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논문 상세정보

반복 사용된 IPS Empress ceramic의 물리적 성질에 관한 연구 Part IV : 경도 및 파괴인성에 관한 연구

THE PHYSICAL PROPERTIES OF REUSED IPS EMPRESS CERAMIC PART IV : HARDNESS AND FRACTURE TOUGHNESS

Abstract

Statement of the problem : IPS Empress ceramic has been used as one of a esthetic restorative material since it's development, but the broad application of IPS Empress ceramic to clinical prosthodontic field has been limited by its high material cost. Purpose : This study was investigated to evaluate the hardness and fracture toughness after recycling of the IPS Empress ceramic. Material and methods : Reused specimens of IPS Empress were fabricated with repeated pressing. The hardness(Vickers hardness) and fracture toughness of 1st, 2nd and 3rd pressed specimens were measured with Digital Micro Hardness Tester(Model MXT70, Matsuzawa Seiki Co., Ltd, Tokyo, Japan). The obtained data were analyzed using SPSS(Ver 9.5). Result : The mean value of the hardness in the 1st, 2nd and 3rd pressed Empress were $6.23{\pm}0.48MPa,\;5.50{\pm}0.25MPa$, and $5.70{\pm}0.42MPa$. The hardness of the 1st pressing ceramic was higher than those or the 2nd and 3rd pressed ceramics(P0.05). The mean value of the fracture toughness was $1.71{\pm}0.16MPam^{1/2}$ in 1st pressed ceramic, $1.78{\pm}0.10MPam^{1/2}$ in 2nd pressed and $1.73{\pm}0.14MPam^{1/2}$ in 3rd pressed IPS ceramic. Fracture toughness of the 2nd pressed ceramic was the highest and that of the 1st pressed ceramic was the lowest. There was no significant difference of fracture toughness among them(P>0.05). Conclusion : Hardness of the 2nd and 3rd pressed IPS Empress ceramics were lesser than that of 1st pressed IPS Empress ceramic(P0.05).

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참고문헌 (12)

  1. Baharav H, Laufer B, Pilo R, Cardash HS. Effect of glaze thickness on the fracture toughness and hardness of alumina-reinforced porcelain. J prosthet Dent 1999;81:515-9 
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이 논문을 인용한 문헌 (1)

  1. Kang, Jung-In ; Heo, Yu-Ri ; Lee, Myeong-Seon ; Son, Mee-Kyoung 2014. "Understanding and trends of esthetic treatment in prosthodontics : IPS e.max" JKSDH : Journal of Korean Society of Dental Hygiene = 한국치위생학회지, 14(4): 447~452 

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