Effects of accelerated artificial aging on the translucency and color stability of monolithic ceramics with different surface treatments.
J Prosthet Dent
; 121(4): 712.e1-712.e8, 2019 Apr.
Article
em En
| MEDLINE
| ID: mdl-30929661
ABSTRACT
STATEMENT OF PROBLEM:
Different surface finishing procedures can be applied to monolithic restorations. However, information is limited regarding the long-term performance of these procedures.PURPOSE:
The purpose of this in vitro study was to evaluate the effect of aging on the translucency and color stability of monolithic ceramics with different surface finishing procedures. MATERIAL ANDMETHODS:
Disk-shaped (14×1.5 mm) specimens of monolithic zirconia (Zirkonzahn Prettau [ZZ]) and lithium disilicate glass-ceramic (IPS e.max Press [IPS]) were fabricated. The specimens were divided into 3 subgroups according to the surface treatments (n=9, G glazing, R rubber polishing system, and P rubber polishing system followed by polishing paste). Color measurements were made by using a spectrophotometer before and after an ultraviolet aging process. L*, a*, and b* parameters were recorded. ΔE and translucency parameter (TP) values were calculated. One specimen from each subgroup was examined by scanning electron microscopy (×30 000). The data were statistically analyzed using the Mann-Whitney U, Kruskal-Wallis, and post hoc tests (α=.05).RESULTS:
ΔE values of group ZZ (5.03) exceeded the clinically acceptable level (3.5); however, the color change was not clinically perceptible for IPS (0.41). The ΔE value of the subgroup P was found to be higher than that of the others for ZZ (P<.001). The ΔE value was not affected by the surface treatment for IPS. Group IPS showed significantly higher translucency than the ZZ group (P<.001). TP values were not affected by the surface treatment in either material and decreased after aging. However, changes in the TP values were too slight to be clinically perceptible.CONCLUSIONS:
Lithium disilicate ceramic was found to be more esthetic than monolithic zirconia ceramic in terms of color stability and translucency.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Porcelana Dentária
/
Estética Dentária
Idioma:
En
Revista:
J Prosthet Dent
Ano de publicação:
2019
Tipo de documento:
Article