Wear Potential of Dental Ceramics and its Relationship with Microhardness and Coefficient of Friction
Purpose To evaluate, by means of pin‐on‐disk testing, the wear potential of different dental ceramic systems as it relates to friction parameters, surface finish, and microhardness. Materials and methods Three groups of different ceramic systems (Noritake EX3, Eris, Empress II) with 20 disks each (1...
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| Published in: | Journal of prosthodontics Vol. 25; no. 7; pp. 557 - 562 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
United States
Blackwell Publishing Ltd
01-10-2016
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Purpose
To evaluate, by means of pin‐on‐disk testing, the wear potential of different dental ceramic systems as it relates to friction parameters, surface finish, and microhardness.
Materials and methods
Three groups of different ceramic systems (Noritake EX3, Eris, Empress II) with 20 disks each (10 glazed, 10 polished) were used. Vickers microhardness (Hv) was determined with a 200‐g load for 30 seconds. Friction coefficients (μ) were determined by pin‐on‐disk testing (5 N load, 600 seconds, and 120 rpm). Wear patterns were assessed by scanning electron microscopy (SEM). The results were analyzed using one‐way ANOVA and Tukey's test, with the significance level set at α = 0.05.
Results
The coefficients of friction were as follows: Noritake EX3 0.28 ± 0.12 (polished), 0.33 ± 0.08 (glazed); Empress II 0.38 ± 0.08 (polished), 0.45 ± 0.05 (glazed); Eris 0.49 ± 0.05 (polished), 0.49 ± 0.06 (glazed). Microhardness measurements were as follows: Noritake EX3 530.7 ± 8.7 (polished), 525.9 ± 6.2 (glazed); Empress II 534.1 ± 8 (polished), 534.7 ± 4.5 (glazed); Eris, 511.7 ± 6.5 (polished), 519.5 ± 4.1 (glazed). The polished and glazed Noritake EX3 and polished and glazed Eris specimens showed statistically different friction coefficients. SEM image analysis revealed more surface changes, such as small cracks and grains peeling off, in glazed ceramics.
Conclusions
Wear potential may be related to the coefficient of friction in Noritake ceramics, which had a lower coefficient than Eris ceramics. Within‐group analysis showed no differences in polished or glazed specimens. The differences observed were not associated with microhardness. |
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| Bibliography: | ark:/67375/WNG-14QTQJ9Q-G ArticleID:JOPR12330 Conselho Nacional de Desenvolvimento Científico e Tecnológico istex:7B7AE08C46D27B1B771A2CF91D54744089A06245 The authors have no conflicts of interest to disclose . This research was partially funded by the Brazilian National Council of Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico ‐ CNPq) ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 1059-941X 1532-849X |
| DOI: | 10.1111/jopr.12330 |