Shear Bond Strength of Brackets Bonded with Self-Etching Primers Compared to Conventional Acid Etch Technique: A Randomized Clinical Trial
Objective: The purpose of this randomized clinical trial was to compare the shear bond strength (SBS) of orthodontic brackets bonded to enamel with conventional acid etch (AE) technique and self-etching primers (SEP) system.
Materials and Methods: Twenty-two patients requiring extraction of two bicuspids for orthodontic reasons were recruited. In each individual, following blinding and allocation concealment, one intact premolar received conventional AE and contralateral premolar received SEP with split-mouth design. Bonded brackets remained in the oral cavity for 2 months. Afterwards, the teeth were extracted in such a way not to debond brackets. SBS and adhesive remnant index (ARI) were measured using Universal Instron machine and stereomicroscope, respectively.
Results: The mean SBS of conventional AE and SEP were 9.53 and 9.20 MPa, respectively. Paired-t test showed no statistical significant difference between the two groups (P=0.096). Comparison of ARI between the two groups, using Wilcoxon test, indicated that brackets bonded with SEP had significantly less adhesive on enamel than did conventional AE (P<0.001).
Conclusion: The present study indicated that although there is no significant difference in SBS between SEP and conventional AE for bonding orthodontic metal brackets, the amount of residual adhesive on the enamel surface is significantly less in SEP than that in conventional AE (IRCT registration number: IRCT201705099086N3).
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