| Full text | |
| Author(s): |
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]
Total Authors: 8
|
| Affiliation: | [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
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Dental Materials; v. 28, n. 4, p. E27-E34, APR 2012. |
| Web of Science Citations: | 4 |
| Abstract | |
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) | |