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Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
Published on: January 25, 2019
Curing efficiency of various resin-based materials polymerized through different ceramic thicknesses and curing time
Jung-Won Lee1, Hyun-Suk Cha, Joo-Hee Lee
1Department of Dentistry, College of Medicine, University of Ulsan, Ulsan, Korea.
The Journal of Advanced Prosthodontics
|November 5, 2011
Summary
Thinner ceramic restorations and longer curing times improve resin hardness. Adding a catalyst significantly increases hardness, with restorative resins like Z350 and Z250 outperforming resin cements.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Ceramic restorations are widely used in dentistry.
- Understanding light penetration through ceramics is crucial for effective resin polymerization.
- Curing efficiency directly impacts the mechanical properties and longevity of resin-based dental materials.
Purpose of the Study:
- To evaluate the curing efficiency of different resin-based materials polymerized through ceramic layers of varying thicknesses.
- To assess the impact of ceramic thickness and light-curing time on the surface microhardness of resin materials.
- To compare the microhardness of restorative resins versus resin cements under different curing conditions.
Main Methods:
- Four resin materials (Z350, Z250, Variolink II with/without catalyst) were tested.
- Resins were cured through ceramic discs (0.5, 1, and 2 mm thick) using LED light.
- Surface microhardness (Vickers hardness number - VHN) was measured on the bottom surfaces of the resin specimens.
Main Results:
- Increased ceramic thickness significantly reduced resin microhardness (VHN).
- Longer curing times (40s vs. 20s) resulted in significantly higher VHN values for all tested resins.
- Resins with a self-curing catalyst (VLC) exhibited higher VHN than those without (VL).
- Restorative resins (Z350, Z250) demonstrated superior microhardness compared to resin cements (VL, VLC).
Conclusions:
- Thinner ceramic restorations and extended light-curing times enhance resin material hardness.
- The inclusion of a self-curing catalyst is beneficial for achieving greater hardness in resin-based materials.
- Restorative composite resins offer better microhardness outcomes than resin cements when polymerized through ceramic restorations.
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