期刊
JOURNAL OF CRANIOFACIAL SURGERY
卷 32, 期 8, 页码 2621-2625出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/SCS.0000000000007805
关键词
Distraction osteogenesis; finite element analysis; hemifacial microsomia
类别
This study compared the stress distribution and bone displacement effects of intraoral and extraoral distractors in mandibular distraction through finite element analysis. The results showed that the intraoral system caused lower stress in the mandibular bone compared to the extraoral system, with higher stress concentration on the fixing screws. Overall, it is recommended to use intraoral distractors in general situations due to their stress shielding effect and lower displacement, while external devices are advised for longer distraction distances with lower stresses.
The Aim of the Study: Finite element analysis of the stresses subjected to both the intraoral and the extraoral distractors devices used in the mandibular distraction of hemifacial microsomia patients. Methodology: Two models were included in the current study. The first model was an extraoral distractor and the second model was an intraoral distractor model. To generate the results in the simulated models; 2 vertical loads were applied (222.7 and 137.78 N) on the defective and normal side, respectively. Results: The intraoral system observed lower stress (6.85 MPa) in the mandibular bone compared to the extraoral system (13.21 MPa). The intraoral distractor had a higher stress concentration on the distractor fixing screws (352 MPa) compared to the extraoral distractor fixing pins (15 MPa). The extraoral distractor had a higher displacement effect on the mandibular bone around the pins of 263.35 mu m in comparison to the intraoral distractor effect which was 77.87 mu m. Conclusions: Internal oral distractor provides a sort of stress shielding to the distracted bone and less displacement, so it is more advisable to be used in general. The external devices are advised only in extralong distraction distance because the distractor is subjected to lower stresses compared to intraoral counterparts.
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