摘要
目的使用锥形束CT (CBCT)探究成人下颌管分支发生率,总结磨牙后管存在分型及形态特征并测量各位点间线性距离。方法系统随机抽取2017-2019年于贵阳市口腔医院放射科行CBCT拍摄的500例患者数据,所取样本经严格纳入排除标准后纳入分析,观测并统计下颌管分支数量、类型、比率等及磨牙后管的存在分型和形态学特点,并做相关测量。结果 (1)研究最终纳入样本445例(890侧),发现分支神经管364侧(40.90%),其中最常见为牙管147侧(16.52%),其次为前行管118侧(13.26%)和磨牙后管99侧(11.12%),未见颊舌向管。(2)共计发现90例磨牙后管,其中男性44例,女性46例;左侧36侧,右侧63侧,性别间差异无统计学意义,右侧磨牙后管多于左侧,差异有统计学意义(P<0.05);磨牙后管按形态与走向轨迹分Ⅰ~Ⅷ型,其中Ⅱ型管最多见,达50侧(50.51%),其次Ⅰ型管23侧(23.23%),Ⅵ型管最少见,仅1侧(1.01%)。(3)磨牙后管垂直高度平均(10.39±2.47) mm,水平长度平均(11.93±3.03) mm,磨牙后孔距第二或第三磨牙远中釉牙骨质界(CEJ)平均(11.55±5.37) mm,磨牙后管的平均起点管径和出口管径分别为(1.75±0.77) mm和(1.26±0.51) mm,起点管径宽于出口管径,差异有统计学意义(P<0.05)。结论磨牙后管并非罕见的解剖结构,术前CBCT评估下颌管分支、磨牙后管形态有助于规避手术风险,制定更安全的手术计划。
Objective To investigate the incidence of bifid mandibular canal of adult by cone beam computed tomography(CBCT), summarize the types of retromolar canals with their morphological characteristics and measure the linear distance of each point. Methods The clinical data of 500 patients undergoing CBCT were collected from the Department of Radiology, Guiyang Stomatological Hospital from 2017 to 2019, which were screened strictly according to the inclusion criteria to observe the number, types, proportion of bifid mandibular canals, as well as the morphological features and types of retromolar canals. Results(1) A total of 445 cases(890 sides) were included into this study, of which 364 sides(40.90%) of branches were found, including 147 sides of dental canal(16.52%), 118 sides of forward canal(13.26%), and 99 sides of retromolar canal(11.12%), with no buccolingual canal.(2) 90 cases of retromolar canal were founded in all, including 44 males and 46 females, with 36 in left sides and 63 in right sides;there was no significant difference between genders;but right canal was significantly more than left canal(P<0.05). Retromolar canal was divided into typeⅠ to Ⅷ according to its shape and trend, mostly typeⅡ(reaching 50 sides, occupying 50.51%), followed by type Ⅰ( 23 sides, 23.23%), and then type Ⅵ(1 side, 1.01%).(3) The average vertical height and horizontal length of the retromolar canal were(10.39±2.47) mm and(11.93±3.03) mm, respectively. The average distance from retromolar canal to distant cemento-enamel junction of second or third molar was(11.55±5.37) mm. The average starting diameter of retromolar canal was(1.75±0.77) mm, significantly wider than(1.26±0.51) mm of outlet diameter(P<0.05). Conclusion Retromolar canal real is not a rare anatomical structure. CBCT plays an important role in the preoperative evaluation of mandibular canal branches and retromolar canal morphology, which can help to avoid the surgical risks and make a safer plan.
作者
胡腾
冯红超
王朝辉
邵敏
余鑫
HU Teng;FENG Hong-chao;WANG Zhao-hui;SHAO Min;YU Xin(Guizhou Medical University,Guiyang 550002,Guizhou,CHINA;Guiyang Stomatological Hospital,Guiyang 550002,Guizhou,CHINA)
出处
《海南医学》
CAS
2020年第7期893-896,共4页
Hainan Medical Journal
基金
贵州省卫生计生委科学技术基金(编号:gzwjkj2018-1-078)。
