Impact of Sorts Disinfection and Cleansing Material on Hardness of Different Types of Denture Base Material

Abstract

Dentist, dental technician and assistants are faced a several kinds of microorganisms during worklike bacteria, fungi and viruses .So, we can prevent cross contamination by using either chemicalor mechanical disinfection. The aim of the research was to measure the effect of different typesof chemical disinfection on the hardness of two types of denture base resin, heat activated acrylicand nylon (flexible). A total number of 80 denture resin specimens (40 specimens from heatactivated acrylic and 40 specimens from flexible resin) were prepared. Each type of specimenwas subdivided into 4 groups. Three groups were divided according to the type of denturedisinfectants (1%sodium hypochlorite, 1% povidine/iodine, Kin solution) and the fourth whichconsidered as control group was immersed in distilled water. All specimens were immersed intesting solution for 90 minutes at 370C. The hardness of the specimens before and afterimmersion was tested using Shore D machine. Our study showed that the mean value ofhardness test for poly methyl methacrylate higher than polyamide and there need aid nonsignificantContrast in the resistance of the surface to scratches and indentation between diversesorts of thermoplastic resin after using chemical disinfectant and denture cleansers withcomparison with control group for each type of denture base resin. The resistance to indentationof different types of denture base would not affected by short time immersion in chemical