Abstract
The aim of this study is to characterize (wettability, surface roughness and gloss) and test (microhardness and diametral compression) four types of light-cured composite resins, one of which is commercial. The first lab-made composite is the reference, obtained by mechanical mixing of three monomers, in equal concentrations. The following two lab-made materials can be considered nanocomposites because they were mechanically mixed in the base solution (Bis-GMA/TEGDMA/Bis-EMA) with α-Al2O3 nanopowders, with a concentration of 5 wt.% for one solution and 10 wt.% for the other. The benchmark material comparison for these lab-made composite and nanocomposite resins is the bioresin system, Filtek Supreme Ultra Universal Restorative. Results were promising, especially for the 10 wt.% Al2O3/Bis-GMA/TEGDMA/Bis-EMA system, characterized by mechanical improvment in comparison with the reference composite.
Highlights
Composite biomaterials are gaining rapid appreciation in research and industry due to the exceptional versatility of various properties, especially for the nanocomposite types [1]
The mechanical properties are considered of great importance
Roughness The term polishing refers to a surface roughness reduction and scratch-removal occurred by previous finishing process [25]
Summary
Composite biomaterials are gaining rapid appreciation in research and industry due to the exceptional versatility of various properties, especially for the nanocomposite types [1]. Modulus and strengths of dental composites are factors in their development, which are dependent on composition, sample preparation and geometry. These properties are determined through flexural, biaxial flexural, compressive and diametral tensile tests [4,5,6,7]. Another mechanical property is the surface hardness, which in many cases, the Vicker’s hardness method is often used [8, 9]. This method is a good instrument in observing possible crack initiations
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