MRC肌功能矫治器矫治替牙期安氏Ⅱ类错牙合畸形疗效分析

周允芝 马丽琼 唐旭炎

[摘要]目的：肌功能训练矫治器（MRC）矫治替牙期安氏Ⅱ类错牙合畸形疗效分析。方法：选取2015年1月-2019年1月在笔者医院就诊的82例安氏Ⅱ类错牙合畸形患儿，均采用MRC进行治疗。比较治疗前后患儿头影测量结果及前牙覆牙合覆盖情况。结果：与矫治前比较，矫治后侧貌改善明显;硬组织头影测量值SNA、SNB、L1-NB和L1-MP显著升高，ANB、U1-SN和U1-NA显著降低，差异具有统计学意义（P<0.05）;患儿的侧面软组织角度中OE-Prn-Pos角、OE-N'-B'角、OE-N'-Sn角、OE-N'-Pos角、N'-Prn-Pos角以及N'-Sn-Pos角均大于矫治前，Sn-N'-B'角小于矫治前，差异具有统计学意义（P<0.05）;前牙覆牙合、覆盖情况相比于矫治前均显著改善，差异具有统计学意义（P<0.05）。结论：应用MRC功能矫治器可以改善患儿后缩的错牙合畸形，改善患儿的下颌前突侧貌，可在临床上推广使用。

[关键词]肌功能训练器;下颌后缩;错牙合畸形;硬组织;软组织;前牙覆牙合;前牙覆盖

[中图分类号]R783.5    [文献标志码]A    [文章编号]1008-6455（2020）04-0120-03

Abstract： Objective To analysed the curative effect of muscle function training appliance （MRC） muscle functional appliance on Class Ⅱ malocclusion in mixed dentition.  Methods  82 cases of Class II children admitted to our hospital from January 2015 to January 2019 were treated with MRC. Hard tissue cephalometric measurements and soft tissue angle values were measured respectivelybefore and after treatment， and the overbite coverage of anterior teeth was compared. Results Compared with before treatment， the posterior aspect of the treatment was obviously improved. Hard tissue cephalometric values SNA， SNB， L1-NB and L1-MP were significantly increased， while ANB， U1-SN and U1-NA were significantly decreased， with statistically significant differences （P<0.05）. The OE-Prn-Pos angle， OE-N'-B' angle， OE-N'-Sn angle， OE-N'-Pos angle， N'-Prn-Pos angle and N'-Sn-Pos angle in the side soft tissue angle of the child were all larger than before treatment， while Sn-N'-B' angle was smaller than before treatment， the differences were statistically significant （P<0.05）. The situation of overbite and overbite of anterior teeth was significantly improved compared with that before treatment， and the difference was statistically significant（P<0.05）. Conclusion  The application of MRC functional appliance can improve the malocclusion of children with backward contraction and improve the mandibular protrusion profile of children， which is worthy of clinical application.

Key words： muscle function trainer; mandibular retraction; malocclusion; hard tissue; soft tissue; anterior overbite; anterior tooth cover

替牙期是兒童牙齿、颌骨、面颊发育的关键时期，也是儿童生长发育的高峰期。安氏Ⅱ类错牙合是口腔科中儿童常见的牙齿畸形病[1-2]，儿童的发病率极高，其中的50%～60%多是由于下颌后缩引起的[3]。为了治疗这类错牙合畸形，临床上使用各种矫治器进行矫正[4]，目的在于促进患儿下颌生长，引导其下颌向前发育[5]。目前有学者研究显示，肌功能训练矫治器（Myofunctional Research Company， MRC）可以有效矫治安氏Ⅱ类下颌后缩的错牙合畸形，明显改善患者下颌后缩情况。通过测量错牙合畸形后儿童头颅指标，了解儿童前牙覆牙合覆盖情况，以便于使用MRC肌功能矫治器对其进行适当的干预治疗，促进儿童上牙弓的横向发展，有利于儿童构建一个正常的上下颌位置关系，使下颌恢复正常生长发育，现将结果报道如下。

1  资料和方法

1.1 一般资料：选取2015年1月-2019年1月在笔者医院口腔科接受口腔正畸治疗的82例替牙期错牙合畸形患儿为研究对象。……