BACKGROUND: Switching platform restorations seems to reduce the peri-implant bone resorption and to preserve the peri-implant soft tissues. AIM: The aim of the present human study was to compare histologically the peri-implant soft tissue in switching and traditional platform implants 4 years after restoration. MATERIALS AND METHODS: Forty-eight months after implant restoration, 37 peri-implant soft tissue samples from 14 patients were harvested from traditionally restored implants (control group) and from three different platforms mismatching 0.25-0.85 mm (test groups). At the harvesting time, all sites were clinically healthy. Samples were processed to evaluate the inflammatory infiltrate area [inflamed connective tissue (ICT)], the microvascular density (MVD) and the collagen content (AA%). RESULTS: At the analyses, no significant differences were found between groups in terms of ICT, MVD and AA% (p>0.05). In all groups, most samples with a well-preserved junctional epithelium showed a small and localized inflammatory infiltrated associated with not-well-oriented collagen fibres and an increased MVD. CONCLUSIONS: Forty-eight months after restoration, switching and traditional platform implants had similar histological peri-implant soft tissue features, despite different bone level changes detected radiographically and published in a previous parent study. The present study seems to confirm platform switching as a safe prosthetic concept leading to better maintenance of peri-implant bone levels. However, further histological studies are required to longitudinally confirm the present data.
RCT Entities:
BACKGROUND: Switching platform restorations seems to reduce the peri-implant bone resorption and to preserve the peri-implant soft tissues. AIM: The aim of the present human study was to compare histologically the peri-implant soft tissue in switching and traditional platform implants 4 years after restoration. MATERIALS AND METHODS: Forty-eight months after implant restoration, 37 peri-implant soft tissue samples from 14 patients were harvested from traditionally restored implants (control group) and from three different platforms mismatching 0.25-0.85 mm (test groups). At the harvesting time, all sites were clinically healthy. Samples were processed to evaluate the inflammatory infiltrate area [inflamed connective tissue (ICT)], the microvascular density (MVD) and the collagen content (AA%). RESULTS: At the analyses, no significant differences were found between groups in terms of ICT, MVD and AA% (p>0.05). In all groups, most samples with a well-preserved junctional epithelium showed a small and localized inflammatory infiltrated associated with not-well-oriented collagen fibres and an increased MVD. CONCLUSIONS: Forty-eight months after restoration, switching and traditional platform implants had similar histological peri-implant soft tissue features, despite different bone level changes detected radiographically and published in a previous parent study. The present study seems to confirm platform switching as a safe prosthetic concept leading to better maintenance of peri-implant bone levels. However, further histological studies are required to longitudinally confirm the present data.
Authors: José Paulo Macedo; Jorge Pereira; Brendan R Vahey; Bruno Henriques; Cesar A M Benfatti; Ricardo S Magini; José López-López; Júlio C M Souza Journal: Eur J Dent Date: 2016 Jan-Mar
Authors: Luigi Canullo; Jan Friedrich Dehner; David Penarrocha; Vittorio Checchi; Annalisa Mazzoni; Lorenzo Breschi Journal: Biomed Res Int Date: 2016-06-06 Impact factor: 3.411