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A randomized clinical trial comparing the accuracy of direct versus indirect bracket placement

University of Birmingham Dental School

D. J. Spary

Queens Hospital, Burton upon Trent, UK

Address for correspondence: W.P. Rock, University of Birmingham Dental School, St Chad’s Queensway, Birmingham. B4 6NN, UK. Email: w.p.rock{at}bham.ac.uk

Objective: To determine the accuracy of direct or indirect bracket placement.

Design: A prospective, randomized comparison of 2 different methods of bracket placement.

Setting: Queens Hospital, Burton upon Trent, UK between February and May 2001.

Materials and method: Twenty-six consecutive patients requiring upper and lower MBT^TM pre-adjusted Edgewise appliances had their labial segments bonded directly or indirectly according to a split mouth system of allocation. Before and after bond-up all brackets were photographed and measured from tracings to determine positional differences from the ideal.

Results: Using ANOVA (General Linear Model), vertical errors were found to be greater than those in the horizontal plane, which in turn were greater than angular errors (p<0.05). Errors were greater in the maxillary arch than in the mandibular arch. There was no significant difference between the mean errors produced by the two methods of bracket placement.

Conclusions: Mean bracket placement errors were similar with both techniques.

Key words: Accuracy, bracket placement, direct bonding, indirect bonding, randomized clinical trial

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