Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Evaluation of internal adaptation of PMMA 3-unit bridge manufactured by 5-axis milling machine

5축 밀링으로 가공한 PMMA 3본 브릿지의 내면 적합도 평가

  • Kim, Chong-Myeong (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Jae-Hong (Department of Dental Technology, Medical campus, KyungDong University) ;
  • Kim, Ji-Hwan (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Woong-Chul (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University)
  • 김총명 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김재홍 (경동대학교 치기공학과) ;
  • 김지환 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김웅철 (고려대학교 대학원 보건과학과 치의기공전공)
  • Received : 2016.01.15
  • Accepted : 2016.06.03
  • Published : 2016.06.30
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Abstract

Purpose: The purpose of this study was to assess the internal fitness of the PMMA 3-unit bridge that was fabricated with 5-axis milling machine and to verify the clinically allowable values. Methods: For fabrication of the crown bridge in this study, 25-27 abutment teeth were used. The prepare abutment teeth were scanned with a scanner and 3-unit bridge was designed by using design software. Upon the completion of the design, the 3-unit bridge was fabricated by using a PMMA block with 5-axis milling machine. The internal surface of the fabricated 3-unit bridge was scanned by using a scanner and the difference between the 3-unit bridge and the abutment teeth was assessed by merging them together. Results: $RMS{\pm}SD$ values for PRE group, MOL group, and BRI group were $51.2{\pm}18.2$, $44.8{\pm}10.0$, and $52.1{\pm}8.3{\mu}m$, respectively. The mean of the PRE group was bigger than that of the MOL and BRI group; however, statistically significant difference was not found (p>0.05). Conclusion: The PMMA 3-unit bridge that was fabricated with 5-axis milling machine presented stable internal values for each crown and overall internal values were within the range of clinically allowable values.

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References

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