Comparison of Shear Bond Strength of an Orthodontic Adhesive with a Restorative Adhesive

Abstract

Background: Bonding of orthodontic brackets to enamel surface using composite resins is a significant improvement in clinical orthodontics. Bond strength tests are categorized as tensile or shear bond strength. The objective of the study was to determine and compare shear bond strength of orthodontic adhesive with a proposed restorative adhesive.
Methods: Eighty extracted human premolar teeth from patients seeking orthodontic treatment were used. Teeth were divided into four major groups consisting of 1st and 2nd upper and lower premolar teeth. Enamel surface of each tooth was etched and bonded with the brackets using orthodontic and restorative adhesives and a light emitting diode device. Shear bond strength of adhesives were measured using MARK-10 testing machine. Adhesive remnant index (ARI) scores were also determined.
Mean bond strength values between groups of teeth were analyzed using One-way analysis of variance (ANOVA) and ARI data analysed using Chi square test.
Results: Shear bond strength values for 1st and 2nd of lower premolar teeth bonded with Resilience were 5.96 and 5.75MPa respectively. The
values for DenFil adhesive were 5.66 and 7.09 MPa respectively. Shear bond strength values for 1st and 2nd upper premolar teeth for Resilience were 6.22 and 7.67 MPa. For DenFil the values were 7.14 and 7.57MPa. There were no significant differences (p>0.05) in the shear bond strength values of all groups of teeth for both adhesives.
Conclusion: Shear bond strength values of DenFil were comparable to Resilience. DenFil may be clinically acceptable as an orthodontic
adhesive.