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目的探讨安氏Ⅱ~1错上颌单颌拔牙矫治前后咀嚼效率的变化。方法选择2006—2009年在广东省河源市人民医院口腔正畸科就诊的安氏Ⅱ1错患者30例为试验组,采用过筛称重法测量治疗过程中咀嚼效率变化,同时以30名个别正常学生作为对照组,比较咀嚼效率差异。结果矫治后即刻拆除矫治器时的咀嚼效率与矫治前的差异无统计学意义(P>0.05);保持6个月后咀嚼效率明显提高,仅略低于对照组(P>0.05),其与矫治后即刻相比,差异有统计学意义(P<0.05),但与矫治前相比,差异无统计学意义(P>0.05)。结论上颌单颌拔牙矫治安氏Ⅱ1错能改善咀嚼肌功能,经一段时间的适应后咀嚼效率接近正常。
Objective To investigate the changes of masticatory efficiency before and after treatment of Angle Ⅱ ~ 1 malocclusion maxillary single maxillary extraction. Methods Thirty patients with Angle Ⅱ malocclusion in orthopedic department of Heyuan People’s Hospital of Guangdong Province during 2006-2009 were selected as the experimental group. The chewing efficiency in the course of treatment was measured by sieve weighing method. At the same time, 30 individuals Normal students as a control group, compare chewing efficiency differences. Results There was no significant difference in masticatory efficiency between orthodontic appliances and orthodontic appliances before and after orthodontic treatment (P> 0.05). After 6 months of maintenance, the chewing efficiency was significantly increased, only slightly lower than that of the control group (P> 0.05) The difference was statistically significant (P <0.05) immediately after treatment, but there was no significant difference between before and after treatment (P> 0.05). Conclusion Maxillofacial extraction treatment of Angle Ⅱ Ⅱ malocclusion can improve masticatory muscle function, after a period of maneuvering to adapt to the normal efficiency.