{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T05:16:32Z","timestamp":1776057392628,"version":"3.50.1"},"reference-count":33,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2022,9,13]],"date-time":"2022-09-13T00:00:00Z","timestamp":1663027200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical &amp; Exp Dental Res"],"published-print":{"date-parts":[[2022,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objectives<\/jats:title><jats:p>Mechanical properties are cardinal for the long\u2010term clinical success of laminate veneer restorations but the selection of new restorative materials should ideally be based on clinical evidence, therefore, in vitro testing of dental materials is a good alternative to evaluate their properties and understand their behavior so this study aimed to compare and evaluate the effect of two different thicknesses and yttria percentage on the fracture resistance of laminate veneer zirconia restorations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Forty\u00a0laminate veneer restoration prepared from partial sintering zirconia of 3Y (yttria), 5Y (yttria), combined 3Y&amp;5Y (yttria), and lithium disilicate. Specimens were assigned into four main groups according to their percentage of yttria content (<jats:italic>n<\/jats:italic>\u2009=\u200910) and subgrouped into two thicknesses (0.5\u2009mm thickness and 0.3\u2009mm thickness) (<jats:italic>n<\/jats:italic>\u2009=\u20095) as follows: Group I, II, III,\u00a0and IV (Group I for lithium disilicate (control), Group II for 3Y zirconia, Group III for 5Y zirconia, and Group IV for combined 3Y&amp;5Y zirconia), each of them subdivided according to their thickness into two subgroups (<jats:italic>n<\/jats:italic>\u2009=\u20095 for each one) and resistance to fracture for each restoration was evaluated using a universal testing machine. Data were analyzed using a\u00a0one\u2010way\u00a0analysis of variance\u00a0and Duncan's tests at a 5% level of significance.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The thickness of laminate veneer restoration significantly affects the fracture resistance value of all type of laminate veneers restorations (fracture resistance mean value was highest for 0.5\u2009mm thickness and lower for 0.3\u2009mm thickness restorations) and yttria percentage significantly affect fracture resistance value of zirconia laminate veneer restorations (fracture resistance mean value was highest for 0.5\u2009mm thickness of 3Y zirconia [865\u2009N] and combined 3Y&amp;5Y zirconia [846\u2009N]).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Reducing the thickness of laminate zirconia veneer restorations to 0.3\u2009mm reduces its fracture resistance and increasing yttria percentage had an adverse effect on fracture resistance of zirconia laminate veneer restorations.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cre2.658","type":"journal-article","created":{"date-parts":[[2022,9,13]],"date-time":"2022-09-13T17:59:20Z","timestamp":1663091960000},"page":"1413-1420","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Thickness and yttria percentage influences\u00a0the fracture resistance of laminate veneer zirconia restorations"],"prefix":"10.1002","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6386-279X","authenticated-orcid":false,"given":"Ali Dhahee","family":"Malallah","sequence":"first","affiliation":[{"name":"Department of Conservative Dentistry, College of Dentistry University of Mosul Mosul Iraq"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nadia H.","family":"Hasan","sequence":"additional","affiliation":[{"name":"Department of Conservative Dentistry, College of Dentistry University of Mosul Mosul Iraq"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,9,13]]},"reference":[{"issue":"20","key":"e_1_2_10_2_1","first-page":"81","article-title":"Fracture resistance and marginal adaptation of CAD\/CAM generated monolithic zirconia laminate veneers: In\u2010vitro study","volume":"6","author":"Abdel\u2010Nabi W. 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