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EFFECT OF WATER CONTENT ON THE FLEXURAL STRENGTH DURING REFIRING IN DENIAL PORCELAIN  

Park Hye-Yang (Dept. of Prosthodontics, Dental College, Yonsei University)
Shim June-Sung (Dept. of Prosthodontics, Dental College, Yonsei University)
Lee Keun-Woo (Dept. of Prosthodontics, Dental College, Yonsei University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.41, no.5, 2003 , pp. 656-673 More about this Journal
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 and method : 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 $H_2O$ 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 $H_2O$ 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(${\times}10000$).
Keywords
Refiring; Feldspathic dental porcelain; Metal ceramic restoration; Temporary cementation; Water immersion; Fourier Transform Infrared(FT-IR); Flexural strength; Fracture toughness; Leucite crystal;
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