EFFECT OF CORROSION ON COLOR CHANGE AND FLEXURAL STRENGTH OF TWO RECENT HIGH TRANSLUCENT ZIRCONIA CERAMICS

Document Type : Original Article

Authors

1 B.D.S. (2016) Faculty of Dentistry Nahda University

2 Professor & Chairman of Fixed Prosthodontics, Faculty of Dentistry Minia University

3 Lecturer of Fixed Prosthodontics, Faculty of Dentistry Minia University

Abstract

Objective:
evaluate the effects of corrosion on flexural strength and color of the two translucent zirconia materials in comparison to a monochromatic zirconia and Lithium disilicate Glass Ceramic.
Materials and Methods:
100 disc-shaped specimens were created. The samples were split into four major groups (n = 10) for (BruxZir) (Z) group and IPS e.max CAD HT (E) group, and (n = 40) f (Kathana STML (S) group and Katana UTML (U) group). According to the number of layers in multi-layered ceramic materials, Katana STML (S) groups and Katana UTML (U) groups were separated into four subgroups (n = 10). Each subgroup was subsequently separated into two groups (n = 5) based on the degree of corrosion, with the first class receiving corrosion treatment and the second class serving as a control group that did not receive corrosion treatment. After a spectrophotometer was used to determine the color , the same specimens underwent a bi-axial flexural strength test.
Results:
For all materials of the highest value assessed for the Katana STML and Katana UTML, corrosion resulted in a considerable weight loss. Compared to other materials, corrosion changed the hue of Katana STML and Katana UTML in a clinically undesirable way. The biaxial flexural strength of BruxZir significantly increased due to corrosion
Compared to other studied ceramics, Katana STML and Katana UTML both had significant weight loss and color change. Both Katana STML and Katana UTML ranked between BruxZir and IPS e.max CAD in terms of flexural strength. Only BruxZir were corroded.

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Egyptian Dental Journal
Volume 69, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2023
Pages 2971-2979

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