{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T18:59:42Z","timestamp":1780599582725,"version":"3.54.1"},"reference-count":34,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2011,4,4]],"date-time":"2011-04-04T00:00:00Z","timestamp":1301875200000},"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":[[2012,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>\n            <jats:bold>Objectives: <\/jats:bold> To identify risk factors for early failure of immediately placed implants in molar regions associated with three bone regenerative techniques.<\/jats:p><jats:p>\n            <jats:bold>Methods: <\/jats:bold> Ninety\u2010two patients (44 women and 48 men; mean age 50 years, 35 smokers and 57 non\u2010smokers) in need of a single implant crown to replace a molar were included. After placing the implant, patients were randomized to one of three treatment groups for bone reconstruction of remaining periimplant defects: Autologous bone (AB) chips, Ossix membrane (OM) or a combination of AB chips and OM. The implant was submerged, and after 4 months of healing a re\u2010entry surgery was made to connect a healing abutment. Implants with a dehiscence on \u22652 sites (mesial\/distal\/oral\/buccal) together with\u226550% visible threads, were judged as failures. A series of simple logistic regression analyses were performed to identify risk factors for failure among the following independent variables: sex, jaw, smoking status, plaque, bleeding on probing, fistula, extraction reason, mean initial periimplant defect size, treatment group, implant length, buccal bone dehiscence (BBD), soft\u2010tissue dehiscence and infection. The identified risk factors entered a multiple logistic regression analysis.<\/jats:p><jats:p>\n            <jats:bold>Results: <\/jats:bold> Fifteen implants failed before abutment operation (13 explantations\/two non\u2010osseointegrated). Treatment group had no impact on failure. Risk factors for failure were: Smoking &gt;10\u2003cigarettes\/day (odds ratio [OR]=9.29, confidence interval [CI]=1.21\u201371.16), BBD (OR=11.43, CI=1.34\u201397.74) and infection (OR=36.7, CI=2.75\u2013489.31).<\/jats:p><jats:p>\n            <jats:bold>Conclusions: <\/jats:bold> Implants placed immediately after extraction of a molar were associated with a high risk for failure at abutment operation. There was no difference in failure rate between three bone reconstructive techniques.<\/jats:p><jats:p>\n            <jats:bold>To cite this article:<\/jats:bold>\u2028Urban T, Kostopoulos L, Wenzel A. Immediate implant placement in molar regions: risk factors for early failure.\u2028<jats:italic>Clin. Oral Impl. Res<\/jats:italic>. <jats:bold>23<\/jats:bold>, 2012; 220\u2013227. \u2028doi: 10.1111\/j.1600\u20100501.2011.02167.x<\/jats:p>","DOI":"10.1111\/j.1600-0501.2011.02167.x","type":"journal-article","created":{"date-parts":[[2011,4,4]],"date-time":"2011-04-04T06:17:34Z","timestamp":1301897854000},"page":"220-227","source":"Crossref","is-referenced-by-count":44,"title":["Immediate implant placement in molar regions: risk factors for early failure"],"prefix":"10.1111","volume":"23","author":[{"given":"Thomas","family":"Urban","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lambros","family":"Kostopoulos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ann","family":"Wenzel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,4,4]]},"reference":[{"key":"e_1_2_6_2_1","first-page":"11","article-title":"The long\u2010term efficacy of currently used dental implants","volume":"1","author":"Albrektsson T.","year":"1986","journal-title":"The International Journal of Oral & Maxillofacial Implants"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-051X.2007.01077.x"},{"key":"e_1_2_6_4_1","first-page":"242","article-title":"Wide\u2010diameter implant placement and internal sinus membrane elevation in the 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