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目的:评价改良式平导矫治恒牙期安氏Ⅱ1S错的疗效。方法:恒牙期安氏Ⅱ1S错患者30例,分成两组,分别采用普通平导和改良平导技术矫治,观察其打开咬合时间、后牙稳定性、前牙唇倾情况并作X线头影测量分析,评价两种方法的矫治效果。结果:两组矫治后SNA、SNB、ANB和UI-SN与术前比较,差异均有显著性(P<0.05)。改良平导组矫治后SNA、SNB、ANB和UI-SN与普通平导组矫治后比较,差异均有显著性(P<0.05)。改良平导组打开咬合时间明显短于普通平导组。结论:改良式平导可加强上颌后牙支抗,显著改善了覆,提高了安氏Ⅱ1S错正畸效果。
OBJECTIVE: To evaluate the effect of modified flat guide on the treatment of Angle Ⅱ 1S malocclusion in permanent dentition. Methods: Thirty patients with AngleⅡ1S malocclusion in permanent dentition were divided into two groups. They were treated with ordinary flat guide and modified flat guide technique respectively. The occlusal time, the stability of posterior teeth and lip incision of anterior teeth were observed. Shadow measurement analysis, evaluation of two methods of correction effect. Results: There were significant differences in SNA, SNB, ANB and UI-SN between the two groups before and after treatment (P <0.05). There was significant difference (P <0.05) in SNA, SNB, ANB and UI-SN between the modified group and the normal group after correction. Improved flat lead group open bite time was significantly shorter than normal lead group. CONCLUSION: The modified guide can enhance the maxillary posterior teeth, significantly improve the coverage and improve the Angle Ⅱ 1S wrong orthodontic effect.