Comparative Evaluation of Porosities and Solubility for Different Non-Metallic Denture Base Material ZC18-ZC22
Dr. Hamada Zaki Mahross,
Al-Farabi Colleges, Riyadh 11691, P.O.Box 85184, Kingdom Of Saudi Arabia., Cairo, Egypt.
Introduction: Surface Porosities and solubility are undesirable characteristics of PMMA that significantly weaken a denture base and promote staining, harboring of organisms such as Candida Albicans and bond failures between the artificial tooth and denture base resin.
Aim: To evaluate and compare porosities and solubility between thermoplastic flexible and conventional heat cured acrylic resin denture base material.
Materials and Methods: A total of 40 disc samples of thermoplastic and heat cured resin were prepared and divided into 2 groups: group I flexible polyamide resin and group II heat cured resin and then they were further distributed for solubility and porosity testing. Solubility was measured by registering the desorption of the samples that gained water after four weeks then weighed weekly till six weeks. The porosity was estimated quantitatively by total pore volume (W0). An electronic analytical balance was used to weight the samples. The data was collected and statistically analysed using ANOVA test. A paired sample t-test and independent t-test at the significance level of (a = 0.05) were used for comparison between two groups.
Results: The change in solubility over time for flexible and conventional group was statistically non-significant. In comparison between flexible vs. conventional solubility; it was noted statistically non-significant at all storage time. The change in porosity with time for flexible and conventional group was statistically significant.
Conclusion: More porosity of the flexible (thermoplastic polyamide nylon) resin would eventually promote hygiene maintenance. Flexible denture bases may be indicated in patientâ€™s requiring replacement of teeth in aesthetic zone, severe soft and hard tissue undercuts, allergy to acrylic or metal.