Effect of anti-rotation devices on biomechanical behaviour of teeth restored with cast post-and-cores.
Int Endod J
; 43(8): 681-91, 2010 Aug.
Article
en En
| MEDLINE
| ID: mdl-20546042
ABSTRACT
AIM:
To test the hypothesis that the presence of an anti-rotation device (ARD) and its location can influence the biomechanical behaviour of root filled teeth restored with cast post-and-cores and metallic crowns.METHODOLOGY:
Fifth two bovine incisor roots were selected and divided into four groups (n = 13) Nd- without ARD; Bd- buccal ARD; Ld- lingual ARD; BLd- buccal and lingual ARD. The specimens were restored with cast post-and-cores and metallic crowns. After a fatigue process (3 x 10(5) 50 N), three strain gauges were attached on the buccal, lingual and proximal surfaces and the samples of each group (n = 3) were submitted to a 0-100 N load. Fracture resistance was assessed in a mechanical testing machine (n = 10). Strain values and fracture resistance data were analysed by one-way anova and Tukey Honestly Significant Difference (HSD) test (alpha = 0.05). The failure mode was then evaluated under an optical stereomicroscope. Bidimensional models of each group were generated for finite element analysis (FEA) and analysed using the von Mises criteria.RESULTS:
No significant difference in fracture resistance values and fracture modes occurred between the four groups. The BLd group had higher stress concentrations in the buccal dentine and higher strain values on the proximal surfaces.CONCLUSIONS:
The anti-rotation devices did not influence significantly the fracture resistance and fracture mode. However, the stress-strain values were increased when the anti-rotation device was prepared on the buccal and lingual faces concomitantly.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Técnica de Perno Muñón
/
Diente no Vital
/
Análisis del Estrés Dental
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Revista:
Int Endod J
Año:
2010
Tipo del documento:
Article
País de afiliación:
Brasil