未完成移植の臨床的並びに実験的研究

Abstract

Part. 1 Clinical StudyTransplantation of developing teeth were performed in eighty-five cases of the young adults. Fifty-five of them were transplanted autogenously, twehty-f our were transplanted homogenously, and six displaced teeth were surgically corrected their position. Results are as following:1) Transplantation was succeeeded in seventy-five cases: Fifty-two autogenous (94.5%), seventeen homogenous (70.8%) and six surgical-orthodontical (100%) . Two months after operation, they were tightly held in alveolar bones, and they became to be able to stand the masticatory function.2) Seventy-two per cent of transplanted teeth indicated vital reaction to the electric pulp tester eight months after the operation, and the teeth which had halfly developed roots on transplantation showed the highest per centage of vital pulps in this test The teeth homogenously transplanted did'nt show vital reaction.3) In the cases of autogenous and surgical orthodontical transplantations, the formations of periodontal membrane and root apex was observed roentgenographically. In homogenous transplantation, however, no development of periodontal membrane and teeth were found although the reestablishment of alveolar bones.4) The elongation of the root were not markedly.Part 2. Experimental Study1) The wounds of the homogenous and autogenous transplantation healed well on the histological observation, the epithelial attachments were located at cement-enamel junction, and no down growth of the epithelium to the apical were observed.2) In the cases of autogenous transplantation; the osteoid and secondary dentin (in only apical portion) were added to the dentin surfaces of transplanted teeth narrowing the pulp chamber and the apical foraminae were formed by the addition of new cementum. Their alveolar socket walls and periodontium were also rebuild getting normal condition.3) In the case of homogenous transplantation; the alveolar bone were build excessively resulting bony union with transplanted teeth and the periodontal membrane were not regenerated. Some resorption of the apical root surfaces of the transplanted teeth were observed after two months.From these observations, it is considered that the autogenous and surgical-orthodontical transplantations should be performed more in clinic and that those teeth are expected to serve with a fairly good eternity.The teeth with halfly developed roots are considered to be in the best conditions for transplantation.The permanency of the homogenously transplanted teeth is considered less than expect of the autogenously transplanted teeth.