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Three-dimensional evaluation of the internal adaptation of single and three-unit fixed dental restoration by CAD/CAM milling system
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CAD/CAM 밀링 시스템을 활용한 단일 치관과 3본 교의치의 3D 적합도 평가

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Type
Academic journal
Author
Kim, So-Ri (고려대학교 대학원 보건과학과 치의기공전공) Kim, Chong-Myeong (고려대학교 보건과학연구소) Kim, Woong-Chul (고려대학교 대학원 보건과학과 치의기공전공) Kim, Ji-Hwan (고려대학교 대학원 보건과학과 치의기공전공)
Journal
The Korean Academy of Dental Technology 대한치과기공학회지 대한치과기공학회지 제39권 제1호
Published
2017.1
Pages
35 - 42 (8page)

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Three-dimensional evaluation of the internal adaptation of single and three-unit fixed dental restoration by CAD/CAM milling system
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Abstract· Keywords

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Purpose: The purpose of this paper was to evaluate the occurrence of errors regarding adaptation by conducting a three-dimensional assessment comparing the bridge type dental restoration after the cutting process, which has multiple abutments, with a single type dental restoration. Methods: By using ten identical files obtained by scanning the master model, thirty designs were created consisting of ten maxillary right first premolars and ten maxillary right first molars with single crown abutments, along with ten bridge designs with the identical abutment. A 5-axis milling machine was used to produce the design file. The produced denture prostheses were scanned using a silicone replica for a STL file. An evaluation was conducted using 3D analysis software on the master model and each of the thirty data files. Results: The RMS value of the pre-molar (14) was $38.4{\pm}4{\mu}m$ for single and $54.7{\pm}6{\mu}m$ for bridge abutment; therefore, a statistically significant difference was observed for single and bridge designs although both shared the same abutment form (P<.05). Also, the RMS value of the molar (16) was $47.6{\pm}2{\mu}m$ and $56.6{\pm}5{\mu}m$ for the single and bridge designs, respectively, thereby presenting a statistically significant difference (P<.05). Conclusion: As a result, dental prosthesis fabricated using the single method presented better internal adaptation outcomes.
#CAD/CAM system #Milling system #Three-dimensional evaluation #Gap #Three-unit fixed dental restorations

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References (19)

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Anadioti E / 2014 / 3D and 2D Marginal Fit of Pressed and CAD/CAM Lithium Disilicate Crowns Made from Digital and Conventional Impressions / J Prosthodont 23(8):610~617 google schola Beuer F / 2008 / Digital dentistry:an overview of recent developments for CAD/CAM generated restorations / Br dent J 204(9):505~511 google schola De Souz a AF / 2014 / Investigating the cutting phenomena in free-form milling using a ball-end cutting tool for die and mold manufacturing / Int J Adv Manuf Technol 71:1565~1577 google schola Kim GM / 2003 / Estimation of cutter deflection and form error in ball-end milling processes / Int J March Tools Manufact 43:917~924 google schola 김재홍 / 2014 / Accuracy and precision of polyurethane dental arch models fabricated using a three-dimensional subtractive rapid prototyping method with an intraoral scanning technique / 대한치과교정학회지 44(2):69~76 google schola

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