Miyazaki H, Motegi E, Yatabe K, Isshiki Y
Department of Orthodontics, Tokyo Dental College, Tokyo, Japan.
Am J Orthod Dentofacial Orthop. 1998 Nov;114(5):530-7. doi: 10.1016/s0889-5406(98)70173-8.
In this study we compared the posttreatment stability of occlusion in adults and adolescents treated for crowding or maxillary protrusion with four-premolar extractions and edgewise mechanics at an average of more than 4 years out of treatment. The adolescent sample showed a significantly greater posttreatment increase in mandibular anterior crowding than the adult sample. Posttreatment overjet and overbite remained more stable in the adolescents. We noted a correlation between in-treatment expansion and posttreatment narrowing of mandibular intercanine width in the adults. Differences in postorthodontic occlusal changes were noted between the adult and adolescent samples.
在本研究中，我们比较了接受四颗前磨牙拔除及方丝弓矫治技术治疗牙列拥挤或上颌前突的成人和青少年在平均超过4年的治疗结束后的咬合后稳定性。青少年样本在下颌前牙拥挤方面的治疗后增加幅度显著大于成人样本。青少年的治疗后覆盖和覆合保持得更稳定。我们注意到成人治疗期间下颌尖牙间宽度的扩展与治疗后变窄之间存在相关性。在成人和青少年样本之间观察到正畸治疗后咬合变化的差异。
