{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T16:33:23Z","timestamp":1787762003807,"version":"build-2784847793"},"reference-count":49,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"6","content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2023,6]]},"abstract":"<jats:title>\n                    A\n                    <jats:sc>BSTRACT<\/jats:sc>\n                  <\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Polyether ether ketone (PEEK) has emerged as a new thermoplastic material with potential applications as a restorative material. Aim: This study aimed to evaluate the marginal adaptation of PEEK copings compared to zirconia copings using field emission scanning electron microscopy.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and Methods:<\/jats:title>\n                    <jats:p>\n                      A freshly extracted maxillary central incisor was prepared for a full-coverage restoration following standard principles of tooth preparation. The tooth was sent to a laboratory for fabrication of samples using computer-aided design and manufacturing (CAD\/CAM). Twenty samples of polyether ether ketone (PEEK) copings (group A) and 20 of zirconia copings were fabricated (group B). The copings were scanned under a field emission scanning electron microscope and measurements were taken at four distinct points. The marginal adaptation over the buccal, lingual, mesial, and distal margins for both groups was evaluated. One-way analysis of variance (ANOVA) and independent\n                      <jats:italic toggle=\"yes\">t<\/jats:italic>\n                      test were applied.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      Our findings indicate that PEEK showed better marginal adaptation than zirconia at all measurement points. The mean marginal gap value of the PEEK group was 33.99 \u00b1 8.81 \u03bcm and of the zirconia group was 56.21 \u00b1 15.07 \u03bcm. On comparing marginal adaptation among the mesial, distal, buccal, and lingual aspects, PEEK showed better adaptation on all four margins, with the best adaptation on the buccal margin that had the lowest mean gap value of 29.27 \u00b1 6.07 \u03bcm. The zirconia group adapted best at the distal margin, with a lowest mean gap value of 53.58 \u00b1 15.25 mm (\n                      <jats:italic toggle=\"yes\">P<\/jats:italic>\n                      \u2264 0.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>PEEK copings had better marginal adaptation and fit compared to zirconia copings. It may have applications as a restorative material in fixed prostheses.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.4103\/njcp.njcp_701_22","type":"journal-article","created":{"date-parts":[[2023,7,14]],"date-time":"2023-07-14T06:01:39Z","timestamp":1689314499000},"page":"701-708","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":6,"title":["In Vitro Evaluation of Marginal Adaptation of Polyether Ether Ketone and Zirconia Copings"],"prefix":"10.4103","volume":"26","author":[{"given":"P","family":"Chouksey","sequence":"first","affiliation":[{"name":"Peoples Dental Academy, Bhopal, Madhya Pradesh, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"NS","family":"Yadav","sequence":"additional","affiliation":[{"name":"Department of Prosthodontics Crown and Bridge and Implantology, Peoples Dental Academy, Peoples University, Bhopal, Madhya Pradesh, 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Dentistry, Prince Sattam bin Abdulaziz University, Alkharj- 11942, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ahmed","family":"Alamoudi","sequence":"additional","affiliation":[{"name":"Oral Biology Department, King Abdulaziz University, Jeddah- 22252, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B","family":"Zidane","sequence":"additional","affiliation":[{"name":"Restorative Dentistry Department, King Abdulaziz University, Jeddah- 22252, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N","family":"Albar","sequence":"additional","affiliation":[{"name":"Restorative Dentistry Department, Faculty of Dentistry Jazan University, Jazan- 45412, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"HA","family":"Baeshen","sequence":"additional","affiliation":[{"name":"Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah 21589, Saudi 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