5,092本のインプラント臨床成績

抄録

The purpose of this retrospective study was to designate an outline of criteria for the clinical evaluation of patients treated with dental implants. In this paper, the contents of our survey are also reported briefly. A total of 2,261 patients (957 males and 1,304 females), ranging in age from 10 to 88, participated in this study. The patients in their 40s and 50s represented 62.1% of the total number of subjects. The number of implants examined was 5,092, which had been placed in 2,969 cases. The numbers of cases and implants placed during the 1990s were higher by 2.7 times and 3.6 times compared with the 1980s, respectively. The mean number of implants was 2.3 for males and 2.2 for females. Those who had systemic health problems accounted for 11.7% of the total number of patients, of which 49.5 percent were suffering from some form of circulatory disease, out of the total number of systemic diseases. Cigarette smokers, habitual drinkers, and in particular drug users, were very few, but there was a gender difference in these habits. Many implants were planted in the mandible, free end missing parts, partially endentulous dental arches and the molar region. The prostheses supported by implants were mostly cement-retained bridges for retention and implant/implant bridges for connection. Regarding the implant design, screw-type implants were frequently used. The surface of most implants was coated with hydroxyapatite. Many implants were 10-15 mm long and 3 mm in diameter. Bone quality and bone quantity in both the maxilla and the mandible were medium. The mean number of years after implant placement was 5.5 years. As for the present condition, 85.4% of the cases and 87.8% of placed implants were favorable. The above-mentioned findings suggested that further studies would be helpful to dentists practicing implant treatments.