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Evaluation of Stress Distribution in Resorbable Screw Fixation System: Three-Dimensional Finite Element Analysis of Mandibular Setback Surgery With Bilateral Sagittal Split Ramus Osteotomy

Cited 13 time in Web of Science Cited 14 time in Scopus
Authors
Choi, Jae-Pyong; Baek, Seung-Hak; Choi, Jin-Young
Issue Date
2010-07
Publisher
LIPPINCOTT WILLIAMS & WILKINS
Citation
JOURNAL OF CRANIOFACIAL SURGERY; Vol.21, No.4, pp.1104-1109
Keywords
Finite element analysisresorbable screwbicortical fixationbilateral sagittal split ramus osteotomy
Abstract
The purpose of this study was to evaluate the stress distribution of resorbable screw (RS) and cortical/cancellous bone in the mandibular setback surgery with bilateral sagittal split ramus osteotomy (BSSRO) according to fixation geometry and number of RSs using three-dimensional finite element analysis. Three-dimensional virtual models of the mandible and bicortical RS (INION CPS System; diameter, 2.5 mm; length, 12 mm [Inion Ltd, Tampere, Finland]) were constructed by Mimics (Materialise, Ann Arbor, MI) using three-dimensional computed tomography DICOM data with 0.5-mm-thickness cut. After 8-mm setback BSSRO was performed, fixation between the proximal and distal segments of the mandible was done with bicortical RS. Fixation options were classified into 3RL (3 RSs with linear configuration at the retromolar area), 2R1A (2 RSs at the retromolar area and 1 RS at the mandibular angle area), 2R1B (2 RSs at the retromolar area and 1 RS at the mandibular body area), and 3R1A (3 RSs at the retromolar area and 1 RS at the mandibular angle area). After applying the occlusal load of 132 N on the lower first molar, stress distributions of the RSs and cortical/cancellous bone in each option were analyzed by ANSYS program (ANSYS Inc, Canonsburg, PA). Maximum stress concentration was found at the anterior RS fixation in the retromolar area in all options. Although 3R1A fixation showed more even distribution of stress concentration than other fixation options, 2R1A fixation was comparable with 3R1A fixation in view of yield stress in RSs. In terms of fixation geometry and number of RSs, both 2R1A and 3R1A fixation configurations might provide proper stress distribution in BSSRO.
ISSN
1049-2275
Language
English
URI
http://hdl.handle.net/10371/80430
DOI
https://doi.org/10.1097/SCS.0b013e3181e1b449
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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