Al-Dawoody Alah-Dawood
BDS, MSc, PhD, MFDSRCPS(Glasg.), MFDRCSI. Assistant professor of Orthodontics, Department of Dentistry. Al-Manara College for Medical Sciences. Mysan, Republic of Iraq.
J Clin Exp Dent. 2022 Dec 1;14(12):e994-e999. doi: 10.4317/jced.60003. eCollection 2022 Dec.
Fracture of mandibular angle comprises up to one third of mandibular fractures. Many local anatomical factors may increase the risk of such fractures. This study was conducted to investigate the risk of angle fractures with gonial angle measurements.
A retrospective cross-sectional study was conducted on digital panoramic radiographs of 120 patients with isolated mandibular fractures. The patients were categorized into mandibular angle and other nonangle fracture groups. The gonial angle, antegoneal angle, ramus height was measured using Image J software.
Out of 120 isolated mandibular fractures, 40 (33.33%) are angle fractures and 80 (66 .67%) are other nonangle isolated fractures. Seventy- five percent of angle fractures and 85% of non-angle fractures occurred in males. The average age of angle fracture patients was 28.34±5.2 years and 27.37 ±4.9 years for the non-angle fractures with no significant difference (=0.31). The gonial angle of the angle fractures was 127.60 º ±4.93 º which is 6 degrees greater than the non-angle fractures. The antegonial angle of the angle fractures was 160.67±5.38º which is 5.2 º less than the non-angle fractures. The ramus height in the angle fractures was 18.97±3.7 mm which is 2.5 mm shorter than the nonangle fractures. The difference in these three measurements was highly significant (<0.0001). About 45% of angle fractures and 19% of non-angle fractures occurred in the high gonial angle.
The presence of high mandibular angle doubles the risk of mandibular angle fracture. Angle fracture, gonial angle, Image J, mandiblular fractures, orthopantomograph.
下颌角骨折占下颌骨骨折的三分之一。许多局部解剖因素可能增加此类骨折的风险。本研究旨在通过测量下颌角来调查下颌角骨折的风险。
对120例孤立性下颌骨骨折患者的数字化全景X线片进行回顾性横断面研究。患者被分为下颌角骨折组和其他非角部骨折组。使用Image J软件测量下颌角、下颌前角、升支高度。
120例孤立性下颌骨骨折中，40例（33.33%）为角部骨折，80例（66.67%）为其他非角部孤立性骨折。75%的角部骨折和85%的非角部骨折发生在男性。角部骨折患者的平均年龄为28.34±5.2岁，非角部骨折患者为27.37±4.9岁，差异无统计学意义（P=0.31）。角部骨折的下颌角为127.60°±4.93°，比非角部骨折大6度。角部骨折的下颌前角为160.67±5.38°，比非角部骨折小5.2°。角部骨折的升支高度为18.97±3.7mm，比非角部骨折短2.5mm。这三项测量值的差异具有高度统计学意义（P<0.0001）。约45%的角部骨折和19%的非角部骨折发生在下颌角较大的患者中。
下颌角较大使下颌角骨折的风险加倍。角部骨折、下颌角、Image J、下颌骨骨折、全景X线片。
