Wang Huijuan, Jiang Li, Yi Yating, Li Huang, Lan Tingting
Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China.
Department of Orthodontics, Sichuan Hospital of Stomatology, Chengdu, China.
Ann Transl Med. 2022 Feb;10(4):163. doi: 10.21037/atm-22-135.
To detect parameters associated with the craniomaxillofacial system that could be altered during hyperdivergent skeletal class II malocclusion camouflage treatment for better profile improvement.
Forty-two subjects with hyperdivergent skeletal class II malocclusion who had finished their orthodontic treatments and achieved good soft tissue responses were included in this study. Cephalometric analyses of these patients were taken before (T1) and after (T2) treatment. Measurements were made at each treatment stage and analyzed within and between groups.
No obvious decrease in the cant of occlusal plane (OP) (the line of point L1 and point L7) and mandibular plane (MP) was observed. However, an obvious decrease in the cant of the posterior occlusal plane (POP) and the angle of plane NA and plane NB (ANB) and a significant increase in the distance from the condylar center (Dc) to OP (DPO) were observed in the subjects (P<0.05).
Decreased POP canting and increased DPO values play a vital role in profile improvement. Sagittal discrepancies might be considerably alleviated by a decreasing ANB angle [especially the sella nasion A point (SNA) angle]. Therefore, to attain a successful camouflage treatment of hyperdivergent skeletal class II malocclusion, treatment should be targeted towards finding an alternative to control POP canting, including reducing crowding in the posterior arch, as well as modifying and intruding molars to an upright and lower position.
检测与颅颌面系统相关的参数，这些参数在高度分散型骨性II类错牙合掩饰性治疗期间可能会发生改变，以实现更好的侧貌改善。
本研究纳入了42例完成正畸治疗并取得良好软组织反应的高度分散型骨性II类错牙合患者。在治疗前（T1）和治疗后（T2）对这些患者进行头影测量分析。在每个治疗阶段进行测量，并在组内和组间进行分析。
未观察到咬合平面（OP）（L1点与L7点连线）和下颌平面（MP）的倾斜度有明显降低。然而，观察到受试者的后牙咬合平面（POP）倾斜度、平面NA与平面NB的夹角（ANB）明显降低，髁突中心（Dc）到OP的距离（DPO）显著增加（P<0.05）。
POP倾斜度降低和DPO值增加在侧貌改善中起重要作用。矢状向差异可能通过减小ANB角[尤其是蝶鞍鼻根点A角（SNA）]得到显著缓解。因此，为成功掩饰治疗高度分散型骨性II类错牙合，治疗应致力于找到控制POP倾斜度的替代方法，包括减少后牙弓拥挤，以及将磨牙改形并压低至直立和更低位置。
