] though they left the peripheral precrack out of their consideration. Thus, the minimum J-integral which occurs at the critical crack length can be considered the critical J-integral and corresponds to the critical load of the tensile test.…”

“…In 1998, Lin et al first proposed the failure criteria of a dentin-resin tensile bond test through a fracture mechanics approach [8]. In that study, an analytical method was used by deriving fracture mechanics-based equations to obtain the mode I fracture toughness, K IC , and Y, a dimensionless stress intensity factor coefficient.…”

“…A pathway-independent method for approximating the strain concentration of interfacial cracks known as the J-integral was introduced by Rice in 1968 [9]. The purpose of this study was to use the J-integral method to numerically justify the theoretical concepts and the failure criteria of the dentin-resin tensile bond tests proposed by Lin et al [8].…”

Inverse relationship between tensile bond strength and dimensions of bonded area

“…So, this is an expected relationship, and is in agreement with the findings of Sano et al 6 and Phrukkanon, Burrow, and Tyas, 8 who in their previous works established the importance of the area size related to the tensile tests. The first used areas ranging from 0.25 to 11.65 mm 2 and other methodology and the second from 1.1 to 3.1 mm 2 . The present study employs areas ranging from 0.69 to 110.86 mm 2 , a range much wider than these works.…”

Method to compare μ-tensile bond strength of a self-etching adhesive and μ-cohesive strength of adjacent dentin

“…The determination of bond strength of dental adhesives to hard dental tissues is a matter of importance, in accordance with the great changes that adhesive techniques have produced in dentistry [1]. Usually, this bond strength is determined measuring the tensile or shear load at failure [2] between the adhesive and the substrate, divided by the cross-sectional area (BA) of the bonded interface to be tested [3].…”