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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A method to investigate the shrinkage stress developed by resin-composites bonded to a single flat surface

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Autor(es):
Pabis, Lucas V. S. [1] ; Xavier, Tathy A. [1] ; Rosa, Ecinele F. [1] ; Rodrigues, Flavia P. [2] ; Meira, Josete B. C. [1] ; Lima, Raul G. [3] ; Rodrigues Filho, Leonardo E. [1] ; Ballester, Rafael Y. [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Sch Dent, Dent Mat Dept, BR-05508000 Sao Paulo - Brazil
[2] Anhanguera Bandeirante Univ Sao Paulo UNIBAN, Sch Dent, Biomat Res Grp, Sao Paulo - Brazil
[3] Univ Sao Paulo, Polytech Sch, Dept Mech Engn, BR-05508000 Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Dental Materials; v. 28, n. 4, p. E27-E34, APR 2012.
Citações Web of Science: 4
Resumo

Objectives. To purpose a method for predicting the shrinkage stress development in the adhesive layer of resin-composite cylinders that shrink bonded to a single flat surface, by measuring the deflection of a glass coverslip caused by the shrinkage of the bonded cylinders. The correlation between the volume of the bonded resin-composite and the stress-peak was also investigated. Methods. A glass coverslip deflection caused by the shrinkage of a bonded resin-composite cylinder (diameter: d = 8 mm, 4 mm, or 2 mm, height: h = 4 mm, 2 mm, 1 mm, or 0.5 mm) was measured, and the same set-up was simulated by finite element analysis (3D-FEA). Stresses generated in the adhesive layer were plotted versus two geometric variables of the resin-composite cylinder (C-Factor and volume) to verify the existence of correlations between them and stresses. Results. The FEA models were validated. A significant correlation (p < 0.01, Pearson's test) between the stress-peak and the coverslip deflection when the resin-composites were grouped by diameter was found for diameters of 2 and 4 mm. The stress-peak of the whole set of data showed a logarithmic correlation with the bonded resin-composite volume (p < 0.001, Pearson's test), but did not correlate with the C-Factor. Significance. The described method should be considered for standardizing the stress generated by the shrinkage of resin-composite blocks bonded to a single flat surface. (C) 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 07/00191-0 - Efeito torque em pinos intra-radiculares com achatamento mésio-distal
Beneficiário:Carina Baptiston Tanaka
Modalidade de apoio: Bolsas no Brasil - Iniciação Científica