1977 年 19 巻 4 号 p. 407-412
Five years ago, an impacted third molar was transplanted into a second molar area of a patient aged 37 years old. During subsequent years, clinically the third molar replaced the second molar. Radiographic examination revealed normal bone surrounding the tooth root. Histological study showed thick secondary cement was newly formed and from the cement periodontal fibers were well established to form periodontal membrane space.