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目的试探讨可用于判别手术与非手术治疗安氏Ⅲ类错畸形患者替牙期颅面牙特征的方法。方法早期治疗组为28例替牙期解除前牙反的安氏Ⅲ类错畸形患者(男性16例,女性12例),替牙期拍摄头颅侧位片的平均年龄为(9.1±1.4)岁,在恒牙期采用非拔牙矫治。手术治疗组为21例随生长发育成为严重骨性安氏Ⅲ类错畸形患者(男性12例,女性9例),替牙期拍摄头颅侧位片的平均年龄为(10.0±2.0)岁,最终接受正颌手术治疗。结果早期治疗组与手术治疗组上下齿槽座点连线与下颌平面的夹角(AB-MP)分别为65.1°和61.2°,差异有统计学意义(P<0.05);上颌切牙长轴与上下齿槽座点连线的夹角(U1-AB)分别为23.1°和27.3°,差异有统计学意义(P<0.05)。结论个体指数(IS)=0.164×(AB-MP)-0.15×(U1-AB)-6.675。当安氏Ⅲ类错畸形患者的IS>0时,其较适合在替牙期进行早期矫治;IS<0,患者更适合进行手术矫治。
Objective To explore the method that can be used to distinguish the characteristics of operative and nonoperative surgical treatment of Angle Ⅲ malocclusion patients. Methods The early treatment group was 28 patients with Angle Class Ⅲ malocclusion (16 males and 12 females) who had antegrade ankle denticulation and the average age of cephalometric films was (9.1 ± 1.4) ) Years old, non-extraction treatment in permanent dentition. The surgical treatment group consisted of 21 patients (12 males and 9 females) with severe skeletal Class Ⅱ malocclusion according to their growth and development. The average age of the cephalometric slices was (10.0 ± 2.0) years old, Finally accepted orthognathic surgery. Results The angle between the upper and lower alveolar locus and the mandibular plane (AB-MP) in the early treatment group and the surgical treatment group was 65.1 ° and 61.2 °, respectively, with significant difference (P <0.05). The maxillary incisor long axis (U1-AB) were 23.1 ° and 27.3 °, respectively, with significant difference (P <0.05). Conclusion Individual index (IS) = 0.164 × (AB-MP) -0.15 × (U1-AB) -6.675. When Class III malocclusion patients with IS> 0, it is more suitable for early correction of dentition; IS <0, the patient is more suitable for surgical correction.