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KMID : 0362419940320020195
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Journal of Korean Academy of Prosthodontics
1994 Volume.32 No. 2 p.195 ~ p.211
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A comparative study on the flexure strength of the ceramics for all-ceramic crowns
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Yu Hyoung-Woo
Song Chang-Yong
Bae Tae-Sung
Song Kwang-Yeob
Park Charn-Woon
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Abstract
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The purpose of this study was to evaluate the fracture resistance of the four kinds of dental porcelains for the all-ceramic crown(Vita In-Ceram, vita Hi-Ceram,IPS-Empress, Vitadur-N) and one kind for the metal-ceramic crown(Vita VMK 68) was used as the control group. In order to determine the fracture resistance, the bi-axial flexure strength was measured at a crosshead speed of 0.5mm/min, and the Vickers hadrness was measured at an indentation load of 1kg for 20 seconds. @ES The results obtained were summarized as follows: @EN 1. The maximum Weibull modulus of 24.61 for Vitadur-N and the minimum one the minimum one of 8.82 for IPS-Empress were observed ; the maximum characteristic strength of 353.26Mpa for Vita In-Ceram and the minimum that of 63.20MPa for Vitadur-N were also observed. 2. The maximum mean bi-axial flexure strength of 339.12MPa for Vita In-Ceram and thd minimum one of 61.99MPa for Vitadur-N were calculated.
Results of the Scheffe test indicated that the statistically significant difference (P<0.05) existed between Vita In-Ceram or Vita Hi-Ceram and the others ; also between IPS-Empress and Vitadur-N. 3. The maximum mean hardness of 980.55kg/㎟for Vita VMK 68 appeared. Results of the Scheffe test indicated that statistically significant difference(P<0.05) existed between Vita In-Ceram or Vita Hi-Ceram and the others ; also between IPS-Empress and Vita VMK 68.
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