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문제 정의
- Significant translucency differences were detected among the zirconia-based all-ceramic systems tested in this study. For esthetic appearance, more translucent zirconia systems like VYZ and KTN may be preferred whereas for masking discoloration less translucent systems may be more advantageous.
제안 방법
- Specimens were further divided into 3 groups (n=11) for coloring to A1, A2 and A3.5 shades according to Vitapan Classical Shade Guide (VITA Zahnfabrik, Bad Säckingen, Germany).
- Specimens were subdivided into 3 groups and immersed in coloring liquids LL1, LL2, and LL3 (Coloring Liquid for VITA In-Ceram 2000 YZ CUBES, Bad Säckingen, Germany) equivalent to A1, A2, and A3.5 shades, respectively, for 2 minutes.
- However, to the best of authors’ knowledge, there is no literature regarding the effect of coloring techniques on the translucency of zirconia. The purpose of this in vitro study was to evaluate the translucency of zirconia core specimens in 3 different shades and veneered specimens of different zirconia-based all-ceramic systems, and compare the coloring techniques in terms of translucency. The hypothesis tested was that the coloring technique would affect the translucency of specimens and precolored specimens would show a greater translucency.
- Translucency measurements were performed with a clinical spectrophotometer (VITA Easyshade Compact, VITA Zahnfabrik, Bad Säckingen, Germany).
대상 데이터
- For surface finishing, a polishing machine (Phoenix Beta, Buehler, IL, USA) and 400, 600, 800, 1000 and 1200 grades of silicon carbide papers (Buehler Abrasives, Düsseldorf, Germany) were used.
- Thirty-three VYZ core specimens were fabricated from In-Ceram YZ blocks (VITA In-Ceram 2000 YZ CUBES for inLab) milled with CAD/CAM system (Cerec inLab, Sirona Denatl Systems, Bensheim, Germany) in partially sintered state. Specimens were subdivided into 3 groups and immersed in coloring liquids LL1, LL2, and LL3 (Coloring Liquid for VITA In-Ceram 2000 YZ CUBES, Bad Säckingen, Germany) equivalent to A1, A2, and A3.
데이터처리
- Normality of the data distribution was checked by the Shapiro–Wilks test and parametric tests were chosen since the data were distributed normally. TP values of A1, A2 and A3.5 shaded core, veneered, and glazed specimens of the same all-ceramic system (intragroup comparison) and TP values of the same shaded core, veneered, and glazed specimens of different all-ceramic systems (intergroup comparison) were analyzed by repeated-measures ANOVA using the SPSS software version 10.0 (SPSS Inc., Chicago, IL, USA). Post hoc comparisons were performed by using the Tukey test when significance was detected.
이론/모형
- Normality of the data distribution was checked by the Shapiro–Wilks test and parametric tests were chosen since the data were distributed normally.
성능/효과
- Translucency of the veneer ceramics were not known because as a limitation of the study, TP values of veneer ceramics were not evaluated separate from the core ceramics. However, the data obtained from this study showed that the translucency of veneer ceramic is as important as the translucency of core material since the TP values decreased and the translucency ranking of the systems changed after veneering. A previous study by Heffernan et al.
- The purpose of this in vitro study was to evaluate the translucency of zirconia core specimens in 3 different shades and veneered specimens of different zirconia-based all-ceramic systems, and compare the coloring techniques in terms of translucency. The hypothesis tested was that the coloring technique would affect the translucency of specimens and precolored specimens would show a greater translucency.
- In the present study, lithium disilicate based glass ceramic specimens showed higher translucency compared to zirconia-based all-ceramic systems. The hypothesis that coloring technique of zirconia would affect the translucency and precolored zirconia cores would have a greater translucency was partially rejected because the statistical analysis revealed that precolored KTN core specimens were more translucent than ICE core specimens; however, VYZ and KTN core specimens were not superior to each other in terms of translucency. Therefore, according to the results of the present study, it cannot be suggested that precolored zirconia cores have a greater translucency.
후속연구
- The authors30 suggested that the crystal volume and size of veneer ceramic, increased specimen thickness, reflectance at the interface between the core and veneer ceramic, and the changes occurred in core material after additional firing might cause the translucency difference. According to the results of this study, it can be suggested that the translucency of veneer ceramics should also be considered in evaluation of the overall translucency of the zirconia-based allceramic systems. However, glazing did not cause a significant change in the translucency of the veneered specimens.
- The tablet shape of the specimens may be another limitation since the specimens in coping form may be of greater clinical relevance. Further studies are required to evaluate shaded zirconia core specimens in coping forms with different core/veneer thicknesses.
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