Investigating Tensile Bonding and Other Properties of Yttrium Oxide Nanoparticles Impregnated Heat-Cured Soft-Denture Lining Composite In Vitro

AIMS: This study was conducted to assess the effect of the addition of yttrium oxide (Y(2)O(3)) nanoparticles on the tensile bond strength, tear strength, shore A hardness, and surface roughness of soft-denture lining material. MATERIALS AND METHODS: Y(2)O(3) NPs with 1.5 and 2 wt.% were added into acrylic-based heat-cured soft-denture liner. A total of 120 specimens were prepared and divided into four groups according to the test to be performed (tensile bond strength, tear strength, surface hardness, and surface roughness). RESULTS: There was a highly significant increase in tensile bond strength between the soft liner and the acrylic denture base, tear strength, and hardness at both concentrations as compared to the control group, whereas there was a nonsignificant difference between 1.5wt% of Y(2)O(3) nanoparticles and the control group, and between 1.5wt% and 2wt% of Y(2)O(3) nanoparticles. But there was a significant difference between 2wt% of Y(2)O(3) nanoparticles and the control group. CONCLUSION: The Y(2)O(3) nanoparticles impregnated in soft-lining materials increased the mechanical properties of both tensile bonding strength and tear strength. Also, there was a significant increase in hardness but there was no change in surface roughness of acrylic-based denture soft-lining materials.