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目的:应用CBCT对正常人群下颌管在第二前磨牙及第一、二磨牙根尖处位置的测量,来确定其正常位置关系。方法:测量120例18岁以上正常人群第二前磨牙及第一、二磨牙根尖处位置的3个距离:①下颌管中心(A)到下颌骨下缘最下点(B)的距离;②下颌管中心(A)到与A点在同一水平线的颊侧点(C)的距离;③下颌管中心(A)到与A点在同一水平线的舌侧点(D)的距离。每个距离测量3组,取其平均值。结果:男性第二前磨牙根尖处的下颌骨下缘骨壁最厚,其舌侧骨壁厚于颊侧骨壁。在第一磨牙及第二磨牙处,下颌骨下缘骨壁、舌侧骨壁、颊侧骨壁均增厚,且颊侧骨壁厚于舌侧骨壁;女性测量结果及规律与男性相同,其骨壁厚度略较男性骨壁为薄。结论:利用这3个空间距离来确定正常人下颌管在第二前磨牙及第一、二磨牙根尖处的位置,对正颌手术中下颌骨矢状劈开术,囊肿刮治术,种植术等提供理论依据。
OBJECTIVE: To determine the normal position of the mandibular canal in the second premolar and the first and second molars by CBCT. Methods: The distance between the center of mandibular canal (A) and the lowermost point (B) of the lower edge of the mandible was measured in 120 cases of the second premolar and the first and second molars. ② the distance from the center of the mandibular canal (A) to the buccal point (C) on the same horizontal line as point A; ③ the distance from the center of the mandibular canal (A) to the lingual point (D) on the same horizontal line as point A. Each distance measurement 3 groups, whichever is the average. Results: The maxillary mandibular margin of male second premolar root was the thickest, and the lingual bone was thicker than the buccal wall. In the first molars and the second molars, the mandibular lower edge of the bone wall, the lingual bone wall, buccal bone wall thickening, and the buccal bone wall thicker than the lingual bone wall; women with the same measurement and the same rules as men , The thickness of the bone wall is slightly thinner than the male bone wall. Conclusion: The three spatial distances were used to determine the position of the mandibular canal in the second premolar and the first and second molars, and to evaluate the effects of orthodontic mandibular sagittal dissection, cyst cure, implantation Provide theoretical basis for surgery.