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Three-dimensional finite element analysis of stress distribution and displacement of the maxilla following surgically assisted rapid maxillary expansion.
J Craniomaxillofac Surg. 2009 Apr; 37(3):145-54.JC

Abstract

PURPOSE

The aim of this study was to investigate the displacement and stress distributions during surgically assisted rapid maxillary expansion under different surgical conditions.

MATERIALS AND METHODS

3-dimensional finite element model of a maxilla with a Hyrax appliance was constructed and an expansion force of 6000 grams was applied using the expansion screw. According to the surgical procedures, 5 groups including a control group without surgery (Group I) were simulated. The experimental groups were as follows; Group II (Le Fort I osteotomy), Group III (Le Fort I osteotomy and paramedian osteotomy), Group IV (Le Fort I osteotomy and pterygomaxillary separation), and Group V (Le Fort I osteotomy, paramedian osteotomy, and pterygomaxillary separation).

RESULTS

Displacement of the maxilla gradually increased from Group 1 to Group 5 in all three planes of space, indicating that combination of the Le Fort I osteotomy with paramedian osteotomy and pterygomaxillary separation produce greatest displacement of the maxilla. By surgical relief, the stress exerted on anchor teeth was significantly reduced.

CONCLUSION

The results suggested that the combination of Le Fort I and paramedian osteotomy with pterygomaxillary separation is an effective procedure for increasing the expansion of the maxilla with lower side effects caused by excessive stresses around the anchor teeth.

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Authors+Show Affiliations

Han UA
Department of Craniomaxillofacial surgery, Kangnam St Mary's Hospital, Medical College, the Catholic University of Korea, Seocho-gu, Seoul, Republic of Korea.
Kim Y
No affiliation info available
Park JU
No affiliation info available

MeSH

Computer SimulationDental Stress AnalysisFinite Element AnalysisHumansImaging, Three-DimensionalMaxillaModels, AnatomicOsteotomyPalatal Expansion Technique

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

19028107

Citation

Han, Un Ae, et al. "Three-dimensional Finite Element Analysis of Stress Distribution and Displacement of the Maxilla Following Surgically Assisted Rapid Maxillary Expansion." Journal of Cranio-maxillo-facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery, vol. 37, no. 3, 2009, pp. 145-54.
Han UA, Kim Y, Park JU. Three-dimensional finite element analysis of stress distribution and displacement of the maxilla following surgically assisted rapid maxillary expansion. J Craniomaxillofac Surg. 2009;37(3):145-54.
Han, U. A., Kim, Y., & Park, J. U. (2009). Three-dimensional finite element analysis of stress distribution and displacement of the maxilla following surgically assisted rapid maxillary expansion. Journal of Cranio-maxillo-facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery, 37(3), 145-54. https://doi.org/10.1016/j.jcms.2008.10.002
Han UA, Kim Y, Park JU. Three-dimensional Finite Element Analysis of Stress Distribution and Displacement of the Maxilla Following Surgically Assisted Rapid Maxillary Expansion. J Craniomaxillofac Surg. 2009;37(3):145-54. PubMed PMID: 19028107.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Three-dimensional finite element analysis of stress distribution and displacement of the maxilla following surgically assisted rapid maxillary expansion. AU - Han,Un Ae, AU - Kim,Yoonji, AU - Park,Je Uk, Y1 - 2008/11/22/ PY - 2008/04/30/received PY - 2008/08/26/revised PY - 2008/10/06/accepted PY - 2008/11/26/pubmed PY - 2009/8/1/medline PY - 2008/11/26/entrez SP - 145 EP - 54 JF - Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery JO - J Craniomaxillofac Surg VL - 37 IS - 3 N2 - PURPOSE: The aim of this study was to investigate the displacement and stress distributions during surgically assisted rapid maxillary expansion under different surgical conditions. MATERIALS AND METHODS: 3-dimensional finite element model of a maxilla with a Hyrax appliance was constructed and an expansion force of 6000 grams was applied using the expansion screw. According to the surgical procedures, 5 groups including a control group without surgery (Group I) were simulated. The experimental groups were as follows; Group II (Le Fort I osteotomy), Group III (Le Fort I osteotomy and paramedian osteotomy), Group IV (Le Fort I osteotomy and pterygomaxillary separation), and Group V (Le Fort I osteotomy, paramedian osteotomy, and pterygomaxillary separation). RESULTS: Displacement of the maxilla gradually increased from Group 1 to Group 5 in all three planes of space, indicating that combination of the Le Fort I osteotomy with paramedian osteotomy and pterygomaxillary separation produce greatest displacement of the maxilla. By surgical relief, the stress exerted on anchor teeth was significantly reduced. CONCLUSION: The results suggested that the combination of Le Fort I and paramedian osteotomy with pterygomaxillary separation is an effective procedure for increasing the expansion of the maxilla with lower side effects caused by excessive stresses around the anchor teeth. SN - 1878-4119 UR - https://www.unboundmedicine.com/medline/citation/19028107/Three_dimensional_finite_element_analysis_of_stress_distribution_and_displacement_of_the_maxilla_following_surgically_assisted_rapid_maxillary_expansion_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1010-5182(08)00173-X DB - PRIME DP - Unbound Medicine ER -