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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/51264
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dc.creatorDiogo Pedrollo Lisept_BR
dc.creatorAnnelies Van Endept_BR
dc.creatorJan de Munckpt_BR
dc.creatorThaís Yumi Umeda Suzukipt_BR
dc.creatorLuiz Clovis Cardoso Vieirapt_BR
dc.creatorBart Van Meerbeekpt_BR
dc.date.accessioned2023-03-28T00:35:58Z-
dc.date.available2023-03-28T00:35:58Z-
dc.date.issued2017-04-
dc.citation.volume59pt_BR
dc.citation.spage54pt_BR
dc.citation.epage61pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.jdent.2017.02.007pt_BR
dc.identifier.issn03005712pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/51264-
dc.description.resumoObjectives: To evaluate the effect of restoration design (‘2.5-mm deep endocrown’, ‘5-mm deep endocrown’ or ‘5-mm deep post&crown’) and CAD/CAM material type (composite or lithium disilicate glass-ceramic) on the load-to-failure of endodontically treated premolars in absence of any ferrule. Methods: The crowns of 48 single-rooted premolars were cut and the roots were endodontically treated. Teeth were randomly divided into six groups (n = 8); teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2.5-mm or 5-mm deep intra-radicular extension) or conventional crowns (5-mm deep post&crown). After cementation using luting composite, the specimens were immersed in distilled water and subjected to 1,200,000 chewing cycles with a load of 50 N applied parallel to the long axis of the tooth (0 ). After cyclic loading, a compressive load was applied at 45 to the tooth’s long axis using a universal testing machine until failure. Load-to-failure was recorded (N) and the specimens were examined under a stereomicroscope with 3.5x magnification to determine the mode of failure. Results: All specimens survived the 1,200,000 chewing cycles. A significant interaction between restoration design and CAD/CAM material was found using two-way ANOVA. In the ‘2.5-mm deep endocrown’ groups, the composite achieved a significantly higher load-to-failure than the lithium disilicate glass-ceramic, while no differences between materials were found in the ‘5-mm deep endocrown’ and ‘5-mm deep post&crown’ groups. More unfavorable failures (root fractures) were observed for higher load-to-failure values. Conclusions: Only following a ‘2.5-mm deep endocrown’ design, composite appeared more favorable than lithium disilicate glass-ceramic as crown material; this may be explained by their difference in elastic modulus. Clinical significance: Shallow endocrown preparations on premolars present less surface for adhesive luting and a difference in crown material becomes apparent in terms of load-to-failure. The use of a more flexible composite crown material appeared then a better optionpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentFAO - DEPARTAMENTO DE ODONTOLOGIA RESTAURADORApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofJournal of Dentistrypt_BR
dc.rightsAcesso Abertopt_BR
dc.subject.otherEndodonticspt_BR
dc.subject.otherBicuspidpt_BR
dc.subject.otherTooth crownpt_BR
dc.titleBiomechanical behavior of endodontically treated premolars using different preparation designs and cad/cam materialspt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.sciencedirect.com/science/article/pii/S0300571217300362?via%3Dihubpt_BR
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