| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
There is complexity associated with the mechanical or chemical processes in the creation of abfraction lesions. This study aimed to analyze mineral density and micro-cracks in extracted teeth with NCCL after demineralization, using micro-CT. Premolars with NCCL were immersed in a demineralization solution. After demineralization, the specimens were scanned by micro-CT. Thin sections were then prepared for SEM examination. The changes in width of cracks in the enamel surface were measured at each time point. Micro-CT images around the CEJ showed destruction of the enamel layer after demineralization. The length and width of cracks were increased significantly after demineralization. Comparisons of the micro-CT and SEM images revealed that the lines of the cracks were at the same positions. Micro-cracks on the cervical surface of human premolars with NCCL were detected by micro-CT. Demineralization of the cervical region progressed along the micro-cracks.
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