{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T12:47:34Z","timestamp":1774529254271,"version":"3.50.1"},"reference-count":32,"publisher":"Wiley","issue":"A100","license":[{"start":{"date-parts":[[2011,11,24]],"date-time":"2011-11-24T00:00:00Z","timestamp":1322092800000},"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":[[2013,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To examine the marginal fit of frameworks for implant\u2010supported single crowns built with or without the use of prefabricated plastic copings.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Sixty premolar sized metal crown frameworks for cemented implant restorations were prepared by two separate dental laboratories. Twenty were prepared with the use of original plastic copings for burn\u2010out (<jats:styled-content style=\"fixed-case\">OPC<\/jats:styled-content>), twenty without any prefabricated plastic coping (<jats:styled-content style=\"fixed-case\">WPC<\/jats:styled-content>), and finally twenty with modified plastic copings (<jats:styled-content style=\"fixed-case\">MPC<\/jats:styled-content>). Specimens were inspected at 100\u00d7 magnification. Marginal discrepancies can emerge at the vertical level as marginal gaps (<jats:styled-content style=\"fixed-case\">MG<\/jats:styled-content>) or horizontal differences in the circumferential precision of the restorations (<jats:styled-content style=\"fixed-case\">HEX<\/jats:styled-content>). <jats:styled-content style=\"fixed-case\">HEX<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">MG<\/jats:styled-content> were recorded at 10 different points in each metal crown. The <jats:styled-content style=\"fixed-case\">ANOVA<\/jats:styled-content> test was performed to estimate if there were statistically significant differences between the two dental laboratories. <jats:styled-content style=\"fixed-case\">ANOVA<\/jats:styled-content> Test was also used between Groups <jats:styled-content style=\"fixed-case\">OPC<\/jats:styled-content>,<jats:styled-content style=\"fixed-case\"> WPC<\/jats:styled-content>, and <jats:styled-content style=\"fixed-case\">MPC<\/jats:styled-content> to evaluate differences in the mean <jats:styled-content style=\"fixed-case\">MG<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">HEX<\/jats:styled-content> values. The <jats:styled-content style=\"fixed-case\">T<\/jats:styled-content>ukey's <jats:italic>post hoc<\/jats:italic> test was also performed to determine whether couples of data sets were different or not.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>No statistically significant differences regarding <jats:styled-content style=\"fixed-case\">HEX<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">MG<\/jats:styled-content> were found among the two dental laboratories. Significant differences were found among <jats:styled-content style=\"fixed-case\">OPC<\/jats:styled-content>,<jats:styled-content style=\"fixed-case\"> WPC<\/jats:styled-content>, and <jats:styled-content style=\"fixed-case\">MPC<\/jats:styled-content> groups both for <jats:styled-content style=\"fixed-case\">MG<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">HEX<\/jats:styled-content> (<jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.05). <jats:styled-content style=\"fixed-case\">T<\/jats:styled-content>ukey <jats:italic>post hoc<\/jats:italic> tests revealed that there were statistically significant differences (<jats:italic>P<\/jats:italic>\u2010value\u00a0&lt;\u00a00.05) in all pairs of groups and for both dimensions measured. The <jats:styled-content style=\"fixed-case\">OPC<\/jats:styled-content> group showed horizontal and vertical over\u2010extension. The <jats:styled-content style=\"fixed-case\">WPC<\/jats:styled-content> group margins appeared vertically under\u2010extended but horizontally over\u2010extended. The <jats:styled-content style=\"fixed-case\">WPC<\/jats:styled-content> groups showed unpredictability of results in the vertical dimension. The <jats:styled-content style=\"fixed-case\">MPC<\/jats:styled-content> group margins demonstrated horizontal over\u2010extension and appeared vertically slightly under\u2010extended. The frameworks belonging to this group appeared the most precise in the vertical dimension.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Casting <jats:styled-content style=\"fixed-case\"><jats:roman>Ni\/Cr<\/jats:roman><\/jats:styled-content> alloys without the use of prefabricated plastic components leads to unpredictable precision in the vertical marginal discrepancies. The use of plastic copings results in more predictable but horizontally and vertical over\u2010extended margins when the snap\u2010on mechanism is not removed properly after the casting due to the hardness of the <jats:styled-content style=\"fixed-case\"><jats:roman>Ni\/Cr<\/jats:roman><\/jats:styled-content> alloys. The removal of the snap\u2010on mechanism after the wax\u2010up and before casting (<jats:styled-content style=\"fixed-case\">MPC<\/jats:styled-content> group) results in more uniform and smaller vertical marginal discrepancies.<\/jats:p><\/jats:sec>","DOI":"10.1111\/j.1600-0501.2011.02379.x","type":"journal-article","created":{"date-parts":[[2011,11,24]],"date-time":"2011-11-24T10:59:33Z","timestamp":1322132373000},"page":"82-87","source":"Crossref","is-referenced-by-count":1,"title":["Marginal discrepancies of <scp><scp>Ni\/Cr<\/scp><\/scp> crowns for a soft tissue\u2010level, trans\u2010mucosal implant system"],"prefix":"10.1111","volume":"24","author":[{"given":"Dimitris","family":"Eliopoulos","sequence":"first","affiliation":[{"name":"Private Practice Nicosia Cyprus"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ferruccio","family":"Torsello","sequence":"additional","affiliation":[{"name":"Department of Periodontics and Prosthodontics Eastman Dental Hospital Roma Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luca","family":"Cordaro","sequence":"additional","affiliation":[{"name":"Department of Periodontics and Prosthodontics Eastman Dental Hospital Roma Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,11,24]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(85)90058-7"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(86)90106-X"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3913(96)90008-6"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1532-849X.1993.tb00373.x"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1067\/mpr.2002.128954"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-051X.1987.tb00979.x"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.prosdent.2005.09.017"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(91)90225-L"},{"key":"e_1_2_7_10_1","first-page":"62","article-title":"Prosthetic management of implants in the esthetic zone","volume":"19","author":"Higginbottom F.","year":"2004","journal-title":"The International Journal of Oral & Maxillofacial Implants"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(89)90170-4"},{"key":"e_1_2_7_12_1","first-page":"270","article-title":"Failures and complications in 391 consecutively inserted fixed prostheses supported by Branemark implants in edentulous jaws. 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