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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-62922

Stawarczyk, B; Özcan, M; Hallmann, L; Ender, A; Mehl, A; Hämmerle, C H F (2013). The effect of zirconia sintering temperature on flexural strength, grain size, and contrast ratio. Clinical Oral Investigations, 17(1):269-274.

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Abstract

OBJECTIVE: This study investigated the effect of sintering temperatures on flexural strength, contrast ratio, and grain size of zirconia. MATERIALS AND METHODS: Zirconia specimens (Ceramill ZI, Amann Girrbach) were prepared in partially sintered state. Subsequently, the specimens were randomly divided into nine groups and sintered with different final sintering temperatures: 1,300°C, 1,350°C, 1,400°C, 1,450°C, 1,500°C, 1,550°C, 1,600°C, 1,650°C, or 1,700°C with 120 min holding time. Three-point flexural strength (N = 198; n = 22 per group) was measured according to ISO 6872: 2008. The contrast ratio (N = 90; n = 10 per group) was measured according to ISO 2471: 2008. Grain sizes and microstructure of different groups were investigated (N = 9, n = 1 per group) with scanning electron microscope. Data were analyzed using one-way ANOVA with Scheffé test and Weibull statistics (p < 0.05). Pearson correlation coefficient was calculated between either flexural strength or contrast ratio and sintering temperatures. RESULTS: The highest flexural strength was observed in groups sintered between 1,400°C and 1,550°C. The highest Weibull moduli were obtained for zirconia sintered at 1,400°C and the lowest at 1,700°C. The contrast ratio and the grain size were higher with the higher sintering temperature. The microstructure of the specimens sintered above 1,650°C exhibited defects. Sintering temperatures showed a significant negative correlation with both the flexural strength (r = -0.313, p < 0.001) and the contrast ratio values (r = -0.96, p < 0.001). CONCLUSIONS: The results of this study showed that the increase in sintering temperature increased the contrast ratio, but led to a negative impact on the flexural strength. CLINICAL RELEVANCE: Considering the flexural strength values and Weibull moduli, the sintering temperature for the zirconia tested in this study should not exceed 1,550°C.

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic for Preventive Dentistry, Periodontology and Cariology
04 Faculty of Medicine > Center for Dental Medicine > Clinic for Fixed and Removable Prosthodontics
DDC:610 Medicine & health
Language:English
Date:2013
Deposited On:08 Jun 2012 07:46
Last Modified:23 Dec 2013 16:47
Publisher:Springer
ISSN:1432-6981
Additional Information:The original publication is available at www.springerlink.com
Publisher DOI:10.1007/s00784-012-0692-6
PubMed ID:22358379
Citations:Web of Science®. Times Cited: 4
Google Scholar™
Scopus®. Citation Count: 6

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