Residual stresses in the porcelain veneer layer of all-ceramic restorations Public Deposited

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Last Modified
  • March 21, 2019
Creator
  • Suranyi, Thomas P.
    • Affiliation: School of Dentistry, Department of Prosthodontics
Abstract
  • Objectives: Literature evidence suggests that chipping of the porcelain veneer layer in zirconia based all-ceramic restorations is greater when compared to porcelain fused to metal restorations. The aims of this study were to determine, in vitro, what roles rapid cooling and thermal diffusivity had on chipping and to determine whether failure mechanisms in vitro were comparable to those found in vivo. Methods & Materials: CAD/CAM was used for sample fabrication, with subsequent static and dynamic loading. Specimens were fractographically evaluated. Results: Quantitative analysis revealed higher residual stress in rapidly cooled samples. Fractographic analysis of in vitro samples demonstrated origins of failure and directions of crack propagation stemming from sites adjacent to load application. Conclusion: Samples rapidly cooled were found to have had larger chipping of the veneer layer. The findings of this study demonstrate inconsistent failure mechanisms between laboratory samples and published reports of failure mechanisms found in situ.
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  • In Copyright
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  • "... in partial fulfillment of the requirements for the degree of Master of Oral Biology in the School of Dentistry (Prosthodontics)."
Advisor
  • Felton, David A.
Degree granting institution
  • University of North Carolina at Chapel Hill
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Place of publication
  • Chapel Hill, NC
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  • Open access
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