上顎切齒部 齒槽骨分析切斷 및 再植術이 齒髓組織에 미치는 影響에 關한 實驗的 硏究

Histologic Study of Pulpal Response Following Maxillary Osteotomy Containing Single Tooth in the Dog

Several investigators have conducted animal experiments to detect postoperative micromorphologic state of the pulps after dentoalveolar surgery including one or several teeth. And their previous studies have shown that segmental osteotomy is effective in orthognathic surgery. The purpose of this study was to evaluate histologically the pulps of teeth involved in maxillary unitooth osteotomy. Segmental and single tooth osteotomy via buccal flap involving the maxillary third insisor was performed in 6 adult dogs, weighed about 9 Kg. Five dogs were sacrificed in the first, third, seventh, fourteenth, and forty-second day after surgery and one dog was randomly designated as control. Micropaque (Barium Sulfate) was infused into each animal to evaluate blood supply in pulp tissue. After routine embedding & H-E stain, the pulps were examined histologically. The results were as follows; 1. Congestion and extravasation of erythrocytes were observed severely in postoperative first day specimen and slightly in third day specimen. 2. Odontoblastic layer was severely disrupted in fist day and third day specimen, and it was mild and well-arranged in seventh day specimen, and it was normal in fourteenth and forty-second day specimen. In that, normal healing process was found. 3. Micropaque has already been found in postoperative first day specimen. It was thought that collateral circulation from the unreflected palatal soft tissue seemed to be adequate. 4. Apical resorption was found in postoperative forty-second day specimen. But, it only showed micromorphologic change. Because apical resorption was so little, it seemed that tooth devitalization has not occurred.