The purpose of this paper is to report on the survey of long-term (20 years or longer) single tooth implant cases. The subjects of this survey were 32 cylinder dental implants (POI® implant: KYOCERA) in 30 patients, placed at 3 clinics (members of Kyoto Institute of Implantology), lasting for 20 years or longer with the superstructure, as of May 2015. The survey items included: age at the time of implant placement, placed regions, size of implants, and attachment modalities of the superstructure. The average age at the time of implant placement was 47.31 years old (male 47.95, female 46.25 years old); 29 cases employed one-stage surgical placement procedure while 3 cases two-stage surgical process. As for the diameter of the implant fixture, in 17 cases was used 3.2 mm, 11 cases 3.7 mm, and 4 cases 4.2 mm while all the two-stage placement cases employed fixtures with a 3.7 mm diameter. As for the intraosseous length of the fixtures, 4 fixtures were 8 mm, 15 fixtures 10 mm, 8 fixtures 12 mm, and 5 fixtures 14 mm while in all the two-stage procedures were employed 10 mm long fixtures. As for the placed region, most of the implants for both the upper and lower jaw were placed in the posterior region while all the two-stage implants were placed in the premolar region. The breakdown of the attachment modalities of prostheses was as follows: 22 cases were cement-retained and 10 cases screw-retained while prostheses for two-stage implants were cement-retained.
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