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Edge strength of CAD/CAM materials
Maria Pfeilschifter1, Verena Preis1, Michael Behr1
1Department of Prosthetic Dentistry, UKR University Hospital Regensburg, 93042 Regensburg, Germany.
Journal of Dentistry
|May 20, 2018
Summary
The edge force of CAD/CAM materials is significantly influenced by the material type and thickness. Thicker CAD/CAM materials (2mm) showed no significant differences in edge force between materials, unlike 1mm plates.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Materials
Background:
- Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) materials are widely used in restorative dentistry.
- Understanding the mechanical properties, such as edge force, is crucial for material selection and clinical performance.
- Edge force, representing the load to failure or crack initiation, is a critical parameter for milled dental restorations.
Purpose of the Study:
- To investigate the edge force of various CAD/CAM materials.
- To evaluate the influence of material type, thickness, and distance from the margin on edge force.
- To determine the failure patterns of CAD/CAM materials under mechanical stress.
Main Methods:
- Eight resin composites, one resin-infiltrated ceramic, and a lithium-disilicate ceramic were tested.
- Edge force was measured using a Vickers diamond indenter on 1-mm and 2-mm thick plates.
- Measurements were taken at varying distances from the edge (0.4-1.0 mm), with edge force defined at 0.5 mm.
Main Results:
- For 1-mm plates, edge force varied significantly between materials, ranging from 64.4 ± 24.2 N to 183.2 ± 63.3 N.
- For 2-mm plates, edge force values ranged from 129.2 ± 32.5 N to 230.3 ± 67.5 N, with no significant differences between materials.
- Several materials showed significant differences in edge force between 1-mm and 2-mm thicknesses, and failure patterns included cracking, chipping, and fracture.
Conclusions:
- Material type, thickness, and proximity to the edge critically affect the edge force of CAD/CAM materials.
- Clinical selection of CAD/CAM materials should consider their specific edge force characteristics and milling behavior.
- Further research may explore the correlation between edge force and long-term clinical outcomes of dental restorations.
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