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치과용 도재의 재소성 과정중 수분함량이 강도에 미치는 영향

Other Titles
 Effect of Water Content on the Flexural Strength During Refiring in Dental Porcelain 
Authors
 박혜양  ;  심준성  ;  이근우 
Citation
 Journal of Korean Academy of Prosthodontics (대한치과보철학회지), Vol.41(5) : 656-673, 2003 
Journal Title
 Journal of Korean Academy of Prosthodontics (대한치과보철학회지) 
ISSN
 0301-2876 
Issue Date
2003
MeSH
Refiring ; Feldspathic dental porcelain ; Metal ceramic restoration ; Temporary cementation ; Water immersion ; Fourier Transform Infrared(FT-IR) ; Flexural strength ; Fracture tough-ness ; Leucite crystal
Keywords
Refiring ; Feldspathic dental porcelain ; Metal ceramic restoration ; Temporary cementation ; Water immersion ; Fourier Transform Infrared(FT-IR) ; Flexural strength ; Fracture tough-ness ; Leucite crystal
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 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(×10000).
Files in This Item:
T200306079.pdf Download
DOI
OAK-2003-01132
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Shim, June Sung(심준성) ORCID logo https://orcid.org/0000-0003-1428-0122
Lee, Keun Woo(이근우) ORCID logo https://orcid.org/0000-0002-3153-190X
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/114292
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