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Updated: Oct 22, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Inner marginal strength of CAD/CAM materials is not affected by machining protocol.
Julia Lubauer1, Renan Belli1, Fernanda H Schünemann2
1Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Zahnklinik 1 - Zahnerhaltung und Parodontologie, Forschungslabor für dentale Biomaterialien, Erlangen, Germany.
The rough-fast machining strategy does not impact the marginal strength of CAD/CAM dental materials. Resin composites may offer superior performance over some glass-ceramics, highlighting material choice importance.
Area of Science:
- Dental materials science
- Biomaterials engineering
- CAD/CAM restorative dentistry
Background:
- Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) offers efficient fabrication of dental restorations.
- Assessing the marginal strength of CAD/CAM materials is crucial for clinical longevity.
- Machining strategies may influence the mechanical properties of ceramic and composite materials.
Purpose of the Study:
- To compare the marginal strength of five CAD/CAM materials using two machining strategies (rough-fast vs. fine-slow).
- To evaluate the influence of machining protocols on the hoop strength of dental crowns.
- To correlate hoop strength test results with finite element analysis (FEA) for inner marginal strength.
Main Methods:
- Five CAD/CAM materials (lithium disilicate, lithium (di)silicate, polymer-infiltrated ceramic, two resin composites) were selected.
- Model sphero-cylindrical dental crowns were machined using Cerec MC XL with rough-fast and fine-slow protocols.
- Hoop-strength testing and FEA were employed to determine inner marginal strength, analyzed with Weibull statistics.
Main Results:
- Machining strategy did not significantly affect the marginal strength of any tested CAD/CAM material.
- Ceramic materials exhibited more outer margin chippings, but this did not compromise inner marginal strength.
- IPS e.max® CAD demonstrated the highest marginal strength, while Enamic® and Lava™ Ultimate showed the lowest.
Conclusions:
- The rough-fast machining strategy does not negatively impact the marginal strength of evaluated CAD/CAM materials compared to the fine-slow strategy.
- Certain resin composite materials show potential for superior performance compared to some glass-ceramic materials.
- Material selection is a key factor in achieving optimal marginal strength in CAD/CAM dental restorations.
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