الفهرس 
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Abstract
The purpose of this in-vitro research was to examine the impact of time on the surface roughness and colour stability of two CAD/CAM glass-ceramics (in-vivo study).
In this investigation, we will use two distinct varieties of glass ceramic CAD/CAM blocks. Using CAD/CAM technology, the crowns will be machined per the guidelines provided by the crown’s maker.
Clustering: 16 samples will be built, then split into two groups based on the glass ceramic material used (8 samples each).
As part of the analysis, the CIELAB colour coordinates of each sample will be measured both before and after ageing using a dental spectrophotometer.
Each sample will have its surface roughness evaluated both before and after age.
EXPERIMENTAL (IN-THE-WILD):
All participants in this research will sign an informed consent form that includes the information in this document on the procedures and testing dates.
Twenty patients who have had endodontic treatment on their central incisors will be split in halves (ten each) to get crowns made from either metal-reinforced ceramic or glass ceramic CAD/CAM machines.
EasyShade spectrophotometer readings will be taken of each crowned tooth’s colour immediately after cementation, and then again after 3, 6, and 9 months.
There was no statistically significant difference in colour retention after ageing and staining between the suprinity and e max groups. Furthermore, there was no statistically significant difference between the two ceramic groups in terms of in-vivo colour stability. Similarly, the ageing and staining processes leave their marks on ceramic materials.
As can be seen from the data, there is no discernible difference in surface roughness between the two ceramics CAD/CAM materials.