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Updated: Aug 9, 2026
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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
Rheological characterization of composites using a vertical oscillation rheometer
In Bog Lee1, Byeong Hoon Cho, Ho Hyun Son
1Department of Conservative Dentistry and Dental Research Institute, College of Dentistry, Seoul National University, Jongro-Gu, Seoul, South Korea. inboglee@snu.ac.kr
Summary
Dental composite handling characteristics are significantly influenced by their viscoelastic properties, which vary greatly between brands. A custom rheometer demonstrated these differences, offering a new way to represent composite viscoelasticity.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Rheology
Background:
- Dental composites are widely used restorative materials.
- Understanding their handling characteristics is crucial for clinical success.
- Viscoelastic properties significantly impact material handling and performance.
Purpose of the Study:
- To investigate the viscoelastic properties of dental composites.
- To correlate these properties with handling characteristics.
- To evaluate a novel method for representing viscoelastic behavior.
Main Methods:
- A custom vertical oscillation rheometer (VOR) was utilized for rheological measurements.
- Dynamic oscillatory tests were performed on four composite brands (Z100, Z250, P60, SureFil).
- Storage modulus (E'), loss modulus (E''), and loss tangent (tan delta) were measured across a frequency range.
Main Results:
- Viscoelastic properties (E', E'', tan delta) showed significant differences among composite brands.
- Complex moduli varied considerably, with SureFil exhibiting the highest.
- Frequency domain phasor plots effectively represented the distinct viscoelastic profiles.
Conclusions:
- Dental composite viscoelasticity significantly impacts handling characteristics and differs substantially between brands.
- The VOR is a practical tool for dynamic rheological analysis of dental composites.
- Frequency domain phasor plots offer a valuable visualization of composite viscoelastic behavior.
