Abstract
AimThe aim of this study was to evaluate the effect of grit-blasting on the color stability of zirconia ceramics following exposure to beverages.MethodA total of 80 planar zirconia specimens were prepared from dense sintered zirconium blocks and were randomly allocated into four groups (n=20). Ten specimens from each group were grit-blasted (GB) using aluminum trioxide powder from a distance of 10 mm. The remaining 10 specimens were used as such without grit-blasting (NGB). The grit-blasted and non-grit-blasted specimens were immersed in artificial saliva, Coffee, Red Bull, and Coca-Cola at room temperature over a 28-day test period. Color measurement (ΔE) of the zirconia specimens was performed at baseline (T0) and after seven (T1), 14 (T2), and 28 (T3) days of immersion in the beverages using the Color Eye 7000A Spectrophotometer (Gretag Macbeth, New Windsor, NY). The data were analyzed using analysis of variance (ANOVA) and the post-hoc Bonferroni test. A p-value of less than 0.05 was considered statistically significant.ResultThe GB specimens immersed in coffee showed the highest color changes as compared to other groups (4.47± 0.04) and the NGB specimens stored in saliva showed the lowest ΔE values (0.83± 0.03). Energy drinks and soft drinks showed similar ΔE values at the end of the 28-day study period in both the NGB and GB groups. All the specimens, irrespective of the beverages, in both groups showed increased ΔE values at different immersion periods except for NGB specimens immersed in saliva, which showed decreased ΔE values from T2 to T3.ConclusionGB specimens showed increased ΔEs compared to NGB Zirconia ceramics. Among the beverages, the coffee immersion of GB specimens showed marked color changes. The specimens immersed in the energy and acidic drinks from both groups showed perceivable color changes at the end of the 28-day study period.
Highlights
There is always a constant quest for the use of aesthetic biomaterials in restorative dentistry
The specimens immersed in the energy and acidic drinks from both groups showed perceivable color changes at the end of the 28-day study period
The inert characteristics of zirconia ceramic are the acid-resistant polycrystalline structure, which results in weak bonding to resin composites [4]
Summary
There is always a constant quest for the use of aesthetic biomaterials in restorative dentistry. Zirconium dioxide (ZrO2) or zirconia (commonly, yttria-stabilized) are the widely used aesthetic material in restorative dentistry. Yttria (3 mol%) is added to biomedical grade zirconia to stabilize the crystal structure transformation during sintering thereby improving their mechanical properties [3]. The inert characteristics of zirconia ceramic are the acid-resistant polycrystalline structure, which results in weak bonding to resin composites [4]. It is recommended to roughen the zirconia surface to create an irregular surface to allow the free movement of resin composites into the irregularities. This aspect is highly applicable for orthodontic bonding in which the orthodontic brackets are retained onto the roughened zirconia surface by resin composites. Grit blasting with alumina particles is the most effective method for the surface roughening of zirconia-based ceramics with the least damage to the surface [5]
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