Lew K
Eur J Orthod. 1989 Nov;11(4):375-81. doi: 10.1093/oxfordjournals.ejo.a036009.
Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary protrusion were treated with the Begg appliance following extraction of four first premolars. A cephalometric study was undertaken to determine the soft tissue changes in lip profile following treatment. Results show that the upper incisors were retracted by 5.6 mm +/- 0.8 mm and the lower incisors by 4.4 +/- 0.8 mm on the average. The nasolabial angle became more obtuse increasing from 80.7 degrees to 90.7 degrees. The upper lip and lower lip lengthened by 1.9 mm and 1.2 mm, respectively. The lower lip to 'E' line reduced from 7.5 mm to 3.7 mm. All the previous changes were statistically significant (p less than 0.01). The upper lip to upper incisor retraction was 1:2.2 while the lower lip to lower incisor retraction was 1:1.4. The correlation coefficients (r) were 0.72 (p less than 0.01) and 0.80 (p less than 0.01), respectively. The changes in the cants of mandibular and occlusal planes were statistically insignificant. This study shows that the Begg appliance has the ability to significantly reduce bimaxillary protrusions and thereby improve facial aesthetics.
32名年龄在18至26岁之间的成年东方患者因双颌前突前来寻求治疗，在拔除四颗第一前磨牙后采用Begg矫治器进行治疗。进行了一项头影测量研究，以确定治疗后唇部轮廓的软组织变化。结果显示，平均而言，上切牙后移5.6毫米±0.8毫米，下切牙后移4.4±0.8毫米。鼻唇角变得更加钝圆，从80.7度增加到90.7度。上唇和下唇分别延长了1.9毫米和1.2毫米。下唇至“E”线从7.5毫米减少到3.7毫米。所有上述变化均具有统计学意义（p小于0.01）。上唇与上切牙的后移比例为1:2.2，而下唇与下切牙的后移比例为1:1.4。相关系数（r）分别为0.72（p小于0.01）和0.80（p小于0.01）。下颌平面和咬合平面的倾斜度变化无统计学意义。本研究表明，Begg矫治器有能力显著减少双颌前突，从而改善面部美观。
