摘要
【目的】探讨Twin-block功能矫治器治疗安氏Ⅱ类1分类错牙合所引起的牙、牙槽、颌骨以及软组织的改变。【方法】对16例处于生长发育期且以下颌后缩为主的安氏Ⅱ类1分类错牙合患者进行Twin-block功能矫治,并对其治疗前后软硬组织X线头影测量值进行比较及统计学检验。【结果】治疗后,下颌生长朝着有利的方向发生改变,覆盖、覆牙合分别减少8.13mm及4.27mm,SNB、下颌平面角、Ar-Pog及下面高分别增加1.70°、3.47°、4.06mm及2.53mm,均具有显著性差异。此外,上颌前牙冠有舌向转矩的趋势(P>0.05),鼻唇角有所增加,上唇突度亦减小(P<0.01)。下切牙与下颌平面夹角有少许减小,虽无显著性差异,但对于评价治疗后的下前牙段的稳定性是有意义的。【结论】Twin-block矫治器对安氏Ⅱ类1分类具有矫形作用,可以诱导下颌功能性前移,抑制上颌生长,同时使得上下颌牙及牙槽骨发生改变,从而协调上下颌关系,改善面型。
[Objective] To evaluate the dento-alveolar, skeletal and soft tissue changes caused by Class Ⅱ division 1 malocclusion correction in the patients treated with Twin-block appliance. [Methods] Sixteen patients in growth with Angle Class Ⅱ division 1 malocclusion and mainly with mandibular retrognathia were investigated. Lateral cephalometric X-ray was taken, and skeletal, dento-alveolar and soft fissure measurements were carried out before and after treatment for each patient. Two time-points of results were compared and submitted to statistical analysis. [Results] Changes were occurred for the growth direction and length of mandible after treatment. Overjet and overbite were decreased by 8.13 mm and 4.27 ram, respectively, while SNB, mandibular plane angle, Ar-Pog and lower facial height were increased by 1.70° and 3.47°, 4.06 mm and 2.53 mm, respectively. The maxillary incisors has a tendency of lingual torque （P 〉0.05）, without advancement of point A, which contributes to an increased degree of nasal-labial angle and decreased protrusion of upper lip （P〈 0.01）. In addition, the inclination of lower incisors decreased slightly, although with no statistical significance, it was important to evaluate the stability of the lower anterior segment after treatment. [Conclusions] Twin-block functional appliance possesses the orthopedic effect on Angle Class Ⅱ division 1 malocclusion. When repositioning the mandible forward, it creates the force to limit maxillary growth forward as well. Simultaneously it causes the changes of dento-alveolar. All these aspects contribute to a harmonious relationship of upper and lower jaws and a better profile.
出处
《中山大学学报（医学科学版）》
CAS
CSCD
北大核心
2005年第5期566-569,共4页
Journal of Sun Yat-Sen University:Medical Sciences
基金
广东省科技计划项目(2004B30901008)
