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Updated: Oct 3, 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
485
[Marginal features of CAD/CAM laminate veneers with different materials and thicknesses]
1Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, China.
Summary
Chairside CAD/CAM laminate veneers made of glass-matrix ceramics show higher marginal roughness than resin-matrix ceramics, regardless of thickness. Marginal fit was comparable between materials, with thicker glass-matrix veneers improving roughness.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Chairside computer-aided design and computer-aided manufacturing (CAD/CAM) offers efficient fabrication of dental restorations.
- Laminate veneers are a common aesthetic treatment, with material choice impacting clinical outcomes.
- Understanding marginal integrity is crucial for veneer longevity and success.
Purpose of the Study:
- To compare the marginal roughness and marginal fit of chairside CAD/CAM laminate veneers.
- To evaluate the influence of different materials (glass-matrix vs. resin-matrix ceramics) and thicknesses (0.3 mm vs. 0.5 mm) on veneer properties.
- To provide clinical guidance for selecting appropriate laminate veneer materials and designs.
Main Methods:
- Thirty-six laminate veneers (9 per group) were fabricated using chairside CAD/CAM technology on resin typodonts.
- Veneers were categorized by material (glass-matrix or resin-matrix ceramic) and thickness (0.3 mm or 0.5 mm).
- Marginal roughness was assessed using stereomicroscopy and ImageJ software; marginal fit was measured via fit checker and digital scanning. Mechanical properties of material bars were tested using a universal testing device.
Main Results:
- Glass-matrix ceramic veneers exhibited significantly higher marginal roughness (24.48±5.55 μm for 0.3 mm, 19.06±5.75 μm for 0.5 mm) compared to resin-matrix ceramic veneers (6.13±1.27 μm for 0.3 mm, 6.84±2.19 μm for 0.5 mm).
- Increasing thickness reduced marginal roughness in glass-matrix ceramics but not in resin-matrix ceramics.
- No statistically significant differences in marginal fit were observed among the four groups.
- Glass-matrix ceramics demonstrated superior flexural strength and modulus compared to resin-matrix ceramics, with comparable modulus of resilience.
Conclusions:
- Chairside CAD/CAM glass-matrix ceramic laminate veneers present higher marginal roughness than resin-matrix ceramic counterparts.
- Marginal fit is not significantly affected by material type or thickness within this study.
- Thicker glass-matrix ceramic veneers can decrease marginal roughness, suggesting a potential for improved clinical adaptation.
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