長期経過観察を行った再建下顎骨に植立したオッセオインテグレーテッドインプラントの1症例

抄録

A case of 10-year follow-up after treatment with osseointegrated implants following reconstructive surgery with iliac bone graft was reported.
The patient was 23-year-old male who was referred to our clinic due to swelling in the left lower molar region. Extraoral findings showed painless and diffuse hard swelling from the left chin to the mandibular ramus angle.Intraoral findings showed the swelling at the mucogingival junction from 4 to 8.
Radiographic findings showed multilocular radioluent area from 4 to the mandibular ramus.
A biopsy was performed,and examination of the biopsy specimen indicated ameloblastoma.
The patient underwent left hemimandiblectomy and mandibular reconstruction using iliac bone graft simultaneously on Oct. 27, 1988. The plates and screws were removed,and free gingival graft was performed in 3-6 region on Nov. 7, 1988. Implantation using ITI Bonefit^® was performed in 3-6 region on Dec. 16, 1989. Superstructures were fixed removably (screw retaining type) to the implants in Mar.,1990. The patient has been observed for 10 years after implantation. There are no problems at present.
Absorption of the grafted iliac bone was 24.8% for 9 years after the reconstructive surgery by radiograph. Especially, it was 4.9% for 8 years after the implantation.
PAL (Probing Attachment Level) showed slight attachment loss,and PERIOTEST^® (SIEMENS Product) showed a decrease of the score. PPD (Probing Pocket Depth) did not show appressed change. DENTAL PRESCALE^® (FUJIFILM Product) score showed 888.7 N. The result was a high score, and so it was suggested that the implants resisted the occlusal force.