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目的探讨AngleⅡ错畸形牙弓宽度与下颌骨形态结构之间的关系。方法选择2005—2007年于中国医科大学口腔医学院正畸科就诊的46例AngleⅡ错畸形患者为病例组,22例AngleI错畸形患者为对照组。病例组再按Angle分类法分2组,即AngleⅡ1组29例,AngleⅡ2组17例。对全部患者治疗前石膏模型、X线头颅定位侧位片进行测量,测量结果进行统计学分析。结果 AngleⅡ2错畸形患者的下颌体长度及下颌总长度小于AngleⅡ1及AngleI错畸形患者,差异有统计学意义(P<0.05);AngleⅡ1和AngleⅡ2错畸形患者上颌中、后段牙弓宽度均小于AngleⅠ错畸形患者,上齿槽座点-鼻根点-下齿槽座点角(∠ANB)均大于AngleⅠ错畸形患者,差异均有统计学意义(P<0.05)。结论 AngleⅡ错畸形患者的上颌中、后段牙弓宽度小于AngleⅠ错畸形患者。AngleⅡ1错畸形患者的下颌后缩可能与上颌牙弓狭窄有关;AngleⅡ2错畸形患者的下颌后缩可能与下颌骨的发育不足有关。
Objective To investigate the relationship between the arch width and the morphology of the mandible in Angle Ⅱ malocclusion. Methods A total of 46 cases of Angle Ⅱ malformation deformity patients from orthodontics department of Stomatology Hospital of China Medical University from 2005 to 2007 were selected as the case group and 22 patients with AngleI malformation deformity as the control group. The cases were divided into two groups according to Angle classification, that is, 29 cases in AngleⅡ1 group and 17 cases in AngleⅡ2 group. All patients before treatment gypsum model, X-ray skull positioning lateral radiographs were measured, the measurement results were statistically analyzed. Results The length of the mandibular body and the length of the mandibular jaw in AngleⅡ2 malformation patients were less than those in AngleⅡ and AngleI patients (P <0.05). The dental arch widths in the patients with AngleⅡ1 and AngleⅡ2 malformations were Patients with Angle Ⅰ malocclusion had a statistically significant difference (P <0.05) in Angle I malocclusion patients with upper cusp seat-nasal point-lower alveolar seat angle (∠ANB). Conclusions Angle 错 malformation patients with maxillary midline and posterior segment arch width is smaller than Angle 错 malformation patients. Angle Ⅱ 1 malocclusion patients with mandibular retraction may be related to the maxillary arch stenosis; Angle Ⅱ 2 malocclusion patients with mandibular retraction may be related to the development of mandibular hypoplasia.