{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T15:31:29Z","timestamp":1784129489446,"version":"3.55.0"},"reference-count":45,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2011,2,15]],"date-time":"2011-02-15T00:00:00Z","timestamp":1297728000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinical Oral Implants Res"],"published-print":{"date-parts":[[2011,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p><jats:bold>Objective: <\/jats:bold> The concept of platform switching has been introduced to implant dentistry based on observations of reduced peri\u2010implant bone loss. However, randomized clinical trials are still lacking. This study aimed to test the hypothesis that platform switching has a positive impact on crestal bone\u2010level changes.<\/jats:p><jats:p><jats:bold>Material and methods: <\/jats:bold> Two implants with diameters of 4\u2003mm were inserted epicrestally into one side of the posterior mandibles of 25 subjects. After 3 months of submerged healing, the reentry surgery was performed. On the randomly placed test implant, an abutment 3.3\u2003mm in diameter was mounted, resulting in a horizontal circular step of 0.35\u2003mm (platform switching). The control implant was straight, with an abutment 4\u2003mm in diameter. Single\u2010tooth crowns were cemented provisionally. All patients were monitored at short intervals over the course of 1 year. Standardized radiographs and microbiological samples from the implants' inner spaces were obtained at baseline (implant surgery), and after 3, 4, and 12 months.<\/jats:p><jats:p><jats:bold>Results: <\/jats:bold> After 1 year, the mean radiographic vertical bone loss at the test implants was 0.53\u00b10.35\u2003mm and at the control implants, it was 0.58\u00b10.55\u2003mm. The mean intraindividual difference was 0.05\u00b10.56\u2003mm, which is significantly &lt;0.35\u2003mm (<jats:italic>P<\/jats:italic>=0.0093, <jats:italic>post hoc<\/jats:italic> power 79.9%). The crestal bone\u2010level changes depended on time (<jats:italic>P<\/jats:italic>&lt;0.001), but not on platform switching (<jats:italic>P<\/jats:italic>=0.4). The implants' internal spaces were contaminated by bacteria, with no significant differences in the total counts between the test and the control at any time point (<jats:italic>P<\/jats:italic>=0.98).<\/jats:p><jats:p><jats:bold>Conclusions: <\/jats:bold> The present randomized clinical trial could not confirm the hypothesis of a reduced peri\u2010implant bone loss at implants restored according to the concept of platform switching.<\/jats:p><jats:p><jats:bold>To cite this article:<\/jats:bold>\n          \u2028Enkling N, J\u00f6hren P, Klimberg V, Bayer S, Mericske\u2010Stern R, Jepsen S. Effect of platform switching on peri\u2010implant bone levels: a randomized clinical trial. \u2028<jats:italic>Clin. Oral Impl. Res<\/jats:italic>. <jats:bold>22<\/jats:bold>, 2011; 1185\u20131192.\u2028doi: 10.1111\/j.1600\u20100501.2010.02090.x<\/jats:p>","DOI":"10.1111\/j.1600-0501.2010.02090.x","type":"journal-article","created":{"date-parts":[[2011,2,15]],"date-time":"2011-02-15T13:36:07Z","timestamp":1297776967000},"page":"1185-1192","source":"Crossref","is-referenced-by-count":67,"title":["Effect of platform switching on peri\u2010implant bone levels: a randomized clinical trial"],"prefix":"10.1111","volume":"22","author":[{"given":"Norbert","family":"Enkling","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"J\u00f6hren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victoria","family":"Klimberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Bayer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Regina","family":"Mericske\u2010Stern","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S\u00f8ren","family":"Jepsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,2,15]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-051X.1997.tb00230.x"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-051X.1989.tb02140.x"},{"key":"e_1_2_6_4_1","first-page":"365","volume-title":"Proceedings 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