Impact Of Simulated Gastric Acid On Color Stability Of Different Types Of Dental Ceramics

Document Type : Original Article

Authors

1 Assistant Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Tanta University

2 Professor of Fixed Prosthodontics, Faculty of Dentistry Tanta University

3 Assistant Professor of Fixed Prosthodontics, Faculty of Dentistry, Tanta University

Abstract

Purpose: The purpose of this in vitro study was to evaluate the impact of simulated gastric acidity on color stability of different types of dental ceramics.
Materials and Methods: Fifty specimens were constructed according to type of the material into five groups (n=10), as follows: Partially stabilized zirconia (PSZ) (Prettaue),Fully stabilized zirconia (FSZ) (Prettaue Anterior), lithium disilicate ceramics (IPS. Emax), Zirconia-containing lithium silicate ceramics (ZLS) (Vita Suprinity) and Hybrid ceramics (Vita Enamic). All specimens were cut with a low-speed diamond saw (Isomet) into a rectangular shape with the following dimension: 12mm width x 14mm length x 1 mm thickness. Color stability was evaluated by reflective spectrophotometer. Each specimen was immersed in 5 ml of the simulated acid of ph 1.2 for 96 h in a37◦C incubator. One-way ANOVA was used to compare mean difference between groups.
Results: There was highly significant difference (P=0.000) between all groups. Prettaue group showed the least amount of color change (2.97±1.27), while vita enamic group showed the highest color change (5.97±3.29).
Conclusions: The gastric acid changed the color of all types of dental ceramics. Except for Partially stabilized zirconia and lithium disilicate ceramics, the color change of all other ceramics was noticeable to the human eye and then was clinically unacceptable.

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Egyptian Dental Journal
Volume 68, Issue 2 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
April 2022
Pages 1767-1773

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