MSCT对成年人下颌神经管的测量分析

The Measurement of Adult Mandibular Neural Tube by MSCT

目的:通过MSCT研究下颌神经管的走行,为下颌骨种植术前评估提供数据支持。方法:收集60例成人的下颌骨MSCT数据,测量不同观察截面下颌神经管至四周骨壁的垂直及水平距离,并对比分析男女之间、左右侧之间的差异。结果:下颌神经管的上缘至下颌骨牙槽嵴顶的垂直距离范围为(13.21±1.73)mm至(18.03±1.73)mm;除颏孔区外,男女间差异有统计学意义,而左右组间差异无统计学意义。下颌神经管的下缘至下颌骨下缘的垂直距离范围为(15.57±1.51)mm至(8.41±1.35)mm;男女间差异有统计学意义,左右组间差异无明显统计学意义。下颌神经管的外侧缘至下颌骨颊侧骨板的水平距离范围为0 mm至(8.01±1.33)mm;下颌神经管的内侧缘至舌侧骨板的平均距离范围为(7.91±1.03)mm至(2.52±0.49)mm;在男女组间、左右两侧组间差异均无统计学意义。结论:MSCT可以准确地反映下颌神经管在下颌骨内的走行;在下颌骨后牙区种植时,植入体长度在10～15 mm间较为安全。

Objective:The course of mandibular nerve canal in mandibular posterior region was judged by MSCT,which provided theoretical support for preoperative evaluation of mandibular posterior region implantation.Methods:MSCT data of 60 adult mandibles were collected to measure the distance of mandibular neural tube from the surrounding bone wall in the posterior tooth area and to compare and analyze the difference between male and female and between left and right sides.Results:The vertical distance from the upper margin of mandibular neural tube to the alveolar crest of mandible ranged from(13.21 ± 1.73) mm to(18.03 ± 1.73) mm,Except for the mental foramen area,there was statistical difference in gender,and no statistical difference between the left and right side.The vertical distance from the inferior margin of the mandibular canal to the inferior margin of the mandible ranged from(15.57 ± 1.51) mm to(8.41 ± 1.35) mm.There was statistical difference in genderand no statistical difference between the left and right side.The horizontal distance from the lateral margin of the mandibular canal to the buccal bone plate of the mandible ranged from 0 mm to(8.01 ± 1.33) mm.The mean distance from the medial margin of the mandibular canal to the lingual bone plate ranged from(7.91 ± 1.03) mm to(2.52 ± 0.49) mm.There was no statistical difference in gender or left and right.Conclusion:MSCT can accurately reflect the course of mandibular canal;When implanting in the posterior mandibular region,the length of the implant is between 10 and 15 mm,which is relatively safe.