Finite element analysis of stress caused by palatal orthodontic anchor screws

Atsuko Hotta, Yasuki Uchida, Yasuhiro Namura, Mizuki Inaba, Mitsuru Motoyoshi

Research output: Contribution to journalArticlepeer-review


This study used finite element (FE) analysis to investigate the stability of miniscrews (screws) placed at the median palate. FE models with variable suture maturity and screw-suture distances were used to examine the relationship with screw stability. Four groups were classified by extent of maturation of the midpalatal suture (0%, 60%, 75%, and 100%). The placement position was set at the center of the suture (0.0 mm), or 0.5, 1.0, and 1.5 mm to the side of the suture, and von Mises stress values in bone and screw displacement were compared among models. The stress value for the unsutured model, in which the screw was placed at the center of the suture, was greater than 30 MPa. Stress values for models in which screws were placed to the side (0.5-1.5 mm) were less than 28 MPa. Maximum screw displacement was greater in the 0.0-mm incomplete suture model than at other placement positions. Because bone conditions vary among patients, placement position and suture maturation should be examined on cone beam-computed tomography images, to ensure screw stability.

Original languageEnglish
Article numberjosnusd/19-0088
Pages (from-to)318-321
Number of pages4
JournalJournal of Oral Science
Issue number3
Publication statusPublished - Jul 2020


  • Finite element method
  • Midpalatal suture
  • Miniscrew
  • Screw-suture distance
  • Suture ratio

Cite this