{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,20]],"date-time":"2026-09-20T16:00:39Z","timestamp":1789920039737,"version":"4.0.1"},"reference-count":21,"publisher":"Maad Rayan Publishing Company","issue":"2","content-domain":{"domain":["joddd.tbzmed.ac.ir"],"crossmark-restriction":false},"short-container-title":["J Dent Res Dent Clin Dent Prospects"],"published-print":{"date-parts":[[2026,6,30]]},"abstract":"<jats:p>Introduction: Multilayer zirconia crowns have gained popularity in oral rehabilitation due to their combination of gradient aesthetics and mechanical strength. However, gaps exist in the literature regarding differences in fracture load among commercial brands, a critical variable for their selection in patients with parafunctional habits. Previous studies have evaluated monolithic zirconia, but few have examined multilayer zirconia under standardized conditions. The present in vitro study compared the fracture load of monolithic crowns fabricated from multilayer zirconia discs of three commercial brands: BeautyZir, Upcera, and Yucera. Methods: A comparative experimental study was conducted using 30 monolithic crowns made from multilayer zirconia discs, distributed as follows: 10 crowns from ST + Multilayer\u00ae BeautyZir, 10 from 4D Pro\u00ae Yucera, and 10 from Explore\u00ae Upcera. Abutments were fabricated with a chamfer finish preparation on an ivorine tooth (#16) and scanned with the TRIOS 3 intraoral system (3Shape\u00ae). The resulting STL file was laser-sintered in cobalt\u2012chromium to obtain the abutment for crown placement. Crown design was performed in Exocad\u00ae software with a central fossa depth of 2.1 mm. The crowns were milled according to each brand\u2019s specifications and subjected to fracture load testing on a universal Instron\u00ae machine, applying axial force using a 12-mm-diameter metallic sphere at a crosshead speed of 3 mm\/s. Data were collected using Excel and analyzed using one-way ANOVA and post hoc Tukey tests (\u03b1=0.05), following verification of normality with the Kolmogorov-Smirnov and Shapiro-Wilk tests. Results: Mean fracture loads (\u00b1SD) were: ST + Multilayer\u00ae: 1807 N (\u00b1463), Explore\u00ae: 1682 N (\u00b1368), Yucera\u00ae: 1173 N (\u00b1183). ANOVA revealed significant differences between groups (P=0.001). The Tukey test showed significant differences between Yucera and Upcera (P=0.010) and Yucera and BeautyZir (P=0.001), with Upcera and BeautyZir demonstrating significantly higher fracture loads than Yucera; however, no differences were observed between Upcera and BeautyZir (P=0.719). All the tested brands exceeded physiological masticatory forces (133\u2013727 N), but Yucera had the lowest safety margin. The high standard deviation in BeautyZir (\u00b1463 N) suggests variability in manufacturing quality. Conclusion: The three multilayer zirconia brands tested withstood normal occlusal forces, but Upcera and BeautyZir were better suited for patients at risk of higher loads. The lack of difference between Upcera and BeautyZir supports their interchangeable clinical use. The lower resistance of Yucera and high dispersion in BeautyZir emphasize the need for stringent quality control during manufacturing. Future studies should incorporate thermocycling, cementation, and in vivo follow-up to validate these findings under clinical conditions.<\/jats:p>","DOI":"10.34172\/joddd.44548","type":"journal-article","created":{"date-parts":[[2026,9,20]],"date-time":"2026-09-20T15:06:53Z","timestamp":1789916813000},"page":"104-111","update-policy":"https:\/\/doi.org\/10.34172\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fracture Load in Monolithic Multilayer Zirconia Crowns From Three Manufacturers: an in Vitro Study"],"prefix":"10.34172","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9090-2240","authenticated-orcid":true,"given":"Neil Duvan","family":"Gutierrez Echavarria","sequence":"first","affiliation":[{"name":"Department of Oral Rehabilitation, School of Dentistry, Instituci\u00f3n Universitaria Colegios de Colombia, UNICOC, Bogot\u00e1, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-0377-9854","authenticated-orcid":true,"given":"Juan Jose","family":"Perico Gomez","sequence":"additional","affiliation":[{"name":"Department of Oral Rehabilitation, School of Dentistry, Instituci\u00f3n Universitaria Colegios de Colombia, UNICOC, Bogot\u00e1, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-8818-2387","authenticated-orcid":true,"given":"Camilo Andres","family":"Galvez Reyes","sequence":"additional","affiliation":[{"name":"Department of Oral Rehabilitation, School of Dentistry, Instituci\u00f3n Universitaria Colegios de Colombia, UNICOC, Bogot\u00e1, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-7993-2219","authenticated-orcid":true,"given":"Alejandra Marleth","family":"Ordo\u00f1ez Molina","sequence":"additional","affiliation":[{"name":"Department of Research, Instituci\u00f3n Universitaria Colegios de Colombia, UNICOC, Bogot\u00e1, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7243-3401","authenticated-orcid":true,"given":"Julian Andres","family":"Tamayo Cardona","sequence":"additional","affiliation":[{"name":"Department of Research, Instituci\u00f3n Universitaria Colegios de Colombia, UNICOC, Bogot\u00e1, Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"20123","published-online":{"date-parts":[[2026,6,30]]},"reference":[{"key":"R1","doi-asserted-by":"publisher","DOI":"10.3390\/dj11010018"},{"key":"R2","doi-asserted-by":"publisher","DOI":"10.4012\/dmj.2015-028"},{"key":"R3","doi-asserted-by":"publisher","DOI":"10.3390\/jfb15080228"},{"key":"R4","doi-asserted-by":"publisher","DOI":"10.2186\/jpr.JPR_D_20_00218"},{"key":"R5"},{"key":"R6","unstructured":"Bustamante Fern\u00e1ndez D. Efectos de Los Protocolos de Sinterizaci\u00f3n Y Simulaci\u00f3n de Ajuste Oclusal en Las Propiedades Mec\u00e1nicas y Confiabilidad de la Zirconia Multicapa Con Gradiente de Resistencia. San Jos\u00e9: Universidad de Costa Rica; 2022. Available from: https:\/\/hdl.handle.net\/10669\/85816. Accessed August 17, 2024."},{"key":"R7"},{"key":"R8","doi-asserted-by":"publisher","DOI":"10.1177\/0022034511434356"},{"key":"R9","doi-asserted-by":"publisher","DOI":"10.1111\/jopr.13242"},{"key":"R10","doi-asserted-by":"publisher","DOI":"10.1155\/2015\/418641"},{"key":"R11","unstructured":"Ministerio de Salud y Protecci\u00f3n Social de Colombia. ENSAB IV. 2014. Available from: https:\/\/www.minsalud.gov.co\/sites\/rid\/Lists\/BibliotecaDigital\/RIDE\/VS\/PP\/ENSAB-IV-Situacion-Bucal-Actual.pdf. 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