Clinical evaluation of osseointegrated implants in Tokyo Dental College Hospital (third report): long-term observation of functioning survival rate of fixtures.
The objective of this report was to review 365 cases of Brånemark Implant Bridge including 1,444 fixtures in patients of Tokyo Dental College Chiba Hospital. The term of implantation was divided into several phases; less than 1 year, from 1 year to 3 years, from 3 years to 5 years, from 5 years to 7 years, from 7 years to 10 years, more than 10 years, and the survival rate was calculated for each phase. The removal rate of fixture after connecting the superstructure was 13% in maxillary cases and 2% in mandibular cases. The functioning survival rate in maxillary cases slightly decreased from 91% in less than 1 year to 87% after more than 10 years; however, the functioning survival rate in mandibular cases was about 99% in all periods. The removal rate of fixtures per patient was 23% in maxillary cases and 6% in mandibular ones. The average removal number of fixtures was 1.8 in maxillary cases and 1.2 in mandibular ones. The removal of the fixture occurred most frequently at less than 1 year in maxillary cases, but there was no tendency for a pattern of removal of fixture in mandibular cases.
Miyashita
Yuko
Y
Department of Removable Partial Prosthodontics, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan.
Arataki
Tomohiko
T
Nomura
Takao
T
Suzuki
Hiroki
H
Atsuta
Syunichi
S
Hotta
Hiromi
H
Shimamura
Ichiro
I
Adachi
Yasushi
Y
Kishi
Masataka
M
D000328:Adult; D000044:Dental Abutments / Q000706:statistics & numerical data; D015921:Dental Implants / Q000706:statistics & numerical data; D019094:Dental Prosthesis, Implant-Supported / Q000706:statistics & numerical data; D019232:Dental Restoration Failure; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous / Q000601:surgery; D007576:Jaw, Edentulous, Partially / Q000601:surgery; D008137:Longitudinal Studies; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D016348:Osseointegration; D012189:Retrospective Studies; D016019:Survival Analysis
D015921:Dental Implants