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

1 Citation (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


  • Finite element analysis
  • Initial stability
  • Root analogue implant

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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