Flexural strength of various kinds of the resin bridges fabricated with 3D printing

3D 프린팅으로 제작된 여러 종류의 레진브릿지의 굴곡강도에 대한 연구

  • Park, Sang-Mo (Department of Prosthodontics & Dental Research Institute, Seoul National University) ;
  • Kim, Seong-Kyun (Department of Prosthodontics & Dental Research Institute, Seoul National University) ;
  • Park, Ji-Man (Department of Prosthodontics, Yonsei University) ;
  • Kim, Jang-Hyun (Department of Prosthodontics, Yonsei University) ;
  • Jeon, Yoon-Tae (Aekyung Chemical Co.) ;
  • Koak, Jai-Young (Department of Prosthodontics & Dental Research Institute, Seoul National University)
  • 박상모 (서울대학교 치과보철학과 치과보철학 및 치의학연구실) ;
  • 김성균 (서울대학교 치과보철학과 치과보철학 및 치의학연구실) ;
  • 박지만 (연세대학교 치과보철학과) ;
  • 김장현 (연세대학교 치과보철학과) ;
  • 전윤태 (애경화학(주)) ;
  • 곽재영 (서울대학교 치과보철학과 치과보철학 및 치의학연구실)
  • Received : 2017.09.22
  • Accepted : 2017.10.18
  • Published : 2017.12.30


Purpose: Manufacturing with AM (Additive manufacturing) technique has many advantages; but, due to insufficient study in the area, it is not being widely used in the general clinic. In this study, differences of flexural strength among various materials of 3 unit fixed dental prosthesis were analyzed. Materials and Methods: A metal jig for specimens that had a 3-unit-fixed dental prosthesis figure were fabricated. The jigs were made appropriately to the specifications of the specimens. Three different kinds of materials of specimens which were NC (mathacrylic esther based), DP-1 (Bisphenol A epoxy acrylate type oligomer based), and DT-1 (urethane acrylate based) were printed with DLP machine. Five specimens for each kind of material were printed with an angle of $30^{\circ}$ from the horizontal surface. The specimens were placed on the jig and the flexural strength was measured and recorded using Universal testing machine. The recorded data was analyzed in SPSS using One-way ANOVA and Tukey HSD to determine the significance of the differences of flexural strength among the groups. Results: The flexural strengths of each group were the followings: NC, $1119{\pm}305$ N; DP-1, $619{\pm}150$ N; DT-1, $413{\pm}65N$. Using One-way ANOVA and Tukey Honestly Significant Difference test, significant difference was found between NC and the other groups (P < 0.05), but there was no significant difference between DP-1 and DT-1 (P > 0.05). Conclusion: Higher flexural strength was shown in 3-unit-fixed dental prosthesis that were 3D printed using a DLP machine with NC material.


3D print;flexural strength;digital light-processing printer;3 unit-fixed dental prosthesis;additive manufacturing


Supported by : SNUDH


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