THE JOURNAL OF THE TOKYO DENTAL COLLEGE SOCIETY

Vol. 105 No. 6      December 2005

ISSN: 0037-3710      UBIC: 342-J

ABSTRACT

Morphological differences in cancellous bone around fixtures when loaded and unloaded were investigated by observation with micro-CT in canine mandibles. Three months after extraction of premolers. Fixtures edentulous ridge of the canine mandible, and three months later, superstructures were added. At three months after functional loading of the fixture surrounding canceilous bone was observed with micro-CT. Micro-CT showed a clear three-dimensional image of the cancellous bone around the fixture. There was much continuous trabecular bone corresponding to functional loading on the loaded side, with less directional and thinner trabecular boneon the unloaded side. For morphologjcal analysis, bone volume fraction (BV/TV), trabecular thickness (Tb. Th) and trabecular number (Tb. N) were calculated. For cancellous bone, the values on the loaded side were larger than on the unloaded side, and there wasa significant difference in the BV/TV and Tb. N between the loaded and unloaded sides. Moreover, a comparison of the cancellous bone between the near zone and the far zone around the fixture showed that the values at the near zone of the loaded side were the maximum, and the values at the far zone of the loaded side were second. However, ah values at the unloaded side were small, with scarcely any difference between them. There was asignificant difference between the values at the near zone of the loaded side and the far zone of the loaded side and between at the near zone of the loaded side and the far zone of the unloaded sidefor BV/TV, Tb. Th, and Tb. N. This suggests that functional loading of fixtures enlarges the values of the bone parameters around the fixture, and that functional loading changes the from of the bone at the near zone of cancellous bone around fixtures. (The Shikwa Gakuho, 105 577-587, 2005) Key words: Loaded - Cancellous bone - Implants-Microcomputed tomography - Bone morphometry

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