Variations in Ceramic Thickness: Part 2. Controlling Shade with Non-uniform Tooth Reduction

2013 ◽  
Vol 3 (3) ◽  
pp. 210-214
Author(s):  
Stephen J. Chu ◽  
Adam J. Mieleszko
Keyword(s):  
Ceramic Thickness

Influence of feldspar ceramic thickness on the properties of resin cements and restorative set

2021 ◽  
Author(s):  
Fernanda Brombila Blumentritt ◽  
Geórgia Cancian ◽  
Júlia Machado Saporiti ◽  
Thiago Azario Holanda ◽  
Fabíola Jardim Barbon ◽  
...  
Keyword(s):  
Resin Cements ◽  
Ceramic Thickness

scholarly journals LED and Halogen Light Transmission through a CAD/CAM Lithium Disilicate Glass-Ceramic

2015 ◽  
Vol 26 (6) ◽  
pp. 648-653 ◽  
Author(s):  
Carolina Nemesio de Barros Pereira ◽  
Cláudia Silami de Magalhães ◽  
Bruno Daleprane ◽  
Rogéli Tibúrcio Ribeiro da Cunha Peixoto ◽  
Raquel da Conceição Ferreira ◽  
...  
Keyword(s):  
Regression Model ◽  
Glass Ceramic ◽  
Light Transmission ◽  
Light Attenuation ◽  
Lithium Disilicate ◽  
Strong Negative Correlation ◽  
Halogen Light ◽  
Significant Difference ◽  
Cad Cam ◽  
Ceramic Thickness

The effect of thickness, shade and translucency of CAD/CAM lithium disilicate glass-ceramic on light transmission of light-emitting diode (LED) and quartz-tungsten-halogen units (QTH) were evaluated. Ceramic IPS e.max CAD shades A1, A2, A3, A3.5, high (HT) and low (LT) translucency were cut (1, 2, 3, 4 and 5 mm). Light sources emission spectra were determined. Light intensity incident and transmitted through each ceramic sample was measured to determine light transmission percentage (TP). Statistical analysis used a linear regression model. There was significant interaction between light source and ceramic translucency (p=0.008) and strong negative correlation (R=-0.845, p<0.001) between ceramic thickness and TP. Increasing one unit in thickness led to 3.17 reduction in TP. There was no significant difference in TP (p=0.124) between shades A1 (ß1=0) and A2 (ß1=-0.45) but significant reduction occurred for A3 (ß1=-0.83) and A3.5 (ß1=-2.18). The interaction QTH/HT provided higher TP (ß1=0) than LED/HT (ß1=-2.92), QTH/LT (ß1=-3.75) and LED/LT (ß1=-5.58). Light transmission was more effective using halogen source and high-translucency ceramics, decreased as the ceramic thickness increased and was higher for the lighter shades, A1 and A2. From the regression model (R2=0.85), an equation was obtained to estimate TP value using each variable ß1 found. A maximum TP of 25% for QTH and 20% for LED was found, suggesting that ceramic light attenuation could compromise light cured and dual cure resin cements polymerization.

The effect of ceramic thickness and number of firings on the color of two all-ceramic systems

2008 ◽  
Vol 100 (2) ◽  
pp. 99-106 ◽  
Author(s):  
Ozge Ozturk ◽  
Bulent Uludag ◽  
Aslihan Usumez ◽  
Volkan Sahin ◽  
Gozde Celik
Keyword(s):  
All Ceramic ◽  
Ceramic Thickness

scholarly journals Effects of substrate, ceramic thickness, translucency, and cement shade on the color of CAD/CAM lithium‐disilicate crowns

2019 ◽  
Vol 31 (5) ◽  
pp. 457-464 ◽  
Author(s):  
Alexandra Czigola ◽  
Emese Abram ◽  
Zoltan I. Kovacs ◽  
Krisztina Marton ◽  
Peter Hermann ◽  
...  
Keyword(s):  
Lithium Disilicate ◽  
Cad Cam ◽  
Ceramic Thickness

