正畸治疗前牙开颌畸形：保持 10 年后的稳定性。

Orthodontic treatment of anterior open-bite malocclusion: stability 10 years postretention.

机构信息

Private Practice, Kennewick, WA, USA.

出版信息

Am J Orthod Dentofacial Orthop. 2010 Mar;137(3):302.e1-8; discussion 302-3. doi: 10.1016/j.ajodo.2009.06.020.

DOI:10.1016/j.ajodo.2009.06.020

PMID:20197159

Abstract

INTRODUCTION

The postretention stability of open-bite treatment is a controversial topic in orthodontics.

METHODS

In this study, the lateral cephalometric radiographs of 64 patients treated with orthodontics alone were evaluated to determine the amount of postretention change. The mean postretention interval was 14 years. The sample was divided into 3 groups based on the amounts of pretreatment overbite: (1) the contact group (n = 24), incisal overlap and incisal contact; (2) the overlap group (n = 25), incisal overlap and no incisal contact; and (3) the open-bite group (n = 15), no incisal overlap. The headfilms were digitized, and the values were analyzed.

RESULTS

The 3 groups reacted differently. During the postretention period, mean overbite deepened in all groups, with the contact group deepening significantly more than the open-bite group. Overjet increased significantly more in the open-bite group than in the contact group. Pretreatment overjet correlated mildly with postretention overjet relapse in the open-bite group.

CONCLUSIONS

All 64 subjects had positive incisal overlap at the postretention recall.

摘要

引言

开咬治疗的保持后稳定性在正畸学中是一个有争议的话题。

方法

本研究评估了 64 名仅接受正畸治疗患者的侧位头颅侧位片，以确定保持后变化的程度。平均保持后间隔为 14 年。根据治疗前覆牙合量将样本分为 3 组：（1）接触组（n = 24），切牙重叠和切牙接触；（2）重叠组（n = 25），切牙重叠但无切牙接触；（3）开咬组（n = 15），无切牙重叠。对头影进行数字化，并分析其值。