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Title: [Orthodonticorthognathic treatment stability in skeletal class III malocclusion patients].
Author: Wang XJ, Zhang YM, Zhou YH.
Journal: Beijing Da Xue Xue Bao Yi Xue Ban; 2019 Feb 18; 51(1):86-92. PubMed ID: 30773550.
Abstract:
OBJECTIVE: To investigate stability of skeletal hard tissues, dental hard tissues and soft tissues after orthodonticorthognathic treatment in a long term. This study reviewed longitudinal changes in orthodontic-orthognathic patients of skeletal class III malocculsion, using lateral cephalometric radiographs in 3-12 years after treatment in comparison to treatment finishing. METHODS: Twenty-two patients with skeletal Class III malocclusion following orthodontic-orthognathic surgery in Peking University School and Hospital of Stomatology from January 1, 2000 to January 1, 2009 were observed. The lateral cephalometric radiographs of the following stages were collected: treatment finishing (T1), 3 to 12 years after treatment (T2). Statistical analyses of cephalometrics were evaluated. Paired student t test was performed by SPSS 17.0. RESULTS: Data of all the 22 patients were studied in longitudinal timeline after treatment and 3-12 years after treatment. From T1 to T2, we evaluated 11-SN (angle between the upper incisors axis and SN plane), 11-NA angle (angle between the upper incisors axis and NA plane), 11-NA mm (perpendicular distance from upper incisors to NA plane), 11-41 (angle between the upper incisors axis and lower incisors axis), 41-NB angle (angle between lower incisors and NB plane), 41-NB (perpendicular distance from lower incisors to NB plane), 41-MP angle (angle between lower incisors and GoGn plane), and IMPA [angle between lower incisor and mandibular plane (tangent line to submandibular border)]. Most hard tissues of the teeth remained stable but upper anterior teeth angulations decreased, indicating by significantly reducing 11-SN (T1: 110.98°±6.77°; T2: 109.21°±5.80°; P=0.005); reducing 11-NA (T1: 28.31°±6.80°; T2: 26.49°±6.18°; P=0.002); increasing 11-41 (T1: 123.51°±8.14°; T2: 125.7°±10.01°; P=0.035). From T1 to T2, we also evaluated SNA (angle of sella-nasion-A-point), SNB (angle of sella-nasion-B-point), ANB (angle of A-point-nasion-B-point), GoGn-SN (angle between GoGn and SN plane), GoGn-FH (angle between GoGn and Frankfort plane), Y axis (angel between Sella-Gn and Frankfort plane), N-ANS (distance from nasion point to ANS point), ANS-Me (distance from ANS point to Menton point), N-Me (distance from nasion point to Menton point), ANS-Me/N-Me% (proportion of ANS-Me to N-Me), and FMA (angle between Frankfort and mandibular plane), Wits appraisal (horizontal distance between points A and B on functional occlusal plane). Skeletal hard tissues also remained relatively stable, only N-Me value changed significantly with a decreasing facial height (T1: 124.98°±11.98°; T2: 122.4°±11.05°; P=0.024). From T1 to T2, we finally evaluated FH-NsPg angle (angle between NsPg and Frankfort plane), H angle (angel between H line and NB), FH-A'UL angle (angle between A'UL and Frankfort plane), FH-B'LL angle (angle between B'LL and Frankfort plane), UL-LL (angle between UL and LL), UL-EP (distance between UL and E line), LL-EP (distance between LL and E line), Sn-H (perpendicular distance between Sn point and H line), Nls-H (distance of nose-lip-sulcus to H line), Li-H (lower lip to H line), Si-H (lower lip sulcus to H line), and NLA (nasolabial angle, angle of Cm-Sn-UL-point). Soft tissues changes were observed in decreasing UL-EP [T1: (-2.78±2.20) mm; (-3.29±2.44) mm; P=0.02] and H angle (T1: 8.27°±3.71°; 7.32°±3.83°; P=0.006). Other soft tissues remained relatively stable by retruding upper lip position and chin changes with no statistical significance. CONCLUSION: Orthodontic-orthognathic treatment can improve esthetics and occlusal function in patients of skeletal class III malocclusion with a stable long-term outcome. 目的: 测量骨性Ⅲ类错牙合畸形患者经过正畸-正颌联合治疗后及治疗结束3~12年软、硬组织的变化, 探讨正畸-正颌联合治疗后颌面部组织的长期稳定性。方法: 回顾2000年1月1日至2009年1月1日就诊于北京大学口腔医院行正畸-正颌联合治疗的骨性Ⅲ类患者22例,收集正畸-正颌联合治疗结束时及3~12年随访复诊的头颅侧位片,测量各牙性硬组织、骨性硬组织及软组织变化的项目。利用SPSS 17.0软件进行配对t检验,P<0.05为差异有统计学意义。结果: 比较联合治疗术后3~12年和治疗结束时的牙性硬组织变化如下:上中切牙-SN角由110.98°±6.77°减少为109.21°±5.80°(P = 0.005),上中切牙-NA角由28.31°±6.80°减少为26.49°±6.18°(P = 0.002),上下切牙角由123.51°±8.14°增大为125.7°±10.01°(P = 0.035), 其余牙性硬组织项目变化均差异无统计学意义,说明联合治疗后3~12年相比联合治疗结束时,患者的上前牙有直立趋势。骨性硬组织变化中全面高由124.98°±11.98°减少为122.4°±11.05°(P = 0.024), 其余骨性硬组织项目变化均差异无统计学意义,提示联合治疗后3~12年骨性硬组织具有相对稳定性。比较联合治疗术后3~12年和治疗结束时的软组织测量值,上唇凸点至EP平面距离由(-2.78±2.20) mm减少为(-3.29±2.44) mm (P = 0.02), H角由8.27°±3.71°减少为7.32°±3.83° (P = 0.006),其余软组织项目变化均差异无统计学意义,上唇和颏部软组织变化表现为上唇少量回缩和颏部形态的少量改变。结论: 骨性Ⅲ类错牙合畸形正畸-正颌联合治疗后3~12年牙性硬组织、骨性硬组织及软组织改变基本稳定。

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