Long-term clinical evaluation of bracket failure with a self-etching primer: A randomized controlled trial

Phil Banks, Badri Thiruvenkatachari

    Research output: Contribution to journalArticlepeer-review


    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). Design: Prospective randomized controlled clinical trial. Setting: UK district general hospital with one operator, 2003-6. Participants: Hospital waiting list patients needing fixed appliances (n=60). Method: 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 (n530, brackets n5433) 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. Conclusion: 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. © 2007 British Orthodontic Society.
    Original languageEnglish
    Pages (from-to)243-251
    Number of pages8
    JournalJournal of Orthodontics
    Issue number4
    Publication statusPublished - Dec 2007


    • Bracket placement time
    • Orthodontic bond failure rates
    • Randomized controlled clinical trial
    • Self-etching primer
    • Transbond Plus


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