Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Observations of surface roughness of Co-Cr alloys according to grinding time of dental barrel finishing

치과용 바렐연마기의 연마시간에 따른 Co-Cr 합금의 표면거칠기 관찰

  • Ko, Hyeon-Jeong (Department of Dental Laboratory Science, Catholic University of Pusan) ;
  • Park, Yu-Jin (Department of Dental Laboratory Science, Catholic University of Pusan) ;
  • Choi, Sung-Min (Department of Dental Laboratory Science, Catholic University of Pusan)
  • 고현정 (부산가톨릭대학교 치기공학과) ;
  • 박유진 (부산가톨릭대학교 치기공학과) ;
  • 최성민 (부산가톨릭대학교 치기공학과)
  • Received : 2021.08.18
  • Accepted : 2021.09.13
  • Published : 2021.09.30
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Abstract

Purpose: The aim of this study was to observe the surface roughness and surface topography of cobalt-chrome (Co-Cr) alloys with grinding time in dental barrel finishing. Methods: This study involved two types of Co-Cr alloys. Specimens were manufactured with the dimensions 10×10×2 mm. Each specimen was cast according to the manufacturer's instructions. The cast alloys were polished for 35 minutes at intervals of five minutes in an automatic barrel finishing. Specimens were imaged with a three-dimensional optical microscope to measure surface roughness. Results: BC specimens and GM specimens had the highest roughness (Ra) values in the ungrained control group, and the lowest Ra values were measured 20 minutes after grinding. Conclusion: The best conditions for grinding Co-Cr alloy using a dental barrel finishing were a weight ratio of polishing media, water, and compound of 150 g:200 g:5 g, and a rotation speed of 450 rpm. Grinding time to obtain appropriate surface roughness should be limited to 15 to 30 minutes.

Keywords

Acknowledgement

This paper was supported by RESEARCH FUND offered from Catholic University of Pusan.

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