The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

FRACTURE STRENGTH OF THE IPS EMPRESS CROWN : THE EFFECT OF OCCLUSAL DEPTH AND AXIAL INCLINATION ON LOWER FIRST MOLAR

IPS Empress 도재관의 파절강도: 하악 제1대구치에서 교합면 두께와 축면경사도에 따른 영향

  • Kim Sung-Hoon (Department of Prosthodontics, College of Dentistry, Wonkwang University) ;
  • Lee Jin-Han (Department of Prosthodontics, College of Dentistry, Wonkwang University) ;
  • Kim Yu-Lee (Department of Prosthodontics, College of Dentistry, Wonkwang University) ;
  • Dong Jin-Keun (Department of Prosthodontics, College of Dentistry, Wonkwang University)
  • 김성훈 (원광대학교 치과대학 치과보철학교실) ;
  • 이진한 (원광대학교 치과대학 치과보철학교실) ;
  • 김유리 (원광대학교 치과대학 치과보철학교실) ;
  • 동진근 (원광대학교 치과대학 치과보철학교실)
  • Published : 2003.02.01
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Abstract

The purpose of this study was to compare the fracture strength of the IPS Empress ceramic crown according to the occlusal depth (1.5mm, 2.0mm, 2.5mm) and axial inclination ($4^{\circ},\;8^{\circ},\;12^{\circ}$) of the lower First Molar. After 10 metal dies were made for each group, the IPS Empress ceramic crowns were fabricated and cemented with resin cement(Bistite resin cement, Tokuyama Soda Co. LTD., Japan). The cemented crowns were mounted on the testing jig with inclination of 30 degrees and the universal testing machine(Zwick Z020, Zwick, Germany)was used to measure the fracture strength. The results of this study were as follows : 1. The fracture strength of the ceramic crown with 2.5mm depth and $12^{\circ}$ inclination was the highest (1789 N). Crowns of 1.5mm depth and $4^{\circ}$ inclination had the lowest strength (1091 N). 2. There were no significant differences in the fracture strength by axial inclination of the same occlusal depth group. 3. Most fracture lines began at the loading area and extended through proximal surface perpendicular to the margin, irrespective of occlusal depth. Size of fragment was affected by the amount of occlusal reduction.

Keywords

References

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