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- Title
Does Layering Minimize Shrinkage Stresses in Composite Restorations?
- Authors
Kuijs, R. H.; Fennis, W. M. M.; Kreulen, C. M.; Barink, M.; Verdonschot, N.
- Abstract
Polymerization shrinkage of resin composites may impair restoration longevity. It is hypothesized that layering, rather than bulk, techniques result in less stress in the tooth-restoration complex. The aim of this study was to compare shrinkage stresses for different restorative techniques used for cusp-replacing restorations with direct resin composite. In a 3-D FE model, the dynamic process of shrinkage during polymerization was simulated. Time-dependent parameters (shrinkage, apparent viscosity, Young's modulus, Poisson ratio, and resulting creep), which change during the polymerization process, were implemented. Six different restorative procedures were simulated: a chemically cured bulk technique, a light-cured bulk technique, and 4 light-cured layering techniques. When polymerization shrinkage is considered, a chemically cured composite shows the least resulting stress. The differences seen among various layering build-up techniques were smaller than expected. The results indicate that the stress-bearing locations are the interface and the cervical part of the remaining cusp.
- Subjects
OPERATIVE dentistry; DENTAL resins; POLYMERIZATION; ELASTICITY; POISSON'S ratio; CUSPIDS
- Publication
Journal of Dental Research, 2003, Vol 82, Issue 12, p967
- ISSN
0022-0345
- Publication type
Article
- DOI
10.1177/154405910308201206