Biomechanical evaluation of initial stability of a root analogue implant design with drilling protocol: A 3D finite element analysis

Ki Sun Lee, Won Chang Lee, Pan Gyu Kim, Ji Man Park, Ki Tae Koo, Jae Jun Ryu, Sang Wan Shin

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Background: The aim of this study was to biomechanically evaluate the initial stability of a patient-specific root analogue implant (RAI) design with drilling protocol by comparing it to designs without drilling protocol through a 3D finite element analysis (FEA). Methods: A 3D surface model of an RAI for the upper right incisor was constructed. To evaluate the effect of root apex drilling, four modified RAI shapes were designed with the press-fit implantation method: Non-modified, wedge added at root surface, lattice added at root surface, and apex-anchor added at root apex (AA). Each model was subjected to an oblique load of 100 N. To simulate the initial stability of implantation, contact conditions at the implant-bone interface were set to allow for the sliding phenomenon with low friction (frictional coefficient 0.1-0.5). Analysis was performed to evaluate micro-displacements of the implants and peak stress on the surrounding bones. Results: Under all low frictional coefficient conditions, the lowest von Mises stress level on the cortical bone and fewest micro-displacements of the implant were observed in the AA design. Conclusion: In view of these results, the AA design proved superior in reducing the stress concentration on the supporting cortical bone and the micro-displacement of RAI.

Original languageEnglish
Article number4104
JournalApplied Sciences (Switzerland)
Issue number12
Publication statusPublished - 2020 Jun 1

Bibliographical note

Funding Information:
Acknowledgments: This research was supported by a grant from the Korea University Ansan Hospital (O1903561).

Funding Information:
Funding: This study was supported by the Technology Innovation Program (Material parts package business) (No.20001221, Development of high strength and fatigue resistance metal and manufacturing technology for root analogue dental implants) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

Publisher Copyright:
© 2020 by the authors.


  • Finite element analysis
  • Initial stability
  • Root analogue implant

ASJC Scopus subject areas

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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