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Updated: Jul 30, 2025

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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
432
STRESS DISTRIBUTION OF MONOLITHIC AND VENEERED THREE-UNIT ZIRCONIA FDPS: A FINITE ELEMENT ANALYSIS
The International Journal of Prosthodontics
|May 17, 2023
Summary
Monolithic zirconia and CAD-on zirconia frameworks offer superior fracture resistance in three-unit fixed partial dentures. Restoration design significantly impacts stress distribution, with monolithic designs experiencing higher stresses.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Finite Element Analysis in Dentistry
Background:
- Fixed partial dentures (FPDs) are crucial for restoring missing teeth.
- Zirconia-based materials are increasingly used due to their mechanical properties.
- Understanding the influence of restoration design on FPD longevity is essential.
Purpose of the Study:
- To compare the fracture resistance of different three-unit zirconia fixed partial denture (FPD) designs.
- To analyze stress distribution in veneered versus monolithic zirconia FPDs using finite element analysis (FEA).
Main Methods:
- Four groups of three-unit zirconia FPDs were tested: monolithic zirconia (MZ), conventional layering (ZL), heat-pressed (ZP), and CAD/CAM lithium-disilicate (CAD-on).
- Specimens underwent 500,000 cyclic loading cycles (50-600 N) in a universal testing machine.
- Finite element analysis (FEA) was used to evaluate stress distribution and maximum principal stresses (MPS).
Main Results:
- Monolithic zirconia (MZ) and CAD-on restorations successfully survived the fatigue test.
- Conventional layering (ZL) and heat-pressed (ZP) groups showed failures during cyclic loading.
- Maximum principal stresses were highest in monolithic zirconia FPDs, located under the mesial connector.
Conclusions:
- Monolithic zirconia and CAD-on zirconia frameworks demonstrate superior fracture resistance for three-unit FPDs.
- Restoration design significantly influences stress distribution within zirconia FPDs.
- FEA provides valuable insights into the mechanical behavior of dental restorations.
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