Influence of remaining coronal structure and finish line on the fracture strength of roots restored with metallic posts
Braz. oral res
; 25(4): 345-350, July-Aug. 2011. ilus, tab
Artigo
em Inglês
| LILACS
| ID: lil-595855
Biblioteca responsável:
BR1.1
ABSTRACT
The purpose of this study was to evaluate the fracture strength of roots that were prosthetically restored with metallic posts with or without any remaining coronal structure and with different finish lines. Sixty bovine incisors were sectioned below the cementoenamel junction, endodontically treated, and randomly divided into six experimental groups (n = 10) containing teeth with or without any remaining coronal structure, and with a beveled shoulder, a bevel, or a shoulder finish line design. The metallic posts were luted with dual-cured resin cement. The cores were made with composite resin, and metal crowns were cemented with zinc phosphate cement. The specimens were subjected to a tangential compressive load (135º angle) at a crosshead speed of 0.5 mm/min until failure, using a universal testing machine. The fracture strength data were analyzed using the ANOVA and LSMeans (least square means) tests (α= 0.05). The data indicated that the teeth with 2 mm of remaining coronal structure showed the highest fracture strength values when compared with the teeth without any remaining structure (p < 0.05). As to the different finish line designs, the highest fracture strength values were obtained for the beveled shoulder, followed by the bevel and then by the shoulder designs (p < 0.05). It may be concluded that, to increase fracture strength, a beveled shoulder and 2 mm of remaining coronal structure are the ideal conditions.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Fraturas dos Dentes
/
Raiz Dentária
/
Técnica para Retentor Intrarradicular
/
Falha de Restauração Dentária
Tipo de estudo:
Estudo de avaliação
Limite:
Animais
Idioma:
Inglês
Revista:
Braz. oral res
Assunto da revista:
Odontologia
Ano de publicação:
2011
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Federal University of Rio de Janeiro/BR
/
State University of Campinas/BR
/
University of Passo Fundo/BR