Hydroxyapatite/collagenコンポジットマテリアルによる歯槽堤保存術の１症例

歯槽堤保存術

北海道歯学会

北海道歯学雑誌

Resorption of the alveolar process following tooth extraction leads to thinning of the alveolar ridge, making it difficult to place implants. In recent years, bone grafting materials have been used to preserve the alveolar ridge and prevent bone resorption after tooth extraction. However, eviden ce regarding the efficacy of bone grafting materials remains unclear. We report a case in which a good clinical outc ome was achieved by using hydroxyapatite/collagen (HA/Col) to preserve the alveolar ridge for implant placement following tooth extraction. The patient was a 32-year-old woman who visited the clinic in June 2014 with a chief complain t of occlusal discomfort in the right mandibular molar region. A probing depth of 12 mm was observed on the right side of the first molar, with pus discharge from the mesial root. Radiographic examination showed bone resorption surroundi ng the first molar, indicating that the tooth was unsalvageable. To prevent alveolar ridge resorption following extraction, HA/Col (Refit, HOYA, Japan) was placed in the socket immediately after tooth extraction. The implant was placed 12 weeks following tooth extraction after uneventful healing was confirmed with cone-beam computed tomography. A bone biopsy of the grafted site was taken during implant placement and stained with hematoxylin and eosin. Three months after implant placement, second-stage surgery was carried out, followed by conventional loading using a provi sional restoration. A permanent platinum-gold alloy restoration was subsequently placed. No abnormal oral clinical findings were observed up to October 2024, and the tooth seems to have a good prognosis, with no bone resorption or peri-implantitis.　In conclusion, HA/Col appears to be an effective bone grafting material for alveolar ridge preservation after tooth extraction. In addition, the newly formed bone tissue following graft resorption was maintained over the long term.