Evaluation of Thermal Conductivity and Some Other Properties of Heat Cured Denture Soft Liner Reinforced By Halloysite Nanotubes
Wedyan Yaseen Hasan1 and Mohammed Moudhaffar Ali2  

1Department of Prosthetic Dentistry, College of Dentistry, University of Baghdad, Iraq.

2Department of Prosthodontics, College of Dentistry, University of Baghdad.

Corresponding Author E-mail: dr.alkarkhi@gmail.com

Abstract: This study aimed to assess the effect of halloysite nanotubes(HNTS) addition into soft denture lining material on thermal conductivity and thermal diffusivity, shear bond strength, tear strength, and surface roughness of the lining material. HNTwith 0.75% and 1% concentration by weight (according to the pilot study) were added into acrylic-based heat cured soft denture liner. One hundred and twenty different specimens were prepared and divided into four groups according to the test to be performed. The thermal conductivity and thermal diffusivity of the soft liner/ HNTS composite were evaluated, shear bond strength, tear strength, and surface roughness were also measured, the results showed that there was a highly significant increase in thermal conductivity of the experimental specimens in comparison with the control specimens and a non-significant change in the thermal diffusivity of the experimental specimens. The shear bond strength between the soft liner and the acrylic denture base and tear strength showed a highly significant increase, but a non- significant difference in the surface roughness test was observed in all experimental specimens. Thus it can be concluded that the addition of HNTS can provide soft liner material with improved thermal conductivity, shear bond strength and tear strength while thermal diffusivity and surface roughness were non-significantly changed when the concentration of HNTs  nanoparticles increased.

Keywords: Halloysite Nanotubes; Soft Denture Liner; Shear Bond Strength; Tear Strength; Thermal Conductivity

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