{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,13]],"date-time":"2026-08-13T20:39:46Z","timestamp":1786653586783,"version":"build-2736575974"},"reference-count":27,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"1","license":[{"start":{"date-parts":[[2025,1,1]],"date-time":"2025-01-01T00:00:00Z","timestamp":1735689600000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-sa\/4.0"}],"content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2025,1]]},"abstract":"\n Aim:<\/jats:title>\n The aim of this study was to compare the marginal accuracy of polyetheretherketone (PEEK) and zirconia copings fabricated using computer-aided design\/computer-aided manufacturing (CAD\/CAM) technology, and to assess the impact of their material properties on accuracy when produced with a 4-axis milling system under controlled conditions.<\/jats:p>\n <\/jats:sec>\n \n Settings and Design:<\/jats:title>\n \n The study employed an\n in vitro<\/jats:italic>\n design with a stainless steel die model featuring a 6 mm axial wall height, a 6-degree total occlusal convergence, and a radial shoulder finish line.\n <\/jats:p>\n <\/jats:sec>\n \n Materials and Methods:<\/jats:title>\n \n Thirty stone dies were created from silicone impressions of the metal die and poured using type-IV dental stone. The dies were divided into two groups: Group-A (PEEK) copings and Group-B (zirconia) copings. All copings were fabricated using a CAD\/CAM system. Vertical marginal accuracy was assessed with a stereomicroscope and image analysis software at \u00d720 magnification. The marginal ga\n P<\/jats:italic>\n values were subjected to a student (independent)\n t<\/jats:italic>\n -test for statistical analysis.\n <\/jats:p>\n <\/jats:sec>\n \n Statistical Analysis Used:<\/jats:title>\n \n The statistical analysis involved a student (independent)\n t<\/jats:italic>\n -test to compare the marginal ga\n P<\/jats:italic>\n values between Group A (PEEK) and Group B (zirconia).\n <\/jats:p>\n <\/jats:sec>\n \n Results:<\/jats:title>\n \n The mean marginal discrepancy for Group A (PEEK) and Group B (zirconia) was 92.84 \u03bcm \u00b1 3.48 \u03bcm and 63.12 \u03bcm \u00b1 31.47 \u03bcm, respectively. A statistically significant variation (\n t<\/jats:italic>\n = 3.635,\n P<\/jats:italic>\n = 0.001) between the groups was observed, indicating better marginal accuracy with zirconia copings compared to PEEK copings.\n <\/jats:p>\n <\/jats:sec>\n \n Conclusion:<\/jats:title>\n \n Both PEEK and zirconia copings demonstrated vertical marginal discrepancies within the clinically acceptable limit of <120 \u03bcm. However, zirconia copings exhibited superior marginal accuracy in this\n in vitro<\/jats:italic>\n study.\n <\/jats:p>\n <\/jats:sec>","DOI":"10.4103\/jips.jips_8_24","type":"journal-article","created":{"date-parts":[[2025,1,3]],"date-time":"2025-01-03T09:04:48Z","timestamp":1735895088000},"page":"95-101","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":3,"title":["Evaluation of marginal accuracy of polyetheretherketone and zirconia copings fabricated using computer-aided design\/computer-aided manufacturing technique: An in vitro study"],"prefix":"10.4103","volume":"25","author":[{"given":"Manish","family":"Jangade","sequence":"first","affiliation":[{"name":"Department of Prosthodontics (Unit of Dentistry), Smt. Indira Gandhi Memorial Government Medical College, Kanker, Chhattishgarh, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ranu","family":"Sharma","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, Rungta College of Dental Sciences and Research, Bhilai, Chhattishgarh, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nishanth A.","family":"Sudharson","sequence":"additional","affiliation":[{"name":"Division of Prosthodontics, Christian Dental College, Ludhiana, Punjab, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raj","family":"Jain","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, Chhattisgarh Dental College and Hospital, Rajnandgaon, Chhattishgarh, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shailendra Kumar","family":"Sahu","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics, Chhattisgarh Dental College and 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