人下颌第一磨牙釉质帽与牙本质核三维形态的初步研究

发布时间：2018-08-07 16:14

【摘要】：目的:通过人下颌第一磨牙釉质帽和牙本质核的三维重建模型,探讨其内在三维形态规律。方法:选取人下颌第一磨牙20个,采用显微CT对其进行三维扫描及重建后,在逆向工程软件中精确测量髓室各髓角至其各自相应牙本质尖、牙尖表面的距离,并同时测量其牙釉质帽、牙本质核、牙髓的体积和面积。结果:成功获得人下颌第一磨牙釉质帽与牙本质核的三维模型,测量和统计结果显示:牙本质核、牙髓组织体积和面积之间存在统计学相关(P㩳0.05),各髓角至各自相应牙本质尖的距离以远舌牙本质尖最大,依次为:远舌牙本质尖远颊牙本质尖远中牙本质尖近舌牙本质尖近颊牙本质尖,其中远舌尖、远颊尖、远中尖分别与近舌尖、近颊尖相比,差异均有统计学意义(P㩳0.05);各髓角至各自相应牙尖的距离以远舌尖最大,依次为远舌尖近舌尖远中尖远颊尖近颊尖,各组间两两相比差异均有统计学意义(P㩳0.05)。结论:成功获得了精确的下颌第一磨牙三维模型,并初步归纳出其牙釉质帽和牙本质核的内在三维形态规律。
[Abstract]:Objective: to study the internal three-dimensional morphological pattern of enamel cap and dentin nucleus in mandibular first grinding. Methods: twenty mandibular first molars were scanned and reconstructed by microCT. The distance between the pulp angles of pulp chamber and their respective cusps and cusps were measured in reverse engineering software. At the same time, the volume and area of enamel cap, dentin nucleus and pulp were measured. Results: the 3D model of enamel cap and dentin nucleus of human mandibular first grinding tooth was successfully obtained. There was a statistical correlation between the volume and area of dental pulp tissue (P0. 05). The distance between each pulp angle and its corresponding dentin tip was the largest in the distal lingual dentin tip. In turn, the distal and distal cusps of dentine and the distal cusp of dentin and the tip of distal tongue, distal buccal and distal cusp were compared with the proximal tip of tongue and proximal tip of buccal, respectively, and the distal tip of tongue, distal point of cheek and distal tip of distal cheek were compared with those of proximal tip of tongue and proximal point of buccal dentin. The distance from each pulp angle to the corresponding cusp was the largest, followed by the distal tip of the tongue near the distal tip of the tongue and the proximal point of the distal tip of the cheek (P0. 05), and the difference between the two groups was statistically significant (P0. 05). Conclusion: the accurate 3D model of mandibular first molar was successfully obtained and the internal 3D morphology of enamel cap and dentin nucleus was preliminarily concluded.
【作者单位】：第四军医大学口腔医院修复科军事口腔医学国家重点实验室;
【基金】：国家自然科学基金资助项目(31370950)
【分类号】：R781.2

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