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Improving fatigue damage resistance of alumina through surface grading
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نویسنده
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ren l. ,liu l. ,bhowmick s. ,gerbig y.b. ,janal m.n. ,thompson v.p. ,zhang y.
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منبع
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journal of dental research - 2011 - دوره : 90 - شماره : 8 - صفحه:1026 -1030
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چکیده
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Porcelain-veneered alumina crown restorations often fail from bulk fracture resulting from radial cracks that initiate at the cementation surface with repeated flexure of the stiffer crown layers on the soft dentin support. we hypothesized that bulk fracture may be substantially mitigated by grading the elastic modulus at the crown surfaces. in this study,we fabricated graded structures by infiltrating glass into dense alumina plates,resulting in a diminished modulus at the surface layers. the plates were then bonded to polycarbonate substrates and subjected to fatigue loading in water. tests were terminated when fracture occurred at the cementation tensile surface or at the fatigue endurance limit (1 million cycles). infiltrated specimens showed a significant increase in fatigue fracture loads over non-infiltrated controls. our results indicate that controlled elastic gradients at the surface could be highly beneficial in the design of fracture-resistant alumina crowns. © 2011 international & american associations for dental research.
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کلیدواژه
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alumina crowns; bulk fracture; functionally graded ceramics; modulus gradient; sliding-contact fatigue; surface infiltration by glass
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آدرس
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department of biomaterials and biomimetics,new york university college of dentistry,345 east 24th street,new york,ny 10010, United States, department of biomaterials and biomimetics,new york university college of dentistry,345 east 24th street,new york,ny 10010, United States, department of chemical,materials and biomolecular engineering,center for clean energy engineering,university of connecticut,191 auditorium road,storrs,ct 06269-3222, United States, ceramics division,national institute of standards and technology,stop 8520,100 bureau drive,gaithersburg,md 20899, United States, department of epidemiology and health promotion,new york university college of dentistry,345 east 24th street,new york,ny 10010, United States, department of biomaterials and biomimetics,new york university college of dentistry,345 east 24th street,new york,ny 10010, United States, department of biomaterials and biomimetics,new york university college of dentistry,345 east 24th street,new york,ny 10010, United States
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Authors
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