No difference in effectiveness of Hawley and vacuum-formed retainers at 12 months

Abstract

Data sources

Randomised trial.

Study selection

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.

Data extraction and synthesis

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.

Results

There were no statistically significant differences between each of the two retainers for any of the variables under test at any time period.

Conclusions

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.

Log in or create a free account to read this content

Gain free access to this article, as well as selected content from this journal and more on nature.com

Access through your institution

or

Sign in or create an account

Continue with Google

Continue with ORCiD