The Aesthetic Effect of All-Ceramic Pressed Crowns According to the Thickness and Color of the Materials Used - An In Vitro Study

2013 ◽  
Vol 587 ◽  
pp. 349-355
Author(s):  
Sergiu Drafta ◽  
Adelina Popescu ◽  
Vlad Naicu
Keyword(s):  
Human Eye ◽  
Color Parameters ◽  
Varying Thickness ◽  
Dental Abutment ◽  
All Ceramic ◽  
Materials Used ◽  
The Aesthetic ◽  
Ceramic Restorations ◽  
Final Color

The final color of all-ceramic restorations may be influenced by the varying thickness of the dental abutment. Eighty A2 color (MO and LT) ceramic discs and eighty A3.5 color and four different thicknesses composite discs of were produced. The measurements were performed using the Vita Easyshade spectrophotometer. The results were statistically analyzed. Conclusion: There are no significant differences (perceived by the human eye) of the color parameters in the CIE L*a*b* system when comparing different combinations.

The Effect of Liner Thickness on the Color of Y-TZP Based All-Ceramic Restorations

2013 ◽  
Vol 544 ◽  
pp. 380-383
Author(s):  
Ruo Yu Liu ◽  
Yao Kun Zhang ◽  
Shan Yu Zhou ◽  
Chen Hu ◽  
Dong Dong Jing ◽  
...  
Keyword(s):  
Color Difference ◽  
Core Material ◽  
Control Group ◽  
Ceramic System ◽  
Eye Color ◽  
Human Eye ◽  
Color Parameters ◽  
All Ceramic ◽  
Ceramic Restorations ◽  
Different Thickness

To evaluate the effect of various liner thickness on the color of Y-TZP based all-ceramic restorations. Forty disc specimens (10 mm diameter, 0.5 mm thick) were fabricated from IPS e.max ZirCAD core material. The specimens were randomly divided into four groups (n=10) according to layering with different ZL1 IPS e.max ZirLiner thicknesses as: 0.1 mm, 0.2 mm, 0.3 mm and one group had received no treatment as the control group. And 0.6 mm veneering porcelain was fired on the IPS e.max ZirCAD core material by traditional layering technique. Using a spectrophotometer to measure Color parameters L, a and b of the specimens after veneered. ΔE were calculated to compare color difference among the four groups. Intergroup differences of ΔE in different thicknesses were statistically significant at P<0.05. The ΔE between groups with different thickness were 2.03±0.07, 2.88±0.07, 3.54±0.07, 0.86±0.06, 1.47±0.06 and 0.67±0.06 respectively.Usually researchers apply ΔE=1.5 as the threshold for distinguishing two different colors by the human eye. Color difference ΔE between different groups with and without liner application was more than 1.5, which was in the perceptible range, but ΔE of liner application with the thickness of 0.1 mm, 0.2 mm and 0.3 mm were undistinguishable by human eye (ΔE<1.5). Thus liner application of the all ceramic system could significantly affected the final color of the all ceramic restorations and it ameliorated esthetics of Y-TZP all-ceramic restorations to good purpose. However, Changes in the thickness (0.1 mm-0.3 mm) of liner application have no significant effect on the final shade of Y-TZP based all-ceramic restorations.

scholarly journals Effect of the framework material on the final color of all-ceramic restorations

2013 ◽  
Vol 1 (3) ◽  
pp. 219
Author(s):  
Márcia Borba ◽  
Queli Nunes Sonza ◽  
Álvaro Della Bona
Keyword(s):  
Tetragonal Zirconia ◽  
Color Difference ◽  
Polycrystalline Alumina ◽  
Mean Values ◽  
Framework Materials ◽  
Significant Difference ◽  
All Ceramic ◽  
Ceramic Restorations ◽  
Study Hypothesis ◽  
Final Color

