A retrospective randomized double-blind comparison study of the effectiveness of Hawley vs vacuum-formed retainers

作者：Barlin Stephen; Smith Roland; Reed Ray; Sandy Jonathan; Ireland Anthony John^*

来源：The Angle Orthodontist, 2011, 81(3): 404-409.

DOI：10.2319/072610-437.1

• Retainers
• Retention
• Hawley
• Vacuum formed

Objective: To compare Hawley with vacuum-formed retainers.
Materials and Methods: Eighty-two patients who had received treatment with upper and lower fixed appliances were randomly assigned either a Hawley or a vacuum-formed retainer. Study models were fabricated for each patient on day of debond and 2 months, 6 months, and 12 months after debond. Using a specially constructed pantograph, four variables were measured for each set of models at each of these time periods. These were 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: For each of the variables under test and at each of the four time periods, there were no statistically significant differences (alpha = .05) between each of the two retainers, vacuum-formed and Hawley.
Conclusion: The degree of relapse that is likely to occur following a course of fixed appliance therapy is unlikely to be affected by the choice of retainer, vacuum-formed or Hawley. Therefore, when deciding on the type of retainer to be fitted following fixed appliance therapy, other factors such as cost may play a more significant role. (Angle Orthod. 2011;81:404-409.)

• 出版日期2011-5