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Physical property evaluation of four composite materials
Aelite LS shows superior hardness and flexural strength, while Filtek LS exhibits minimal polymerization shrinkage among tested composite resins. Both Knoop and Vickers hardness tests showed strong correlation.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Composite resins are widely used in dental restorations.
- Understanding their physical properties is crucial for clinical success.
- Evaluating current formulations ensures optimal material selection.
Purpose of the Study:
- To assess polymerization shrinkage, surface hardness, and flexural strength of four composite resin formulations.
- To compare Knoop and Vickers hardness testing methods for precision correlation.
Main Methods:
- Four composite resins (Filtek LS, Aelite LS, Kalore, Empress Direct) were tested.
- Polymerization shrinkage measured using a Kaman linometer.
- Surface microhardness evaluated with Knoop and Vickers tests.
- Flexural strength determined via three-point bending test.
Main Results:
- Filtek LS demonstrated significantly lower polymerization shrinkage (0.45%).
- Aelite LS exhibited superior Knoop (114.55 KHN) and Vickers (126.88 VH) surface hardness.
- Aelite LS and Filtek LS showed higher flexural strength (135.75 MPa and 129.42 MPa, respectively).
- Knoop and Vickers hardness tests showed a strong correlation (r=0.99).
Conclusions:
- Aelite LS offers superior hardness and flexural strength.
- Filtek LS presents significantly reduced polymerization shrinkage.
- Both Knoop and Vickers hardness tests are reliable for evaluating composite resins.
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