{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,5]],"date-time":"2026-01-05T04:07:34Z","timestamp":1767586054584},"reference-count":72,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2012,12,20]],"date-time":"2012-12-20T00:00:00Z","timestamp":1355961600000},"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":[[2014,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To evaluate the effect of opposing structures in crestal bone levels around single\u2010tooth implants.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and methods<\/jats:title><jats:p>A retrospective cohort study design was conducted. Descriptive statistics, univariate and multifactor mixed\u2010effects regression models, adjusted for multiple implants in the same patient were utilized to evaluate the effect of opposing structures in crestal bone levels after insertion of single\u2010tooth replacements.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Eighty\u2010one subjects who received 320 <jats:styled-content style=\"fixed-case\">B<\/jats:styled-content>icon implants were included in the present study. Two hundred and thirty\u2010one implant restorations were opposing natural teeth, 75 implants were opposing implant\u2010supported restorations, 10 implants had no opposing structure and four implants were opposed by a complete denture. The average change in crestal bone levels overtime (Av<jats:styled-content style=\"fixed-case\">BL<\/jats:styled-content>) on implants opposing natural teeth and implant\u2010supported restorations was \u22120.20 and \u22120.62\u00a0mm, respectively. Hydroxyapatite\u2010coated (<jats:styled-content style=\"fixed-case\">HA<\/jats:styled-content>) mandibular implants opposing natural teeth demonstrated Av<jats:styled-content style=\"fixed-case\">BL<\/jats:styled-content> of +0.01 (indicating bone gain), whereas titanium\u2010plasma sprayed (<jats:styled-content style=\"fixed-case\">TPS<\/jats:styled-content>)\u2010coated mandibular implants opposing implants restored with composite abutment bases demonstrated Av<jats:styled-content style=\"fixed-case\">BL<\/jats:styled-content> of \u22121.95\u00a0mm. When the structure opposing an <jats:styled-content style=\"fixed-case\">HA<\/jats:styled-content>\u2010coated mandibular implant was a natural tooth, it was a predictor of peri\u2010implant bone gain (<jats:italic>P\u00a0<\/jats:italic>=<jats:italic>\u00a0<\/jats:italic>0.007). While <jats:styled-content style=\"fixed-case\">TPS<\/jats:styled-content>\u2010coated mandibular implants, which had been restored with composite abutment bases, were correlated with peri\u2010implant bone loss when opposed by implant\u2010supported restorations (<jats:italic>P<\/jats:italic>\u00a0=\u00a00.003).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This study suggests that the type of opposing structure plays a significant role in mandibular crestal bone levels surrounding single\u2010tooth implants following crown insertion but this effect differ around implants with dissimilar surface coatings and can be exacerbated by local irritating factors.<\/jats:p><\/jats:sec>","DOI":"10.1111\/clr.12087","type":"journal-article","created":{"date-parts":[[2012,12,21]],"date-time":"2012-12-21T22:15:38Z","timestamp":1356128138000},"source":"Crossref","is-referenced-by-count":18,"title":["The effect of opposing structures, natural teeth vs. implants on crestal bone levels surrounding single\u2010tooth implants"],"prefix":"10.1111","volume":"25","author":[{"given":"Rainier A.","family":"Urdaneta","sequence":"first","affiliation":[{"name":"Private Practice Implant Dentistry Centre Boston MA USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joseph","family":"Leary","sequence":"additional","affiliation":[{"name":"Private practice Norwood MA USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kimberly M.","family":"Panetta","sequence":"additional","affiliation":[{"name":"Dental Hygienist, Implant Dentistry Centre Norwood Boston, MA USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sung\u2010Kiang","family":"Chuang","sequence":"additional","affiliation":[{"name":"Department of Oral and Maxillofacial Surgery Massachusetts General Hospital and Harvard School of Dental Medicine Boston MA 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