Effects of whitening dentifrice on yttria-stabilized tetragonal zirconia polycrystal surfaces after simulating brushing

Abstract Statement of problem The changes that occur after brushing yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) are unknown. These changes may favor the retention of microorganisms and chemisorption of water, impairing its longevity. Objective The purpose of this in vitro study was to...

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Bibliographic Details
Published in:The Journal of prosthetic dentistry 2017-01, Vol.117 (1), p.158-163
Main Authors: Pinelli, Lígia Antunes Pereira, DDSc, PhD, Gimenes Olbera, Amanda Caroline, Candido, Lucas Miguel, Miotto, Larissa Natiele, Antonio, Selma Gutierrez, DDSc, PhD, Fais, Laiza Maria Grassi, DDSc, PhD
Format: Article
Language:English
Subjects:
Dentifrices - adverse effects
Dentistry
In Vitro Techniques
Surface Properties
Toothbrushing - adverse effects
Yttrium - standards
Zirconium - standards
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Summary:Abstract Statement of problem The changes that occur after brushing yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) are unknown. These changes may favor the retention of microorganisms and chemisorption of water, impairing its longevity. Objective The purpose of this in vitro study was to evaluate the effects of a whitening dentifrice on Y-TZP surfaces after simulating 10 years of brushing. Material and methods Seventy-two bar-shaped specimens (20×4×1.2 mm) were divided into 4 groups: storage in distilled water (SW, control), brushing with distilled water (BW), brushing with dentifrice (BD), and brushing with whitening dentifrice (BWD). Brushing was conducted using a linear brushing machine (878 400 cycles, 0.98 N, soft toothbrush). The mean roughness (Ra) was analyzed with a profilometer and the superficial topography with scanning electron microscopy (SEM) at baseline and after treatment. Crystalline phases were characterized using x-ray diffraction. Baseline and posttreatment Ra were analyzed using the 1-way ANOVA and Tukey HSD multiple comparison test; the paired t test was used for intragroup comparison (all α=.05). Results The Ra (μm) means (before/after treatment) were SW 0.28/0.28; BW 0.32/0.31; BD 0.28/0.36; BWD 0.30/0.20. No statistically significant difference was found for Ra at baseline ( P =.108) than for posttreatment results ( P
ISSN:0022-3913
1097-6841
DOI:10.1016/j.prosdent.2016.05.005