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Quintessence Int 47 (2016), No. 9     22. Sep. 2016
Quintessence Int 47 (2016), No. 9  (22.09.2016)

Page 759-765, doi:10.3290/j.qi.a36563, PubMed:27446996


Effect of roughened micro-threaded implant neck and platform switching on marginal bone loss: a multicenter retrospective study with 6-year follow-up
Di Stefano, Danilo Alessio / Giacometti, Edoardo / Greco, Gian Battista / Gastaldi, Giorgio / Gherlone, Enrico
Objective: The aim of this retrospective study was to evaluate medium-term marginal peri-implant bone loss following placement of root-form implants featuring a micro-threaded rough-surfaced neck and a platform-switched implant-abutment connection.
Method and Materials: Records were identified of patients treated with such implants over a 3-year period at three Italian dental centers. Patient radiographs were digitized and subjected to computerized analysis of peri-implant bone resorption.
Results: Records of 112 patients who received 257 implants were analyzed. Although implant diameters and lengths varied, all had a 0.3-mm platform-switching width and a 2.5-mm high micro-threaded neck. All patients healed uneventfully, and no peri-implant infection, implant mobility, or radiolucency around the implant were detected at any follow-up control. At the 72-month control (average 71 ± 5 months) all implants were successful according to Albrektsson and Zarb's criteria. At implant level, average peri-implant bone resorption was 0.18 ± 0.12 mm at 6 months, 0.22 ± 0.15 mm at 12 months, 0.23 ± 0.16 mm at 24 months, 0.25 ± 0.17 mm at 36 months, 0.26 ± 0.15 mm at 48 months, and stable at subsequent controls, regardless of the implant diameter and length. At patient level, a similar trend was observed, with crestal bone loss stabilizing from 48 months onward.
Conclusion: The surface, geometry, and platform-switching features of the implant under investigation allowed effective bone preservation on a medium-term basis.

Keywords: implant, marginal crest bone, micro-thread, platform switching, rough surface
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