{"id":1288,"date":"2024-04-05T12:38:13","date_gmt":"2024-04-05T12:38:13","guid":{"rendered":"https:\/\/umfcd.inobox.ro\/?post_type=lucrari_cercetari&p=1288"},"modified":"2024-09-26T13:12:24","modified_gmt":"2024-09-26T13:12:24","slug":"mechanical-behaviour-of-three-unit-zirconia-infrastructures-with-modified-copings","status":"publish","type":"lucrari_cercetari","link":"https:\/\/cicds.umfcd.ro\/en\/lucrari_cercetari\/mechanical-behaviour-of-three-unit-zirconia-infrastructures-with-modified-copings\/","title":{"rendered":"Mechanical behaviour of three-unit zirconia infrastructures with modified copings"},"content":{"rendered":"
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Mechanical behaviour of three-unit zirconia infrastructures with modified copings<\/h1>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\tMihaela Pantea1<\/sup> , Robert Ciocoiu2\u2020<\/sup> , Ana Maria Cristina \u021a\u00e2ncu3*<\/sup> ,Lucian Toma Ciocan4*<\/sup> , Drago\u0219 Epistatu5\u2020<\/sup> , Ruxandra Sfeatcu6\u2020<\/sup> ,Andreea Cristiana Didilescu7\u2020<\/sup> , Silviu Mirel Pi\u021buru8<\/sup> , Marina Imre9<\/sup>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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1,3,9<\/sup> \u201cCarol Davila\u201d University of Medicine and Pharmacy, Bucharest, Romania, Faculty of Dentistry, Department of Prosthodontics
\n2<\/sup> National University of Science and Technology Politehnica Bucharest, Romania, Faculty of Materials Science and Engineering, Department of Metallic Materials Science, Physical Metallurgy 
\n4<\/sup> \u201cCarol Davila\u201d University of Medicine and Pharmacy, Bucharest, Romania, Faculty of Dentistry, Department of Dental Prostheses Technology
\n5<\/sup> \u201cCarol Davila\u201d University of Medicine and Pharmacy, Bucharest, Romania, Faculty of Dentistry, Department of Dental and General Radiology
\n6<\/sup> \u201cCarol Davila\u201d University of Medicine and Pharmacy, Bucharest, Romania, Faculty of Dentistry, Department of Oral Health and Community Dentistry
\n7<\/sup> \u201cCarol Davila\u201d University of Medicine and Pharmacy, Bucharest, Romania, Faculty of Dentistry, Department of Embryology
\n8<\/sup> \u201cCarol Davila\u201d University of Medicine and Pharmacy, Bucharest, Romania, Faculty of Dentistry, Department of Organization, Professional Legislation and Management of the Dental Office
\n\u2020<\/sup> These authors have the same scientific contribution and equal rights as the first author.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Aim of the study The purpose of this in vitro study was to analyse the influence of various types zirconia copings on flexural strength of zirconia frameworks designated for posterior tooth-supported fixed dental prostheses. Materials and methods Zirconia samples (Pre-sintered Zirconia, 3Y-TZP, NOVAZir\u00ae ST, Novadent, Hamburg, Germany) were designed as three-unit bridge infrastructures, replacing the first right lower molar. The samples (n=4) were divided into two testing groups: the first group included two samples with copings having even thickness of 0.6mm (coded P1 and P2), and second group (coded P3 and P4) comprised modified copings with thickness varying from 0.80-0.84mm in specific occlusal-axial areas. The cross sectional area of all connectors was established at 9mm\u00b2 with an elliptical shape. Mechanical tests (three-point flexural tests) were conducted on all samples using a universal testing machine. Results The evaluation of zirconia samples\u2019 mechanical behaviour revealed group-depended differences: zirconia samples with modified copings demonstrated higher flexural strength in the applied mechanical tests (0.894kN for P3 and 1.109kN for P4) compared to zirconia samples with even coping thickness (0.561kN for P1 and 0.772kN for P2). Conclusions Modified zirconia copings have shown potential as an alternative to enhance the flexural strength of zirconia infrastructures, and could provide a more suitable support and an even thickness for veneering ceramic.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\tKey words: zirconia, modified copings, flexural strength, dental prosthesis, CAD-CAM\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tDownload paper\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/span>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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