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No difference in the failure rates of orthodontic brackets bonded with self-etching primer
1Department of Orthodontics, Institute Of Dental Studies and Technology, Delhi, India.
Design:
This was a randomised controlled clinical trial (RCT) in a UK district general hospital.
Intervention:
The interventions tested were orthodontic brackets bonded with standard light-cured hydrophobic primer [acid etch (AE); Transbond XT, 3M Unitek, Monrovia, California, USA] compared with self-etching primer (SEP; Transbond-Plus, 3M Unitek). Both groups used Transbond XT paste(3M Unitek) and curing light.
Outcome Measure:
The primary outcome was first-time bracket failure recorded by date and tooth number. Secondary outcomes were mandibular and maxillary bracket failures and the time taken to bond the bracket.
Results:
There were no statistical differences in failure rates between SEP (4.8%) and AE (3.5%). Bonding time per bracket with SEP was significantly lower at 75.5 s (95% confidence interval, 72.9-78.5) in the SEP compared with the AE group (97.7 s; 95% confidence interval, 94.3-101.2).
Conclusions:
There was no difference in the failure rates of brackets bonded with either SEP or conventional AE using Transbond XT paste. Bonding with SEP was significantly faster than using conventional AE.