Related Experiment Videos
Near-surface damage--a persistent problem in crowns obtained by computer-aided design and manufacturing
1College of Dentistry, New York University, New York, NY, USA. edr1@nyu.edu
Summary
Computer-aided design and manufacture (CAD/CAM) dental crowns show near-surface damage, reducing strength. Managing fabrication, clinical factors, and biomechanics is crucial for robust, long-lasting ceramic restorations.
Area of Science:
- Biomaterials Science
- Dental Materials
- Mechanical Engineering
Background:
- Advancements in computer-aided design and manufacture (CAD/CAM) and ceramic materials have improved dental crowns.
- All-ceramic crowns are susceptible to near-surface damage, limiting their clinical longevity, particularly in posterior applications.
Purpose of the Study:
- To analyze factors contributing to near-surface damage in CAD/CAM fabricated dental crowns.
- To identify mechanisms that initiate and exacerbate damage, leading to potential catastrophic failure.
Main Methods:
- Review of material selection, machining parameters, and strategies in CAD/CAM fabrication.
- Analysis of post-fabrication manipulations, occlusal fatigue, and biomechanical stress fields.
- Examination of damage initiation sites and failure mechanisms in ceramic dental restorations.
Main Results:
- CAD/CAM fabrication parameters significantly influence the degree of near-surface damage.
- Post-fabrication handling, occlusal loading, and tooth-adhesive interface mechanics exacerbate subcritical damage.
- Damage accumulation reduces crown strength, increasing failure probability.
Conclusions:
- Understanding and managing diverse damage modes is essential for improving CAD/CAM dental crown reliability.
- Addressing fabrication, clinical, and biological factors is critical for enhancing the performance and lifespan of ceramic restorations.