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Published on: December 20, 2024
Merlon machinability and mechanical properties of four CAD/CAM block materials
Nina Attik1,2, Pierre Colon1,3,4, Brigitte Grosgogeat1,2,5
1Laboratoire des Multimatériaux et Interfaces, UMR CNRS 5615, Univ Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.
This study compared composite and ceramic CAD/CAM materials. Composite blocks showed superior edge quality after machining, suggesting better dental margin adaptation for posterior restorations.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- CAD/CAM Technology
Background:
- CAD/CAM materials are crucial for dental restorations.
- Evaluating mechanical properties and machinability informs clinical use.
- Composite and ceramic blocks offer different performance profiles.
Purpose of the Study:
- To compare mechanical properties and machinability of composite (CS, LU, GR) and ceramic (IR) CAD/CAM blocks.
- To assess suitability for clinical applications based on material behavior.
- To investigate the impact of material type on machined margin integrity.
Main Methods:
- Mechanical testing: flexural strength, modulus, fracture toughness, Vickers hardness (ISO protocols).
- Machinability assessment: Merlon fracture method (ISO 18675:2022).
- Surface analysis: Scanning Electron Microscopy (SEM) of machined margins.
- Statistical analysis: One-way ANOVA (α=0.05).
Main Results:
- Grandio Blocs (GR) had highest flexural strength; Initial LRF (IR) showed highest flexural modulus and Vickers hardness.
- Cerasmart (CS) exhibited lowest fracture toughness.
- SEM revealed superior edge integrity for composite blocks compared to the ceramic block (IR).
- All materials met ISO standards for machinability.
Conclusions:
- Composite-based blocks demonstrate better edge quality, potentially improving adaptation in posterior dental restorations.
- Ceramic materials offer greater hardness, suitable for enamel replacement.
- Material selection should consider specific clinical demands for optimal restoration outcomes.
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