Long-term clinical evaluation of bracket failure with a self-etching primer: a randomized controlled trial.
OBJECTIVE
A long-term comparison of the failure rates of orthodontic brackets bonded with either a self-etching primer (SEP) or conventional etch and primer (AE).


METHODS
Prospective randomized controlled clinical trial.


METHODS
UK district general hospital with one operator, 2003-6.


METHODS
Hospital waiting list patients needing fixed appliances (n=60).


METHODS
Experimental (SEP) group patients (n=30) received pre-adjusted edgewise brackets (n=438) bonded with Transbond Plus following manufacturer's instructions. Control (AE) group patients (n=30, brackets n=433) were bonded using a 15-second conventional etch and primer (Transbond XT). In both groups brackets were light-cured for 20 seconds. First-time bond failures were recorded with the time of failure. Bracket bonding time was recorded. All patients were followed to the end or discontinuation of treatment.


RESULTS
Bracket failure rates: SEP=4.8%, AE=3.5%, P=0.793. Mean placement time per bracket (seconds): SEP=75.5 (+/-6.7; 95% CI=72.9, 78.0), AE=97.7 (+/-9.1; 95% CI=94.3, 101.2) P=0.000.


CONCLUSIONS
There was no difference in the failure rates of brackets bonded with either Transbond Plus SEP or conventional AE using Transbond XT paste. Bonding with SEP was significantly faster than using conventional AE.
Banks
Phil
P
Orthodontic Department, Fairfield General Hospital, Bury, Greater Manchester, UK. philbanks_burnly@yahoo.com
Thiruvenkatachari
Badri
B
D000293:Adolescent; D000328:Adult; D016009:Chi-Square Distribution; D002648:Child; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods*; D003799:Dental Stress Analysis; D004311:Double-Blind Method; D004868:Equipment Failure; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D016014:Linear Models; D008137:Longitudinal Studies; D008297:Male; D008422:Materials Testing; D016910:Orthodontic Brackets; D019279:Resin Cements; D013997:Time Factors
D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT