Influences of multiple firings and aging on surface roughness, strength and hardness of veneering ceramics for zirconia frameworks.

Tang, X ; Luo, H ; et al.

In: Journal of dentistry, Jg. 43 (2015-09-01), Heft 9, S. 1148-1153

academicJournal

Objectives: To evaluate the effects of multiple firings and aging on surface roughness, strength, and hardness of veneering ceramics for zirconia frameworks.

Methods: Five different veneering ceramics for zirconia frameworks were used: Vintage ZR (ZR), Cerabien ZR (CZR), VitaVM9 (VM9), Cercon ceram KISS (KISS), and IPS e.max ceram (e.max). Specimens were fired 2 or 10 times in order to accelerate aging. Surface roughness was evaluated using laser profilometry. Flexural strength and Vickers hardness were also measured. Surface topography was observed using scanning electron microscopy.

Results: After accelerated aging, the surface roughness of all specimens fired 10 times was significantly lower than that of the same specimens fired 2 times (P=0.000). Except for VM9, the flexural strength of all specimens fired 10 times was greater than that of the same specimens fired 2 times, and the differences were significant for ZR and CZR (P<0.01). The flexural strength of VM9 fired 10 times was significantly lower than that of VM9 fired 2 times (P=0.034). The Vickers hardness of ZR and VM9 fired 10 times was significantly higher than that of the same specimens fired 2 times (P<0.05), but that of KISS fired 10 times was significantly lower than that of KISS fired 2 times (P=0.000).

Conclusions: Multiple firings had a positive effect on the surface roughness of all aged veneering ceramics used for zirconia restorations and on the strength and hardness of many aged veneering ceramics used for zirconia restorations.

Titel:	Influences of multiple firings and aging on surface roughness, strength and hardness of veneering ceramics for zirconia frameworks.
Autor/in / Beteiligte Person:	Tang, X ; Luo, H ; Bai, Y ; Tang, H ; Nakamura, T ; Yatani, H
Zeitschrift:	Journal of dentistry, Jg. 43 (2015-09-01), Heft 9, S. 1148-1153
Veröffentlichung:	Kidlington : Elsevier ; <i>Original Publication</i>: Bristol, Eng., Wright., 2015
Medientyp:	academicJournal
ISSN:	1879-176X (electronic)
DOI:	10.1016/j.jdent.2015.06.006
Schlagwort:	Hardness Materials Testing Microscopy, Electron, Scanning Pliability Surface Properties Time Factors Dental Porcelain chemistry Dental Veneers Hot Temperature Zirconium chemistry
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Evaluation Study; Journal Article; Research Support, Non-U.S. Gov't Language: English [J Dent] 2015 Sep; Vol. 43 (9), pp. 1148-1153. <i>Date of Electronic Publication: </i>2015 Jun 25. MeSH Terms: Dental Porcelain* / chemistry ; Dental Veneers* ; Hot Temperature* ; Zirconium* / chemistry ; Hardness ; Materials Testing ; Microscopy, Electron, Scanning ; Pliability ; Surface Properties ; Time Factors Contributed Indexing: Keywords: Accelerated aging; Flexural strength; Multiple firings; Surface roughness; Veneering ceramics; Vickers hardness Substance Nomenclature: 12001-21-7 (Dental Porcelain) ; C6V6S92N3C (Zirconium) ; S38N85C5G0 (zirconium oxide) Entry Date(s): Date Created: 20150628 Date Completed: 20170124 Latest Revision: 20191210 Update Code: 20231215

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