摘要
目的:运用锥形束CT(CBCT)分析双下颌管分支情况.方法:用InVivoDental软件对600名(男、女各300名)患者的CBCT影像资料进行观察,分析双下颌管分支的发生类型、概率,测量磨牙后孔中心点距下颌第二磨牙远中釉牙骨质界的水平距离,并对数据进行统计学分析.结果:600名(1 200侧)患者中,有双下颌神经管分支174名,209侧;其中男90名,女84名,男、女比无差异(P＞0.05).双下颌管根据其走向的分类中,前行管的发生率最高(106侧,48.62％).双侧下颌管均有分支35名;仅单侧有分支139名,其中左侧67名,右侧72名,左右侧比较无差异(P＞0.05).不同年龄组中神经管分支的发生率以40 ～ 49岁组较高(40％),各年龄组间两两相比均有统计学差异(P＜0.05).磨牙后孑孔中心点距下颌第二磨牙远中釉牙骨质界的平均水平距离为(14.67±2.67)mm,不同性别和左右侧之间均无统计学差异(P＞0.05).3下颌管分支的有9例,为磨牙后管和其他类型神经管的组合,均位于单侧下颌骨.结论:双下颌管分支的发生率相对较高,前行管的发生率最高.
Abstract
AIM:To observe the bifid mandibular canal (BMC)by cone beam computed tomography (CBCT).MOTHODS:600 CBCT images(300 male and 300 female)were observed by using InVivoDental software.To analyze the type and incidence of BMC and to measure the distance from the midpoint of the retormolar foramen to the distal cement-enamal junction(CEJ)of the second molar by using cone beam computed tomography(CBCT) data were analyzed with chi-squared test and t test.RESULTS:BMC was found in 174 of the 600 mandibles and 209 of the 1 200 sides of which 90 were in males and 84 in females (P ＞ 0.05).According to their course direction thehightest incidence of BMC is forward canal (106 sides,48.62％).Among the 600 patients 35 had bilateral BMC,139 had unilateral BMC,of which 67cases on the left side and 72 cases on the fight side(P ＞0.05).The incidence of BMC in 40 to 49 age group is higher than other groups(P ＜0.05).The distance from the central of the retromolar foramen to the distal CEJ of the second molar was(14.67 ± 2.67) mm and there was no statistical diference between 2 sides and between 2 sexs.Trifid mandibular canal was found on 9 single side,the trifid mandibular canal was compromised by retromolar canal and another type of canal.CONCLUSION:The observation suggest that the BMC is not a rare anatomical structure.The hightest incidence of BMC is forward canal.
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维普
万方数据