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KMID : 0362419960340020309
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Journal of Korean Academy of Prosthodontics
1996 Volume.34 No. 2 p.309 ~ p.319
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An evaluatin of fracture toughness of dental ceramics by indentation fracture method
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Ahn Seung-Geun
Lee Ju-Hyung
Bae Tae-Sung
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Abstract
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This study was performed to evaluate the fracture toughness of seven commercially available dental ceramics by indentation fracture method. All specimens were fabricated to the final dimensions of approximately 12mm in diameter 2mm in thickness. The characteristic indentation dimensions of Vickers or Knoop indentation were measured to calculate the fracture toughness values and Young’s moduli. @ES The results obtained were summarized as follows ; @EN 1. Young’s modulus and Vickers hardness of Vita In-Ceram showed the maximum values of 154.4±49.2 Gpa and 12.60±0.71 Gpa, respectively. Results of Scheff test exhibited the significant difference between Vita In-Ceram group and others p<0.01). 2. Maximum fracture toughness of 2.562±0.37 Mpam1/2 for Vita In-Ceram and the maximum one of 0.908±0.132 Mpam1/2 for Vitadur-N were calculated. Results of Scheff test showed the significant difference between Vita In-Ceram group and Vita Hi-Ceram (p<0.05) : also between Vita In-Ceram or Vita Hi-Ceram and others(p<0.01). 3. The alumina-based core ceramics showed the aspect of Palmqvist crack for the indentation load of 49.0 N, but others showed the median/lateral crack for the indentation load of 9.8 N.
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