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A Prospective Randomized Clinical Trial to Compare Pre-coated and Non-pre-coated Brackets

North Hampshire Hospital, Basingstoke, UK.

Dr M. Wong, Department of Orthodontics, The North Hampshire Hospital, Basingstoke, UK. Email: mwong{at}nhh.u-net.com

Objective: To compare the clinical failure rate of pre-coated brackets and brackets bonded using Transbond XT light cure system

Outcome measures: (i) The clinical time required for bond up of upper and lower arches of both systems, (ii) bond failure rate for the first 6 months.

Design: Single centre randomized controlled clinical study. Thirty-three patients were bonded using a split mouth technique: randomly allocating the pre-coated brackets to upper left and lower right quadrants, and non-pre-coated brackets to the other quadrants.

Setting: Hospital Orthodontic Department, Basingstoke, Hampshire, UK.

Subjects: Orthodontic patients requiring fixed appliances.

Main outcome measures: The site and time to bond failure was recorded for each bracket that failed over the first 6 months. The time required to bond upper and lower arches was measured using a stopwatch for each patient.

Results: t-Test for the difference of mean time needed to apply both groups of brackets, no significant difference (P > 0.2) was found. A chi-squared test for the difference in bracket failure between pre-coated (8.06%) and non-pre-coated (7.37%) showed no significant difference in bracket failure (P > 0.2).

Conclusions: The clinical failure rate of pre-coated brackets is not significantly lower than conventional non-pre-coated brackets.

Key words: Pre-coated brackets, bondfailure, bonding time

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