Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Understanding Contradictory Data in Contraction Stress Tests

2010; SAGE Publishing; Volume: 90; Issue: 3 Linguagem: Inglês

10.1177/0022034510388039

1544-0591

Josete Barbosa Cruz Meira, Roberto Ruggiero Braga, Rafael Yagüe Ballester, Carina B. Tanaka, Antheunis Versluis,

Additive Manufacturing and 3D Printing Technologies

The literature shows contradictory results regarding the role of composite shrinkage and elastic modulus as determinants of polymerization stress. The present study aimed at a better understanding of the test mechanics that could explain such divergences among studies. The hypothesis was that the effects of composite shrinkage and elastic modulus on stress depend upon the compliance of the testing system. A commonly used test apparatus was simulated by finite element analysis, with different compliance levels defined by the bonding substrate (steel, glass, composite, or acrylic). Composites with moduli between 1 and 12 GPa and shrinkage values between 0.5% and 6% were modeled. Shrinkage was simulated by thermal analogy. The hypothesis was confirmed. When shrinkage and modulus increased simultaneously, stress increased regardless of the substrate. However, if shrinkage and modulus were inversely related, their magnitudes and interaction with rod material determined the stress response.