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In vitro lifetime of dental ceramics under cyclic loading in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
10950 710 2007 11 PDF Available
Title
In vitro lifetime of dental ceramics under cyclic loading in water
Abstract

All-ceramic dental restorations exhibit enhanced esthetics and biocompatibility as compared to traditional metal-based prosthesis. However, long-term fatigue and subcritical crack growth in the presence of water and cyclic loading can decrease the strength of ceramic components over time. We investigated the cyclic fatigue in water of three dental materials currently used as frameworks in all-ceramic restorations: a 3 mol%-yttria partially stabilized zirconia (3Y-TZP, Cercon, Degudent GmbH), a Al2O3–ZrO2–Glass composite (Inceram-Zirconia, Vita Zahnfabrik GmbH) and a Li2O·2SiO2 glass ceramic (Empress 2, Ivoclar Vivadent AG). Fatigue and fast fracture tests were performed to determine the Weibull distribution of lifetime and initial mechanical strength for each framework component. In spite of its noticeable susceptibility to fatigue in water, the 3Y-TZP material was found to be particularly suitable for the preparation of posterior all-ceramic bridges due to its high initial mechanical strength. Guidelines are provided for the selection of materials and the design of all-ceramic posterior bridges exhibiting lifetime longer than 20 years under severe wet and cyclic loading conditions.

Keywords
Dental restorative material; Fatigue; Mechanical properties; Ceramic structure; Zirconia
First Page Preview
In vitro lifetime of dental ceramics under cyclic loading in water
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 28, Issue 17, June 2007, Pages 2695–2705
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering