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2020 Vol.24, Issue 2 Preview Page

Original Article

Investigation of Optimal Cement Space in 3D Printed 3-unit Resin Prosthesis: A Pilot Study
Gae-jun Jang1
,
Seong-Kyun Kim2*
,
Seong-Joo Heo2
,
Jai-Young Koak2
,
Ji-Man Park3
1Graduate Student, Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University
2Professor, Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University
3Associate Professor, Department of Prosthodontics, Yonsei University College of Dentistry
*Corresponding Author
30 June 2020. pp. 62-75
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Abstract

Purpose: The purpose of this study was to investigate the optimal cement space in the 3D printed 3-unit resin fixed partial denture.

Materials and Methods: A model was fabricated for mandibular premolar and molar implant abutments. Forty resin prostheses were fabricated using stereolithography (SLA) 3D printer. A cement space of 90 µm (CS 90) was given for 20 specimens and a cement space of 100 µm (CS 100) was given for 20 specimens. The groups of each cement space were divided into 10 groups by a layer thickness (50 µm and 100 µm) and a build orientation (0°, 30°, 45°, 60° and 90°). The prostheses were seated and scanned with micro-CT. Marginal, axial and occlusal gaps were measured and statistically analyzed using Kruskal-Wallis and Mann-Whitney U test (α = .05).

Results: In CS 90 groups, marginal gap (MG) value was 88.43 ± 41.77 µm, mid axial gap (AX) value was 92.74 ± 58.43 µm, axio-occlusal angle gap (AN) value was 80.49 ± 56.97 µm and occlusal gap (OC) value was 166.75 ± 52.38 µm. In CS 100 groups, MG value was 69.12 ± 40.17 µm, AX value was 113.43 ± 64.20 µm, AN value was 92.99 ± 55.73 µm and OC value was 161.79 ± 50.40 µm. In CS 100 group, MG showed smaller value in comparison to CS 90 group (p < .05).

Conclusion: For the SLA 3D printed 3-unit resin fixed partial denture, setting the cement space to 90 µm or less is not recommended due to the interference in seating.

Keywords
Dental Prosthesis
Cement Space
Micro-CT
3D Printing
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Information
  • Publisher :The Korean Academy of Oral & Maxillofacial Implantology
  • Publisher(Ko) :대한구강악안면임플란트학회
  • Journal Title :Implantology
  • Journal Title(Ko) :대한구강악안면임플란트학회지
  • Volume : 24
  • No :2
  • Pages :62-75
  • Received Date : 2020-04-03
  • Revised Date : 2020-05-11
  • Accepted Date : 2020-05-12
  • DOI :https://doi.org/10.32542/implantology.202007
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