Ceramic attributes like biocompatibility and inertness have secured their utilization in biomedical prosthetics. The brittle character of ceramics governs their application in any design and fabrication approach. Current all-ceramic dental crowns have a recorded failing rate of around 3% annually. A study of a possible superior design over current all-ceramic dental crowns is conducted. Current techniques of fabricating all-ceramic dental crowns require difficult and inefficient use of porcelain veneer layers onto a core material. The suggested design is to join independently fabricated veneer and core layers collectively employing a high elastic modulus composite. Fracture behavior of brittle layers joined by a high elastic modulus composite is researched in this dissertation. You will find 2 prominent fracture mechanisms of interest for dental crowns when joining brittle layers with a more compliant interlayer; the formation of radial cracks in the veneer or core and the prop…
Contents
Chapter 1: Introduction
Chapter 2: Background
2.1 Introduction
2.2 Dental Crowns
2.2.1 Current All-ceramic Crown Fabrication
2.2.2 Freeform Fabrication
2.3 Flat Model Testing
2.3.1 Testing of Brittle Laminates
2.3.2 Current Dental Adhesives as an Interlayer
2.4 High Modulus Composite Joins
2.5 Summary
Chapter 3: Composite Processing and Specimen Preparation
3.1 Introduction
3.2 Materials and Methods: Bulk Composite Fabrication
3.3 Composite Properties
3.3.1 Mixing and Viscosity
3.3.1 Microstructure and Bulk Density
3.4 Join Fabrication For Hertzian Contact Testing
3.5 Aesthetic Properties of Bulk and Joins
3.6 Composite Novelty
3.7 Summary
Chapter 4: Hertzian Loading of Layered Structures and the Effect of Join Elastic Modulus
4.1 Introduction
4.2 Experimental Setup: In Situ Hertzian Contact Testing
4.3 Radial Crack Testing in Single Cycle Loading
4.4 Radial Crack Testing in Multi Cycle Loading
4.5 Summary
Chapter 5: Crack Containment Between Layers Joined with Composite/Epoxy Interlayer
5.1 Introduction
5.2 Experimental Set-up
5.3 Hertzian Contact Radial Crack Growth: Core/Join/Veneer
5.4 Plane Strain Driven Cracks: 4 Point Bend Bar
5.4.1 Bend Bar: Experimental Setup
5.4.2 Bend Bar: Experimental Results
5.5 Two-Dimensional Transverse Cracks: Line Load via Knife Indenter
5.5.1 Knife Indenter: Experimental Setup
5.5.2 Knife-Indenter Experimental Results
5.6 Summary
Chapter 6: Conclusions
Chapter 7: Future Work…
Source: University of Maryland