Influence of platform switching on bone-level alterations: a three-year randomized clinical trial

Enkling, Norbert; Jöhren, P.; Katsoulis, Joannis; Bayer, Stefan; Jervøe-Storm, P.-M.; Mericske, Regina; Jepsen, S. (2013). Influence of platform switching on bone-level alterations: a three-year randomized clinical trial. Journal of dental research, 92(12 Sup), 139S-145S. Sage 10.1177/0022034513504953

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The concept of platform switching has been introduced to implant dentistry based on clinical observations of reduced peri-implant crestal bone loss. However, published data are controversial, and most studies are limited to 12 months. The aim of the present randomized clinical trial was to test the hypothesis that platform switching has a positive impact on crestal bone-level changes after 3 years. Two implants with a diameter of 4 mm were inserted crestally in the posterior mandible of 25 patients. The intraindividual allocation of platform switching (3.3-mm platform) and the standard implant (4-mm platform) was randomized. After 3 months of submerged healing, single-tooth crowns were cemented. Patients were followed up at short intervals for monitoring of healing and oral hygiene. Statistical analysis for the influence of time and platform type on bone levels employed the Brunner-Langer model. At 3 years, the mean radiographic peri-implant bone loss was 0.69 ± 0.43 mm (platform switching) and 0.74 ± 0.57 mm (standard platform). The mean intraindividual difference was 0.05 ± 0.58 mm (95% confidence interval: -0.19, 0.29). Crestal bone-level alteration depended on time (p < .001) but not on platform type (p = .363). The present randomized clinical trial could not confirm the hypothesis of a reduced peri-implant crestal bone loss, when implants had been restored according to the concept of platform switching.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > School of Dental Medicine > Department of Prosthodontics [discontinued]

UniBE Contributor:

Enkling, Norbert, Katsoulis, Joannis, Bayer, Stefan, Mericske, Regina


600 Technology > 610 Medicine & health








Eveline Carmen Schuler

Date Deposited:

05 Feb 2014 17:07

Last Modified:

05 Dec 2022 14:27

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

alveolar bone loss, dental implant, dental implant-abutment connection, dental implant-abutment designs dental implant-abutment interface single-tooth dental implant




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