Assessment of Bonding Effectiveness of Adhesive Materials to Tooth Structure using Bond Strength Test Methods: A Review of Literature

Abstract

Background:The rapid developments in the field of adhesive dental materials have led to improvements in many aspects of clinical dentistry. Adhesive bond strength plays an important role in determining the clinical performance and longevity of dental restorations. Nevertheless, bond strength tests have never been well-standardized, although a number of important recommendations have been made.Objective:The aim of this paper is to critically review the validity of different bond strength testing methods for assessment of bonding effectiveness of adhesive materials to tooth structure and discuss factors that may affect bond strength measurement.Data Collection:Relevant literature published between 1983 and 2018 was collected and reviewed from the PubMed database and Google scholar resources.Review Results:Results of the current bond testing methods should be used to compare materials tested under the same laboratory settings, but they shouldn’t be used to make direct inferences on their clinical behaviour. Shear and micro-shear tests, result in non-uniform stress distribution, stress concentration at the substrate area, and predominantly tensile stresses rather than shear stresses. Micro-tensile bond tests provide many advantages over the shear tests, although these methods are technique sensitive and labour intensive.Conclusion:Bond strength testing methods should be well-standardized, but there are many factors that cannot be fully controlled which leads to variation and misinterpretation of the data about the bonding abilities of adhesives.Clinical Significance:New adhesive materials should be subjected to a combination of testing protocols to properly assess their bonding effectiveness.

Effects of remaining dentin thickness on the bond strength of bleached dentin

“…The minor difference may be due to the different Different uppercase letters in a row indicate significant differences in subgroups (p < 0.05). Different lowercase letters in a column indicate significant differences in different groups with different RDTs (p < 0.05) RDT Remaining dentin thickness origins of the dentin specimens and adhesive systems used [33,41,42]. A significant reduction in the bond strength of bleached dentin was observed when compared with that of unbleached dentin, which is in accordance with previous studies [6,8,9,12,13,37].…”

“…Deep dentin has much less intertubular dentin than superficial dentin, while intertubular dentin plays a key role in the resin-dentin bonding [25,26]. In addition, a recent review demonstrated that RDT significantly affects the bond strength of dentin, which may be attributed to regional differences in wetness [42]. Interestingly, no significant difference in the bond strength was found among the specimens with different RDTs after bleaching.…”

Shear Bond Strength of Three Composite Resins to Fluorosed and Sound Dentine: In Vitro Study

“…Researchers are inclined to use shear bond and microtensile methods as well as fracture mechanics to understand the properties of the adhesive interfaces of dentine. To assess the quality of dental adhesives performance on the bond, bond strength tests are necessary [10,16].…”

Comparison of shear bond strengths with different bevel preparations for the reattachment of fractured fragments of maxillary central incisors

“…Bond strength is the initial mechanical load to fracture divided by the simple, geometrically defined, cross-sectional area of the bond. 14 According to various studies, the technique of tooth preparation is the main factor in increasing shear bond strength (SBS) and the type of bonding system used is considered to be a secondary factor. The SBS is described as the maximum stress that a material can bear before failure with shear loading.…”