The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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A COMPARATIVE STUDY ON THE FLEXURE STRENGTH OF THE CERAMICS FOR ALL-CERAMIC CROWNS

All-ceramic Crown 용 도재의 굽힘강도에 관한 비교연구

  • Yu Hyoung-Woo (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Song Chang-Yong (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Bae Tae-Seong (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Song Kwang-Yeob (Department of Prosthodontics, College of Dentistry, Chonbuk National University) ;
  • Park Chan-Woon (Department of Prosthodontics, College of Dentistry, Chonbuk National University)
  • 유형우 (전북대학교 치과대학 보철학교실) ;
  • 송창용 (전북대학교 치과대학 보철학교실) ;
  • 배태성 (전북대학교 치과대학 보철학교실) ;
  • 송광엽 (전북대학교 치과대학 보철학교실) ;
  • 박찬운 (전북대학교 치과대학 보철학교실)
  • Published : 1994.07.01
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Abstract

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 non(Vita VMK 68) was used as the control group. In order to determine the fracture resistance, the hi-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. The results obtained were summarized as follows ; 1. The maximum Weibull modulus of 24.61 for Vitadur-N and the minimum one of 852 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 $980.55kg/mm^2$ 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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