OBJECTIVES: to evaluate the effect of the type of ceramic framework material on the final color of all-ceramic restorations. The hypotheses tested were: (1) the final color of the restoration is different than the porcelain shade selected initially to veneer the framework and (2) different framework materials result in different colors of all-ceramic restorations. METHODS: Steel models simulating abutment teeth were used to design all-ceramic fixed partial dentures (FPDs). The FPDs were produced using three different framework materials (n=8): (YZ) yttria partially stabilized tetragonal zirconia polycrystal (LAVA, 3M); (IZ) glass-infiltrated alumina/zirconia (Vita In-Ceram Zirconia); (AL) polycrystalline alumina (Vita In-Ceram AL). Each framework was veneered with the recommended porcelain, VM9 for YZ and VM7 for IZ and AL groups (Vita). The porcelain shade used was 2M2. A uniform thickness of 1.2 mm of porcelain was applied around the retainers. The color difference (ΔE) and lightness difference (ΔL) between the selected porcelain shade (2M2) and the color of the final restoration were obtained using a clinical spectrophotometer (VITA Easyshade). Statistical analysis was performed using One-Way ANOVA and Tukey’s test (α=0.05). RESULTS: The ΔE mean values, standard deviation and statistical ranking for the experimental groups were: (YZ) 2.38 ± 0.44b; (IZ) 2.92 ± 0.67ab; (AL) 3.43 ± 0.84a. AL group showed the highest ΔE and ΔL mean values. IZ showed an intermediate ΔE value and statistically similar to AL and YZ groups. There was no significant difference between ΔL values for YZ and IZ groups. CONCLUSION:  Although the color difference between all experimental groups and the porcelain shade selected to veneer the restorations could be visually detected (ΔE>1.0), only AL showed a difference above the clinical threshold (ΔE>3.0). Thus, the first study hypothesis was partially accepted. In addition, the type of framework ceramic influenced the final restoration color, accepting the second study hypothesis.

scholarly journals Evaluation of zirconia bonding to veneering porcelain

2014 ◽  
Vol 60 (02) ◽  
pp. 51-56 ◽  
Author(s):  
Aneta Mijoska ◽  
Mirjana Popovska
Keyword(s):  
Zirconium Dioxide ◽  
Adhesive Bonding ◽  
High Strength ◽  
Dental Tissues ◽  
Dental Crowns ◽  
Standard Procedures ◽  
All Ceramic ◽  
Hard Dental Tissues ◽  
Ceramic Restorations

Zirconium dioxide as core ceramic material for dental crowns and bridges, possess high strength, chemical stability and superior aesthetics after veneering. Veneering ceramic is considered to be the weakest part of all-ceramic restorations. The adhesion between the core and veneering porcelain is based on the manner in which the connection occurs in metal-ceramic structures. Standard procedures for connecting zirconia to hard dental tissues and veneering materials do not achieve the required strength of bonding. The aim of the paper is to investigate different surface treatments of the zirconium dioxide ceramic core and find the best, for achieving highest adhesive bonding values to veneering porcelain. The study was primarily designed to investigate the bonding strength of the veneering porcelain to zirconia with in vitro Macro shear bond strength test. The specimens with different surface treatment of the zirconia were divided in five groups of twelve according to the treatment of zirconium surface and results showed highest bonding values for specimens treated with Rocatec system.

scholarly journals Evaluation of wear characteristics of natural teeth opposing all-ceramic restorations: An in vitro study

2018 ◽  
Vol 4 (3e) ◽  
pp. 287-292
Author(s):  
Jayasree Komala ◽  
Sudhakar Reddy T ◽  
Subhasri Kandhati ◽  
Keerthi Edulapalli
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Wear Characteristics ◽  
All Ceramic ◽  
Natural Teeth ◽  
Ceramic Restorations

Effect of In Vitro Ageing on a Cold Isostatic-Pressed Zirconia Ceramic for All Ceramic Restorations

