Thind BS, Stirrups DR, Hewage S. Bond failure of gingivally offset mandibular premolar brackets: a randomized controlled clinical trial.
Am J Orthod Dentofacial Orthop 2009;
135:49-53. [PMID:
19121500 DOI:
10.1016/j.ajodo.2007.05.016]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2006] [Revised: 05/01/2007] [Accepted: 05/01/2007] [Indexed: 12/01/2022]
Abstract
INTRODUCTION
The purpose of this randomized controlled clinical trial was to examine the clinical bond failure rate of gingivally offset mandibular premolar brackets and compare it with that of standard mandibular premolar brackets.
METHODS
Eighty-three patients were enrolled in this trial. A total of 240 brackets--120 standard and 120 offset--were bonded in a split-mouth design.
RESULTS
Ten standard brackets and 1 offset bracket debonded during the trial period. Survival times were analyzed by using the Kaplan-Meier nonparametric test, and comparisons between bracket types were made with the Mantel-Haenszel log rank test. These tests showed that the failure rate between the bracket types was statistically significant (P <0.0058).
CONCLUSIONS
Gingivally offset mandibular premolar brackets have a lower bond failure rate than standard mandibular premolar brackets.
Collapse