Displacement of scan body during screw tightening: A comparative in vitro study

Jung Han Kim, Jung Han Kim, Keun Ba Da Son, Keun Ba Da Son, Kyu Bok Lee, Kyu Bok Lee, Kyu Bok Lee

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The purpose of this study was to evaluate the occurrence of displacement while tightening the screw of scan bodies, which were compared according to the material type. MATERIALS AND METHODS. Three types of scan bodies whose base regions were made up of polyether ether ketone (PEEK) material [Straumann Group, Dentium Group, and Myfit (PEEK) Group] and another scan body whose base region was made up of titanium material [Myfit (Metal) Group] were used (15 per group). The reference model was fabricated by aligning the scan body library on the central axis of the implant, and moving this position by the resin model. The screws of the scan bodies were tightened to the implant fixture with torques of 5 Ncm, 10 Ncm, and a hand tightening torque. After the application of the torque, the scan bodies were scanned using a laboratory scanner. To evaluate the vertical, horizontal, and 3-dimensional (3D) displacements, a 3D inspection software program was used. To examine the difference among groups, one-way analysis of variance and Tukey’s HSD post hoc test were used (α=.05). RESULTS. There were significant differences in 3D, vertical, and horizontal displacements among the different types of scan bodies (P<.001). There was a significantly lower displacement in the Straumann group than in the Myfit (PEEK) and Dentium groups (P<.05). CONCLUSION. The horizontal displacement in all groups was less than 10 μm. With the hand tightening torque, a high vertical displacement of over 100 μm occurred in PEEK scan bodies (Myfit and Dentium). Therefore, it is recommended to apply a tightening torque of 5 Ncm instead of a hand tightening torque.

Original languageEnglish
Pages (from-to)307-315
Number of pages9
JournalJournal of Advanced Prosthodontics
Volume12
Issue number5
DOIs
StatePublished - Oct 2020

Keywords

  • Dental implant
  • Displacement
  • Polyether ether ketone (PEEK)
  • Scan body
  • Tightening torque

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