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

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• 作者：Lucas V.S. Pabis^a ; Tathy A. Xavier^a ; Ecinele F. Rosa^a ; Flá ; via P. Rodrigues^b ; Josete B.C. Meira^a ; Raul G. Lima^c ; Leonardo E. Rodrigues Filho^a ; Rafael Y. Ballester^a ; ^ryb@usp.br
• 关键词：Resin-composite ; Finite element analysis ; Mechanical stress ; Dental stress analysis ; Dental bonding ; Materials testing biomechanics
• 刊名：Dental Materials
• 出版年：2012
• 期刊代码：29_01095641
• 类别：ms
• 出版时间：April, 2012
• 卷：28
• 期：4
• 页码：e27-e34
• 文件大小：980 K

摘要

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.