| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
The purpose was to determine whether the bone remodeling in human tooth extraction sockets attained points of relative stability, and if so, at which post-extraction times such points would be reached. Subjects were 5 males and 31 females receiving implant operations or dental transplantation surgery. Post-extraction times ranged from 1.6 to 360 months. The alveolar bone biopsy samples were analyzed using micro-computed tomography and three-dimensional bone morphometry. Various alveolar bone parameters were plotted against post-extraction times, and a stepwise piecewise linear regression analysis was performed. The period between 7 and 12 months post-extraction was found to contain the greatest number of inflection points. Once these changes reached their respective inflection points, the time-related changes stopped. In the human alveolar bone, dynamic remodeling of the trabecular structure was found to continue to occur until the 7th - 12th month post-extraction.
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