下顎無歯顎患者に対するインプラントオーバーデンチャーによる治療

―九州地区での2002年のアンケート調査の結果―

抄録

The atrophied edentulous mandible had been the first indication for implant-supported prostheses early in the development of the Brånemark Implant System. Today, there are a large number of cases treated with dental implant restorations worldwide. We believe that a relatively small number of cases with edentulous mandibles are treated with implant-supported overdentures in Japan. Recently, Prof. G.E. Carlsson of Göteborg University, Sweden, proposed that 10 countries including Japan investigate, using international surveys, the use of mandibular implant-supported overdentures in 2001. Therefore, we sent questionnaires to 17 dental hospitals or private dental clinics in the Kyushu area to survey the use in 2001 and 2002.
The aim of this study was to estimate the use of mandibular implant-supported overdentures in the Kyushu area in 2001 and 2002.
In 2002, 1,123 cases were treated with dental implant restorations in 16 clinics and dental hospitals in the Kyushu area, and 102 cases of totally edentulous mandible (9.0%) were included in this series. Overdentures were indicated in 39 of these cases, and the other 63 cases were restored by means of implant bridges. By comparison, in 2001, 1,269 cases were treated with dental implant restorations in 17 clinics and dental hospitals, and 68 cases of totally edentulous mandible (5.4%) were included in this series. Overdentures were indicated to 26 of these cases, and the other 42 cases were restored by an implant bridge. This result suggests that demand for implant prostheses from patients with a totally edentulous mandible has been recently increasing in the Kyushu area.