Influence of the artificial saliva storage on 3-D surface texture characteristics of contemporary dental nanocomposites.
The aim of this study was to analyse the influence of the artificial saliva on a three-dimensional (3-D) surface texture of contemporary dental composites. The representatives of four composites types were tested: nanofilled (Filtek Ultimate Body, FUB), nanohybrid (Filtek Z550, FZ550), microfilled (Gradia Direct, GD) and microhybrid (Filtek Z250, FZ250). The specimens were polymerised and polished by the multistep protocol (SuperSnap, Shofu). Their surface was examined, before and after 3 weeks' exposure to artificial saliva storage. The surface texture was analysed using the atomic force microscope (AFM). The obtained images were processed to calculate the areal autocorrelation function (AACF), anisotropy ratio Str(texture aspect ratio), and structure function (SF). The log-log plots of SF were used to calculate fractal properties, such as fractal dimension D, and pseudo-topothesy K. The analysis showed changes in surface anisotropy ratio Strvalues, which became higher, whereas the Sqroughness (root-mean-square) reduced after the artificial saliva storage. All the samples exhibited bifractal structure before the saliva treatment, but only half of them remained bifractal afterwards (GD, FZ250), whereas the other half turned into a monofractal (FUB, FZ550). The cube-count fractal dimension Dccwas found to be material- and treatment-insensitive.
Faculty of Mechanical Engineering, Department of AET, Discipline of Descriptive Geometry and Engineering Graphics, Technical University of Cluj-Napoca, Cluj, Romania.
Ştefan
Ş
Ţălu
Faculty of Technical Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland.
Miroslaw
M
Bramowicz
Faculty of Mathematics and Computer Science, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland.
Slawomir
S
Kulesza
Faculty of Medicine, School of Dentistry, University of Novi Sad, Novi Sad, Serbia. tijana.lainovic@gmail.com.
Tijana
T
Lainović
Faculty of Technical Sciences, Department for Production Engineering, University of Novi Sad, Novi Sad, Serbia.
Marko
M
Vilotić
Faculty of Medicine, Department of Restorative Dentistry and Endodontics, School of Dentistry, Clinic of Dentistry of Vojvodina, University of Novi Sad, Novi Sad, Serbia.
Larisa
L
Blažić
D003188:Composite Resins / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D053761:Nanocomposites / Q000648:ultrastructure*; D012464:Saliva, Artificial; D013499:Surface Properties
D003188:Composite Resins; C444701:Filtek Z250; C000612973:Filtek Z550; C470230:Gradia; D012464:Saliva, Artificial
Areal autocorrelation function; atomic force microscopy; dental nanocomposite; fractal analysis; surface texture