Fatigue resistance of all-ceramic molar crowns manufactured with CAD/CAM technology.
Published: 2006
Language: eng
Number of pages: 120
ISBN-13: 9780494211083
Description: Purpose. To compare fracture strength and mechanical fatigue resistance of CAD/CAM-manufactured new zirconium-oxide (In-Ceram YZ, Vita)(YZ) and feldspathic all-ceramic crowns (Vita Mark II, Vita)(VMII).  Methods. Forty replication dies of a prepared ivorine molar were made using an epoxy resin (Viade). Twenty VMII crowns and 20 YZ crowns were cemented to their respective dies using resin cement. Half of the crowns in each group were subjected to fatigue test in a universal testing machine. All crowns, except those that fractured during fatiguing, were then loaded to fracture. Statistical tests were ANOVA, Chi-Square and Fisher's Exact ( p &lt; 0.05). Results. All VMII crowns exhibited no visible crack formation; 40% of YZ crowns fractured and the remainder developed cracks during the fatigue test. All the YZ crown fractures were located within the veneering layer. Mechanical fatiguing significantly decreased the fracture strength. Conclusions. VMII crowns showed more fatigue resistance than YZ crowns in-vitro and might better resist cracking when used clinically.
Notes: Source: Masters Abstracts International, Volume: 45-03, page: 1444.

Thesis (M.Sc.)--University of Toronto, 2006.

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