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Impact of thermal misfit on shear strength of veneering ceramic/zirconia composites


Fischer, J; Stawarczyk, B; Trottmann, A; Hämmerle, C H F (2009). Impact of thermal misfit on shear strength of veneering ceramic/zirconia composites. Dental Materials, 25(4):419-423.

Abstract

OBJECTIVES: Thermal misfit is discussed as one reason for chipping of veneered zirconia restorations. The aim of the investigation was to assess the effect of thermal misfit on the shear strength of zirconia/veneering ceramic composites. METHODS: Shear strengths of 12 different veneering ceramic/zirconia composites were measured (n=10). The veneering ceramics were fired onto polished Y-TZP. In order to create a strong thermal mismatch, one of the veneering ceramics was intended for use on alumina and one for the metal-ceramic technique. The glass transition temperatures of the veneering ceramics and the coefficients of thermal expansion of all ceramics were measured (n=6). Statistical analysis was performed with one-way ANOVA and a post hoc Bonferroni test (p<0.05). RESULTS: Shear strength ranged from 21.9+/-6.2 to 31.0+/-7.1MPa. The ceramic for the metal-ceramic technique showed spontaneous debonding. The differences in the coefficients of thermal expansion of core and veneer (Deltaalpha) were calculated. In addition the differences between glass transition temperatures of the veneering ceramics and room temperature (DeltaT) as the effective temperature range for stress formation were calculated. Highest shear strength was observed when DeltaalphaDeltaT approximately 1000x10(-6). CONCLUSIONS: Thermal expansion and glass transition temperature of the veneering ceramic have an impact on the shear strength of veneer/zirconia composites.

Abstract

OBJECTIVES: Thermal misfit is discussed as one reason for chipping of veneered zirconia restorations. The aim of the investigation was to assess the effect of thermal misfit on the shear strength of zirconia/veneering ceramic composites. METHODS: Shear strengths of 12 different veneering ceramic/zirconia composites were measured (n=10). The veneering ceramics were fired onto polished Y-TZP. In order to create a strong thermal mismatch, one of the veneering ceramics was intended for use on alumina and one for the metal-ceramic technique. The glass transition temperatures of the veneering ceramics and the coefficients of thermal expansion of all ceramics were measured (n=6). Statistical analysis was performed with one-way ANOVA and a post hoc Bonferroni test (p<0.05). RESULTS: Shear strength ranged from 21.9+/-6.2 to 31.0+/-7.1MPa. The ceramic for the metal-ceramic technique showed spontaneous debonding. The differences in the coefficients of thermal expansion of core and veneer (Deltaalpha) were calculated. In addition the differences between glass transition temperatures of the veneering ceramics and room temperature (DeltaT) as the effective temperature range for stress formation were calculated. Highest shear strength was observed when DeltaalphaDeltaT approximately 1000x10(-6). CONCLUSIONS: Thermal expansion and glass transition temperature of the veneering ceramic have an impact on the shear strength of veneer/zirconia composites.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic for Fixed and Removable Prosthodontics
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:April 2009
Deposited On:28 Jan 2009 18:05
Last Modified:05 Apr 2016 12:54
Publisher:Elsevier
ISSN:0109-5641
Additional Information:The original publication is available at www.springerlink.com. - Der Name des Verfassers B. Stawarczyk wurde im Verlags-PDF fälschlicherweise als B. Stawarzcyk wiedergegeben.
Publisher DOI:https://doi.org/10.1016/j.dental.2008.09.003
PubMed ID:18990436

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