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Review on factors affecting the optical properties of dental zirconia

치과용 지르코니아의 광학적 성질에 영향을 미치는 요소에 대한 문헌고찰

  • Park, Chan-Ho (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University) ;
  • Ko, Kyung-Ho (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University) ;
  • Park, Chan-Jin (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University) ;
  • Cho, Lee-Ra (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University) ;
  • Huh, Yoon-Hyuk (Department of Prosthodontics and Research Institute of Oral Science, College of Dentistry, Gangneung-Wonju National University)
  • 박찬호 (강릉원주대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 고경호 (강릉원주대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 박찬진 (강릉원주대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 조리라 (강릉원주대학교 치과대학 치과보철학교실 및 구강과학연구소) ;
  • 허윤혁 (강릉원주대학교 치과대학 치과보철학교실 및 구강과학연구소)
  • Received : 2021.10.18
  • Accepted : 2021.10.27
  • Published : 2021.12.31

Abstract

Clinical applications of translucent zirconia as well as traditional zirconia (3 mol% yttria stabilized tetragonal zirconia polycrystal, 3Y-TZP) are increasing. For this reason, studies on factors affecting the optical properties of dental zirconia have been continuously reported. The optical effect of dental zirconia may vary depending on the yttria content, the thickness of the prosthesis, the sintering process, polishing, glazing and cementation in laboratory and clinical procedures. Increasing the yttria concentration can reduce the masking effect. Translucency decreases as the thickness of the restoration increases, but the required thickness may vary depending on the properties of the zirconia block. The high-speed sintering method can shorten the manufacturing time, but in some cases, the translucency of the prosthesis may decrease. In addition, the optical properties can be affected by the surface roughness of zirconia and the polishing process. The use of an appropriate colored cement can help with the masking effect of zirconia and can be useful for color matching for more esthetic results.

기존의 3 mol%의 이트라아(Y2O3)로 안정화된 정방정 지르코니아(3 mol% yttria stabilized tetragonal zirconia polycrystal, 3Y-TZP) 뿐만 아니라 이트리아 함량이 증가된 반투명 지르코니아(translucent zirconia)를 이용한 단일구조 지르코니아 보철물의 사용이 증가하면서 치과용 지르코니아의 광학적 성질에 영향을 미치는 요소에 대한 연구가 지속적으로 이루어지고 있다. 이트리아 함량, 보철물 두께, 소결과정, 연마 및 광택소성 그리고 치과용 시멘트 등과 같은 치과기공실 및 진료실 과정의 처리 방법에 따라 치과용 지르코니아의 광학적 효과가 다르게 나타난다. 이트리아 농도의 증가는 반투명도의 개선과 동시에 차폐효과의 감소를 유발할 수 있으며 수복물 두께가 증가할수록 반투명도는 감소하지만 지르코니아 블록의 물성에 따라 요구되는 두께가 다르므로 주의해야 한다. 고속소결 방식은 제작시간을 단축시키나 경우에 따라 보철물의 반투명도가 감소할 수 있다. 지르코니아의 표면거칠기 및 광택소성 처리에 따라 광학적 결과도 영향을 받을 수 있다. 적절한 유색 시멘트의 사용은 지르코니아의 차폐효과에 도움이 되어 보다 자연스러운 보철치료가 가능하다.

Keywords

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