J Adv Prosthodont.  2017 Feb;9(1):67-73. 10.4047/jap.2017.9.1.67.

The effect of coloring liquid dipping time on the fracture load and color of zirconia ceramics

• Orhun E

• KMID: 2368214
• DOI: http://doi.org/10.4047/jap.2017.9.1.67

Abstract

PURPOSE
The aims of the study were to evaluate the fracture load of zirconia core material after dipping in coloring liquid at different time intervals and to compare the color of dipped blocks with that of prefabricated shaded blocks.
MATERIALS AND METHODS
3-unit bridge frameworks were designed digitally. Sixty frameworks were fabricated using uncolored zirconia blocks by CAD/CAM and divided into 4 groups randomly (n = 15). Group 2 (G2) was subjected to coloring liquids for 2 minutes, Group 4 (G4) for 4 minutes, and Group 6 (G6) for 6 minutes. CFS group was not subjected to any coloring procedure. After coloring, color differences between the test groups and a prefabricated shaded zirconia group (CPZ, n = 15) were evaluated by using a spectrophotometer. Fracture test was conducted immediately after shade evaluation with a Testometric test device at a cross-head speed of 1 mm/sec. Statistical analysis for evaluating color and fracture load was performed by using one way ANOVA followed by Tukey HSD test (P ≤ .05). Weibull analysis was conducted for distribution of fracture load.
RESULTS
There was no difference in terms of fracture load and color between CFS (1176.681 N) and G2 (985.638 N) group and between CPZ (81.340) and G2 (81.140) group, respectively. Fracture load values of G4 (779.340 N) and G6 (935.491 N) groups were statistically significantly lower than that of CFS group (P ≤ .005). The color values of G4 (79.340) and G6 (79.673) groups were statistically different than that of CPZ group (P ≤ .005).
CONCLUSION
Prolonged immersion of zirconia in coloring liquid not only negatively affected the fracture load of the zirconia being tested in the current study but also deteriorated the desired shade of the restoration.

Keyword

Zirconia; Coloring liquids; Color; Fracture load

MeSH Terms

Ceramics*
Immersion

Figure

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  Fig. 1 Metal master model used in the study.

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  Fig. 2 Test Specimens prepared for G6 test group.

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  Fig. 3 Testing of specimens with Testometric. The indenter was located on the depression of the functional cusp.

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  Fig. 4 Weibull graph.

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