Abstract
Background: Despite the development of many denture base material like chrome-cobalt, fluid and plastic material but the heat cure polymethylmethacrylate considered as the most widely used denture base material. The aims of this study to evaluate and compare the impact strength and surface roughness of heat cured denture base resin after immersing in coca-cola drink for two and four weeks. Methods: A total number of 40 samples were prepared, 30 samples for impact strength test and 10 samples for surface roughness test. The samples were divided into three group; A (control), B (2 weeks immersed in coca cola drink), and C (4 weeks immersed in coca cola drink). Result: Data analyzed by using SPSS software with ANOVA test indicated a non significant differences between the different tested groups, however the samples that were immersed in coca cola drink for 4 weeks revealed non dramatic increase in surface roughness, while the samples that were immersed for 2 weeks showed a non dramatic decrease in the impact strength. Conclusions: The coca cola drink non significantly caused dropping in the tested properties in comparison to the control group.
Highlights
In 1937 polymethyl methacrylate was introduced by Dr Walter, Wright1 and the Vernon brothers. but the material at that time was lacking to good esthetic, mechanical strength and other physical properties, thanks to the chemical properties of the PMMA and its ease of processing that allows huge modifications to take place and changes several properties of this material to reach acceptable esthetics, mechanical and physical properties. [8, 11] Since that time polymethyl methacrylate resin polymers undergo several modifications to improve the construction of denture bases, a day 95% of all dentures are made from polymethyl methacrylate polymers. [8, 9] The presence of Saliva and Oral fluids and the oral consumption of the individuals have their effect on the denture base and teeth
When artificial acrylic teeth and denture base are exposed to the oral cavity, they will be in contact with saliva, beverages, and cleaning agents, and such materials are prone to the absorption and adsorption processes to denture base resins. [5, 10,12,15]
The result showed a nonsignificant difference in the statistical analysis for the tested groups, but there was a slight drop in the impact strength and surface roughness parameters recorded that indicates the influence of carbonated beverage solutions on the denture base resin
Summary
In 1937 polymethyl methacrylate was introduced by Dr Walter, Wright and the Vernon brothers. but the material at that time was lacking to good esthetic, mechanical strength and other physical properties, thanks to the chemical properties of the PMMA and its ease of processing that allows huge modifications to take place and changes several properties of this material to reach acceptable esthetics, mechanical and physical properties. [8, 11] Since that time polymethyl methacrylate resin polymers undergo several modifications to improve the construction of denture bases, a day 95% of all dentures are made from polymethyl methacrylate polymers. [8, 9] The presence of Saliva and Oral fluids and the oral consumption of the individuals have their effect on the denture base and teeth. Vol. (2), ISSN: 2617-1260 (print), 2617-8141(online) www.kjps.isnra.org the denture base materials. These fluids have a tendency to interfere or weakened the chains which are already formed by means of polymerization. [8] The phenomena that responsible for the soluble substances leached out during storage in water and in the oral fluids termed solubility. This phenomena cause deleterious changes in the denture base material. These changes may include mechanical and physical changes such as swelling and plasticization and softening, and chemical changes such as oxidation and hydrolysis. Keeping this as a background this in vitro study is proposed
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