{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T18:55:54Z","timestamp":1790276154961,"version":"4.1.0"},"reference-count":29,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2025,7,31]],"date-time":"2025-07-31T00:00:00Z","timestamp":1753920000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical Oral Implants Res"],"published-print":{"date-parts":[[2025,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Aim<\/jats:title><jats:p>To evaluate changes in the peri\u2010implant marginal bone level at implants restored with narrow or standard\u2010diameter abutments after 12\u2009months.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material &amp; Methods<\/jats:title><jats:p>Twenty\u2010eight partially edentulous patients were randomly allocated to two groups. The test group consisted of 14 patients restored with a 2.9\u2009mm diameter abutment (21 implants), while the control group included 14 patients restored with a 4.1\u2009mm diameter abutment (17 implants). The primary outcome variable was the radiographic change in the peri\u2010implant marginal bone level at 12\u2009months, measured as the distance from the implant shoulder to the first bone\u2010to\u2010implant contact (fBIC). Secondary outcome variables included clinical peri\u2010implant parameters, the papilla index, biological and mechanical complications, patient\u2010reported outcomes (PROs) and professional aesthetic assessment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A per\u2010protocol analysis was conducted on the 22 patients who completed all scheduled follow\u2010up visits. At the patient level, the change in mean radiographic bone level from definitive prosthesis placement to 12\u2009months showed a reduction in the distance from the implant shoulder to the fBIC of 0.16\u2009\u00b1\u20090.31\u2009mm in the test group and 0.21\u2009\u00b1\u20090.34\u2009mm in the control group, with no statistically significant differences between the groups. No statistically significant differences were observed between the two groups for any of the secondary outcomes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Considering the limitations of this study, no significant differences in peri\u2010implant marginal bone levels were found between bone\u2010level implants restored with narrow and standard diameter abutments after 12\u2010month follow\u2010up. Additionally, no differences were observed in clinical variables, patient\u2010reported outcomes, or complications.<\/jats:p><\/jats:sec>","DOI":"10.1111\/clr.70005","type":"journal-article","created":{"date-parts":[[2025,7,31]],"date-time":"2025-07-31T12:34:32Z","timestamp":1753965272000},"page":"1335-1345","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Marginal Bone Changes at Bone\u2010Level Implants With Narrow or Standard Diameter Abutments: 1\u2010Year Results of\u00a0a Randomised Controlled Trial"],"prefix":"10.1111","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1611-5884","authenticated-orcid":false,"given":"Antonio","family":"Li\u00f1ares","sequence":"first","affiliation":[{"name":"Periodontology Unit, School of Dentistry University of Santiago de Compostela  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