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, Pages 2103-2113 PDF (561.71 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/edj.2023.203503.2505 | ||
| Authors | ||
| Mennatallah Mohie Wahba* 1; Tarek Salah Morsi2 | ||
| 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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