{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,9]],"date-time":"2026-05-09T07:11:12Z","timestamp":1778310672914,"version":"3.51.4"},"reference-count":0,"publisher":"Pakistan Journal of Medical Sciences","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Pak J Med Sci"],"abstract":"<jats:p>Objective: The aim of the study was to assess the failure loads and compressive stresses among bilayered press on Y-TZP (POZ) and press on metal (POM) crowns with different core-veneer thickness.\r\nMethods: Thirty metal and Y-TZP copings were fabricated using CAD-CAM technology with specified thickness. All copings were veneered with ceramic materials using hot pressing technique, with 2mm and 2.5mm thickness. The different coping veneer thickness of crowns resulted in six study groups, including, POM: Coping\/ veneer thickness of 0.7\/2mm (Gp1), 0.7\/2.5mm (Gp 2) and 1mm\/2mm (Gp 3)- POZ: 0.7\/2mm (Gp A), 0.7\/2.5mm (Gp B) and 1mm\/2mm (Gp C). Crowns were cemented to a standard implant analog and failure loads (FL) and compressive stress (CS) was ascertained by controlled load application in a universal testing machine. Data was analysed using ANOVA and multiple comparisons test.\r\nResults: The maximum FL were observed in the POM specimens with a C\/V ratio of 1\/2 (Group 3-1880.67\u00b1 256.78 N), however the lowest FL were exhibited by POZ crowns with 1\/2 C\/V ratio (Group C-611.89\u00b1 72.79 N). Mean FL and CS were significantly higher in POM compared to POZ crowns in respective groups. Increasing the coping-veneer thickness increased FL and CS among POM crowns. Increasing veneer and decreasing coping thickness improved FL and CS among POZ crowns.\r\nConclusions: Press on metal specimen showed higher resistance to fracture than Press on Y-TZP specimens. Improved failure loads were observed in thin coping and thick veneers among Press on Y-TZP crowns.\r\ndoi: https:\/\/doi.org\/10.12669\/pjms.36.7.2472\r\nHow to cite this:Vohra F, Shuwaish MB, Al-Deeb M, Alhamdan R, Alotaibi N, Abduljabbar T. Comparison of failure loads and compressive stress in Press on metal and Press on Y-TZP copings. Pak J Med Sci. 2020;36(7):1645-1650. doi: https:\/\/doi.org\/10.12669\/pjms.36.7.2472\r\nThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (http:\/\/creativecommons.org\/licenses\/by\/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.<\/jats:p>","DOI":"10.12669\/pjms.36.7.2472","type":"journal-article","created":{"date-parts":[[2020,9,25]],"date-time":"2020-09-25T04:05:25Z","timestamp":1601006725000},"source":"Crossref","is-referenced-by-count":1,"title":["Comparison of failure loads and compressive stress\u00a0in Press on metal and Press on Y-TZP copings"],"prefix":"10.12669","volume":"36","author":[{"given":"Fahim","family":"Vohra","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammed","family":"Bin Shuwaish","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Modhi","family":"Al Deeb","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rana","family":"Alhamdan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naif","family":"Alotaibi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tariq","family":"Abduljabbar","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"4935","published-online":{"date-parts":[[2020,10,19]]},"container-title":["Pakistan Journal of Medical Sciences"],"original-title":[],"link":[{"URL":"https:\/\/pjms.org.pk\/index.php\/pjms\/article\/download\/2472\/685","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/pjms.org.pk\/index.php\/pjms\/article\/download\/2472\/685","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,9]],"date-time":"2026-05-09T06:25:44Z","timestamp":1778307944000},"score":1,"resource":{"primary":{"URL":"https:\/\/pjms.org.pk\/index.php\/pjms\/article\/view\/2472"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,10,19]]},"references-count":0,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2020,9,23]]}},"URL":"https:\/\/doi.org\/10.12669\/pjms.36.7.2472","relation":{},"ISSN":["1681-715X","1682-024X"],"issn-type":[{"value":"1681-715X","type":"electronic"},{"value":"1682-024X","type":"print"}],"subject":[],"published":{"date-parts":[[2020,10,19]]}}}