Editorial Type:
Article Category: Research Article
 | 
Online Publication Date: 01 Oct 2009

Platform Switching and Bone Platform Switching

MD,
MD, and
MD
Page Range: 245 – 250
DOI: 10.1563/AAID-JOI-D-09-00022.1
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Abstract

Bone platform switching involves an inward bone ring in the coronal part of the implant that is in continuity with the alveolar bone crest. Bone platform switching is obtained by using a dental fixture with a reverse conical neck. A retrospective study was performed to evaluate the effectiveness of conventional vs reverse conical neck implants. In the period between May 2004 and November 2007, 86 patients (55 females and 31 males; median age, 53 years) were operated and 234 implants were inserted: 40 and 194 were conventional vs reverse conical neck implants, respectively. Kaplan-Meier algorithm and Cox regression were used to detect those variables associated with the clinical outcome. No differences in survival and success rates were detected between conventional vs reverse conical neck implants alone or in combination with any of the studied variables. Although bone platform switching leads to several advantages, no statistical difference in alveolar crest resorption is detected in comparison with reverse conical neck implants. We suppose that the proximity of the implant abutment junction to the alveolar crestal bone gives no protection against the microflora contained in the micrograph. Additional studies on larger series and a combination of platform switching and bone platform switching could lead to improved clinical outcomes.

Copyright: American College of Veterinary Internal Medicine
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F igures 1–2

Figure 1. Standard implant neck. Figure 2. Reverse conical neck.


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F igures 3–5

Figure 3. One spiral flare bevel and 2 spiral implants after the final prosthetic restoration. Figure 4. The control after 12 months. Figure 5. The bone platform is seen around the most cranial and narrow part of the reverse conical neck implant.


Contributor Notes

Francesco Carinci, MD, and Giorgio Brunelli, MD, are at the Department of Maxillofacial Surgery, University of Ferrara, in Ferrara, Italy, and Matteo Danza, MD, is at the Dental School, University of Chieti, in Chieti, Italy. Address correspondence to Dr Carinci, Chair of Maxillofacial Surgery, at Arcispedale S. Anna, Corso Giovecca 203, 44100 Ferrara, Italy. (e-mail: crc@unife.it)

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