Abstract
ABSTRACT Objective: The aim of this study is to analyze if both color and nylon fibers have an influence on microwave-cured acrylic resin properties. Methods: Rectangular and disk-shaped specimens were prepared using acrylic resins; medium pink with and without nylon fibers and colorless without nylon fibers. To obtain the rectangular specimens, a stainless steel die was used with the following dimensions: 64 X 10 x 3 mm (± 0.5mm). To obtain disk-shaped specimens, a die 50mm (±0.5mm) in diameter and 0.5mm (±0.05mm) thick was employed. They were randomized to form groups: control (colorless acrylic) and experimental (medium pink, with and without nylon fibers), with each group consisting of ten (10) specimens rectangular in shape and five (5) disk-shaped. They were analyzed in six (6) assays (izod impact strength, n=10; Knoop hardness, n=10; glass transition temperature, n=3; water sorption and solubility, n=5; degree of monomer/polymer conversion, n=1; flexural strength and flexural modulus, n=10). All variables were subjected to the analysis of variance test followed by Tukey's multiple comparison test, at a 5% level of significance. Results: The analysis of the monomer/polymer degree of conversion did not reveal any difference between the three groups of resins (medium pink, with and without nylon fibers and colorless resin); it was approximately 88%. The results did not show significant differences between the groups for each variable (p>0.05). Conclusion: The results showed that color and presence of nylon fibers in acrylic resins did not affect the properties analyzed in this study.
Highlights
METHODSThe restoration of masticatory function and aesthetics is an important aim in dentistry, mainly when patients present with extensive tooth loss
The analysis of the monomer/polymer degree of conversion did not reveal any difference between the three groups of resins; it was approximately 88%
The results showed that color and presence of nylon fibers in acrylic resins did not affect the properties analyzed in this study
Summary
METHODSThe restoration of masticatory function and aesthetics is an important aim in dentistry, mainly when patients present with extensive tooth loss. For a long time polymethylmethacrylate (PMMA) has dominated the field of denture base materials[1]. This material presents adequate strength to withstand masticatory forces, maintains dimensional stability, adequate resilience, biocompatibility and high polishability. It is available in both powder and liquid form for use and processing. The powders are pure polymers, which are clear and adaptable to a wide range of pigments that are used to obtain the various shades of oral tissue and include compounds such as mercury sulfide, cadmium sulfide, cadmium selenide and ferric oxide. Nylon fibers have been successfully used to match the minute blood vessels of oral mucosa[4]
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