Abstract
Randomised trial. Patients were randomised to either a Hawley or vacuum-formed retainer following completion of straight wire fixed appliance therapy. Study models were fabricated for each patient on day of debond and 2 months, 6 months, and 12 months after debond. Models were assessed at each time point for upper and lower intermolar widths, intercanine widths, arch length and a modified Little's index of irregularity. Method error was determined by repeating the measurements on 10 sets of models. There were no statistically significant differences between each of the two retainers for any of the variables under test at any time period. There is no statistical or clinically significant difference in the measured arch width, arch length or modified Little's index over a 12-month period between Hawley and vacuum-formed retainers when worn full-time. Therefore, other factors may be more important when deciding on the more appropriate form of retainer.
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