Veneer vs. Core Failure in Adhesively Bonded All-ceramic Crown Layers
| Autor: | E.D. Rekow, S. Bhowmick, Isabel K. Lloyd, Brian R. Lawn, J.-Y. Kwon, James J.-W. Lee |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Polymers Surface Properties medicine.medical_treatment Dental bonding Bite Force Dental Materials Brittleness Materials Testing Aluminum Oxide medicine Humans Cubic zirconia Dental Restoration Failure Ceramic Composite material Pliability General Dentistry Polycarboxylate Cement Crowns Epoxy Resins Dental Bonding Adhesiveness Dental Porcelain Elasticity Resin Cements Core (optical fiber) Dental Veneers Cracking visual_art visual_art.visual_art_medium Veneer Glass Stress Mechanical Zirconium Adhesive Post and Core Technique |
| Zdroj: | Journal of Dental Research. 87:363-366 |
| ISSN: | 1544-0591 0022-0345 |
| Popis: | Joining a brittle veneer to a strong ceramic core with an adhesive offers potential benefits over current fabrication methods for all-ceramic crowns. We tested the hypothesis that such joining can withstand subsurface radial cracking in the veneer, from enhanced flexure in occlusal loading, as well as in the core. Critical conditions to initiate fractures were investigated in model crown-like layer structures consisting of glass veneers epoxy-joined onto alumina or zirconia cores, all bonded to a dentin-like polymer base. The results showed a competition between critical loads for radial crack initiation in the veneers and cores. Core radial cracking was relatively independent of adhesive thickness. Zirconia cores were much less susceptible to fracture than alumina, attributable to a relatively high strength and low modulus. Veneer cracking did depend on adhesive thickness. However, no significant differences in critical loads for veneer cracking were observed for specimens containing alumina or zirconia cores. |
| Databáze: | OpenAIRE |
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