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目的:运用MicroCT测量下颌骨牙根尖到颊侧骨板的解剖距离。方法:应用Micro CT(Skyscan1072,Antwerpen,Belgium)及cutome软件分析下颌骨三维骨结构。结果:下颌第二磨牙远中根到颊侧骨板的平均距离为8.51mm,近中根距离7.34mm,融合根7.19mm。下颌第一磨牙近中和远中根到颊侧骨板的距离分别为5.18mm和4.09mm。当出现有2个远中根时,远中舌侧根到颊侧骨板的厚度约9.52mm。第一前磨牙和第二前磨牙到颊侧骨板的平均距离分别为3.68mm和3.02mm。前牙牙根到颊侧骨板的距离2.07mm～2.48mm。男性下颌骨颊侧骨板厚度大于女性,差异没有统计学意义(P>0.05)。结论:Micro CT是一种快速、准确、不损伤样本内部结构的有效的评价方法。牙根尖到下颌颊侧骨板厚度的测量结果可为牙根尖手术和牙种植术提供理论依据。
Objective: To use MicroCT to measure the anatomical distance from the apical to the buccal plate of the mandible. Methods: Three-dimensional (3D) bone structures of the mandible were analyzed with Micro CT (Skyscan1072, Antwerpen, Belgium) and cutome software. Results: The mean distance between distal root and buccal plate in mandibular second molar was 8.51 mm, the distance between proximal and middle root was 7.34 mm, and the fusion root was 7.19 mm. The distance between the mesial and distal roots of mandibular first molars to the buccal plate was 5.18 mm and 4.09 mm, respectively. When there are 2 distal roots, the thickness of the distal mid-lingual root to the buccal plate is about 9.52 mm. The average distance between the first premolar and the second premolar to the buccal plate was 3.68 mm and 3.02 mm, respectively. Anterior tooth root to the buccal plate distance 2.07mm ~ 2.48mm. The thickness of the mandibular buccal plate in males was larger than that in females, with no significant difference (P> 0.05). Conclusion: Micro CT is a fast, accurate and effective method of evaluation without damaging the internal structure of samples. The measurement results from apical to maxillary buccal plate thickness can provide a theoretical basis for apical and dental implantation.