{"id":3201,"date":"2019-01-01T00:00:00","date_gmt":"2018-12-31T23:00:00","guid":{"rendered":"https:\/\/www.ardentis.ch\/publications\/change-in-crown-to-implant-ratio-of-implants-placed-in-grafted-and-non-grafted\/"},"modified":"2026-03-10T15:05:06","modified_gmt":"2026-03-10T14:05:06","slug":"change-in-crown-to-implant-ratio-of-implants-placed-in-grafted-and-non-grafted","status":"publish","type":"publication","link":"https:\/\/www.ardentis.ch\/en\/publications\/change-in-crown-to-implant-ratio-of-implants-placed-in-grafted-and-non-grafted\/","title":{"rendered":"Change in crown-to-implant ratio of implants placed in grafted and non-grafted posterior maxillary sites: A 5-year prospective randomized study."},"content":{"rendered":"\n<p><strong>Authors<\/strong><\/p>\n<p>Nedir R., Nurdin N., Huynh-Ba G., Bischof M.<\/p>\n\n<p><strong>Title<\/strong><\/p>\n<p>Change in crown-to-implant ratio of implants placed in grafted and non-grafted posterior maxillary sites: A 5-year prospective randomized study.<\/p>\n\n<p><strong>Journal<\/strong><\/p>\n<p>The International Journal of Oral and Maxillofacial Implants 34:1231-1236, 2019.<\/p>\n\n<p><strong>Link<\/strong><\/p>\n<p><a href=\"https:\/\/www.ardentis.ch\/wp-content\/uploads\/2026\/05\/190607-Merheb-Soumis.pdf\">https:\/\/www.ardentis.ch\/wp-content\/uploads\/2026\/05\/190607-Merheb-Soumis.pdf<\/a><\/p>\n\n<p><strong>Abstract<\/strong><\/p>\n<p>Abstract\n\nPURPOSE:\n\nOsteotome sinus floor elevation (OSFE) is a technique aimed at simplifying implant placement in the posterior atrophic maxilla. The necessity of bone grafting under the elevated sinus membrane has been widely debated. The aim was to compare the evolution over 5 years of implant stability in sites grafted or left ungrafted.\n\nMATERIALS AND METHODS:\n\nA total of 12 patients (9 female and 3 male) presenting = 4 mm initial bone height (IBH) in the posterior maxillary sites were recruited. Implants (n = 37) were placed using OSFE. According to the randomisation, the sinuses received either bone graft (n = 20, control group) or no graft (n = 17, test group). Patients received both these treatments when both sinuses fulfilled the inclusion criteria. Control assessments were performed 1 week, 10 weeks, 12 weeks, and then 1 year, 3 years and 5 years after the implant placement. Periapical radiographs were taken and the implant stability quotient (ISQ) was measured at different time points.\n\nRESULTS:\n\nAt implant surgery, the mean ISQ was 58.9 \u00b1 11.2 for the test group and 53.8 \u00b1 10.2 for the control group; it plummeted 10 weeks after the implant placement and rose thereafter. Five years after the implant placement, the mean ISQ reached 80.8 \u00b1 4.2 for the control group, and 79.7 \u00b1 4.3 for the test group. The difference between the groups was not significant. The IBH significantly affected implant stability at implant insertion and 5 years after the implant insertion, but not at the other time points.\n\nCONCLUSIONS:\n\nThe implants performed using OSFE in ungrafted sites were as stable as the implants placed in grafted sites.<\/p>\n\n<p><strong>Keywords<\/strong><\/p>\n<p>Keywords: bone graft, implant stability quotient (ISQ), osteotome sinus floor elevation (OSFE), posterior maxilla, resonance frequency analysis (RFA)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Authors Nedir R., Nurdin N., Huynh-Ba G., Bischof M. Title Change in crown-to-implant ratio of implants placed in grafted and non-grafted posterior maxillary sites: A 5-year prospective randomized study. Journal The International Journal of Oral and Maxillofacial Implants 34:1231-1236, 2019. Link https:\/\/www.ardentis.ch\/wp-content\/uploads\/2026\/05\/190607-Merheb-Soumis.pdf Abstract Abstract PURPOSE: Osteotome sinus floor elevation (OSFE) is a technique aimed at [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":5090,"template":"","meta":{"video_url":"","sticky":false},"publication_tag":[],"class_list":["post-3201","publication","type-publication","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Change in crown-to-implant ratio of implants | Ardentis<\/title>\n<meta name=\"description\" content=\"Change in crown-to-implant ratio of implants placed in grafted and non-grafted posterior maxillary sites: A 5-year prospective randomized study.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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