{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T17:34:31Z","timestamp":1772991271155,"version":"3.50.1"},"reference-count":34,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2013,2,13]],"date-time":"2013-02-13T00:00:00Z","timestamp":1360713600000},"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":[[2014,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To compare the treatment outcome of 4 vs. 6\u00a0bar\u2010connected implants in the posterior region of the maxilla to support an overdenture during a 1\u2010year follow\u2010up period.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and methods<\/jats:title><jats:p>Sixty\u2010six edentulous patients with an insufficient amount of bone volume in the maxilla to place implants were asked to participate in this study. Randomization assigned patients to either 4 or 6 implants. In all patients, a maxillary sinus floor elevation procedure with bone from the iliac crest was performed, and after a 3\u2010month healing period, 4 or 6 dental implants were inserted in the maxillary posterior region in a one\u2010stage procedure. After 3\u00a0months of osseointegration, a bar\u2010supported overdenture was constructed. Implant survival, overdenture survival, clinical scores, peri\u2010implant bone height changes and patients' satisfaction were assessed. Study analysis was performed according a non\u2010inferiority design.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>All patients completed the one\u2010year follow\u2010up. After a functional period of 1\u2010year, implant survival was 100% in the 4 implants group and 99.5% in the 6 implants group. Overdenture survival was 100% in both groups. Mean clinical scores were very low and did not significantly differ between groups. Mean marginal bone resorption was 0.35\u00a0\u00b1\u00a00.31\u00a0mm and 0.46\u00a0\u00b1\u00a00.34\u00a0mm in the 4 and 6 implants group, respectively. Patients' satisfaction improved significantly in both groups, but did not differ between groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>A bar\u2010supported overdenture on 4 implants in the posterior maxillary region is not inferior to an overdenture supported by 6\u00a0bar\u2010connected dental implants.<\/jats:p><\/jats:sec>","DOI":"10.1111\/clr.12118","type":"journal-article","created":{"date-parts":[[2013,2,14]],"date-time":"2013-02-14T04:14:59Z","timestamp":1360815299000},"page":"560-566","source":"Crossref","is-referenced-by-count":23,"title":["A comparison between 4 and 6 implants in the maxillary posterior region to support an overdenture; 1\u2010year results from a randomized controlled trial"],"prefix":"10.1111","volume":"25","author":[{"given":"Wim","family":"Slot","sequence":"first","affiliation":[{"name":"Department of Fixed and Removable Prosthodontics Dental School University Medical Center Groningen University of Groningen Groningen The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gerry M.","family":"Raghoebar","sequence":"additional","affiliation":[{"name":"Department of Oral and Maxillofacial Surgery University Medical Center Groningen University of Groningen Groningen The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arjan","family":"Vissink","sequence":"additional","affiliation":[{"name":"Department of Oral and Maxillofacial Surgery University Medical Center Groningen University of Groningen Groningen The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Henny J.A.","family":"Meijer","sequence":"additional","affiliation":[{"name":"Department of Fixed and Removable Prosthodontics Dental School University Medical Center Groningen University of Groningen Groningen The Netherlands"},{"name":"Department of Oral and Maxillofacial Surgery University Medical Center Groningen University of Groningen Groningen The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,2,13]]},"reference":[{"key":"e_1_2_7_2_1","first-page":"11","article-title":"The long\u2010term efficacy of currently used dental implants: a review and proposed criteria for success","volume":"1","author":"Albrektsson T.","year":"1986","journal-title":"The International Journal of Oral & Maxillofacial Implants"},{"key":"e_1_2_7_3_1","first-page":"195","article-title":"Prosthodontic complications with implant overdentures: a systematic literature review","volume":"23","author":"Andreiotelli M.","year":"2010","journal-title":"The International Journal of Prosthodontics"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.3758\/BF03203630"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.0909-8836..t01-2-.x"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2842.2009.02020.x"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/clr.12001"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1708-8208.2011.00358.x"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0501.2003.140117.x"},{"key":"e_1_2_7_10_1","first-page":"343","article-title":"Implant\u2010supported maxillary overdentures retained with milled bars: maxillary anterior versus maxillary posterior concept. 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