完成歯再植後の治癒過程に関する実験的研究
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概要
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A replantation experiment was conducted with use of 52 teeth with the completed root formation (upper and lower central and lateral incisors : [numerical formula]) of 14 matured Japanese monkeys, Macaca fuscata (1 in control group and 13 in experimental group) and pathohistologic investigation were made. The results were as follows : 1. At the tears observed in the periodontal fibers and around the tears, fibroblasts actively proliferated from 3rd to 5th days after replantation. On 10th day, new minute collagen fibers were observed. From 15th to 20th days, tears became unclear and presented conditions like those of normal periodontal tissue, from 30th to 45th days. 2. From 3rd to 10th days after replantation, a decreasing tendency of fibroblasts and degenerative changes such as hyaline degeneration were seen in part of the periodontal fibers. However, hyalinization of the fibers gradually decreased thereafter. 3. Partial resorption of the root surface was seen in all the speciment on and after 5th days after replantation. The extent of resorption varied from as shallow as to cementum to as deep as to dentin. 4. Resorption cavities on the root surface were repaired by deposition of secondary cementum in all cases beginning on 15th day after replantation. 5. Resorption of the alveolar bone began on 3rd day after replantation and was marked from 5th to 10th days. From 15th to 20th days, osteoblasts appeared in the resorpted region and formation for restoration was seen. 6. Ankylosis between tooth and alveolar bone was observed in only one each on 15th, 45th, and 75th days after replantation. 7. Healing on the basis of restoration to normalcy of the periodontal membrane was seen in 49 of the 52 cases. Based on the foregoing, replantation appears to be an effective method and healing by normal periodontal membrane can be expected provided the following conditions are met : preservation of the periodontal membrane, freshness, replantation of the tooth within 15 minutes after extraction and proper treatment of the pulp.
- 九州歯科学会の論文
- 1985-04-25