Adaquate fixation of plates for stability during mandibular reconstruction

Akiko Kimura, Tomohisa Nagasao, Tsuyoshi Kaneko, Tamotsu Tamaki, Junpei Miyamoto, Tatsuo Nakajima

研究成果: Article査読

49 被引用数 (Scopus)

抄録

Purpose: To determine the most appropriate plate fixation for dispersing the stress around screws in mandibular reconstruction. Material and methods: Forty-eight three-dimensional reconstructed mandibular models with Central (C) or right Lateral (L) defects were created and divided into three groups, fixed with: (1) two screws on each side, (2) three screws on the left side with the third (middle one) located distally, or (3) three screws on the left side with the third (middle one) located proximally. A 300 N vertical load was applied to the left molar region. The maximum stress was calculated using a finite element method and statistically evaluated. Results: Stress was concentrated around the screw at the distal end of the mandibular halves on the loaded side ('crucial screw'). For the C defect, stress concentrated around the 'crucial screw' was greater when there were only two screws for fixation (20.55 MPa) than when there were three screws (16.17 MPa; p = 0.022). No significant difference was found between the two groups with three screws for fixation. For the L defect on the other hand, stress on the 'crucial screw' was relatively greater when there were three screws for fixation (18.9 MPa) than when there were only two screws for (12.83 MPa; p = 0.051). No significant difference was found between the two groups with three screws for fixation. As for the reconstruction plate, the stresses on the plates were not different among the various screw groups for fixation nor among the C and L defects. Conclusion: This paradoxical result is explained by plate bowing. Thus in large defects screw positions should take into consideration the potential for plate bowing.

本文言語English
ページ(範囲)193-200
ページ数8
ジャーナルJournal of Cranio-Maxillofacial Surgery
34
4
DOI
出版ステータスPublished - 2006 6 1

ASJC Scopus subject areas

  • 外科
  • 口腔外科
  • 耳鼻咽喉科学

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