Evaluations of miniscrew type-dependent mechanical stability

Cheol Min Han, Keiichiro Watanabe, Andrea E. Tsatalis, Damian Lee, Fengyuan Zheng, Hee Moon Kyung, Toru Deguchi, Do Gyoon Kim

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Background: Miniscrew has been widely used as an absolute anchorage in orthodontic treatment. Types of miniscrew with different diameter, length, shape, and thread dimensions may have a substantial effect on mechanical stability of the miniscrew system. Thus, the objective of this study was to evaluate miniscrew type-dependent mechanical stability to assess mechanical properties of miniscrew systems in various thickness of artificial bone block using different measurement tools. Methods: Two types of miniscrews (15 Tomas and 15 AbsoAnchor) were placed in artificial bone block with different thickness of 1.5, 2.0, 3.0 mm. Values of maximum insertion torque, removal torque, Periotest, implant stability quotient, static stiffness, dynamic stiffness, and energy dissipation ability were assessed for each miniscrew system. Findings: The maximum insertion torque, removal torque, implant stability quotient, static and dynamic stiffness values significantly increased when the miniscrews were placed in thicker bone block while Periotest values decreased. The static stiffness, Periotest and implant stability quotient values were significantly correlated each other and also with other mechanical properties (p < 0.001) except tan δ (p > 0.35). However, the slopes of some correlations and absolute values of measurement were significantly different dependent on the miniscrew types (p < 0.025). Interpretation: The current findings suggest that miniscrew type-dependent calibrations are required to estimate mechanical stability of the miniscrew systems despite the utilization of same measurement tool.

Original languageEnglish (US)
Pages (from-to)21-27
Number of pages7
JournalClinical Biomechanics
StatePublished - Oct 2019
Externally publishedYes

Bibliographical note

Funding Information:
The project described here was supported by American Association of Orthodontists Foundation Award (Deguchi, T) and seed grants of the College of Dentistry, OSU (Kim, D-G).

Publisher Copyright:
© 2019 Elsevier Ltd


  • Implant stability quotient
  • Miniscrew
  • Periotest
  • Primary stability
  • Stiffness


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