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, 12 (7)

Optical and Surface Properties of Monolithic Zirconia After Simulated Toothbrushing

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Optical and Surface Properties of Monolithic Zirconia After Simulated Toothbrushing

Jae-Hyun Lee et al. Materials (Basel).

Abstract

This in vitro study investigated the impact of various dentifrices on the shade, translucency, gloss, and surface characteristics of polishing- or glazing-finished monolithic zirconia surfaces after simulated toothbrushing. Eighty square-shaped monolithic zirconia specimens were divided into two major groups based on the finishing methods-polished (P) and glazed (G). Next, specimens from the two major groups were categorized into four subgroups: stored in distilled water (DW, control); brushed with a fluoride-free conventional dentifrice (C); brushed with a fluoride dentifrice (F); and brushed with a whitening dentifrice (W). Overall, eight groups were created-PDW, PC, PF, PW, GDW, GC, GF, and GW (n = 10 each). Shade, translucency, surface gloss, surface roughness, crystalline phase, and superficial topography data were obtained. Repeated-measures ANOVA and two-way ANOVA were used for intergroup comparison (all α = 0.05). The color differences (ΔE00) between pre- and posttreatment were 0.3158 (PDW), 0.7164 (PC), 0.7498 (PF), 0.8106 (PW), 0.1953 (GDW), 0.301 (GC), 0.3051 (GF), and 0.4846 (GW). A statistically significant difference was observed among the ΔE00, surface gloss, and surface roughness of monolithic zirconia. Thus, brushing with several dentifrices markedly affects the optical properties and surface characteristics of monolithic zirconia finished with polishing or glazing methods.

Keywords: dentifrice; optical property; surface roughness; toothbrushing; zirconia.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Specimen preparation.
Figure 2
Figure 2
Schematic drawing of the customized fixture, zirconia specimen, orthodontic elastics, and electric toothbrush.
Figure 3
Figure 3
Color changes (ΔE00) of polished or glazed monolithic zirconia specimens between the baseline and simulated brushing time.
Figure 4
Figure 4
CIE L* of polished or glazed monolithic zirconia specimens according to simulated brushing time.
Figure 5
Figure 5
Confocal laser scanning microscope images of groups (fields of view: 320 µm × 320 µm). (A), polished surface and storage in distilled water (PDW). (B), polished surface and brushed with a conventional dentifrice (PC). (C), polished surface and brushed with a fluoride dentifrice (PF). (D), polished surface and brushed with a whitening dentifrice (PW). (E), glazed surface and storage in distilled water (GDW). (F), glazed surface and brushed with a conventional dentifrice (GC). (G), glazed surface and brushed with a fluoride dentifrice (GF). (H), glazed surface and brushed with a whitening dentifrice (GW).
Figure 6
Figure 6
X-ray diffraction patterns of experimental groups in the 2-theta range from 20 to 60. t, Tetragonal zirconia phase; m, monoclinic zirconia phase; PDW, polished surface and storage in distilled water; PC, polished surface and brushed with a conventional dentifrice; PF, polished surface and brushed with a fluoride dentifrice; PW, polished surface and brushed with a whitening dentifrice; GDW, glazed surface and storage in distilled water; GC, glazed surface and brushed with a conventional dentifrice; GF, glazed surface and brushed with a fluoride dentifrice; GW, glazed surface and brushed with a whitening dentifrice.
Figure 7
Figure 7
Scanning electron microscopy (SEM) images of groups (original magnification, ×5000). (A), polished surface and storage in distilled water (PDW). (B), polished surface and brushed with a conventional dentifrice (PC). (C), polished surface and brushed with a fluoride dentifrice (PF). (D), polished surface and brushed with a whitening dentifrice (PW). (E), glazed surface and storage in distilled water (GDW). (F), glazed surface and brushed with a conventional dentifrice (GC). (G), glazed surface and brushed with a fluoride dentifrice (GF). (H), glazed surface and brushed with a whitening dentifrice (GW).

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