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目的:应用锥形束CT(cone-beam computed tomography,CBCT)对颏孔区解剖结构进行观察、测量和分析,为临床种植手术提供参考。方法:选取100例患者下颌骨CBCT影像资料,对颏孔区解剖结构及可用骨高度和骨宽度进行观察、测量和分析,采用SPSS17.0统计软件包对测量结果进行分析。结果:下颌管前端分颏管和切牙神经管,87.5%颏管向后上外方向开口于颏孔。颏孔上缘至牙槽嵴顶的垂直距离为(12.9±1.28)mm,颏孔前缘至下颌管前端的水平距离为(3.6±1.14)mm,颏孔下缘至下颌管上缘的垂直距离为(3.9±0.97)mm,颏孔上缘内侧1.5 mm至颏管上缘的垂直距离为(1.4±0.42)mm。结论:CBCT能准确反映口腔硬组织解剖结构,颏孔区种植体尖端至颏孔的安全距离应重新评估。
OBJECTIVE: To observe, measure and analyze the anatomical structures of mental foramina by cone-beam computed tomography (CBCT), and provide a reference for clinical implant surgery. Methods: The CBCT images of 100 patients were selected to observe, measure and analyze the anatomical structure of the mental foramen region and the usable bone height and bone width. The measurement results were analyzed by SPSS17.0 statistical software package. Results: The mandibular canal front chin tube and incisor neural tube, 87.5% of the chin tube to the opening up the outside direction of the mental foramen. The vertical distance from the upper edge of mental foramen to the crest of alveolar ridge was (12.9 ± 1.28) mm. The horizontal distance from the front of mental foramen to the front of mandibular canal was (3.6 ± 1.14) mm. The vertical distance from the lower edge of mental foramen to the upper edge of mandibular canal The distance was (3.9 ± 0.97) mm. The vertical distance from the inner edge of the upper edge of the mental foramina to the upper edge of the chin tube was 1.5 mm (1.4 ± 0.42) mm. CONCLUSION: CBCT can accurately reflect the anatomy of oral hard tissue. The safety distance between the tip of the implant and the mental foramen in the mental foramen region should be re-evaluated.