2011 ◽  
Vol 493-494 ◽  
pp. 604-608
Author(s):  
A. Vatali ◽  
E. Siarampi ◽  
Eleana Kontonasaki ◽  
Nikolaos Kantiranis ◽  
T. Zorba ◽  
...  
Keyword(s):  
Clinical Performance ◽  
Tetragonal Zirconia ◽  
Surface Profile ◽  
Zirconia Ceramic ◽  
Full Density ◽  
Zirconia Ceramics ◽  
All Ceramic ◽  
M Phase ◽  
Ceramic Restorations

High strength of Yttria stabilized tetragonal zirconia polycrystal (Y-TZP) zirconia ceramics are sensitive to low temperature degradation (LTD) that leads to exaggerated tetragonal to monoclinic transformation and a surface to depth propagating degradation that diminishes their mechanical properties. In vitro tests for accelerating ageing have been proposed for the prediction of zirconia ceramics clinical performance. The aim of the present work was to investigate the in vitro ageing of a cold isostatic-pressed zirconia ceramic for all ceramic restorations. Bar-shaped specimens milled from a zirconia block (Ivoclar IPS e.max ZirCAD) were sintered to full density, mirror-polished and cut into two equal pieces. One piece was used as control while the other was subsequently aged (steam 134°C / 2 bars / 10 hours). Atomic Force Microscopy (AFM) was used to evaluate the surface profile and the micro-structural features before and after ageing. Fourier Transform Infrared Spectroscopy (FTIR) and X-Ray Diffraction Analysis (XRD) were used to determine the degree of the m-ZrO2 transformation. Ageing resulted in an increase of the surface roughness, while the formation of monoclinic spots on the surface of the specimens was verified by surface uplifts in the AFM images. The peaks of the m-phase were clearly observed in the FTIR spectra while an average increase of 16% w.t. of the m-ZrO2 phase was recorded by XRD. Although, no sound lifetime predictions can be made from accelerated tests, based on the ISO standard that imposes that the m-phase should not exceed 25% wt after 5h at 134 °C and 2 bar pressure, it can be concluded that the tested ceramic resisted an extreme transformation that could negatively affect its clinical performance.

Importance of the Meshing Accuracy for Stress Evaluation in All-Ceramic Restored Teeth

2013 ◽  
Vol 404 ◽  
pp. 112-117
Author(s):  
Sorin Porojan ◽  
Florin Topală ◽  
Liliana Porojan
Keyword(s):  
Finite Element ◽  
Design Method ◽  
In Vitro Study ◽  
Material Behavior ◽  
Element Analysis ◽  
All Ceramic ◽  
Distribution Of Stress ◽  
Ceramic Restorations

The fracture resistance of all-ceramic restorations is one of the major concerns in clinical applications of these materials. An in vitro study can help to estimate the in vivo behavior of a new dental material and design method. The FEM (finite element method) seems to be a proper tool to study material behavior in relation to their composition, relationship and geometry, by analyzing the distribution of stress. The purpose of this study was to evaluate, by finite element analysis, the importance of meshing accuracy on stresses induced in all-ceramic restored teeth during protrusion loading. For the experimental analysis, a 3D model of a central incisor was achieved: intact teeth, unrestored teeth with chamfer marginal preparation, the same tooth restored with full pressed ceramic crown. Stress analysis was performed on the restored incisor during protrusion. To evaluate the importance of the meshing accuracy for stresses in all-ceramic restored teeth three kinds of meshing options were chosen: coarse, medium and fine. For the analysis choosing of the proper meshing options is essential for accurate results. The medium meshing is enough to obtain favorable results.

scholarly journals Effect of the framework material on the final color of all-ceramic restorations

2011 ◽  
Vol 27 ◽  
pp. e83
Author(s):  
Q.N. Sonza ◽  
T.K. Vendruscolo ◽  
M. Borba
Keyword(s):  
All Ceramic ◽  
Ceramic Restorations ◽  
Final Color
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