Fatigue of conventional and machinable restorative materials
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Abstract
Fatigue is an important property of dental materials in regard to clinical performance of restorations. Clinically, accumulation of microstructure damage during mastication often induces catastrophic failure.
This in-vitro study determined the influence of static chemical fatigue on the life of 2 all-ceramic materials: glass-infused In-Ceram Alumina and In-Ceram Spinell (Vita), and one new composite material: Paradigm MZ100 (3M). The experiments were conducted in both dry and wet environments.
The aim of this study was also to investigate the effects of cyclic fatigue on the strength of the following CAD-CAM crowns: ProCAD (Ivoclar), Paradigm MZ100 (3M) and Mark II (Vita).
For the static fatigue experiments, disc specimens were prepared for each material: 15mm diameter and l.20mm thickness for In-Ceram Alumina and Spinell; 14mm diameter and l.2mm thickness for Paradigm MZ100. Groups of approximately 10 specimens for each material were used to determine the biaxial flexural strength of the materials. Then, groups of approximately 5 specimens were placed under constant load (usually 100%, 95%, 90% and 85% of the minimal load to fracture) until failure, in both dry and wet environments.
For the cyclic fatigue experiments, standardized crowns were fabricated with a CEREC 2 machine. For each material, a group of 10 crowns was tested for load to fracture, and a second group of crowns was subjected to a regime of l0,000 cycles with a load equal to 40% of the minimal load to fracture, and then loaded to fracture after the cycling.
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Description
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Dental Medicine, 2001 (Restorative Sciences/Biomaterials).
Includes bibliography (leaves 91-94).
Includes bibliography (leaves 91-94).
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This work is being made available in OpenBU by permission of its author, and is available for research purposes only. All rights are reserved to the author.