Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
권호 표지

Marginal dicrepancy and topography of the artificial crown on the extracted abutment

발치된 치아에 부착된 수복물의 변연 적합 및 형태

  • Lee, Jeong-Hoon (Dept. of Prosthodontics, College of Dentistry Chosun University) ;
  • Choi, Min-Ho (Dept. of Prosthodontics, College of Dentistry Chosun University) ;
  • Kim, Min-Ho (Dept. of Prosthodontics, College of Dentistry Chosun University) ;
  • Kang, Dong-Wan (Dept. of Prosthodontics, College of Dentistry Chosun University)
  • 이정훈 (조선대학교 치과대학 보철학교실) ;
  • 최민호 (조선대학교 치과대학 보철학교실) ;
  • 김민호 (조선대학교 치과대학 보철학교실) ;
  • 강동완 (조선대학교 치과대학 보철학교실)
  • Published : 2002.12.30
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Abstract

The purpose of the present study was to evaluate the marginal discrepancy and topography of artificial crown on teeth extracted due to severe periodontal disease. Twenty specimens were invested into metamethylacrylate resin and cutted into vertical slices along with the long axis of tooth. The selected marginal discrepancy between the outer edge of the crown and the finishing line of abutment was examined by stereo- microscope(Olympus, PM-VSP-3, Japan) at magnification of up to 10, and the topography of finishing margin on crown was observed by stereomicroscopeat magnification of up to $70{\times}$. The results were as follows. (1) The mean marginal discrepancy between extracted tooth and artificial crown were $50.82{\mu}m$. (2) There was a considerable difference in the microstructure of finishing margins among specimens. Microscopic Structure on finishing margin showed indefinite line, poor fit (open, underextended and overextended), distorted margin, and surface roughness. This study suggested that there could be necessary to consider the response of periodontium to the emergence profile of natural tooth and precision of marginal geometry while establishing treatment planning for the reconsruction of the artificial crown.

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