Azumi Yuko, Sugawara Junji, Nagasaka Hiroshi, Kawamura Hiroshi
Division of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Tohoku University, Sendai, Japan.
World J Orthod. 2007 Fall;8(3):221-31.
Two patients with telescopic bites due to narrow mandibular arches were treated by mandibular widening and mandibular lengthening with intraoral distraction osteogenesis. Both patients underwent distraction osteogenesis surgery successfully, without any complications. The amount of widening in the 2 cases was 6 mm and 5 mm, and the intercanine distance increased by 2.1 mm and 4.9 mm, respectively. Nonextraction orthodontic treatment was performed after removal of the distraction devices in both cases. The postsurgical orthodontic treatment periods of the 2 cases were 13 months and 7 months, respectively. Eventually, functional occlusions and good profiles were obtained in both cases. Although both patients complained of temporomandibular joint symptoms at the first consultation, those symptoms were improved after treatment. At 3 years after debonding, dentofacial relapse was negligible. In conclusion, mandibular widening by intraoral distraction osteogenesis appeared to be an effective modality for correcting telescopic bites.
两名因下颌弓狭窄导致套叠咬合的患者接受了下颌扩弓和下颌延长术,并采用口内牵张成骨技术。两名患者均成功接受了牵张成骨手术,无任何并发症。2例患者的扩弓量分别为6mm和5mm,尖牙间距离分别增加了2.1mm和4.9mm。两例患者在拆除牵张装置后均进行了不拔牙正畸治疗。两例患者术后正畸治疗时间分别为13个月和7个月。最终,两例患者均获得了功能性咬合和良好的面部外形。尽管两名患者在初诊时均抱怨有颞下颌关节症状,但治疗后这些症状有所改善。在拆除矫治器3年后,牙颌面复发可忽略不计。总之,口内牵张成骨下颌扩弓似乎是矫正套叠咬合的有效方法。