Abstract

Background: the soft liners are designed to have low compliance. Therefore, they appear to absorb a lot of occlusal forces (cushioning effect) by distortion (elastic deformation). Such material adapts very well to the mucosa in the unloaded situation and can provide appropriate retention and resistance for prostheses.

Methods: This study include Incorporation of Chitosan nano-particles into soft liner monomer in concentration (0% control, 1.5%, 2% by wt.) to determine the effect of chitosan addition into the soft lining material on tensile strength and peel bond strength. for each group , 10 specimens were prepared. For tensile strength test 30 specimens with central cross section area (33mm length, 3mm width, 6mm depth) were prepared according to (ASTM D412). For peel bond strength test 30 specimens were prepared according to (ASTM D903-93) specification.

Results: An Improvement in the tensile strength and a reduction to limited degree of Peel bond strength of soft lining material after adding different percentage of chitosan nano-particles (1.5%, and 2% by wt. incorporation).

Conclusion: The tensile strength of soft liner was increased after 1.5% and 2% by wt. chitosan incorporation, which makes the soft liner more resistant to forces attempting to create plastic deformation, while the Peel bond strength was reduced to a limited degree after adding different percentage of chitosan nano-particles.

Keywords: Chitosan, Nano-Particles, Soft Denture Lining Material.