Displacement and stress distribution of the maxilla under different surgical conditions in three typical models with bon
- PDF / 1,598,490 Bytes
- 10 Pages / 612.419 x 808.052 pts Page_size
- 29 Downloads / 185 Views
ORIGINAL ARTICLE
Displacement and stress distribution of the maxilla under different surgical conditions in three typical models with bone-borne distraction: a three-dimensional finite element analysis Yang Shi1,2 · Chao-ning Zhu3 · Zhijian Xie1,2 Received: 28 May 2019 / Accepted: 17 January 2020 © Springer Medizin Verlag GmbH, ein Teil von Springer Nature 2020
Abstract Objective The present study compared the skeletal effects of surgically assisted rapid maxillary expansion (SARME) with different surgeries in three representative finite element (FE) models. Study design According to the ossification level of midpalatal suture, three FE models, with different elasticity moduli of sutures (E = 1 MPa, 500 MPa, and 13,700 MPa) were constructed, to represent three age groups of patients. Within each model, four groups were set up according to different surgeries: group I (control group without surgery), II (paramedian osteotomy), III (pterygomaxillary separation), and IV (paramedian osteotomy and pterygomaxillary separation). An expansion force of 100 N and 1 mm displacement were applied via a bone-borne distraction to simulate the expansion process. Results By analyzing these models, the maximum displacement of maxilla was observed in group IV, with E = 1 MPa model exhibiting the most displacement (28.5 × 10–6 mm), followed by group II (21.4 × 10–6 mm). Group IV showed a unique backward–downward rotation with minimum stress distributions in three models (9 MPa, 131 MPa, and 140 MPa, respectively), and group II exhibited comparable low stress distributions (12 MPa, 151 MPa, and 230 MPa, respectively). Lowest stress was found in E = 1 MPa model, compared with the other two models. Conclusion There is no need to perform surgeries when the midpalatal suture is open, and surgery guidelines are the same for partial and complete fusion sutures. Furthermore, exclusive use of partial paramedian osteotomy is sufficient enough to reduce stress and expand the posterior part of maxilla, and it is less invasive.
Keywords Minimally invasive osteotomy · Surgically assisted rapid maxillary expansion · Finite element analysis · Palatal expansion technique · Orthodontics, corrective
Zhijian Xie
[email protected] 1
Department of Oral and Maxillofacial Surgery, The Affiliated Stomatology Hospital, Zhejiang University School of Medicine, No. 395, Yan’an Rd, 310003 Hangzhou, China
2
Key Laboratory of Oral Biomedical Research of Zhejiang Province, Zhejiang University, 310003 Hangzhou, China
3
State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, 310058 Hangzhou, China
K
Y. Shi et al.
Verschiebung und Spannungsverteilung des Oberkiefers unter verschiedenen chirurgischen Bedingungen in drei typischen Modellen mit knochengetragener Distraktion: eine dreidimensionale Finite-Elemente-Analyse Zusammenfassung Zielsetzung In der vorgelegten Studie wurden die skelettalen Auswirkungen der chirurgisch unterstützten schnellen Expansion des Oberkiefers („surgically assisted rapid
Data Loading...
