The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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The comparison of the accuracy of temporary crowns fabricated with several 3D printers and a milling machine

  • Junsik Lee (Dental Research Institute and Department of Dental Biomaterials Science, School of Dentistry, Seoul National University) ;
  • Sungwon Ju (Dental Research Institute and Department of Dental Biomaterials Science, School of Dentistry, Seoul National University) ;
  • Jihyung Kim (L Dental Hospital) ;
  • Sion Hwang (Dental Research Institute and Department of Dental Biomaterials Science, School of Dentistry, Seoul National University) ;
  • Jinsoo Ahn (Dental Research Institute and Department of Dental Biomaterials Science, School of Dentistry, Seoul National University)
  • Received : 2023.02.10
  • Accepted : 2023.04.21
  • Published : 2023.04.30
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Abstract

PURPOSE. The purpose of this in vitro study was to compare the accuracy of various 3D printers and a milling machine. MATERIALS AND METHODS. The die model was designed using CAD (Autodesk Inventor 2018 sp3). The 30 ㎛ cement space was given to the die and the ideal crown of the mandibular left first molar was designed using CAD (ExoCAD). The crowns were produced using the milling machine (Imes-icore 250i) and the 3D printers (Zenith U, Zenith D, W11) and they were divided into four groups. In all groups, the interior of each crown was scanned (Identica blue) and superimposed (Geomagic Control X) with the previously designed die. The difference between the die and the actual crown was measured at specific points. The Kruskal-Wallis test, the Mann-Whitney test, and Bonferroni's method were performed with a statistical analysis software (P < .008 in inter-group comparison P < .001 in intra-group comparison). RESULTS. In all groups, the center of the occlusal area and the anti-rotational dimple area showed significantly greater difference and the marginal area showed the smallest difference comparatively. The mean value of the difference in each area and the sum of the differences were higher in order of W11, Imes-icore 250i, Zenith D, and Zenith U. CONCLUSION. The digital light processing (DLP) method shows higher accuracy compared to the sereolithography (SLA) method using the same resin material.

Keywords

Acknowledgement

This work was supported by the National Research Foundation [2021R1A6A1A03039462 and 2017M3A9F1027909].

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