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- Publisher Website: 10.1016/j.dental.2020.02.002
- Scopus: eid_2-s2.0-85079413844
- PMID: 32063392
- WOS: WOS:000522857800013
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Article: The adverse effects of tungsten carbide grinding on the strength of dental zirconia
Title | The adverse effects of tungsten carbide grinding on the strength of dental zirconia |
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Authors | |
Keywords | ZirconiaPolishing Grinding Dental ceramics Tungsten carbide Surface roughness |
Issue Date | 2020 |
Publisher | Elsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental |
Citation | Dental Materials, 2020, v. 36 n. 4, p. 560-569 How to Cite? |
Abstract | Objectives:
This study investigated the effects of tungsten-carbide grinding on the surface characteristics and mechanical strength of dental 3 mol% yttria-stabilized zirconia (3Y-TZP).
Methods:
Two types of tungsten-carbide burs (TC), 6-blade (TC1) and 8-blade (TC2) were used to grind 3Y-TZP, in a dental air-turbine handpiece with water-cooling and were also subjected to air-particle abrasion (APA): TC1 + APA and TC2 + APA; and rubber polishing (RP): TC1 + RP and TC2 + RP; one group received only rubber-polishing RP. The control group received no treatment. Surface characterization was examined by surface roughness (Ra) and atomic force microscopy. Specimens were also observed with scanning electron microscopy (SEM) and X-ray-diffraction (XRD) for microstructure and crystalline phases. A piston-on-three-balls biaxial-flexural strength (BFS) test was performed with 15 samples-per-group and the broken specimen were observed under SEM to investigate the fracture origin pattern. One-way ANOVA, Kruskal–Wallis test and Weibull analysis were performed at α = 0.05.
Results:
Groups TC1 and TC2 had the lowest mean BFS (p < 0.05) with up to 74 % reduction in strength. APA and RP both significantly increased the mean BFS after tungsten-carbide grinding but was still less than the control (p < 0.05). Compared to the control, the mean BFS was significantly reduced for all groups except for the RP group (p < 0.05). APA and rubber-polishing following TC2 grinding had significant higher mean BFS than those following TC1 grinding respectively (p < 0.05). SEM revealed distinct micro-cracks after tungsten-carbide grinding.
Significance:
Tungsten-carbide burs (6- and 8-blade) are not recommended for zirconia grinding due to the significant reduction of biaxial-flexural strength and observed micro-structural surface and subsurface damage. |
Persistent Identifier | http://hdl.handle.net/10722/283707 |
ISSN | 2021 Impact Factor: 5.687 2020 SCImago Journal Rankings: 1.770 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Wang, Y | - |
dc.contributor.author | Lam, WYH | - |
dc.contributor.author | Luk, HWK | - |
dc.contributor.author | Oilo, M | - |
dc.contributor.author | Shih, K | - |
dc.contributor.author | Botelho, MG | - |
dc.date.accessioned | 2020-07-03T08:22:58Z | - |
dc.date.available | 2020-07-03T08:22:58Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Dental Materials, 2020, v. 36 n. 4, p. 560-569 | - |
dc.identifier.issn | 0109-5641 | - |
dc.identifier.uri | http://hdl.handle.net/10722/283707 | - |
dc.description.abstract | Objectives: This study investigated the effects of tungsten-carbide grinding on the surface characteristics and mechanical strength of dental 3 mol% yttria-stabilized zirconia (3Y-TZP). Methods: Two types of tungsten-carbide burs (TC), 6-blade (TC1) and 8-blade (TC2) were used to grind 3Y-TZP, in a dental air-turbine handpiece with water-cooling and were also subjected to air-particle abrasion (APA): TC1 + APA and TC2 + APA; and rubber polishing (RP): TC1 + RP and TC2 + RP; one group received only rubber-polishing RP. The control group received no treatment. Surface characterization was examined by surface roughness (Ra) and atomic force microscopy. Specimens were also observed with scanning electron microscopy (SEM) and X-ray-diffraction (XRD) for microstructure and crystalline phases. A piston-on-three-balls biaxial-flexural strength (BFS) test was performed with 15 samples-per-group and the broken specimen were observed under SEM to investigate the fracture origin pattern. One-way ANOVA, Kruskal–Wallis test and Weibull analysis were performed at α = 0.05. Results: Groups TC1 and TC2 had the lowest mean BFS (p < 0.05) with up to 74 % reduction in strength. APA and RP both significantly increased the mean BFS after tungsten-carbide grinding but was still less than the control (p < 0.05). Compared to the control, the mean BFS was significantly reduced for all groups except for the RP group (p < 0.05). APA and rubber-polishing following TC2 grinding had significant higher mean BFS than those following TC1 grinding respectively (p < 0.05). SEM revealed distinct micro-cracks after tungsten-carbide grinding. Significance: Tungsten-carbide burs (6- and 8-blade) are not recommended for zirconia grinding due to the significant reduction of biaxial-flexural strength and observed micro-structural surface and subsurface damage. | - |
dc.language | eng | - |
dc.publisher | Elsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental | - |
dc.relation.ispartof | Dental Materials | - |
dc.subject | ZirconiaPolishing | - |
dc.subject | Grinding | - |
dc.subject | Dental ceramics | - |
dc.subject | Tungsten carbide | - |
dc.subject | Surface roughness | - |
dc.title | The adverse effects of tungsten carbide grinding on the strength of dental zirconia | - |
dc.type | Article | - |
dc.identifier.email | Lam, WYH: retlaw@hku.hk | - |
dc.identifier.email | Luk, HWK: wkluka@hkucc.hku.hk | - |
dc.identifier.email | Shih, K: kshih@hku.hk | - |
dc.identifier.email | Botelho, MG: botelho@hkucc.hku.hk | - |
dc.identifier.authority | Lam, WYH=rp02183 | - |
dc.identifier.authority | Luk, HWK=rp00008 | - |
dc.identifier.authority | Shih, K=rp00167 | - |
dc.identifier.authority | Botelho, MG=rp00033 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.dental.2020.02.002 | - |
dc.identifier.pmid | 32063392 | - |
dc.identifier.scopus | eid_2-s2.0-85079413844 | - |
dc.identifier.hkuros | 310662 | - |
dc.identifier.volume | 36 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | 560 | - |
dc.identifier.epage | 569 | - |
dc.identifier.isi | WOS:000522857800013 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0109-5641 | - |