Abstract
Mechanistic polymerization shrinkage and stress behaviors of dental composite resins Filtek P90 (3M ESPE, USA) and Clearfil AP-X (Kuraray, Japan) were investigated using CCD camera and digital image correlation (DIC) method during and after light irradiation. For both resins, the interior of the resin part exhibited greater radial shrinkage strain (εr) due to more mobility than the resin margin near the interface of the substrate ring, where a non-symmetric distribution of εr was observed with a peak away from the center. DIC experiments on the specimen surface showed that the maximum principal stresses obtained along the margin were 1.5–8.4 times larger than the corresponding values by FEM. The non-symmetric shrinkage and the large shrinkage rate during light irradiation caused a significant increase in the principal tensile stress along the interface at cured state.
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Abbreviations
- ε r :
-
Radial shrinkage strain
- Δr :
-
Radius variation
- \({{\bar \varepsilon }_r}\) :
-
Average radial shrinkage strain
- r i :
-
Radial distance from the center
- Δr i :
-
Displacement of the specified location
- ε 1 :
-
The first principal strain
- ε x :
-
Normal strains in the x direction
- ε y :
-
Normal strains in the y direction
- γ xy :
-
Shear strain
- σ 1 :
-
Principal stress
- σ r :
-
Radial normal stress
- \({{\bar \varepsilon }_g}\) :
-
Average normal strain
- E e :
-
Equivalent elastic modulus
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2012R1A2A2A02010147, No. 2019R1A2C1002193).
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Jung-Hoon Park is working at Research Institute of Engineering and Technology, Hanyang University, Gyeonggi-do, Korea. He received his Ph.D. in mechanical engineering from Hanyang University. His research area is composite analysis and nondestructive inspection.
Nak-Sam Choi is Professor of Department of Mechanical Engineering, Hanyang University (ERICA), Korea. He received his B.S. in Mechanical Engineering from Seoul National University, Korea, his M.S. in Mechanical Engineering from KAIST, and Ph.D. in Composite Materials & Applied Mechanics from Kyushu University, Japan. His research interests include composites science, fatigue life and microstrain analysis, and nondestructive examination of advanced materials.
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Park, JH., Choi, NS. Polymerization shrinkage and stress analysis during dental restoration observed by digital image correlation method. J Mech Sci Technol 35, 5435–5444 (2021). https://doi.org/10.1007/s12206-021-1114-y
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DOI: https://doi.org/10.1007/s12206-021-1114-y