{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T12:19:45Z","timestamp":1789993185089,"version":"4.0.1"},"reference-count":28,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2012,12,5]],"date-time":"2012-12-05T00:00:00Z","timestamp":1354665600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"DeguDent GmbH and Dentsply DeTrey"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Oral Rehabilitation"],"published-print":{"date-parts":[[2013,3]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>This practice\u2010based study evaluates the clinical performance of conventionally luted metal\u2013ceramic and zirconia molar crowns fabricated with pronounced anatomical core design and a prolonged cooling period of the veneering porcelain. Fifty\u2010three patients were treated from 07\/2008 until 07\/2009 with either metal\u2013ceramic crowns (MCC) (high\u2010noble alloy\u00a0+\u00a0low\u2010fusing porcelain) or zirconia crowns (Cercon System, DeguDent, Germany). Forty\u2010nine patients (30 women\/19 men) with 100 restorations (metal\u2013ceramic: 48\/zirconia: 52, mean observational period: 36\u00b75\u00a0\u00b1\u00a06\u00a0months) participated in a clinical follow\u2010up examination and were included in the study. Time\u2010dependent survival (<jats:italic>in situ<\/jats:italic> criteria), success (event\u2010free restorations) and chipping rates (defects of the veneering ceramics) were calculated according to the Kaplan\u2013Meier method and analysed in relation to the crown fabrication technique, using a Cox regression model (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00\u00b705). Three complete failures (metal\u2013ceramic: 1, zirconia: 2) were recorded (survival rate after 3\u00a0years: metal\u2013ceramic: 97\u00b76%, zirconia: 95\u00b72%). Of the metal\u2013ceramic restorations, 90\u00b79% remained event\u2010free (two ceramic fractures, one endodontic treatment), whereas the success rate for the zirconia was 86\u00b78% (two ceramic fractures, one endodontic treatment, one secondary caries). No significant differences in survival (<jats:italic>P<\/jats:italic>\u00a0=\u00a00\u00b753), success (<jats:italic>P<\/jats:italic>\u00a0=\u00a00\u00b749) and ceramic fracture rates (<jats:italic>P<\/jats:italic>\u00a0=\u00a00\u00b757) were detected. The combination of a pronounced anatomical core design and a modified firing of the veneering porcelain for the fabrication of zirconia molar crowns resulted in a 3\u2010year survival, success and chipping rate comparable to <jats:styled-content style=\"fixed-case\">MCC<\/jats:styled-content>.<\/jats:p>","DOI":"10.1111\/joor.12018","type":"journal-article","created":{"date-parts":[[2012,12,5]],"date-time":"2012-12-05T20:43:19Z","timestamp":1354740199000},"page":"228-237","source":"Crossref","is-referenced-by-count":39,"title":["Practice\u2010based clinical evaluation of metal\u2013ceramic and zirconia molar crowns: 3\u2010year results"],"prefix":"10.1111","volume":"40","author":[{"given":"S.","family":"Rinke","sequence":"first","affiliation":[{"name":"Private Practice Hanau Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Sch\u00e4fer","sequence":"additional","affiliation":[{"name":"Private Practice Hanau 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