The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

MARGINAL ADAPTATION OF THE CONICAL INNER CROWN FABRICATED WITH CAD/CAM

CAD/CAM으로 제작한 코누스내관의 변연적합

  • Kim In-Sup (Department of Prosthodontics, College of Dentistry, Chosun University) ;
  • Kang Dong-Wan (Department of Prosthodontics, College of Dentistry, Chosun University)
  • 김인섭 (조선대학교 치과대학 보철학교실) ;
  • 강동완 (조선대학교 치과대학 보철학교실)
  • Published : 2002.02.01
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Abstract

This study was to evaluate the fabrication method and marginal adaptation of the conical inner crown fabricated with CAD/CAM. The informations on abutment teeth were transferred to a computer with a micro contact digitizer, which had a $50{\mu}m$ accuracy on the master die. A conical inner crown was designed on a computer and a real crown was machined based on this design using CAM. The marginal fit of a computer-machined conical inner crown was assessed using electron microscopy Measurement of the marginal gap between the conical inner crown and the abutment was performed on four different locations (mesial, distal, buccal, and lingual surfaces) of the finish line. The evaluation was based on 10 test specimens. The results were as follow. 1 The mean marginal gap between the conical inner crown and abutment tooth was $83.2{\pm}43{\mu}m$, 28.9% of the specimen showed marginal gap over $100{\mu}m$. 2. The fabrication method using CATRS and CAM provided clinically acceptable marginal fitness compared to conventional casting method (P<0.05).

Keywords

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