Soydan S S, Uckan S, Ustdal A, Bayram B, Bayrak B
Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Baskent University, Ankara, Turkey.
J Oral Rehabil. 2014 Nov;41(11):816-21. doi: 10.1111/joor.12203. Epub 2014 Jun 19.
The effect of orthodontic-surgical treatment on submental-cervical region was evaluated in a very limited number of studies. The aim of this study was to evaluate submental-cervical soft tissue contour changes following mandibular advancement and set-back procedures via bilateral sagittal split ramus osteotomy. Sixty-seven patients were included in this study. Group 1 consisted of 27 skeletal Class II patients who underwent mandibular advancement surgery, whereas Group 2 consisted of 40 skeletal Class III patients who underwent mandibular set-back surgery. Various linear and angular measurements were performed on pre-operative and sixth month post-operative cephalometric radiographs. A new method was used to evaluate the amount of sagging at submental region. The submental length did not change in Group 1; however, it decreased significantly in Group 2 (P < 0·05). The angle between submental plane and facial plane decreased to 95·9° from 98·8° in Group 1(P < 0·05), whereas it increased to 93·1° from 88·2° in Group2 (P < 0·05). The change of submental soft tissue sag was almost stable in Group 1, while 0·34 mm increase of sag was observed in Group 2. This increase was not statistically significant (P > 0·05). Mandibular set-back and advancement procedures do not remarkably change the submental sag following approximately 6 mm jaw movement. Although mandibular advancement did not significantly effect submental length, soft tissue followed mandibular set-back with a ratio of 1:1 at C-point to projection of soft tissue pogonion and 1:0·7 at C-point to soft tissue menton distances.
在非常有限的研究中评估了正畸-外科治疗对颏下-颈部区域的影响。本研究的目的是通过双侧矢状劈开下颌升支截骨术评估下颌前徙和后退手术后颏下-颈部软组织轮廓的变化。本研究纳入了67例患者。第1组由27例接受下颌前徙手术的骨性II类患者组成，而第2组由40例接受下颌后退手术的骨性III类患者组成。在术前和术后6个月的头颅侧位片上进行了各种线性和角度测量。采用一种新方法评估颏下区域的下垂量。第1组的颏下长度没有变化；然而，第2组的颏下长度显著缩短（P<0.05）。第1组中颏下平面与面部平面的夹角从98.8°降至95.9°（P<0.05），而第2组中该夹角从88.2°增至93.1°（P<0.05）。第1组颏下软组织下垂的变化几乎稳定，而第2组观察到下垂增加了0.34mm。这种增加没有统计学意义（P>0.05）。在颌骨移动约6mm后，下颌后退和前徙手术不会显著改变颏下下垂。尽管下颌前徙对颏下长度没有显著影响，但软组织在C点至软组织颏前点投影处以下颌后退与软组织颏下点距离的1:1比例、在C点至软组织颏下点距离处以下颌后退与软组织颏下点距离的1:0.7比例跟随下颌后退。
