Resumo

VALLEJO-LABRADA, Maricela  e  SALAS, Andres. Fracture resistance of weak teeth with compromised roots rehabilitated with different materials. CES odontol. [online]. 2014, vol.27, n.2, pp.69-80. ISSN 0120-971X.

Abstract Introduction and objective: The preservation and restoration of weak teeth with compromised roots has been considered to be a slightly predictable procedure because there are factors that predispose to failure. This condition appears frequently, and an alternative to rehabilitation is to reinforce the radicular surface in order to improve the stability and retention of the retainer. The objective of this study was to evaluate the resistance to fracture of teeth with debilitated roots and reconstructed with glass ionomer combined with different retainers and compared with teeth with weakened roots without reconstruction. Materials and methods: 60 uniradicular premolars with similar characteristics were selected and divided randomly into 6 groups, 30 teeth were internally debilitated to 1mm and later reinforced with glass ionomer. The samples were submitted to a compressive load on an Instrom Universal Testing Machine with 45°angulation. Afterwards, fracture sites in each of the samples were identified using a magnifier 4X converging lens at a distance of 25 cm. Results: Statistically significant differences were observed regarding the root condition (P <0.05), demonstrating that teeth with root reinforcement did not improve significantly their resistance to fracture. Conclusion: The conservation of tooth structure is most important than the type of reinforcement with dental materials. The physical and chemical characteristics of the ionomers allow they can be used in undermined areas without increasing ultimate compressive strength of tooth structure, providing only stability of the retainer

Palavras-chave : Endodontically-treated teeth; Tooth fracture; Non vital teeth; Compressive strength; Materials testing.

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