Micro-CT Evaluation of the Marginal Fit of CAD/CAM all Ceramic Crowns Public Deposited

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  • March 19, 2019
Creator
  • Brenes, Christian
    • Affiliation: School of Dentistry, Department of Prosthodontics
Abstract
  • Objectives: Evaluate the marginal fit of CAD/CAM all ceramic crowns made from lithium disilicate and zirconia using two different fabrication protocols (model and model-less). METHODS: Forty anterior all ceramic restorations (20 lithium disilicate, 20 zirconia) were fabricated using a CEREC Bluecam scanner. Two different fabrication methods were used: a full digital approach and a printed model. Completed crowns were cemented and marginal gap was evaluated using Micro-CT. Each specimen was analyzed in sagittal and trans-axial orientations, allowing a 360o evaluation of the vertical and horizontal fit. RESULTS: Vertical measurements in the lingual, distal and mesial views had and estimated marginal gap from 101.9 to 133.9 microns for E-max crowns and 126.4 to 165.4 microns for zirconia. No significant differences were found between model and model-less techniques. CONCLUSION: Lithium disilicate restorations exhibited a more accurate and consistent marginal adaptation when compared to zirconia crowns. No statistically significant differences were observed when comparing model or model-less approaches.
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  • In Copyright
Advisor
  • Ritter, Andre
  • Duqum, Ibrahim
  • Cooper, Lyndon F.
  • Mendonca, Gustavo
Degree
  • Master of Science
Degree granting institution
  • University of North Carolina at Chapel Hill Graduate School
Graduation year
  • 2014
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Place of publication
  • Chapel Hill, NC
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