Demir Abdullah, Uysal Tancan, Sari Zafer, Basciftci Faruk Ayhan
Department of Orthodontics, Faculty of Dentistry, Selcuk University, Konya, Turkey.
Eur J Orthod. 2005 Oct;27(5):524-31. doi: 10.1093/ejo/cji046. Epub 2005 Jul 27.
The aims of this study were to determine the changes in the dentofacial structures of Class II division 1 mandibular retrognathic patients treated with bilateral extraction of the upper first premolars, and to compare pre- and post-treatment values with the cephalometric norms of Anatolian Turkish adults. The Class II division 1 subjects included 20 males and 33 females (mean age: 17.08 +/- 1.03 years). All received comprehensive orthodontic treatment using an edgewise appliance and appropriate headgear. Lateral cephalograms were taken at the beginning and end of treatment. Twenty-five (14 linear and 11 angular) measurements were analysed on each radiograph. Each cephalogram was traced and digitized. For statistical evaluation, paired and independent-samples t-tests were performed. When the pre- and post-treatment measurements were compared, statistically significant differences were found for nine of 25 measurements. During treatment the facial axis, U1-SN ( degrees ), U1-NA (mm), U1-NA ( degrees ), H angle and upper lip to E plane measurements decreased, while N-ANS, interincisal angle and upper lip to Steiner S line increased. No statistically significant gender differences were found. Significant improvements were determined in ANS-Me and L1-APo measurements compared with Turkish norms. However, statistically significant deterioration was found in values related to point A, upper incisor and lower lip measurements. The findings demonstrates that camouflage treatment in Class II, mandibular retrognathic subjects has characteristic skeletal, dental and soft tissue effects on the dentofacial complex.
本研究的目的是确定接受双侧拔除上颌第一前磨牙治疗的安氏II类1分类下颌后缩患者牙颌面结构的变化，并将治疗前后的值与安纳托利亚土耳其成年人的头影测量标准进行比较。安氏II类1分类受试者包括20名男性和33名女性（平均年龄：17.08±1.03岁）。所有患者均使用方丝弓矫治器和合适的头帽接受综合正畸治疗。在治疗开始和结束时拍摄头颅侧位片。对每张X线片进行25项（14项线性和11项角度）测量分析。每张头颅侧位片都进行了描图和数字化处理。为进行统计学评估，进行了配对和独立样本t检验。比较治疗前后的测量值时，25项测量中有9项存在统计学显著差异。治疗期间，面轴、U1-SN（度）、U1-NA（毫米）、U1-NA（度）、H角和上唇至E平面的测量值降低，而N-ANS、切牙间角和上唇至Steiner S线的测量值增加。未发现统计学显著的性别差异。与土耳其标准相比，ANS-Me和L1-APo测量值有显著改善。然而，在与A点、上切牙和下唇测量相关的值中发现了统计学显著的恶化。研究结果表明，安氏II类下颌后缩患者的掩饰性治疗对牙颌面复合体有特征性的骨骼、牙齿和软组织影响。