Influence of the Feldspathic Ceramic Thickness and Shade on the Microhardness of Dual Resin Cement

10.2341/05-51 ◽  
2006 ◽  
Vol 31 (3) ◽  
pp. 384-389 ◽  
Author(s):  
C. J. Soares ◽  
N. R. Silva ◽  
R. B. Fonseca
Keyword(s):  
Clinical Relevance ◽  
Resin Cement ◽  
Resin Cements ◽  
Ceramic Thickness ◽  
Ceramic Restorations

Clinical Relevance Polymerization of dual resin cements is significantly more affected by thickness of feldspathic ceramic restorations than by shade.

scholarly journals Relationship between Rheological Behaviour and Final Structure ofAl2O3and YSZ Foams Produced by Replica

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
S. Y. Gómez ◽  
O. A. Alvarez ◽  
J. A. Escobar ◽  
J. B. Rodrigues Neto ◽  
C. R. Rambo ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Raw Materials ◽  
Rheological Behaviour ◽  
Rheological Parameters ◽  
Ceramic Structure ◽  
Ceramic Foams ◽  
Different Types ◽  
Binder Type ◽  
Ceramic Suspensions ◽  
Ceramic Thickness

Using rheological parameters of ceramic suspensions, it is possible to taylor the structure of the ceramic foams produced by replica. This method consists in the impregnation of a polymeric flexible template (polyurethane foam) with a ceramic suspension (slurry) containing the appropriate additives, followed by burning out organic compounds and additives and sintering the ceramic structure. In this work, ceramic foams were produced by the replica method from Al2O3and 3% Y2O3-ZrO2. Rheological parameters of the ceramic suspensions were investigated to improve the mechanical performance of final structures. Different types and quantities of raw materials were combined in order to select the formulations for ceramic foams. The parameters that have a significant influence on the process are the binder type and the amount of solids. Significant changes on the hysteresis area of the suspensions resulted in a lower density of macrodefects in the material. Likewise, when the shear rate viscosity is enhanced, the thickness of the struts increased proportionally. Lastly, when the hysteresis area magnitude and the ceramic thickness increased, the material with higher uniformity was internally densified, and the stress concentration of the internal defects was smoothed

Influence of ceramic thickness on the polymerization of light-cured resin cement

1990 ◽  
Vol 63 (3) ◽  
pp. 295-300 ◽  
Author(s):  
R. Blackman ◽  
N. Barghi ◽  
E. Duke
Keyword(s):  
Resin Cement ◽  
Ceramic Thickness

Masking Colored Substrates Using Monolithic and Bilayer CAD-CAM Ceramic Structures

2017 ◽  
Vol 42 (4) ◽  
pp. 387-395 ◽  
Author(s):  
GR Basso ◽  
AB Kodama ◽  
AH Pimentel ◽  
MR Kaizer ◽  
A Della Bona ◽  
...  
Keyword(s):  
Confidence Intervals ◽  
Pearson Correlation ◽  
Lithium Disilicate ◽  
Color Difference ◽  
Color Variation ◽  
Color Coordinates ◽  
Cad Cam ◽  
Ceramic Thickness ◽  
Monolithic Structures ◽  
Monolithic Structure

