The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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A study on the marginal fit of CAD/CAM 3-unit bridges

CAD/CAM 3-unit bridges의 변연 적합도에 관한 연구

  • Lee, Ki-Hong (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Yeo, In-Sung (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Kim, Sung-Hun (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Han, Jung-Suk (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Lee, Jai-Bong (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Yang, Jae-Ho (Department of Prosthodontics, College of Dentistry, Seoul National University)
  • 이기홍 (서울대학교 치의학대학원 치과보철학교실) ;
  • 여인성 (서울대학교 치의학대학원 치과보철학교실) ;
  • 김성훈 (서울대학교 치의학대학원 치과보철학교실) ;
  • 한중석 (서울대학교 치의학대학원 치과보철학교실) ;
  • 이재봉 (서울대학교 치의학대학원 치과보철학교실) ;
  • 양재호 (서울대학교 치의학대학원 치과보철학교실)
  • Received : 2010.10.04
  • Accepted : 2011.03.11
  • Published : 2011.04.29
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Abstract

The purpose of this study was to assess the marginal fit of three-unit bridges produced using LAVA CAD/CAM (computer-aided design/computer-aided manufacturing) system and conventional PFG in vitro. Materials and methods: #11, 13 resin teeth were prepared on dentiform, then duplicated. Twenty resin models were fabricated, ten for PFG 3-unit bridges and ten for LAVA 3-unit bridges. Each bridge was cemented on the resin model. Marginal discrepancy was measured with stereoscopic microscope (Nikon DS-Fi 1, Nikon, Japan) at a magnification of ${\times}75$. Independent t-test was done for the statistical analysis. Results: The mean marginal discrepancy values and standard deviations of the PFG bridges was $97.1{\pm}18.7\;{\mu}m$ for incisors, $76.6{\pm}21.8\;{\mu}m$ for canines; that of the LAVA bridges was $90.4{\pm}26.7\;{\mu}m$ for incisor, $110.2{\pm}30.2\;{\mu}m$ for canines. The mean marginal discrepancy between PFG and LAVA for incisor did not show significant difference (P<.05). But for canine, the mean marginal discrepancy of PFG bridges was smaller than that of LAVA bridges (P<.05). Conclusion: The LAVA CAD/CAM 3-unit bridges and the PFG 3-unit bridges showed clinically acceptable marginal discrepancy.

연구 목적: 본 연구에서는CAD/CAM (computer-aided design / computer-aided manufacturing) 시스템으로 제작된LAVA (3M ESPE, Seefeld, Germany) 3-unit bridge와 통상적인 방법으로 제작된 PFG 3-unit bridge의 변연 적합도를 비교 분석해 보고자 한다. 연구 재료 및 방법: 레진치를 전부 도재관을 위한 삭제를 시행하고 인상 채득하여 레진 모형 (Exakto-form model resin, Bredent, Senden, Germany)을군당10개씩 제작하였다. 레진 모형의 인상을 채득하여 석고 모형을 제작하고 PFG, LAVA 3-unit bridge를 10개씩 제작하였다. 제작된 bridge를 레진 모형에 접착하고 실체 현미경(Stereoscopic microscope, Nikon DS-Fi 1, Nikon, Japan)을 사용하여 각 치아당 4점에서 변연 적합도를 측정하였다 (${\times}75$). 측정된 결과는 independent t-test로 통계 분석하였다 (${\alpha}$ = 0.05). 결과: 각 군에서 변연 적합도의 평균과 표준편차는 PFG bridge 중절치에서는 $97.1{\pm}18.7\;{\mu}m$, 견치에서는 $76.6{\pm}21.8\;{\mu}m$, LAVA bridge 중절치에서는 $90.4{\pm}26.7\;{\mu}m$, 견치에서는$110.2{\pm}30.2\;{\mu}m$ 이었다. PFG 3-unit bridge와LAVA 3-unit bridge에서 중절치에서는 통계적 유의성이 없었고, 견치에서는LAVA의 변연 간격이 큰 것으로 나타났다 (P<.05). 결론: PFG 3-unit bridge와 LAVA 3-unit bridge 두 군 모두 임상적으로 받아들여질 만한 변연 적합도를 보였다.

Keywords

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