Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers
Wahba, M., Morsi, T. (2023). Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers. EKB Journal Management System, 69(3), 2103-2113. doi: 10.21608/edj.2023.203503.2505
Mennatallah Mohie Wahba; Tarek Salah Morsi. "Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers". EKB Journal Management System, 69, 3, 2023, 2103-2113. doi: 10.21608/edj.2023.203503.2505
Wahba, M., Morsi, T. (2023). 'Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers', EKB Journal Management System, 69(3), pp. 2103-2113. doi: 10.21608/edj.2023.203503.2505
Wahba, M., Morsi, T. Assessing the color difference and translucency of bilayered restorations after varying the framework material and thickness ratio between the framework and veneering layers. EKB Journal Management System, 2023; 69(3): 2103-2113. doi: 10.21608/edj.2023.203503.2505

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

Egyptian Dental Journal
Volume 69, Issue 3, July 2023, Page 2103-2113  XML PDF (561.71 K)
Document Type: Original Article
DOI: 10.21608/edj.2023.203503.2505
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Authors
Mennatallah Mohie Wahba email orcid 1; Tarek Salah Morsiorcid 2
1Lecturer, Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Future University in Egypt
2Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Ain Shams University. Vice Dean Postgraduate Affairs. Faulty of Oral and Dental Medicine. Misr International University in Cairo.
Abstract
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 (TFM: TVLD) 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). TFM: TVLD =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. TFM: TVLD =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.
Keywords
Color; Lithium Disilicate; PEEK; Translucency; Zirconia
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