Department of Endodontics and Periodontics, University of Southern California, Los Angeles, CA, USA.
Herman Ostrow School of Dentistry of USC, University of Southern California, 925 W. 34Th Street, DEN 310, Los Angeles, CA, 90089-0641, USA.
Odontology. 2023 Oct;111(4):904-909. doi: 10.1007/s10266-023-00801-4. Epub 2023 Mar 30.
A significant advancement in micro-computed tomography (μCT) translational application in endodontics has occurred. The purpose of the study was to assess the applications of a new method to measure dentin mineral density (DMD) and to compare between 2 levels of energy sources. Two sets of standardized porous solid hydroxyapatite (HA) phantoms, with mineral densities of 0.25 g/cm and 0.75 g/cm3, respectively were embedded in aluminum foil. The μCT homogeneity and noise in the HA phantoms were analyzed using 50 kV and 100 kV energy sources. DMD of 66 extracted human teeth was measured at the cemento-enamel junction (CEJ), mid-root, and apical levels. Assessment included linearity between the energy source and the DMD measurement. The quality of the images obtained from the 2 energy sources was compared and analyzed statistically. HA phantom rods and validation methods showed that 100 kV provided a more accurate measurement of the DMD in all groups tested. The 100 kV 3D reconstructed µCT images displayed a more defined details of the dentin structure. A statistically significant difference was found between 100 and 50 kV (p < 0.05) in all measured areas except for the mid-root. Using micro-computed tomography is a practical and non-destructive method to measure dentin density. 100 kV energy source provides clearer and more consistent images.
在牙髓学中，微计算机断层扫描（μCT）的转化应用取得了重大进展。本研究的目的是评估一种新方法测量牙本质矿物质密度（DMD）的应用，并比较两种能量源之间的差异。两组标准化多孔固体羟基磷灰石（HA）模型分别嵌入铝箔中，矿物质密度分别为 0.25 g/cm 和 0.75 g/cm³。使用 50 kV 和 100 kV 两种能量源分析了 HA 模型的μCT 均匀性和噪声。在牙釉质-牙骨质交界处（CEJ）、根中部和根尖部测量了 66 颗人离体牙的 DMD。评估包括能量源与 DMD 测量之间的线性关系。比较了两种能量源获得的图像质量，并进行了统计学分析。HA 模型棒和验证方法表明，在所有测试组中，100 kV 能更准确地测量 DMD。100 kV 的 3D 重建μCT 图像显示了更清晰的牙本质结构细节。在所有测量区域，除了根中部，100 kV 和 50 kV 之间都存在统计学差异（p < 0.05）。使用微计算机断层扫描是一种实用且非破坏性的方法来测量牙本质密度。100 kV 能量源提供更清晰和更一致的图像。
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