双侧推磨牙摆式矫治器的临床应用

目的：制作一种双侧推磨牙摆式矫治器，并应用于安氏Ⅱ类错牙合 并伴有牙源性前牙拥挤的患者的治疗。方法：选取15例（男6例，女9例）安氏Ⅱ类错牙合 并伴有牙源性前牙拥挤的患者配戴双侧推磨牙摆式矫治器半年，对矫治前后的头颅侧位片和模型进行测量分析，其测量项目主要包括磨牙远移的距离、磨牙压低的量、磨牙颊舌侧的偏移量、磨牙的近远中倾斜度、U1-SN值以及前牙覆盖量。测量的数据用t检验统计方法 ，并用SPSS17.0软件进行统计学处理。结果：临床观察双侧推磨牙摆式矫治器对安氏Ⅱ类错牙合 并伴有牙源性前牙拥挤的患者疗效显著。统计数据显示：磨牙远移的距离、磨牙压低的量、磨牙颊舌侧的偏移量以及磨牙的近远中倾斜度矫治前后比较差异有统计学意义（P＜0.05）；U1-SN值以及前牙覆盖量矫治前后比较差异无统计学意义（P＞0.05）；不同性别矫治前后比较差异无统计学意义（P＞0.05）。与临床观察基本一致。结论：该双侧推磨牙摆式矫治器治疗安氏Ⅱ类错牙合 并伴有牙源性前牙拥挤的患者，磨牙远移量改变明显，对面高的控制较好，保护了前牙支抗，防止了磨牙的旋转及颊舌侧倾斜，疗效显著且与性别无关。

Clinical application of a double malor distalization pendulum appliance

Objective:To make a double malor distalization pendulum appliance, and apply it in the treatment of children with Angel class Ⅱ malocclusion accompanied by odontogenic crowded anterior teeth .Methods:Fifteen subjects (6 males, 9 females) with Angel classⅡmalocclusion accompanied by odontogenic crowded anterior teeth are selected and asked to wear a double thrust molar pendulum appliance for half a year.Then lateral cephalometric radiograph and models are measured and analyzed before and after the treatment. Measuring project mainly includes:distance of malordistalization, degree of molar intrusion, buccal lingual offset of molar, near far slope of molar, U1-SN value and the cover of front teeth.The measured data are processed by using t test statistical method and SPSS17.0 software statistical processing.Results:Clinical observation shows that double malor distalization pendulum appliance has great effects on the treatment of children with Angel classⅡmalocclusion accompanied by odontogenic crowded anterior teeth.Statistics shows that the difference between distance of malor distalization, degree of molar intrusion, buccal lingual offset of molar, near far slope of molar meaured before and after the treatment is statistically significant (P< 0.05), while that between U1-SN value and the cover of front teeth before and after the treatment is of no statistical significance (P>0.05); Difference between male and female before and after the treatment is also of no statistical significance (P> 0.05). This is consistent with the clinical observation.Conclusion:When this double malor distalization pendulum appliance is applied in the treatment of children with Angel classⅡmalocclusion accompanied by odontogenic crowded anterior teeth the distance ofmolar distalization changes significantly and face height is under better control. Moreover, it protects the front teeth anchorage and prevents the rotation and buccal lingual inclination of the molar. The curative effect is distinct and has nothing to do with gender.