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

Abstract

The 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.

Topographic characterization of canine teeth using atomic force microscopy images in nano-scale

“…Moreover, frequency distribution versus frequency are calculated by FFT and finally PSD functions as |F(x, y)| 2 in which F(x, y) are FFT coefficients. On the other hand, normalizing PSD reaches units of (length) 4 [15].…”

“…Surface morphology at nanoscale is a key factor in technological applications as well as fundamental science [1][2][3]. In the past decade, atomic force microscope (AFM) images were considered as the best source of information about surface topography obtained through a very small probe which forms the profile of the surface morphology quantitatively [4]. There exist various types of methods which give information about surface texture, i.e.…”

Micromorphology analysis of TiO2 thin films by atomic force microscopy images: The influence of postannealing

“…Fractal analysis has already been successfully used in science and engineering (Dallaeva et al, ; Ţălu et al, , ). It is very difficult to describe surface the morphology of irregular nanostructures just with the traditional Euclidean geometry, but fractal and multifractal geometries, as improved mathematical tools, can be applied to investigate complex 3D structures with high precision (Odling, ; Ţălu et al, ).…”

Microstructure, micromorphology, and fractal geometry of hard dental tissues: Evaluation of atomic force microscopy images

“…Recently, applications of nanotechnology in dentistry have been reported in order to improve tooth properties (Salerno & Diaspro, ; Ţălu et al, ; Ţălu, Yadav, Lainović, et al, ; Uskoković & Bertassoni, ). Enamel, dentin, and cementum as the hard tissue along with dental pulp are the main parts of every natural tooth.…”