Bond strength test: role of operator skill

Abstract

Background: Test method, substrate material and operator variability are factors known to affect bond strength test outcomes. The aim of this study was to determine if, with increasing experience, individual operator skill in material handling influenced microshear bond strength outcomes. Methods: This retrospective study used data collected from six preliminary tests carried out successively on enamel microshear bond strength for two adhesives: Clearfil SE Bond (Kuraray) and Adper Single Bond 2 (3M ESPE) by one operator. Mean and median microshear bond strength values, standard deviations and coefficients of variation for each adhesive test group were calculated and assessed. Results: A gradual increase in mean microshear bond strengths, a decrease in standard deviations and coefficients of variation over time for both adhesives and a progressively more uniform distribution of microshear bond strength results recorded in individual test sets was observed. The results suggest an improvement in bonding reliability as experience is gained. Conclusions: Operator skill in material handling appears to play a critical role in determining the outcome of bond strength testing. This same skill is probably relevant when using an adhesive for the first time clinically. It is important that clinicians become familiar with new adhesives in order to achieve optimal outcomes.

Micro-shear bond strength of adhesive resins to enamel at different relative humidity conditions

“…Among many studies, where adhesion of total-etch, two-step self-etch and one-step self-etch adhesive systems to enamel was studied, Lopes et al 17) emphasized the similarity of the bond strength to enamel between total-etch system and two-step selfetch system whereas some studies 18,19) pointed out the differences between SB2 and CSE on bond strength to enamel. Our results were comparable with the third preliminary study of Adebayo et al 20) , regarding the mean μSBS values of SB2 and CSE adhesives. On the other hand, McLeod et al 21) observed that the total-etch systems showed significantly higher shear bond strength to enamel than those of self-etch systems where they used CSE and AEB.…”

“…In vitro studies are considerably influenced by the testing parameters. Thus, our study can only be compared in the real sense with those studies where also microshear test was used [18][19][20]22) . The quality of the bond strength of self-etch adhesive systems is related to their acidity.…”

White Spot Lesions: Prevention and Management During the Orthodontic Treatment

“…Other previous studies showed similar results, except those finding that the maxillary central incisors had a greater frequency of WSLs than did the maxillary second premolars. No significant differentces were found in WSLs incidence and prevalence between the right and left sides of the maxilla and mandible [5][6][7].…”

Effect of Tooth Surface Preparation on the Bonding of Self-Etching Primer Adhesives

“…[1][2][3] Surface characteristics of tooth structure resulting from different preparations of protocols may affect bonding effectiveness, but this may depend on the type of adhesive system used. Generally, total-etch adhesives are less affected by surface characteristics than are self-etching primer adhesives.…”