Diels R M, Kalra V, DeLoach N, Powers M, Nelson S S
Department of Orthodontics, Case Western Reserve University, School of Dentistry, Cleveland, OH 44106-4905, USA.
Angle Orthod. 1995;65(4):285-92. doi: 10.1043/0003-3219(1995)065<0285:CISTPO>2.0.CO;2.
The purpose of this investigation was to determine changes in soft tissue profile of African-Americans following orthodontic treatment involving extraction of four premolars. The sample consisted of pretreatment and postreatment lateral cephalometric radiographs of 30 males and 30 females of African-American descent exhibiting bimaxillary protrusion. The age of the patients ranged between 10 years 4 months and 17 years 6 months at the start of treatment. Average time between pretreatment and postreatment radiographs was 2 years 11 months in the male group and 3 years 3 months in the female group. Changes in the dentofacial complex and facial soft tissue as a result of treatment and growth were evaluated with cephalometric analysis. Student's t-tests were performed to compare differences. Nasolabial angle increased 9.1 degrees in males and 7.1 degrees in females. Upper lip procumbency relative to SnPg' decreased 1.5 mm in males and 1.7 mm in females. Lower lip retraction relative to SnPg' was 2.7 mm in males and 2.5 mm in females.
本研究的目的是确定非裔美国人在拔除四颗前磨牙的正畸治疗后软组织侧貌的变化。样本包括30名患有双颌前突的非裔美国男性和30名非裔美国女性治疗前和治疗后的头颅侧位X线片。治疗开始时患者年龄在10岁4个月至17岁6个月之间。男性组治疗前和治疗后X线片的平均间隔时间为2年11个月，女性组为3年3个月。通过头影测量分析评估治疗和生长导致的牙颌面复合体及面部软组织的变化。采用学生t检验比较差异。男性鼻唇角增加9.1度，女性增加7.1度。相对于SnPg'，男性上唇前突减少1.5毫米，女性减少1.7毫米。相对于SnPg'，男性下唇后缩2.7毫米，女性后缩2.5毫米。
