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