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VOLUME 14 , ISSUE 8 ( August, 2023 ) > List of Articles

ORIGINAL RESEARCH

A Study of the Antagonist Tooth Wear, Hardness, and Fracture Toughness of Three Different Generations of Zirconia

Abid S Khan, Taufique Shaikh, Mosin Shaikh, Quraish Lal

Keywords : Fracture toughness, Hardness, Translucent zirconia, Three generations of zirconia, Wear

Citation Information : Khan AS, Shaikh T, Shaikh M, Lal Q. A Study of the Antagonist Tooth Wear, Hardness, and Fracture Toughness of Three Different Generations of Zirconia. World J Dent 2023; 14 (8):688-695.

DOI: 10.5005/jp-journals-10015-2276

License: CC BY-NC 4.0

Published Online: 20-09-2023

Copyright Statement:  Copyright © 2023; The Author(s).


Abstract

Aim: The objective of this study was to evaluate the wear of opposing natural teeth, hardness, and fracture toughness of all three generations of zirconia. Materials and methods: Three groups were divided based on the generation of zirconia (n = 12): groups I (first generation of zirconia), II (second generation of zirconia), and III (third generation of zirconia). Wear of opposing tooth: the discs and extracted human premolars were placed onto holders on a two-body wear machine under a constant load of 5 kg. Hardness was calculated using Vicker's microhardness tester, Reichert Austria Make. International Organization for Standardization (ISO) standardized chart was used to check the hardness number based on the indentation length. Fracture toughness was calculated using Niihara's formula. Results: Statistical analysis was done using paired t-test and one-way analysis of variance (ANOVA). The maximum amount of wear was seen with the first generation of translucent zirconia—group I (0.93 mm) followed by group II and III (0.76 and 0.22 mm, respectively). Hardness and fracture toughness value from highest to lowest was in the following order group I > group II > group III. Conclusion: Within the limitations of this in vitro study, it can be concluded that the third generation of zirconia (group III) showed the least amount of wear of a natural opposing tooth, hardness, and fracture toughness values among all three generations of zirconia. Clinical significance: Around 5% of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) monolithic translucent zirconia is clinically significant in anterior aesthetic restorations since it is superior to glass ceramics in terms of mechanical properties and is almost similar in terms of translucency. Good esthetic results can also be achieved in the posterior region with minimal occlusal reduction. Also, monolithic translucent zirconia (third generation of zirconia) abrades the antagonist dentition less than other esthetic ceramics.

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