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目的:评估改良斜面导板在前导下颌中的作用。方法:选择12例Ⅱ类Ⅱ分类伴下颌后缩患者,设为第1组,男4例,女8例,平均年龄11岁8个月。先采用上颌固定矫治器纠正上前牙内倾,再采用改良上颌斜面导板前导下颌;同时选择12例Ⅱ类Ⅰ分类伴下颌后缩患者,设为第2组,男5例,女7例,平均年龄11岁6个月,采用Twin-block前导下颌;对2组患者前导下颌的疗效通过治疗前后头颅侧位定位片进行评估、对比,采用SAS6.0软件包对数据进行统计学处理。结果:2组患者下颌均向前生长,第1组下前牙唇向倾斜较第2组明显,但差异无统计学意义(P>0.05);下颌第一磨牙近中向及向的移动,第2组显著大于第1组,差异有统计学意义(P<0.05)。结论:矫治Ⅱ类Ⅱ分类伴下颌后缩的患者,采用改良上颌斜面导板前导下颌不失为一种经济、简化、有效的方法。
Objective: To evaluate the effect of improved bevel guide in the leading mandible. Methods: Twelve cases of type Ⅱ Ⅱ with mandibular retraction were selected and divided into group 1, 4 males and 8 females, with an average age of 11 years and 8 months. At first, 12 cases with type Ⅱ Ⅰ classification and mandibular retrusion were selected and divided into 2 groups: 5 males and 7 females, the mean was The age of 11 years and 6 months, using Twin-block leading mandibular; the leading group of patients with mandibular mandibular curative effect through the treatment before and after the assessment of cephalometric films, compared with SAS6.0 software packages for data processing. Results: The mandibular movement of both groups progressed forward. In Group 1, the inclination of lower anterior lip was significantly more than that of the second group, but the difference was not statistically significant (P> 0.05). The movement of the mandibular first molars in the mesial and distal direction , The second group was significantly greater than the first group, the difference was statistically significant (P <0.05). Conclusion: It is an economical, simple and effective method to correct the mandibular retrusion with maxillary bevel guide plate in the treatment of patients with Class Ⅱclass Ⅱ dislocation.