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

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]

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

• 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