1997 年 43 巻 10 号 p. 754-756
We describe a patient who underwent autotransplantation of a tooth to the maxillary molar region, which lacked adequate bone thickness from the alveolar crest to antral floor. The patient was 34-year-old man with a missing left maxillary second molar. The right mandibular premolar, which had to be extracted because of orthodontic reasons, was transplanted to the region. The apical half of the root of the transplanted tooth projecting into the maxillary sinus was covered with the sinusmucoperiostium, which was carefully detached from the floor, to preserve blood-circulation to periodontal cells. The pocket-depth, mobility, and percussion-sound of the transplanted tooth were normal, and the periodontal space and newly formed bone were observed radiographically around the root 6 months after transplantation. The findings indicated that a tooth can be successfully autotransplanted to a maxillary-molar region that lacks adequate alveolarbony thickness withont the use of a bone graft.