Use este identificador para citar ou linkar para este item:
http://hdl.handle.net/1843/51264
Tipo: | Artigo de Periódico |
Título: | Biomechanical behavior of endodontically treated premolars using different preparation designs and cad/cam materials |
Autor(es): | Diogo Pedrollo Lise Annelies Van Ende Jan de Munck Thaís Yumi Umeda Suzuki Luiz Clovis Cardoso Vieira Bart Van Meerbeek |
Resumo: | Objectives: 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 option |
Assunto: | Endodontics Bicuspid Tooth crown |
Idioma: | por |
País: | Brasil |
Editor: | Universidade Federal de Minas Gerais |
Sigla da Instituição: | UFMG |
Departamento: | FAO - DEPARTAMENTO DE ODONTOLOGIA RESTAURADORA |
Tipo de Acesso: | Acesso Aberto |
Identificador DOI: | https://doi.org/10.1016/j.jdent.2017.02.007 |
URI: | http://hdl.handle.net/1843/51264 |
Data do documento: | Abr-2017 |
metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S0300571217300362?via%3Dihub |
metadata.dc.relation.ispartof: | Journal of Dentistry |
Aparece nas coleções: | Artigo de Periódico |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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Biomechanical behavior of endodontically treated premolars using different preparation designs and cad cam materials.pdf | 1.43 MB | Adobe PDF | Visualizar/Abrir |
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