无托槽隐形功能矫治器治疗青少年骨性Ⅱ类错牙合的疗效分析

Effect of invisible functional appliance in the treatment of skeletal Class Ⅱ malocclusion in adolescents

目的观察生长发育期骨性Ⅱ类错牙合采用无托槽隐形功能矫治器治疗前后颅颌面软硬组织的变化并探讨其矫治机制。方法22例通过采用无托槽隐形功能矫治器治疗的青少年患者(男9例,女13例,平均年龄11.2岁),将其治疗前后的头颅侧位片进行测量并统计分析。结果矫治后ANB角、NA⁃PA、TUL⁃E线、TLL⁃E线减小,覆盖变浅,SNB角、U1⁃L1、Go⁃Gn、Cd⁃Go、ANS⁃Me、ANS⁃Me/N⁃Me、Z角、Cm⁃Sn⁃Ls角、FH⁃N′Pg′角明显增加,同时有S⁃Go、Ar⁃Go的代偿性生长。结论无托槽隐形功能矫治器能有效促进下颌骨的生长发育,改善上下颌间关系,但不会导致下颌顺时针旋转引起下颌平面角的增加。

Objective To observe the changes of craniomaxillofacial soft and hard tissues before and after the treatment of skeletal ClassⅡmalocclusion with invisible functional appliance in adolescents,and to explore its correction mechanism.Methods Lateral cephalometric films of 22 adolescent patients(9 males,13 females,average age 11.2 years)who were treated with the invisible func⁃tional appliance were measured and statistically analyzed before and after treatment.Results The difference was significant,such as the ANB,NA⁃PA,overjet.TUL⁃E and TLL⁃E were decreased and the SNB,U1⁃L1,Go⁃Gn,Cd⁃Go,ANS⁃Me,ANS⁃Me/N⁃Me,Z angle Cm⁃Sn⁃Ls,FH⁃N′Pg′,S⁃Go and Ar⁃Go were increased.Conclusion The invisible functional appliance can effectively promote the growth and development of the mandible and improve the relationship between the maxilla and mandible,but it will not lead to the increase of mandibular plane angle due to clockwise rotation of the mandible.