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KMID : 0362120160380020063
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Journal of Technologic Dentistry
2016 Volume.38 No. 2 p.63 ~ p.68
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Evaluation of internal adaptation of PMMA 3-unit bridge manufactured by 5-axis milling machine
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Kim Chong-Myeong
Kim Jae-Hong
Kim Ji-Hwan
Kim Woong-Chul
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Abstract
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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±SD values for PRE group, MOL group, and BRI group were 51.2±18.2, 44.8±10.0, and 52.1±8.3㎛, 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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KEYWORD
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Dental CAD/CAM, Internal adaptation, Provisional crown, Subtractive method, Threedimensional, 5-axis milling
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