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Comparing Implant Telescope and Implant Overdenture for Biological and Hardware Complications: Results of a Long-term Follow-up Investigation


Kazuhiko Inoue, DDS, PhD – Tokyo Medical and Dental University Graduate School

Masanori Nashimoto, DDS, PhD – General Implant Research Center

Yasuki Sekiya, DDS – General Implant Research Center

Yuzo Terayama – Inoue Dental Clinic, Medical Corpolate Yamabukikai

Makoto Shiota, DDS, PhD – Associate Professor, Tokyo Medical and Dental University Graduate School


Purpose of the Study: We investigated a long-term survey on the comparison of the biological and hardware complications with removable prostheses, including implant overdenture and implant telescope (with natural teeth), in full-mouth reconstruction.

Methods: Thirty-three patients of average age 74 ± 9 years (11 males and 22 females; upper: 23 cases and lower: 17 cases) using implant telescope (included Double crown, 40 cases) and implant overdentures (8 cases) were studied from 2001 to 2019 for their clinical follow-up. Biological and hardware complications in 164 implants (Straumann®, Switzerland) and 71 teeth (average denture wearing period: 10 years and 1 month ± 5 years and 2 months) were evaluated statistically.

Results: The survival rates of the implant and natural teeth were 97% and 90%, respectively, indicating no significant difference between them. Hardware complications with implant telescopes (average: 0.8 cases/year) were less than those of implant overdentures (average: 4 cases/year), with a statistically significant difference (P < 0.05). In telescope type of prosthesis, detachment of the inner cap occurred in 23.4% cases, while implant body breakage was recognized only in one case.

Conclusion: Long-term hardware complications with implant telescopes were considerably lesser than that of implant overdentures. It was suggested that implant telescopes recovered the occlusal support over a long period.

Articles: 1. Besimo C, Graber G. A new concept of overdentures with telescope crowns on osseointegrated implants. Int J Periodontics Restorative Dent. 1994; 14: 486−495. 2. Ohkubo C, Kobayashi M, Okamoto N, Hosoi T, Kurtz KS, Murata T. Implant overdenture using Konus telescope on one-piece implant: A case report. Eur J Prosthodont Restor Dent. 2009; 17: 188−191. 3. Kern JS, Kern T, Wolfart S, Heussen N. A systematic review and meta-analysis of removable and fixed implant-supported prostheses in edentulous jaws: Post-loading implant loss. Clin Oral Implants Res. 2016; 27:174−195.

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