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밀링 방법과 주조 방법으로 제작한 코발트-크롬 합금의 3점 굽힘 시험을 통한 기계적인 특성 비교

Comparison of Mechanical Properties of Milled and Casted Cobalt-Chromium Alloys Using Three-point Bending Tes

대한구강악안면임플란트학회지 2019년 23권 3호 p.162 ~ 168
홍준기 ( Hong Joon-Ki ) - 서울대학교 치의학대학원 치과보철학교실

김성균 ( Kim Seong-Kyun ) - 서울대학교 치의학대학원 치과보철학교실
허성주 ( Heo Seong-Joo ) - 서울대학교 치의학대학원 치과보철학교실
곽재영 ( Koak Jai-Young ) - 서울대학교 치의학대학원 치과보철학교실
안진수 ( Ahn Jin-Soo ) - 서울대학교 치의학대학원 치과생체재료과학교실


Purpose: The objective of this study was to investigate the mechanical properties of Cobalt- Chromium (Co-Cr) alloys made by conventional casting method and Computer-Aided Design/ Computer ?Aided Manufacturing (CAD-CAM) milling method.

Material and Methods: Co-Cr alloy specimens (n=8) were made by casting and milling methods.
The size of the specimens was 34 mm × 13 mm × 1.5 mm, according to ISO 22674: 2016. Three-point bending test was conducted by universal testing machine, stress and strain values were obtained.
Statistical significance was tested using the t-test.

Results: Flexural strength of the milled sample was significantly lower than of casted (p < 0.05).
Similarly, 0.2% yield strength of milled sample was also lower than of casted (p < 0.05).

Conclusion: Although there is a significant difference in mechanical properties of milled and casted Co-Cr alloy, they are both are clinically acceptable.


CAD/CAM; Co-Cr alloy; Mechanical properties; Milling metal; Three-point bending test
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