The effect of dental LED light‐curing unit photoactivation mode on 3D surface morphology of dental nanocomposites evaluated by two‐dimensional multifractal detrended fluctuation analysis

• DOI: 10.1002/jemt.23123
• Publication Date: 2018-10-23T21:46:03Z
• Authors: Ştefan Ţălu; Ram Pratap Yadav; Tijana Lainović; Alia Méndez‐Albores; Gabriel Trejo; Dragan Kukuruzović; Negin Beryani Nez...; Azizollah Shafiek...; Shahram Solaymani
• Keywords: Curing Lights, Dental; Nanocomposite; Surface Properties; 2D multifractal detrended fluctuation analysis; LSPR; 02 engineering and technology; Microscopy, Atomic Force; Composite Resins; Nanocomposites; Nanosensors; Atomic force microscopy; Surface roughness; DLC; Materials Testing; Humans; Composite dental resin; 0210 nano-technology; Photoactivation modes

AbstractThe objective of this study was to evaluate the effect of two photoactivation modes of dental LED light‐curing unit (LCUs) (conventional and “Soft Start” mode) on surface texture parameters of two dental resin‐based nanocomposites. LED LCUs were considered as standard light‐curing devices in contemporary dental practice. Atomic force microscopy (AFM) was applied to investigate surface morphology on 90 × 90 μm2 scanning area through 2D multifractal detrended fluctuation analysis with computational algorithms basis. In order to compare 3D surface roughness at nanometer scale, singularity spectrum f[α] was used which characterize local scale properties of multifractal nature of samples. The results confirmed that larger spectrum width Δα (Δα = αmax − αmin) of f(α) is associated with non‐uniform surface morphology. Moreover, materials whose polymerization was photoactivated by the “soft start” polymerization mode, showed better quality of the surface microstructure with lower values of AFM surface texture parameters.