Abstract
Heat-polymerized resins are common substances utilized for construction of removable dental prostheses (i.e. Orthodontic appliances). Such materials should have appropriate physical properties. The use of disinfectant solutions might influence the physical characteristics of the acrylic materials. This study was conducted to assess the influence of different disinfectants on heat polymerized resins in terms of surface hardness. Forty specimens were made from heat-polymerized acrylic resins in total. The investigation comprised 4 groups according to the disinfectants utilized and each group had ten specimens. The 1st group was immersed in distilled water (control); the 2nd group was disinfected in Efferdent; the 3rd group was disinfected in 4 % Chlorhexidine; and the 4th group was disinfected in 1% hypochlorite. All specimens were tested via a hardness tester three times and the average reading was measured for all specimens. The statistical results indicated a slight decline in the mean values of surface hardness of acrylic specimens following immersion in disinfectants. The greatest value of mean was for distilled water specimens whereas the lowest value of mean was for 4% Chlorhexidine specimens. Furthermore, no significant differences were found among all groups (P>0.05). The study concluded that the use of disinfectants solutions slightly decreases the hardness of heat polymerized resins. It is recommended to evaluate the chemical interaction between the acrylic resins and disinfectants.
Highlights
In removable prosthodontics, heat-polymerized acrylic resins are materials widely utilized for the construction of removable appliances because of their appropriate properties such as excellent aesthetic properties, easy of repair and manipulation, reasonable in price, etc. [1,2]
The results indicated a slight fall in the mean values of surface hardness of the acrylic specimens after soaking in different disinfectants as demonstrated in Table (1)
The results indicated that there was a slight decline in the surface hardness following immersion the acrylic specimens in disinfectants solutions
Summary
Heat-polymerized acrylic resins are materials widely utilized for the construction of removable appliances because of their appropriate properties such as excellent aesthetic properties, easy of repair and manipulation, reasonable in price, etc. [1,2]. Orthodontic appliances are part of orthodontic treatment and utilized for short or long terms to move or retain the teeth [3,4]. Such appliances are considered as a foundation of cross contamination between the dental staff and patients. During their use, they can be colonized and infected by microorganisms, which may spread either via direct contact or through the aerosol produced during finishing and polishing procedures [5,6]. This research was undertaken to assess the effect of using different disinfectants on acrylic resins in terms of surface hardness. The null hypothesis imposed that the surface hardness would be not influenced by disinfectant solutions
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