LONG TERM RESULTS ON THE CORRECTION OF PROGENIA-COPARISON OF SURGERIES, ONE-JAW VS TWO-JAW

早衰矫正的长期结果-单颌手术与双颌手术的比较

• 批准号: 11672009
• 负责人: TSURUKI Takashi
• 金额: $ 1.47万
• 依托单位: TOKYO DENTAL COLLEGE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11672009/
• 关键词: sagittal splitting method (one-jaw); two-jaw surgery; comparison of post-operative stability; long term result; post-operative stability of jaw; relapse; progenia; lateral cephalometric radiogram; 上下顎移動術; 顎矯正手術

The purpose of this study is to evaluate the stability and to observe the factors related to relapse of maxillo-and/or mandibular positioning. The subjects of 25 Japanese adults were divided into two groups. On one group, diagnosed as progenia, the retropositiong of mandible by sagittal splitting method was performed (one-jaw n=13). On the other group, diagnosed as slight retromaxillism and progenia, the advancement of maxilla by Le Fort I osteotomy, retropositioning of mandible by sagittal splitting method was performed (two-jaw n=12).The lateral cephalometric radiograms were taken at the following periods : preoperative (T1), postoperative 6 weeks (T2), 6 months (T3) and more than 2 years (T4) after surgery.Results1.The significant difference between 2 groups were observed at the pre-operative morphology of dento-facial complex.2.Morphological changes by operation ; retropositioning of mandible at the point of B (X) was 8.67mm (one-jaw), 6.19mm (two-jaw), (advancement of maxilla at the point of ANS (X) was 1.73mm, total amount of movement (X) was 7.92mm (two-jaw). As to the amount of movement of mandible on the X axis the one-jaw group is significantly larger than the two-jaw group.3.The relapse rate for long term (T2-T1/14-T2) at the angle of SNB was 11.6% (one-jaw), and 4.1% (two-jaw), at the angle of SNA was 9.1% (two-jaw).4.Significant difference on each group was observed at the point B (X), over jet (one-jaw), over jet (two-jaw).5.Significant difference between two groups was observed at the point B (X), U1 and L1.SummaryLess relapse was observed in the two-jaw-group than in the one-jaw group.Both skeletal and dental stability after surgery was better in the two-jaw group.

本研究的目的是评估上颌和/或下颌定位的稳定性，并观察与复发相关的因素。研究对象为25名日本成年人，分为两组。其中一组诊断为子孙，采用矢状劈开法后移下颌骨(单颌n=13)。另一组诊断为轻度颌后畸形和先天畸形，采用Le Fort I截骨法上颌骨前移，下颌骨矢状劈开后移12例，分别于术前(T1)、术后6周(T2)、6个月(T3)和2年以上(T4)拍摄头颅侧位X线片。B(X)点下颌骨后移8.67 mm(单颌)，6.19 mm(双颌)，上颌骨前移1.73 mm(X)，总活动量(X)7.92 mm(双颌)。下颌骨在X轴上的移动量，单颌组明显大于双颌组。3.远期(T2-T1/14-T2)SNB角复发率为11.6%，SNA角复发率为9.1%，SNA角复发率为4.1%。B(X)点、U1点和L1点两组间差异有统计学意义(P<0.05)。结论：双颌组复发率低于单颌组，术后骨骼稳定性和牙齿稳定性均优于单颌组。