Effect of water content on the flexural strength during refiring in dental porcelain / 대한치과보철학회지
The Journal of Korean Academy of Prosthodontics
;
: 656-673, 2003.
Article
in Korean
| WPRIM
| ID: wpr-207699
ABSTRACT
STATEMENT OF PROBLEM:
Long-term exposure of dental porcelain to saliva during temporary cementation of a porcelain-fused to metal (PFM) restoration could affect mechanical strength of dental porcelain if the restoration is refired.PURPOSE:
This work was performed to verify the effect of water on the mechanical strength in aged dental porcelain. MATERIAL ANDMETHOD:
63 specimens(Vintage Metalbond opaque and opal powder) were distributed to three experimental groups; non-water immersed control, immersed and pedried, and immersed and non-predired groups. The changes in flexural strength and fracture toughness after specimen refiring related to Fourier Transform Infrared (FT-IR) spectroscopy.RESULTS:
1. The FT-IR reflectances assigned to molecular bonds of H2O were noted as significantly different between the first-fired group and three refired groups and between two water-immersed groups and control group after refiring( p<0.05). They were also significantly different between predried group and non-predried group after refiring( p<0.05). 2. For opal specimens, FT-IR absorbances for hydrogen bond of H2O and silanols were significantly higher in non-predried group than in predreid group( p<0.05). 3. Predried opal group showed the highest mean flexural strength( p<0.05). Non-predried group indicated higher mean flexural strength than control group( p<0.05). 4. The mean fracture toughness for predired group was higher than non-predried group( p<0.05). 5. The difference of leucite crystal size is noted between control group and water-immersed, predried group in scanning electron microscopic study(x10000).
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Saliva
/
Spectrum Analysis
/
Water
/
Cementation
/
Dental Porcelain
/
Fourier Analysis
/
Hydrogen
Language:
Korean
Journal:
The Journal of Korean Academy of Prosthodontics
Year:
2003
Type:
Article
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