SUMMARY Objective: To evaluate the masking ability and translucency of monolithic and bilayer CAD-CAM ceramic structures. Methods: Discs of high translucency (HT) and low translucency (LT) lithium disilicate–based ceramic (IPS e.max CAD) with different thicknesses (0.7, 1, 1.5, and 2 mm) were evaluated as a monolithic structure or combined (bilayer) with a 0.5-mm-thick zirconia framework (IPS e.max ZirCAD). The masking ability and translucency were calculated based on CIE L*a*b* color coordinates measured with a spectrophotometer (SP60, X-Rite). The translucency parameter (TP) was calculated using color coordinates measured over standard white-and-black backgrounds. The masking ability was calculated by CIEDE2000 color difference metric (ΔE00) for each specimen measured over a tooth-colored substrate (shade A2) compared to three darker backgrounds (shade C4 and two metal substrates). Confidence intervals (CI) for the means (95% CI) were calculated for TP and ΔE00. The Pearson correlation between ΔE00 and TP was investigated for monolithic and bilayer structures over all backgrounds. Results: The thinner the lithium disilicate layer, the greater the translucency and the higher the ΔE00 values. The effect of ceramic thickness on both translucency and masking ability was more pronounced for the monolithic structures. In addition, monolayers always presented a greater color variation than their bilayer counterparts. The metallic background produced greater ΔE00 than the C4-shaded substrate. Conclusion: Monolithic veneers were able to mask C4-shaded background but did not mask metallic backgrounds. Bilayer structures showed greater shade masking ability than monolithic structures.

scholarly journals Effect of Different Thicknesses of Pressable Ceramic Veneers on Polymerization of Light-cured and Dual-cured Resin Cements

2015 ◽  
Vol 16 (5) ◽  
pp. 347-352 ◽  
Author(s):  
Seok-Hwan Cho ◽  
Arnaldo Lopez ◽  
David W Berzins ◽  
Soni Prasad ◽  
Kwang Woo Ahn
Keyword(s):  
Light Intensity ◽  
Vickers Microhardness ◽  
Storage Period ◽  
Degree Of Conversion ◽  
Resin Cement ◽  
Cement Type ◽  
Resin Cements ◽  
Significant Difference ◽  
Ceramic Disk ◽  
Ceramic Thickness

ABSTRACT Aim This study evaluated the effects of ceramic veneer thicknesses on the polymerization of two different resin cements. Materials and methods A total of 80 ceramic veneer disks were fabricated by using a pressable ceramic material (e.max Press; Ivoclar Vivadent) from a Low Translucency (LT) ingot (A1 shade). These disks were divided into light-cured (LC; NX3 Nexus LC; Kerr) and dual-cured (DC; NX3 Nexus DC; Kerr) and each group was further divided into four subgroups, based on ceramic disk thickness (0.3, 0.6, 0.9, and 1.2 mm). The values of Vickers microhardness (MH) and degree of conversion (DOC) were obtained for each specimen after a 24-hour storage period. Association between ceramic thickness, resin cement type, and light intensity readings (mW/cm2) with respect to microhardness and degree of conversion was statistically evaluated by using analysis of variance (ANOVA). Results For the DOC values, there was no significant difference observed among the LC resin cement subgroups, except in the 1.2 mm subgroup; only the DOC value (14.0 ± 7.4%) of 1.2 mm DC resin cement had significantly difference from that value (28.9 ± 7.5%) of 1.2 mm LC resin cement (p < 0.05). For the MH values between LC and DC resin cement groups, there was statistically significant difference (p < 0.05); overall, the MH values of LC resin cement groups demonstrated higher values than DC resin cement groups. On the other hands, among the DC resin cement subgroups, the MH values of 1.2 mm DC subgroup was significantly lower than the 0.3 mm and 0.6 mm subgroups (p < 0.05). However, among the LC subgroups, there was no statistically significant difference among them (p > 0.05). Conclusion The degree of conversion and hardness of the resin cement was unaffected with veneering thicknesses between 0.3 and 0.9 mm. However, the DC resin cement group resulted in a significantly lower DOC and MH values for the 1.2 mm subgroup. Clinical Significance While clinically adequate polymerization of LC resin cement can be achieved with a maximum 1.2 mm of porcelain veneer restoration, the increase of curing time or light intensity is clinically needed for DC resin cements at the thickness of more than 0.9 mm. How to cite this article Cho S-H, Lopez A, Berzins DW, Prasad S, Ahn KW. Effect of Different Thicknesses of Pressable Ceramic Veneers on Polymerization of Lightcured and Dual-cured Resin Cements. J Contemp Dent Pract 2015;16(5):347-352.

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