Evaluation of permanent and primary enamel and dentin mineral density using micro-computed tomography
Evaluation of permanent and primary enamel and dentin mineral density using micro-computed tomography
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DOI：
10.1007/s11282-018-0315-2
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发表时间：
2019-01-01
期刊：
影响因子：
2.2
通讯作者：
Nishiyama, Hideyoshi
中科院分区：
文献类型：
--
作者：
Hayashi-Sakai, Sachiko;Sakamoto, Makoto;Nishiyama, Hideyoshi
ObjectivesThe目前的研究进行调查的牙釉质和牙本质的矿物密度分布的恒牙和乳牙，并建立标准的密度每牙齿类型使用micro-computed tomography（CT）。用micro-CT测量离体牙的牙釉质和牙本质密度。三次回归曲线被用来确定在牙釉质和牙本质的矿物密度分布为每个牙齿type.ResultsThe平均值，分布和回归方程的矿物密度。永久性牙釉质和牙本质的平均矿物密度值显着高于他们的主要同行为每个牙齿type.ConclusionsIn本研究中，我们证明了在健全的牙釉质和牙本质的矿物密度的分布，并试图确定使用micro-CT的每种牙齿类型的标准矿物密度。在这项研究中发现的矿物密度分布有助于我们理解的釉质和牙本质的机械性能。正相关性表明，全身骨密度可以预测的基础上脱落的牙齿，如低磷酸盐血症患者的分析。本研究结果可能有助于建立一个数值标准的机制，在牙根断裂和早期发现牙根断裂的风险。
ObjectivesThe present study was performed to investigate the mineral density distribution in enamel and dentin for both permanent and primary teeth and to establish the standard density per tooth type using micro-computed tomography (CT).MethodsFifty-seven extracted human teeth (37 permanent, 20 primary) were evaluated in the present study. The enamel and dentin mineral densities in the extracted teeth were measured using micro-CT. Cubic regression curves were used to determine the mineral density distribution in the enamel and dentin for each tooth type.ResultsThe mean values, distributions, and regression equations of the mineral densities were obtained. The mean mineral density values for permanent enamel and dentin were significantly higher than those for their primary counterparts for each tooth type.ConclusionsIn the present study, we demonstrated the distribution of mineral density in sound enamel and dentin and attempted to determine the standard mineral density for each tooth type using micro-CT. The mineral density distributions found in this study contribute to our understanding of the mechanical properties of enamel and dentin. A positive correlation suggests that the systemic bone mineral density could be predicted based on the analysis of exfoliated teeth, such as in patients with hypophosphatasia. The present results may be useful in establishing a numerical standard for the mechanism involved in root fracture and for early detection of root fracture risk.