Abstract—The aim of this study was to evaluate the influence
of thermocycling on the mechanical properties of a commercial
dental nanocomposite by using the nano-indentation
experiment. The resin-based nanocomposite contained silica
and zirconia nanofillers. Some disk specimens, each with the
diameter of 10 mm and the thickness of 4 mm were prepared
and the specimens were stored at various environmental
conditions. Some of the samples were kept in the ambient
condition, other samples were stored in distilled water at room
temperature and other ones were thermocycled in distilled
water for 1000 cycles between 5°C and 55°C. After preparation
of samples, the nano-indentation test was applied on the
prepared specimens by Triboscope setup. Then the modulus of
elasticity and hardness of the test samples were calculated from
the Oliver-Pharr’s method using the data obtained from
nano-indentation test. The present research showed that the
samples stored in distilled water without thermocycling
exhibited the highest elasticity modulus when compared to the
other samples. In addition, the maximum hardness was
observed for thermocycled specimens in distilled water.
Index Terms—Dental nanocomposite, thermocycling effect,
nano-indentation test, hardness, elasticity modulus.
The authors are with the Department of Mechanical Engineering, Iran
University of Science and Technology, Tehran, Iran (e-mail:
A_karimzade@mecheng.iust.ac.ir, m.ayat@iust.ac.ir,
Hadi_shirazi@mecheng.iust.ac.ir).
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Cite:A. Karimzadeh, M. R. Ayatollahi, H. Asgharzadeh Shirazi, "Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement," International Journal of Materials, Mechanics and Manufacturing vol. 2, no. 1, pp. 67-72, 2014.
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