The effect of processing methods and acrylic resins on the accuracy of maxillary dentures and toothless denture bases: An in vitro study

• Autores: Henrike Venus, Klaus W. Böning, Ingrid Peroz
• Localización: Quintessence International, ISSN-e 0033-6572, Vol. 42, Nº. 8, 2011, págs. 669-677
• Idioma: inglés
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• Resumen

  • Objective: To compare the dimensional changes of two autopolymerising denture base resins using three different processing techniques. Method and Materials: Sixty edentulous denture bases were made from the polymethylmethacrylates FuturaGen and PalaXpress. Ten bases were made from each resin using a manual injection technique (MI), a pneumatic injection technique (PI), and the fluid resin technique (F). Posterior palatal gap widths between casts and denture bases were measured. For an additional three-dimensional examination of occlusal changes, 10 maxillary dentures were made using FuturaGen/MI and 10 using PalaXpress/PI. Intermolar widths and changes in vertical dimension were determined. In all groups, measurements were taken after polymerization, after removal and repositioning, after polishing, and after storage in water for 1 and 3 weeks. Data were analyzed by using two-way ANOVA and Tukey test (P < .05). Results: There were no differences in dimensional changes of FuturaGen and PalaXpress specimens. The pneumatic injection system produced significantly smaller posterior palatal gaps after storage in water for 3 weeks compared to the manual injection system (P < .0005) and the fluid resin technique (P = .003). The posterior gaps of dentures were