Evaluation of color change in CAD-On restorations using different core/veneer thickness ratios and different veneer translucencies

Wahba, Mennatallah; El-Etreby, Amr; Morsi, Tarek Salah

doi:10.1016/j.fdj.2017.09.002

Cited by 2 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Through the aforementioned results, it was clear that an increase in framework material thickness together with decreasing the thickness of the IPS e.max CAD would lead to decreased translucency as well as an increase in the color difference compared to the A2 shade tab color parameters. Such results reveal an intertwining relationship between both translucency and color which has been consistent with previous studies (25,(30)(31)(32)34) . Fahmy A et al (33) in one past research showed that the amount of color difference between a restoration and the selected shade increased when the thickness of the veneering material decreased.…”

Section: Discussionsupporting

confidence: 93%

“…In bilayered restorations, both the framework material as well as the overlying veneer affect the color match as well as the translucency of the final restoration. (22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34) . However, through literature, there has been a debate regarding the perceptible and acceptable thresholds for color difference where the perceptibility threshold denotes a limit for the color difference identified by an expert clinician while the acceptability threshold points to the amount of color difference detected by an untrained observer (35)(36)(37) .…”

Section: Consequentlymentioning

confidence: 99%

See 1 more Smart Citation

Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers

Wahba

Morsi

2023

Egyptian Dental Journal

View full text Add to dashboard Cite

Objective: To assess the influence of changing the thickness ratio between the framework material which was either 3-YTZP or PEEK, and the veneering milled lithium disilicate on color difference and translucency parameter of bilayered restorations. Materials and Methods:Sixty disc-shaped specimens composed of partially stabilized tetragonal nano-crystalline zirconia or PEEK veneered with milled lithium disilicate (IPS e.max CAD) were randomly divided into two groups (n=30) according to the framework material implemented. Each group was split into 3 subgroups based on the thickness ratio between the framework and the overlying lithium disilicate. The thickness ratios of the framework to the lithium disilicate (T FM : T VLD ) were 0.5mm:1mm, 0.7mm:0.8mm, and 1mm:0.5mm. Color difference (∆E) and translucency parameter (TP) of all specimens were measured using a laboratory spectrophotometer.Results: Two-way ANOVA results showed that the type of framework, the thickness ratio, and the interaction between both variables, had a significant effect (p<0.001) on (∆E). T FM : T VLD =0.5mm:1mm subgroup showed the lowest (∆E) values in both groups. For (TP), two-way ANOVA results showed that only the framework material and thickness ratio had a significant effect (p<0.001) on (TP). (ZIR) group specimens showed statistically significantly (p<0.001) higher (TP) values than (PK) group specimens when all thickness ratios were considered. T FM : T VLD =0.5mm:1mm subgroup in both groups displayed the highest (TP) values. Conclusions:Changing the ratio between the framework thickness and that of IPS e.max CAD had a significant impact on color difference and translucency parameter with both materials in all thickness ratios.

show abstract

Section: Discussionsupporting

confidence: 93%

Section: Consequentlymentioning

confidence: 99%

Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers

Wahba

Morsi

2023

Egyptian Dental Journal

View full text Add to dashboard Cite

show abstract

“…This is reverted to its reliability since it is powered by internal light source based on D-65 illuminant thus the environmental lightening conditions don't influence its color measurements. Relying on large diameter fiber optics arranged in a stainless steel probe that can illuminate the surface and receive light that is internally scattered, it avoids the specular reflected light that contains little or no color information and that can negatively affect the color measurement [19][20][21][22]. During measurements the 5 mm diameter contact probe tip was placed at the center of each specimen from the veneered side.…”

Section: Methodsmentioning

confidence: 99%

The effect of different surface treatments on color and translucency of bilayered translucent nano-crystalline zirconia before and after accelerated aging

Wahba

Sherif

El-Etreby

et al. 2019

BDS

Self Cite

View full text Add to dashboard Cite

Objective: Despite the higher translucency of nano-crystalline Y-TZP than the conventional Y-TZP, it couldn’t be used in the anterior region of the mouth in its fully anatomical form without veneering for better esthetics. This study evaluated the color change (ΔE) and translucency parameter (TP) of the bilayered nano-crystalline zirconia restorations after different treatments of the zirconia surface before and after accelerated aging. Material and Methods: Forty samples of inCoris TZI were cut in the form of discs 15 mm (diameter) and 1mm (thickness) so that after sintering each disc dimensions’ would be 12 mm (diameter) and 0.8 mm (thickness). All discs were colored by dipping in aqueous zirconia coloring solution of shade A2, then divided into four groups according to the type of surface treatment received before sintering; being tribochemical silica coating, zirconia powder deposition, glass grading, and a control untreated group. After sintering, all discs were veneered with a layer of porcelain 0.7 mm (thickness) and 12 mm (diameter). (ΔE) and TP were measured using VITA Easyshade Compact spectrophotometer before and after accelerated autoclave aging. Results: Different surface treatments applied had significant effect (P<0.05) over ΔE and TP. Glass graded group showed the highest ΔE value and the least TP value among both un-aged and aged sub-groups. Conclusion: Different surface treatments applied affected the color and translucency negatively where the control untreated group showed the highest TP and the least color deviation from the A2 color parameters. On the other hand, accelerated autoclave aging had no effect over translucency or color.KeywordsAging; Ceramic restoration; Color; Translucent.

show abstract

Evaluation of color change in CAD-On restorations using different core/veneer thickness ratios and different veneer translucencies

Cited by 2 publications

References 17 publications

Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers

Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers

The effect of different surface treatments on color and translucency of bilayered translucent nano-crystalline zirconia before and after accelerated aging

Contact Info

Product

Resources

About