Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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The comparison of accuracy on three-unit fixed dental prosthesis made with CAD/CAM milling machines

치과 캐드캠 밀링장비에 따른 3본브릿지의 정확도 비교

  • Bae, So-Yeon (Department of Dental Laboratory Science & Engineering, College of Health Science, Graduate School, Korea University) ;
  • Park, Jin-Young (Department of Dental Laboratory Science & Engineering, College of Health Science, Graduate School, Korea University) ;
  • Kim, Ji-Hwan (Department of Dental Laboratory Science & Engineering, College of Health Science, Graduate School, Korea University) ;
  • Kim, Hae-Young (Department of Dental Laboratory Science & Engineering, College of Health Science, Graduate School, Korea University) ;
  • Kim, Myung-Bae (Korea academy of CAD/CAM Dental technology) ;
  • Kim, Woong-Chul (Department of Dental Laboratory Science & Engineering, College of Health Science, Graduate School, Korea University)
  • 배소연 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 박진영 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김지환 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김혜영 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김명배 (대한 치과CAD/CAM가공 학회) ;
  • 김웅철 (고려대학교 대학원 보건과학과 치의기공전공)
  • Received : 2014.12.31
  • Accepted : 2015.03.28
  • Published : 2015.03.30
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Abstract

Purpose: The purpose of this study was to compare the accuracy of the maxillary three-unit fixed dental prosthesis (FDPs) made using two CAD/CAM milling machines : DCM Group(Dentaim CAD/CAM milling machine), WCM Group(Wieland CAD/CAM milling machine). Methods: Each of 10 duplicate models was scanned by blue light scanner(Identica, Medit, Korea), and the three-unit FDPs (STL file) was designed using DelcamCAD. A total of 20 three-unit FDPs was fabricated, comprising 2 groups of 10 specimens each (shrinkage ratio is 1:1). The first three-unit FDPs STL file was used as a CAD reference model (CRM). Obtained STL files by scanning the inner surface of three-unit FDPs were convened into the point clouds-ASC II files. Discrepancies between the point clouds and CRM were measured by superimposition software. Statistical methods to analyze the data were used non-parametric method. The mean (SD) values were compared by a Mann-Whitney U-test. Type one error rate was set at 0.05. Results: WCM group had small discrepancies with $2.17{\mu}m$ of mean value compared to $4.44{\mu}m$ in DCM group. The accuracy values between the two groups showed a sratistically significant difference (Table 2, p<.05). Conclusion: The accuracy of the three-unit fixed dental prosthesis(FDPs) made of two CAD/CAM milling machines were statistically different. Accuracy with which the prosthesis made of WCM group was superior.

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References

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