Abstract
Bone anchored device for the wide edentulous area is a treatment method covered by health insurance in Japan for extensive jaw defects, and ten years have passed since it was covered by the insurance. In our hospital, 55 devices have been implanted in 16 patients. The Kaplan-Meier method was used to calculate the cumulative survival rate of the bone anchored device implanted to date, which was 67.3% after 107 months of observation. The cumulative survival rate of jaw reconstruction and a bone anchored device for the wide edentulous area after resection of a malignant tumor was significantly lower than that after benign tumor or trauma. In addition, the survival curves for e bone anchored device for the wide edentulous area with malignancy as the primary disease differed from those of conventional implant treatment, with sporadic dropouts and removals after one year of implantation. These results indicate that long-term maintenance of bone anchored device for the wide edentulous area following reconstruction of the jawbone after resectioning malignant tumors is more challenging than in other primary diseases. In the future, it is necessary to accumulate objective evaluation data of oral function before and after implantation of the bone anchored device for the wide edentulous area to enable risk assessment for each patient and improve patient quality of life through collaboration among specialized departments.
https://ror.org/03bwzch55 
