DOI QR코드

DOI QR Code

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

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.

Keywords

References

  1. Addison O, Cao X, Sunnar P, Fleming GJP. Machining variability impacts on the strength of a "chair-side" CAD-CAM ceramic. Dent Mater, 28(8), 880-887, 2012. https://doi.org/10.1016/j.dental.2012.04.017
  2. Beuer F, Schweiger J, Edelhoff D. Digital dentistry: an overview of recent developments for CAD/CAM generated restorations. Br Dent J, 204(9), 505-511, 2008. https://doi.org/10.1038/sj.bdj.2008.350
  3. Boening KW, Wolf BH, Schmidt AE, Kastner K, Walter MH. Clinical fit of Procera AllCeram crowns. J Prosthet Dent, 84(4), 419-424, 2000. https://doi.org/10.1067/mpr.2000.109125
  4. Bosch G, Ender A, Mehl A. A 3-dimensional accuracy analysis of chairside CAD/CAM milling processes. J Prosthet Dent, 112(6), 1425-1431, 2014. https://doi.org/10.1016/j.prosdent.2014.05.012
  5. Cho HD, Jun YT, Yang MY. Five-axis CNC milling for effective machining of sculptured surfaces. Int J Prod Res, 31(11), 2559-2573, 1993. https://doi.org/10.1080/00207549308956883
  6. Delong R, Heinzen M, Hodges JS, Ko CC, Douglas WH. Accuracy of a system for creating 3D computer models of dental arches. J Dent Res, 82(6), 438-442, 2003. https://doi.org/10.1177/154405910308200607
  7. Gonzalo E, Suarez MJ, Serrano B, Lozano JF. A comparison of the marginal vertical discrepancies of zirconium and metal ceramic posterior fixed dental prostheses before and after cementation. J Prosthet Dent, 102(6), 378-384, 2009. https://doi.org/10.1016/S0022-3913(09)60198-0
  8. Grenade C, Mainjot A, Vanheusden A. Fit of single tooth zirconia copings: comparison between various manufacturing processes. J Prosthet Dent, 105(4), 249-255, 2011. https://doi.org/10.1016/S0022-3913(11)60040-1
  9. Huh JB, Park CG, Kim HY, Park CK, Shin SW. Evaluation using Replica Technique on the marginal and internal fitness of zirconia cores by several CAD/CAM systems, J Adv Prosthodont, 48(2), 135-142, 2010.
  10. Hung SH, Hung KS, Eick JD, Chappel RP. Marginal fit of porcelain-fused-to metal and two types of ceramic crown. J proshet Dent, 63(1), 26-31, 1990. https://doi.org/10.1016/0022-3913(90)90260-J
  11. Keshvad A, Hooshmand T, Asefzadeh F, Khalilinejad F, Alihemmati M, Van Noort R. Marginal gap, internal fit, and fracture load of leucite-reinforced ceramic inlays fabricated by CEREC inLab and hot pressed techniques. J Prosthodont, 20(7), 535-540, 2011. https://doi.org/10.1111/j.1532-849X.2011.00745.x
  12. Lee KB, Park CW, Kim KH, Kwon TY. Marginal and internal fit of all-ceramic crowns fabricated with two different CAD/CAM systems. Dent Mater J, 27(3), 422-426, 2008. https://doi.org/10.4012/dmj.27.422
  13. Miyazaki T, HOtta Y, Kunii J, Kuriyama S, Tamaki Y. A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dent mater J, 28(1), 44-56, 2009. https://doi.org/10.4012/dmj.28.44
  14. Persson M, Andersson M, Bergman B. The accuracy of a high-precision digitizer for CAD/CAM of crowns. J Prosthet Dent, 74(3), 223-229, 1995. https://doi.org/10.1016/S0022-3913(05)80127-1
  15. Quintas AF, Oliveira F, Bottino MA. Vertical marginal discrepancy of ceramic copings with different ceramic materials, finish lines, and luting agents: an in vitro evaluation. J Prosthet Dent, 92(3), 250-257, 2004. https://doi.org/10.1016/j.prosdent.2004.06.023
  16. Schaefer O, Kuepper H, Thompson GA, Cachovan G, Hefti AF, Guentsch A. Effect of CNCmilling on the marginal and internal fit of dental ceramics: A pilot study. Dent Mat, 29(8), 851-858, 2013. https://doi.org/10.1016/j.dental.2013.04.018
  17. Sjogren G. Marginal and internal fit of four different types of ceramic inlays after luting: an in vitro study. Acta Odontologica, 53(1), 24-28, 1995. https://doi.org/10.3109/00016359509005940
  18. Sturdevant JR, Bayne SC, Heymann HO. Margin gap size of ceramic inlays using secondgeneration CAD/CAM equipment. J Esthet Dent, 11(4), 206-214, 1999. https://doi.org/10.1111/j.1708-8240.1999.tb00400.x