论文部分内容阅读
目的探讨经正畸-正颌联合治疗的骨性Ⅲ类错畸形患者在矫治前和手术后不同时期颌面部硬组织角度的变化,评估治疗效果的长期稳定性。方法选取24例骨性Ⅲ类错畸形患者,在矫治前(T0),正颌手术后3个月(T1)、术后1年(T2)和术后3年(T3)拍摄X线头颅定位侧位片,测量反映颌面部硬组织变化的16项角度指标,比较矫治前和正颌手术后不同时期这些指标的变化情况。结果1)T1与T0的比较:除N-S-Ar、N-S-Ba、N-S-Go、NBa-PtGn以及Y轴角的变化很小,其差异无统计学意义外(P>0.05),其余11项指标的变化均有统计学意义(P<0.05)。2)T2与T1的比较:SNPo、U1-SN的变化有统计学意义(P<0.05),其余指标的变化均无统计学意义(P>0.05)。3)T3与T1的比较:仅U1-SN变化明显(P<0.05)。4)T3与T2的比较:所有测量项目的变化均很轻微,其差异均无统计学意义(P>0.05)。结论经正畸-正颌联合治疗后,骨性Ⅲ类错畸形患者的硬组织测量角度在术后3个月到术后1年期间即术后正畸治疗阶段存在一定程度的变化,但并未对手术效果产生根本影响。
Objective To investigate the changes of maxillofacial hard tissue angle before and after orthodontic - orthognathic surgery in patients with skeletal Class Ⅲ malocclusion and to evaluate the long - term stability of the therapeutic effect. Methods Twenty - four patients with skeletal Class Ⅲ malocclusion were selected and the X - ray skull was taken before T0, 3 months after orthognathic surgery (T1), 1 year after surgery (T2) and 3 years after operation (T3) The lateral radiographs of the maxillofacial region were measured. Sixteen angle indexes were measured to reflect the changes of hard tissue in the maxillofacial region. The changes of these indexes before and after orthognathic surgery were compared. Results 1) Comparison between T1 and T0: There was no significant difference between NS-Ar, NS-Ba, NS-Go, NBa-PtGn and Y axis (P> 0.05) Changes in indicators were statistically significant (P <0.05). 2) Comparison of T2 and T1: The changes of SNPo and U1-SN were statistically significant (P <0.05), and the other indexes had no statistical significance (P> 0.05). 3) Comparison of T3 and T1: Only U1-SN changed significantly (P <0.05). 4) Comparison of T3 and T2: The changes of all the measurement items are very slight, the difference was not statistically significant (P> 0.05). Conclusion After orthodontic-orthognathic surgery, the measurement of hard tissue in patients with skeletal Class Ⅲ malocclusion has a certain degree of change in the orthodontic treatment period from 3 months after operation to 1 year after operation. Did not have a fundamental effect on the surgical results.