Effect of Low-Temperature Degradation, Ph-Cycling and Simulated Tooth Brushing on Surface Roughness, Topography, and Polish Retention of Yttrium-Stabilized Tetragonal Zirconia

Autor: Foroogh Fadavi, Mahshid Mohammadi-Bassir, Nioosha Sarabi, Mohammad Bagher Rezvani, Siavash Jafari-Semnani, Maryam Rastegar Moghaddam, Hossein Labbaf
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Journal of Dentistry, Vol 24, Iss 3, Pp 293-304 (2023)
Druh dokumentu: article
ISSN: 2345-6485
2345-6418
DOI: 10.30476/dentjods.2022.93896.1744
Popis: Statement of the Problem: Surface roughness of zirconia is an important parameter that determines the success of zirconia restorations. When zirconia surfaces are left rough, higher susceptibility to hydrothermal aging, plaque accumulation and color changes would occur. Therefore, polish retention of these restorations is considered as a challenge.Purpose: The purpose of this in vitro study was to determine the effect of hydrothermal degradation, pH- cycling, and simulated tooth brushing on surface roughness, topography, and polish retention of an yttrium-stabilized monolithic zirconia.Materials and Method: In this experimental study, 64 specimens of yttria-stabilized tetragonal zirconium oxide (20×4×2mm) were prepared (ZirKonzahn, Steger, Ahrntal). The specimens were wet- polished (standard polishing), and divided into 8 groups (n=8). Four control groups were assessed in non-aged condition while in 4 experimental groups the artificially ageing was done. Different finishing and polishing procedures were performed in 8 groups. The surface roughness values including mean surface roughness (Ra) and mean height of surface roughness (Rz) was measured by a profilometer. The results were analyzed using two-way ANOVA and Tukey’s HSD test (α=0.05). One representative specimen of each group was inspected under a scanning electron microscope (SEM) for assessment of surface topography.Results: The effects of surface treatments on Ra (p
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