{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T09:14:24Z","timestamp":1782897264193,"version":"3.54.5"},"reference-count":29,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2023,8,10]],"date-time":"2023-08-10T00:00:00Z","timestamp":1691625600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clin Implant Dent Rel Res"],"published-print":{"date-parts":[[2023,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>Maxillary implant overdenture therapy is a good treatment option for treating patients experiencing problems with their conventional maxillary denture. Retaining the overdenture with four implants and a bar attachment system serves as the current gold standard. However, there is a demand for less costly and less invasive treatment options. The aim of this randomized controlled trial was to compare marginal bone level change (MBLC), implant and overdenture survival, clinical, masticatory, and patient\u2010related outcomes (PROMs) of maxillary implant overdentures with either two or four implants and a bar attachment system.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Forty edentulous participants were randomly allocated to two groups (<jats:italic>n<\/jats:italic>\u2009=\u200920), to receive either two or four implants in the maxilla. After healing, all the participants received an implant overdenture retained by a bar attachment system. All the participants were evaluated 1 and 12\u2009months after overdenture placement. The primary outcome was MBLC. Secondary outcomes were implant and overdenture survival, clinical, masticatory, and PROMs. The outcomes were analyzed using parametric and non\u2010parametric tests.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>MBLC was \u22120.03\u2009mm in the 2\u2010implant group and \u22120.16\u2009mm in the 4\u2010implant group (<jats:italic>p<\/jats:italic>\u2009=\u20090.21). Implant survival was 83.3% in the 2\u2010implant group and 94.4% in the 4\u2010implant group (<jats:italic>p<\/jats:italic>\u2009=\u20090.03). The median pocket depth change and clinical outcomes were low, and masticatory performance along with PROMs improved in both groups and did not differ significantly between them.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Maxillary 4\u2010implant overdentures perform better than maxillary 2\u2010implant overdentures with a bar attachment system in terms of implant and overdenture survival and therefore remains the gold standard. However, both overdentures perform similarly in terms of MBLC, clinical, masticatory, and PROMs.<\/jats:p><\/jats:sec>","DOI":"10.1111\/cid.13262","type":"journal-article","created":{"date-parts":[[2023,8,11]],"date-time":"2023-08-11T05:51:16Z","timestamp":1691733076000},"page":"1138-1148","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Two or four implants for maxillary overdentures in edentulous patients: 1\u2010year results of a randomized controlled trial"],"prefix":"10.1111","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3689-4061","authenticated-orcid":false,"given":"Pieter","family":"Onclin","sequence":"first","affiliation":[{"name":"Department of Oral and Maxillofacial Surgery University Medical Center Groningen and University of Groningen  Groningen The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0540-3741","authenticated-orcid":false,"given":"Caroline M.","family":"Speksnijder","sequence":"additional","affiliation":[{"name":"Department of Oral\u2010Maxillofacial Surgery and Special Dental Care University Medical Center Utrecht, Utrecht University  Utrecht The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2581-4361","authenticated-orcid":false,"given":"Arjan","family":"Vissink","sequence":"additional","affiliation":[{"name":"Department of Oral and Maxillofacial Surgery University Medical Center Groningen and University of Groningen  Groningen The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1702-6031","authenticated-orcid":false,"given":"Henny J. A.","family":"Meijer","sequence":"additional","affiliation":[{"name":"Department of Oral and Maxillofacial Surgery University Medical Center Groningen and University of Groningen  Groningen The Netherlands"},{"name":"Department of Implant Dentistry University of Groningen and University Medical Center Groningen  Groningen The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3578-7141","authenticated-orcid":false,"given":"Gerry M.","family":"Raghoebar","sequence":"additional","affiliation":[{"name":"Department of Oral and Maxillofacial Surgery University Medical Center Groningen and University of Groningen  Groningen The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,8,10]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/jcpe.13726"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/cid.12721"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/cid.13034"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/clr.12169"},{"key":"e_1_2_11_6_1","first-page":"137","article-title":"Marginal bone loss and prosthetic maintenance of bar\u2010retained implant\u2010supported overdentures: a prospective study","volume":"25","author":"Akca K","year":"2010","journal-title":"Int J Oral Maxillofac Implants"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600\u20100501.2010.02079.x"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijom.2018.06.002"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1708\u20108208.2010.00332.x"},{"issue":"2","key":"e_1_2_11_10_1","first-page":"253","article-title":"Implant\u2010supported overdentures: a longitudinal prospective study","volume":"13","author":"Bergendal T","year":"1998","journal-title":"Int J Oral Maxillofac Implants"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/cid.12325"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/clr.12724"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600\u20100501.2008.01664.x"},{"key":"e_1_2_11_14_1","first-page":"35","article-title":"Maxillary removable prostheses retained by telescopic crowns on two implants or two canines","volume":"27","author":"Weng D","year":"2007","journal-title":"Int J Periodontics Restorative Dent"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/clr.12863"},{"key":"e_1_2_11_16_1","doi-asserted-by":"publisher","DOI":"10.1186\/s40729\u2010020\u201000221\u2010x"},{"key":"e_1_2_11_17_1","doi-asserted-by":"publisher","DOI":"10.3109\/00016356309011240"},{"key":"e_1_2_11_18_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1399-302X.1987.tb00298.x"},{"key":"e_1_2_11_19_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0722.2009.00675.x"},{"key":"e_1_2_11_20_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2842.2011.02229.x"},{"key":"e_1_2_11_21_1","first-page":"498","article-title":"A randomised prospective clinical trial on the effectiveness of three treatment modalities for patients with lower denture problems. 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