抜歯窩における骨代用材補填に関する実験的研究 : 特に血管と神経の形成過程について
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The daily changes in the blood capillary, nerve and the other tissues in the remodeled extraction sockets of Macaca fuscata fuscata were examined. Commercial hydroxyapatite (HAP) granules into the new extraction sockets, and uncompacted sockets were used as the control. The experimental schedule was carried out from 1 day to 24 weeks. A difference was found on the granulation tissues of the control and the implant group in the both remodeled extraction sockets. In the control, the postoperative granulation tissue from the lst week to the 4th week was rich of blood capillaries and fibroblasts. On the other hand, in the implant group newly formed granulation tissue was small in quantity because of the presence of HAP granules. In addition, the tissue was poor in blood capillary and fibroblast, and rich in fibers. In the 8th week, the granulation tissue in the control was changed to connective tissue which was rich in blood capillaries. On the contrary, the tissue in the implant group was poor in blood capillary and rich in fibers. The new bone trabeculae was seen in both groups within a week. It was formed at about 1/2 region from the bottom of the extraction socket in the control, and from about 1/4 to 1/3 region in the implant group 2 weeks after the preparation of the extraction cavity. The formation of bone trabeculae of the implant group was slower than that of the control even after 24 weeks. However, the trabeculae were dense in the former and the calcification rate was faster than the control. The nerve fiber entered as a fiber bundle into the remodeled extraction sockets with the blood capillary from Vasa vasoneural that opened at the bottom of the cavity and its wall. The fiber bundle was branched off in a small nerve bundle and single fiber which ran along with the blood capillary, and along the cavity wall or directed against the center region of the cavity. They were distributed over the socket. In the control the nerve fiber run upward or to the central part within the granulation tissue between the bone trabeculaes. On the other hand, in the implant group they showed the same pattern as the control, but there were some nerve fibers attached to the HAP granules. When the nerve bundles of the implant and the control groups were compacted, the former were tiny and distribution small. Also, the growth of the former was slower than that of the latter. These changes may have been induced by the presence of HAP granules within the socket in which the formed amount of granulation tissue was restricted, there were few blood capillary, and the fiber ingredient was compacted. The preservation of the alveolar ridge of the implant groups was better than the control in height and width. These findings suggest that the application of HAP granules into the extraction socket as the medical biomaterial maybe clinically a useful method.
- 1991-06-30
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