Staggers J A
Department of Orthodontics, Medical College of Georgia School of Dentistry.
Am J Orthod Dentofacial Orthop. 1994 Jan;105(1):19-24. doi: 10.1016/S0889-5406(94)70095-8.
Orthodontic treatment involving the extraction of first premolars has been implicated in the dental literature as an etiologic factor in the development of temporomandibular joint (TMJ) disorders. Authors have proposed that the extraction of first premolars causes a decrease in the vertical dimension of occlusion. The purpose of this study was to investigate the validity of this claim. Records of 45 Class I, nonextraction cases and 38 Class I, first premolar extraction cases were obtained. The pretreatment and posttreatment cephalographs were digitized, and several cephalometric variables were examined to evaluate the vertical changes occurring as a result of orthodontic treatment. Statistical analysis of the data revealed no significant differences between the vertical changes occurring in the extraction and nonextraction groups. On average, orthodontic treatment in both groups produced an increase in the cephalometric vertical dimensions that were examined.
在牙科文献中，涉及拔除第一前磨牙的正畸治疗被认为是颞下颌关节（TMJ）紊乱症发展的一个病因。作者们提出，拔除第一前磨牙会导致咬合垂直距离减小。本研究的目的是调查这一说法的真实性。获取了45例I类不拔牙病例和38例I类拔除第一前磨牙病例的记录。对治疗前和治疗后的头颅侧位片进行数字化处理，并检查了几个头影测量变量，以评估正畸治疗导致的垂直变化。数据的统计分析显示，拔牙组和不拔牙组的垂直变化之间没有显著差异。平均而言，两组的正畸治疗都使所检查的头影测量垂直距离增加。
