使用微型传感器测量的霍利保持器佩戴时间与下颌弓稳定性有关吗？

Is wear time of Hawley retainers measured with microsensors related to mandibular arch stability?

作者信息

Atik Ezgi, Taner Tulin, Aksu Muge

机构信息

Department of Orthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.

出版信息

J Orofac Orthop. 2025 Jan;86(1):49-57. doi: 10.1007/s00056-023-00495-x. Epub 2023 Sep 20.

DOI:10.1007/s00056-023-00495-x

PMID:37731053

Abstract

PURPOSE

The aim of this study was to show a possible correlation between the mean wear time of Hawley retainers and long-term mandibular arch stability as assessed via wear time analysis with microsensors.

METHODS

This longitudinal retrospective study comprised 47 subjects (mean age 16.30 ± 1.06 years) having been treated with a nonextraction protocol and presenting moderate crowding at pretreatment. For retention, all patients were instructed to use a mandibular Hawley retainer for 12 months, and wear time was documented every 3 months during a posttreatment period of 6 months using TheraMon software. These individuals were divided into two groups. Those who adhered to a wear time equal to or more than 12 h/day (group 1A; N = 17) and those who complied for less than 12 h/day (group 2A; N = 30) were compared with respect to changes of the mandibular arch during the first 6 months of retention. Furthermore, a subgroup of 28 patients who completed a 12-month follow-up period were again divided into two groups: the individuals in group 1B (N = 12) adhered to a wear time equal to or more than 8 h/day, while those in group 2B (N = 16) complied for less than 8 h/day. Little's Irregularity Index, intercanine and intermolar widths, arch length, overjet, and overbite were measured on mandibular models taken at pretreatment (T0) and posttreatment (T1), as well as 6 months (T2) and 12 months (T3) after debonding. Pearson correlation test, independent samples t‑test, and Mann-Whitney U test were used for statistical evaluation.

RESULTS

From T1 to T2, group 1A and group 2A showed a significant relapse in intermolar width with a difference in the median value of 0.38 mm (p = 0.019). At the complete 12-month follow-up, the increase in Little's irregularity score was significantly greater in group 2B (2.54 ± 1.29 mm) than in group 1B (1.32 ± 1.03 mm; p = 0.012). The established wear time measurements showed significant negative correlations with the Little's irregularity score and overjet changes between T1 and T3 (p < 0.05).

CONCLUSIONS

The results emphasized that the use of a retainer should not fall below a level of at least 8 h/day.

摘要

目的

本研究旨在通过使用微传感器进行佩戴时间分析，揭示霍利保持器的平均佩戴时间与长期下颌牙弓稳定性之间可能存在的相关性。

方法

这项纵向回顾性研究纳入了47名受试者（平均年龄16.30±1.06岁），他们接受了不拔牙矫治方案，治疗前存在中度牙列拥挤。为了保持疗效，所有患者均被要求佩戴下颌霍利保持器12个月，并在6个月的治疗后期间，每隔3个月使用TheraMon软件记录佩戴时间。这些个体被分为两组。将每天佩戴时间等于或超过12小时的患者（1A组；N = 17）和每天佩戴时间少于12小时的患者（2A组；N = 30）在保持治疗的前6个月内下颌牙弓的变化进行比较。此外，对完成12个月随访期的28名患者亚组再次分为两组：1B组（N = 12）的个体每天佩戴时间等于或超过8小时，而2B组（N = 16）的个体佩戴时间少于8小时。在治疗前（T0）、治疗后（T1）以及去除矫治器后6个月（T2）和12个月（T3）时获取的下颌模型上测量了Little不规则指数、尖牙间和磨牙间宽度、牙弓长度、覆盖和覆合。采用Pearson相关检验、独立样本t检验和Mann-Whitney U检验进行统计学评估。

结果

从T1到T2，1A组和2A组的磨牙间宽度均出现显著复发，中位数差值为0.38毫米（p = 0.019）。在完整的12个月随访中，2B组（2.54±1.29毫米）的Little不规则评分增加显著大于1B组（1.32±1.03毫米；p = 0.012）。既定的佩戴时间测量结果显示，与T1和T3之间的Little不规则评分和覆盖变化存在显著负相关（p < 0.05）。