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치아회분(齒牙灰粉) 및 인공(人工) 수산화(水酸化) 아파타이트 치근(齒根)이 치조제(齒槽堤) 유지(維持)에 미치는 영향(影響

A study on the effect of tooth ash and hydroxylapatite root implantation on preservation of alveolar ridge

Abstract

Biocompatibility of dense synthetic hydroxylapatite is well known and the direct bond with adjacent bone developed. The purpose of this study was to evaluate the potential of clinical application of tooth ash for preservation of alveolar ridge. For this purpose the author performed an experimental implantation of the particulate and root form of both pure dense hydroxylapatite and tooth ash in alveolar sockets immediately after extraction. The pure dense hydroxylapatite was particulate form and root form made by Calciteck Inc. The tooth ash was prepared by incineration at $950^{\circ}C$, and the syrindrical form of the tooth ash was sintered and trimmed to fit the size of the each extraction socket of 10 mongrel dogs. After sugery the clinical, roentgenographical, and histological observation was carried out. The results obtained were as follows; 1. Clinical observation disclosed no dehiscence and exfoliation due to tissue rejection. 2. Vertical resorption of alveolar bone occurred in all experimental sockets as well as the control sites on the roentgenograph. 3. Osteoclastic activity appeared at the inner surfaces of the crestal alveolar bone on the 1st week but disappeared on the 2nd week. 4. There were macrophages in the particulate form on the 1st and 2nd week after surgery but no macrophages appered in the root form. S. New bone formation was developed from the bony wall of experimental sockets and grew to bond with the implant materials. In particulate form the new bone formation did not occur in central zone independently. 6. Tooth ash implant sites were covered with the newly formed bony trabeculation from third week, but Calcitite particles were covered with soft tissue. 7. Generally the healing occurred more rapidly in control sites than in implant sites.

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