日本口腔インプラント学会誌
Online ISSN : 2187-9117
Print ISSN : 0914-6695
ISSN-L : 0914-6695
臨床研究
チタンおよびハイドロキシアパタイトコーティングのシリンダー形状インプラント体を応用した歯科インプラント治療の10~15 年間の臨床経過
藤野 茂和田 猛杉山 和孝
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ジャーナル フリー

2013 年 26 巻 3 号 p. 444-453

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Purpose: The purpose of the present clinical study was to examine the effect of differences in the surface materials of implants on the achievement of osseointegration and its long-term maintenance during a 10- to 15-year follow-up for two systems of cylinder implant, titanium implant and hydroxyapatite-coated implant, which were used for the prosthesis of posterior partially edentulous jaws.
Materials and Methods: The study evaluated 221 titanium implants in 75 patients (Ti implants) and 181 hydroxyapatite-coated implants in 66 patients (HA im plants), all of which were installed in available bone of posterior partially edentulous jaws during the period from 1994 to 1999 at a single center in Japan. The cumulative survival rates after 10 to 15 years were calculated by life table analysis and compared to evaluate the clinical courses.
Results: The cumulative survival rates after 10 to 15 years were 94.2% for Ti implants and 92.5% for HA implants, showing no significant difference in survival rate between the different implant bodies.
On comparison of survival rates of the implant bodies by elapsed period, Ti implants and HA implants showed 99.5% and 99.4%, respectively, for less than one year post-implantation, and 92.2% and 89.5%, respectively, for one year or more post-implantation, demonstrating no significant difference in survival rate during either period. However, in both implant bodies the survival rate tended to decrease over time at 4 to 5 years after loading.
In addition, incidence rates of implantation failure during the elapsed period showed no significant difference between Ti implants and HA implants in the cases of implant loss due to failed osseointegration, with 0.5% and 0.6%, respectively, during the post-implantation period of less than one year. Meanwhile, after one year or more post-implantation, the incidence of implant loss due to failed osseointegration was 6.1% for Ti implants and 0% for HA implants, and the incidence of implant loss due to peri-implantitis was 1.7% for Ti implants and 10.5% for HA implants, demonstrating a significant difference in incidence rate between the different implant bodies.
Discussion and Conclusion: No significant differences were found in the long-term survival rates between Ti implant bodies and HA implant bodies.
In addition, while both types of implant body showed successful survival rates during a post-implantation period of less than one year, at one year or more after implantation, the survival rates tended to decrease over time due to the development of failed osseointegration in Ti implants and the occurrence of peri-implantitis in HA implants.
Thus, it is suggested that, in order to achieve better long-term outcomes, occlusal adjustment for avoiding overloading on specific implant bodies is important for Ti implant bodies, whereas maintaining good oral hygiene for avoiding peri-implantitis is important for HA implant bodies, during a follow-up period of one year or more.

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© 2013 公益社団法人日本口腔インプラント学会
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