研究成年双颌前突患者拔牙矫治前后软组织鼻唇颏的性别差异及治疗的变化。

选取60例成年双颌前突患者，其中男25例、女35例。拔牙后采用直丝弓矫治技术矫治，对治疗前后的头颅侧位片测量分析，配对及独立样本t检验分析治疗前、治疗后男女患者的软组织鼻唇颏差异，男女性患者治疗前后的变化及两组患者变化的差异。

治疗前女性患者鼻唇角（女86.23°、男91.86°，P= 0.033）及颏沟倾角（女61.03°、男68.19°，P= 0.014），上唇厚度（女8.99 mm、男10.87 mm，P= 0.000），下唇厚（女11.84 mm、男13.59 mm，P= 0.000）及颏厚度（女8.14 mm、男9.37 mm，P= 0.014）均明显小于男性，下唇突度（女7.90 mm、男6.40 mm，P= 0.023）较男性明显。正畸治疗后两组患者鼻唇角、颏沟倾角及颏厚度无明显差异；女性上唇长度（女23.25 mm、男25.06 mm，P= 0.001），下唇长度（女46.33 mm、男49.66 mm，P= 0.004）及上唇厚度（女10.98 mm、男13.58 mm，P= 0.000），下唇厚度（女12.31 mm、男14.39 mm，P= 0.000）均明显小于男性，下唇突度（女3.90 mm、男2.50 mm，P= 0.013）较男性明显。男女患者治疗后面型角、鼻唇角、颏沟倾角、上唇厚、颏厚度均明显增加，H角及上下唇突度均明显减小。男性患者上唇长度明显增加。男女性患者治疗前后的变化量及变化趋势均无明显差异。

成年男女性双颌前突患者治疗前后软组织鼻唇颏关系均存在性别差异。正畸治疗对男女性患者的疗效是一致的，可明显改善侧貌突度和鼻唇颏关系的协调性，但不能消除软组织本身的性别差异。

To investigate the difference in the nose-lip-chin relationship of adult males and females with bimaxillary protrusion before and after orthodontic treatment as well as the difference between genders.

Sixty adult patients with bimaxillary protrusion, including 25 males and 35 females, were treated with straight wire technique, and cephalometrics were taken subquently. The difference in the nose-lip-chin relationship before and after treatment, and that between males and females were compared using paried and independent sample t test.

The NLA (female vs male: 86.23° vs 91.86°, P= 0.033) , Pog′B′-FH (61.03° vs 68.19°, P= 0.014) , UL-U1 (8.99 mm vs 10.87 mm, P= 0.000) , LL-L1 (11.84 mm vs 13.59 mm, P= 0.000) and Pos′-Pos (8.14 mm vs 9.37 mm, P= 0.014) in females were statistically less than males. while LL-E (7.90 mm vs 6.40 mm, P= 0.023) was larger than males before treatment. After treatment, there was no difference in FCA, NLA, Pog′B′-FH and Pog′-Pog between males and females. The length and thickness of upper and lower lips were substantially less in females than that in males, while LL-E (3.90 mm vs 2.50 mm, P= 0.013) of females was larger than males. Both males and females had the same changes in FCA, NLA, H angle, Pog′B′-FH, UL-U1, Pog′-Pog, UL-E and LL-E after treatment, without significant difference between genders.

There was sexual difference in the nose-lip-chin relationship before and after treatment. Substantial treatment changes were observed both in males and females, and orthodontic treatment can improve the facial profile and the harmony of nose-lip-chin relationship.