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The Effect of Two Types of Separating Medium and Investment Materials on Some Physical Properties of Acrylic and Nylon Denture Base Materials | ||
| Kerbala Journal of Medicine | ||
| Article 1, Volume 6, Issue 2, 2013, Pages 1675-1683 PDF (0 K) | ||
| Authors | ||
| Suad Jafar Alnakash; Nagham Bahjat Kamil; Farah Nabeel Mohammed Tahir Al-Khayyat | ||
| Abstract | ||
| background: The relatively rough surface of gypsum mould may be penetrated by acrylic denture base resin and adhere to it, to prevent this, a separating medium must be employed. Objectives: The aim of this study is to evaluate the effect of separating medium substitute and investment materials on Surface roughness, Water sorption and solubility of acrylic and nylon denture base materials. Material and method: Two types of separating medium were chosen (Cold mold seal and glycerin). 160 specimens were prepared from heat cure and Valplast resins. Each main group was subdivided into four subdivisions according to the type of investment material and separating medium used; each group of them contains 10 specimens for each test. After processing of both resins, some physical properties such as water sorption, solubility and surface roughness have been evaluated according to investment material and compared with those processed using cold mold seal and glycerin. Result: In this study, the surface roughness and water solubility of both base materials are significantly higher when using cold mold seal than glycerin. Mean value of heat-cure acrylic resin shows high water sorption than that of Valplast. When compared by ANOVA test, there is no significant difference between groups in both investment materials. Conclusion: The use of glycerin as a separating medium leads to smoother surfaces of both denture base materials, while for water sorption, neither the separating medium nor the investment material has an effect on it. Cold mold seal leads to higher water solubility of both base materials regardless of the type of investment material. | ||
| Keywords | ||
| Separating medium; heat cure resin; Valplast; physical properties | ||
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