神経支配除去のもとにおける窩洞形成充填後の歯髄の変化に関する神経組織学的研究
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概要
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Cavity preparations and fillings were undertaken after denervation in the dental pulp of the mandibular teeth by inferior alveolar nerve resection in monkeys. Histopathological and neurohistological studies of pulpal changes beneath the cavity prepatation in the resected teeth were made in comparison with those in the non-resected teeth. The following results were obtained. 1. At 1 week after the operation, the irregularity of cellular arrangement, atrophy and disappearance of odontoblasts, and dilatation and congestion of blood vessels and hemorrhage in the pulp beneath the cavity preparation were seen in the non-resected teeth. The Raschkow nerve plexus inside the odontoblasts and nerve fibers which branched from this nerve plexus and penetrated into the odontoblasts were seen. There were many nerve fibers missing in the bleeding portion and the nerve fibers with large diameter persisted. In the recected teeth, the findings of pulpal changes were similar to those in the non-resected teeth, but nerve fibers were not observed. 2. At 2 weeks after the operation, the changes of odontoblasts were not much different from those at 1 week after the operation, but the dilatation and congestion of blood vessels, and hemorrhage were somewhat severer. The distribution of the nerve fibers was similar to that at 1 week after the operation, but the most of nerve fibers in the bleeding portion disappeared. In the resected teeth, the findings of the pulpal changes were similar to those in the non-resected teeth, but dilatation and congestion of blood vessels, and hemorrhage were slightly severer. Additionally nerve fivers were not seen. 3. At 3 weeks after the operation, the pulpal changes were mild as compared with those in 2-week postoperative specimens both in the non-recected and resected teeth. Similar findings were observed except severe dilatation and congestion of blood vessels in the resected teeth. Thickening of predentin and initiation of reparative dentin formation were seen beneath the cavity preparation. In the nerve fibers of the non-resected teeth, the Raschkow nerve plexus was sparse in the portion with the thickening of predentin. No nerve fivers were seen in the resected teeth. 4. At 5 weeks after the operation, the reparative dentin formation was observed in both the non-resected and resected teeth, which showed similar histologic structures. The odontoblasts in this portion showed more intense regressive degeneration than in the 5-week-postoperative specimens, and in the pulp the circulatory disturbance such as dilatation and congestion of blood vessels and hemorrhage was intensified, which was severer in the resected teeth as compared with that in the non-resected teeth. In the nerve fibers of the non-resected teeth, the Raschkow nerve plexus was indistinct where the pulpal changes were striking. No nerve fibers were observed in the resected teeth. 5. According to the above results, in the cavity preparation and filling after denervation by resecting of the nerve fibers, the circulatory disturbance occurred somewhat more intensely as compared with that in the teeth with innervation ; however, with regard to the pulpal repair, particularly the reparative dentin formation, the findings were similar in both the resected and non-resected teeth. Consequently it was considered that the reparative dentin formation was not related with the presence or absence of innervation.
- 九州歯科学会の論文
- 1987-02-25