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research _ platform switching I chetto R, Celletti R. Evaluation of Peri-Implant Bone loss around plat- form-switched implants Results: This data confirm the important role of the microgap between the implant and abutment in the remodeling of the peri-implant crestal bone. Platform switching seems to reduce peri-implant crestal bone resorption and increase long-term pre- dictability of implant therapy. Table 5 J Periodontol. 2001 Oct Hermann JS ,Schoolfield JD, Schenk RK, Buser D, Cochran DL Influence of the size of the microgap on crestal bone changes around titanium implants. A histometric evaluation of unloaded non-submerged implants in canine mandible. Results:Allimplantsinthenon-weldedgrouphad significantly increased amounts of crestal bone loss compared to the welded group. These findings demonstrate that crestal bone changes around 2- piece non-submerged titanium implants are signifi- cantly influenced by possible movements between implants and abutments, but not by the size of the microgap. Significant crestal bone loss occurs in 2- pieceimplantconfigurationsevenwiththesmallest- sized microgaps (<10 micron) in combination with possible movements between implant components. Table 6 JOMI 2006; 21:777–784 Michael R. Norton Multiple Single-Tooth Restaurations in the Posterior Jaws: Maintenance of Marginal Bone Levels with Reference to the Implant-Abutment Microgap Results: The way in which bone responds around an implant may be due to multiple factors. It is also plausiblethatthetightconicaljoint,withitshighre- sistancetobendingmomentsandamicrogapofonly 2–4 microns, contribute significantly to the mainte- nance of marginal bone. With an overall mean marginal bone loss of only 0.65 mm from the microgap the data of this study is incloseagreementwithnumerousstudiesontheAs- tra Tech System. The finding that some of the implants have demonstratedboneabovethelevelofthemicrogap cast doubt on the theory of biologic width, with re- gardtotheinfluenceofthelocationoftheimplant- abutmentmicrogapwhichrequiresre-evaluation._ Editorialnote:Thepublicationwillbecontinuedwith PartIIinthenextissue. Laser weldedA < 10 micron 1.06 mm+/- 0.46 mm Laser welded B ~ 50 micron 1.28 mm+/- 0.47 mm Laser welded C 100 micron 1.17 mm+/- 0.51 mm Abutm.with screw D < 10 micron 1.72 mm+/- 0.49 mm Abutm.with screw E ~ 50 micron 1.71 mm+/- 0.43 mm Abutm.with screw F 100 micron 1.65 mm+/- 0.37 mm Type of implant Size of the Mean crestal bone levels micrograp after 3 months* Maxilla 80 0.56 mm 48 125 Mandible 93 0.70 mm Site No.of Mean Two stage Transmucosal implants marginal surgical surgical (173) Astra bone loss protocol protocol Virgil Koszegi Stoianov Office:Str.Paciurea No.5 300036Timisoara,Romania Tel.:+40 356433733 Mobile:+40 723573443 E-mail:virgil.koszegi@medicis.ro _contact implants Tab. 5 Tab. 6 laserinternational magazine of laser dentistry I hereby agree to receive a free trail subscription of laser international magazine of laser dentistry (4 issues per year). I would like to subscribe to laser for € 44* for German customers, € 46* for customers outside Germany, unless a written cancellation is sent within 14 days of the receipt of the trial subscription. The subscrip- tion will be renewed automatically every year until a written cancellation is sent to OEMUS MEDIA AG, Holbein- str. 29, 04229 Leipzig, Germany, six weeks prior to the renewal date. Replyper Fax +49-(0) 3 41/4 84 74-2 90 to OEMUS MEDIA AG or per E-mail to grasse@oemus-media.de ¢ Subscribe now! Last Name, First Name Street Signature ZIP/City/ Country E-mail Notice of revocation: I am able to revoke the subscription within 14 days after my order by sending a written cancellation to OEMUS MEDIA AG, Holbeinstr. 29, 04229 Leipzig, Germany. OEMUS MEDIA AG Holbeinstraße 29, 04229 Leipzig, Germany Tel.: +49-(0) 3 41/4 84 74-0, Fax: +49-(0) 3 41/4 84 74-2 90 E-Mail: grasse@oemus-media.de One issue free of charge! *Prices include shipping and VAT IM 1/10 AD

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