Resumo

BUTZKE COELHO, Luiz Felipe; HERBSTRITH SEGUNDO, Regenio Mahfuz; GONCALVES MOTA, Eduardo  e  GROSSI, Marcio. Cavity configuration: Photoelastic analisis of concentration and distribution of stress. Acta odontol. venez [online]. 2007, vol.45, n.4, pp.524-527. ISSN 0001-6365.

The aim of this study was evaluate the behavior of upper first premolars with different cavity configurations using a qualitative analysis of distribution and stress concentration through polarized light in photoelastic models. Photoelastic models were created with different cavity preparations and these samples were submitted to oclusal stress using an universal testing machine associated to circular polariscope that analyzed the stress distribution. The results showed that stress is concentrated in enamel of palatal cuspid in sound teeth. Differently, in the prepared models, stress concentration occurred in different areas of the photoelasticity model. The cavity configuration has a direct influence on the stress distribution. As much tooth structure is removed, worst is the mechanical behavior of the reminiscent.

Palavras-chave : facture strength; photoelasticity analysis.