Effect of Corrosion and Finishing Technique on Micro-hardness and Translucency of Dental Ceramics

Document Type : Original Article

Authors

Lecturer, Fixed Prosthodontics Department, Faculty of Dentistry Assuit University,

Abstract

ABSTRACT
Purpose: This study compared the microhardness and translucency of high transparent monolithic zirconia and lithium disilicate glass ceramic before and after they were subjected to a corrosive media.
Materials and Methods: High Translucent Zirconia (HTZ) from DD BioZx2 A3-HT and Lithium Di-silicate (IPS e.max CAD LT A3, C14) were the two primary ceramic materials used in this investigation, coupled with 4% acetic acid as a corrosive agent. Based on the type of ceramic utilized, 80 ceramic discs (10x12mm) were separated into two groups (40 discs each), and each group was further divided into two subgroups (20 discs each) based on the test that was conducted (VHN and TP). The 20 TP sample discs were then submerged in 4% acetic acid, a corrosive agent, and the VHN subgroup was split into two classes based on the corrosion procedure (10 corroded and 10 not corroded), and the TP subgroup was split into two classes based on the finishing procedure (10 glazed and 10 polished).
Results: The Emax subgroup samples before and after correction showed a statistically significant difference in the microhardness test (VHN) (p=0.027), whereas the HTZ subgroup samples showed no statistically significant difference (p=0.075).
Conclusions: HTZ was not significantly impacted by either corrosion or the finishing technique. In contrast, Emax showed a significant reduction in VHN values due to corrosion, though the finishing technique had no significant effect. HTZ consistently exhibited higher microhardness values both before and after corrosion, while polished Emax samples had the highest translucency parameter (TP) values.

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
July 2025
Pages 2521-2529

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