摘要
目的骨性Ⅱ类错患者采用单期或双期矫治,比较这两种矫治方案的疗效。方法选择骨性Ⅱ类错患者30例,以下颌后缩为主,深覆Ⅱ°以上,∠ANB>5°,磨牙为远中关系,其中15例,恒牙期直接采用直丝弓矫治器矫治;15例在混合牙列期或恒牙早期,Ⅰ期用Twin-Block功能矫治器矫治,Ⅱ期再用直丝弓矫治器矫治。每位患者均拍摄治疗前后头颅定位侧位片和全景片,以X线头影测量方法评价疗效。结果双期矫治后,SNB角增加、下颌体长度(Go-Pg)、下颌升支(Go-Co)和软组织面角均增加,ANB角和H角减小,以上变化有极显著性差异(P<0.01),而单期矫治后以上变化均无显著性差异(P>0.05)。结论无论单期和双期矫治,均能使骨性Ⅱ类患者的覆覆盖关系得到明显改善,双期矫治较单期矫治能明显促进患者下颌骨生长,有效改善下颌后缩的面形,使患者面部侧貌得到明显改善。
Objective To compare the dentoalvealar outcomes after one-phase and two-phase orthodontic treatment of skeletal class Ⅱ malocclusions, Methods 30 skeletal class Ⅱ malocclusion patients with mandiblular deficiency were chosen. 15 patients were treated with straight wire appliance in one-phase; 15 patients were treated with Twin-Block and straight wire appliance in two-phase. Cephalograph and panoramic radiographs were taken for each patient before and after treatment. The cephalometric analysis was performed to evaluate the effects. Results After the two-phase treatment,the SNB angle,Go-Pg, Go-Co and the soft-tissue facial angle increased significantly, while the ANB and H angles decreased significantly. But after one-phase treatment, all these changes Were not significant. Conclusion Two-phase treatment can effectively induce forward movement of mandible and improve esthetics on soft tissue profile.
出处
《口腔医学》
CAS
2008年第12期646-648,共3页
Stomatology
