Finite Element Study on: Zirconia Overlay Restorations Made with Different Tooth Preparation Designs

Finite Element Study on: Zirconia Overlay Restorations Made with Different Tooth Preparation Designs | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Finite Element Study on: Zirconia Overlay Restorations Made with Different Tooth Preparation Designs Yousra A. Awad, Ahmed Attia, Lamia E. Dawood, Mohamed I. El-Anwar This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6234423/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Background : This study aimed to compare and evaluate the effect of different tooth overlay preparation designs on deformation and stress distribution under average masticatory load. Methods : Four three-dimensional (3D) finite element models were specially created to simulate the clinical cases of using four different overlay restoration designs as: Model 1 (ACC) anatomical cusp reduction with chamfer finishing line. Model 2 (FCC) flat cusp with chamfer finishing line. Model 3 (ACS) anatomical cusp reduction with proximal steps. Model 4 (FCS) flat cusp reduction with proximal steps were tested. All models were restored with translucent CAD/CAM zirconia crowns. Geometries were obtained via laser scanning, then manipulated by Boolean operation to finalize the models. All models were subjected to vertical loading of 600N compressive load located at central fossa. Results : variation in deformation results did not exceed six microns between anatomic and flat cusp reduction with chamfer finish line, and also between anatomic and flat cusp reduction with proximal steps. Mucosa and spongy bone "based on stress values" were not sensitive to crown type or its preparation. On the other hand, FCC showed better behavior in comparison to ACC. Conclusions : Flat cusp designs showed better behavior by showing slight less stresses on crown body, cement layer and cortical bone. In addition, ACS, FCS designs exerts less stresses on remaining tooth. Therefore, in case of availability of the four preparations, the ACS, FCS design will be preferred, and flat cusp preparation might showed slightly better behavior. Finite element analysis Overlay Zirconia Cuspal reduction Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6234423","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":475162593,"identity":"48d8c171-f87f-485a-9feb-d1fceb5c58c6","order_by":0,"name":"Yousra A. 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All models were restored with translucent CAD/CAM zirconia crowns. Geometries were obtained via laser scanning, then manipulated by Boolean operation to finalize the models. All models were subjected to vertical loading of 600N compressive load located at central fossa.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eResults\u003c/strong\u003e\u003cem\u003e\u003cstrong\u003e:\u003c/strong\u003e\u003c/em\u003evariation in deformation results did not exceed six microns between anatomic and flat cusp reduction with chamfer finish line, and also between anatomic and flat cusp reduction with proximal steps.\u003c/p\u003e\n\u003cp\u003eMucosa and spongy bone \"based on stress values\" were not sensitive to crown type or its preparation. On the other hand, FCC showed better behavior in comparison to ACC.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eConclusions\u003c/strong\u003e: Flat cusp designs showed better behavior by showing slight less stresses on crown body, cement layer and cortical bone. In addition, ACS, FCS designs exerts less stresses on remaining tooth. Therefore, in case of availability of the four preparations, the ACS, FCS design will be preferred, and flat cusp preparation might showed slightly better behavior.\u003c/p\u003e","manuscriptTitle":"Finite Element Study on: Zirconia Overlay Restorations Made with Different Tooth Preparation Designs","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-06-25 11:06:30","doi":"10.21203/rs.3.rs-6234423/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"0e26c0ad-d13d-43ab-a070-2b998ba3879f","owner":[],"postedDate":"June 25th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2025-09-10T10:38:25+00:00","versionOfRecord":[],"versionCreatedAt":"2025-06-25 11:06:30","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-6234423","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-6234423","identity":"rs-6234423","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}