Abstract
The objective of the research was to evaluate the distribution of stress produced by surgically assisted rapid maxillary expansion in the maxillary structures using the bone-supported expander device by the Finite Element Method. Material and methods: A three- dimensional model was simulated for surgery with a LeFort I osteotomy with pterygomaxillary disjunction using a bone-supported device model for the 1mm aperture. The results showed a greater opening of the maxilla in the anterior region and a smaller opening in the posterior region. The tension forces showed mainly in all the palatine face and the posterior alveolar bone and tuber, as well as in the epilating zygomatic region above the osteotomy. The stress showed little dissipation for the roots of the molar. The forces of compression were manifested in the pterygoid process and the zygomatic pillar adjacent to the osteotomies, as well as in the expander areas of contact with the palatine bone. The analysis showed that the most stressed part is the rod connecting the device module to the support platform. Conclusion: The resulting tension stresses transmitted to the alveolar bone of the teeth adjacent to the appliance did not seem to be sufficient to displace the teeth.
Highlights
Assisted Rapid Maxillary Expansion (SARME) is an alternative for the treatment of transverse maxillary deficiency
Some studies have evaluated the effects of SARPE by comparing models of studies of individuals submitted to SARPE in the pre and postoperative period and its effects on inclination, rotation and movement of teeth in the maxillary arch (Chung et al, 2003; Seeberger et al, 2010; Kilic et al, 2013)
Because of its characteristics and properties, the finite element method (FEM) has been one of the tools used by some authors to assist in the analysis of the behavior of craniofacial structures of individuals with skeletal facial deformities when submitted to surgically assisted rapid maxillary expansion, especially with respect to the comparison between different surgical techniques and the types of expanders (Jafari et al, 2003; Shetty et al, 2009; Boryor et al, 2010; Gonçales, 2011; de Assis et al, 2014)
Summary
Assisted Rapid Maxillary Expansion (SARME) is an alternative for the treatment of transverse maxillary deficiency In this modality, after surgery, the main points of maxillary reinforcement are removed, the expansive movement is performed gradually by dento-supported, dento-muco-supported, implanto-supported or osseo-supported with effects on the craniofacial skeleton that go beyond the simple uncrossing of the arches (Bishara et al, 1987; Bays et al, 1992; Babacan et al., 2006; Gonçales et al, 2007; de Assis et al, 2011; Assis et al, 2013). Because of its characteristics and properties, the finite element method (FEM) has been one of the tools used by some authors to assist in the analysis of the behavior of craniofacial structures of individuals with skeletal facial deformities when submitted to surgically assisted rapid maxillary expansion, especially with respect to the comparison between different surgical techniques and the types of expanders (Jafari et al, 2003; Shetty et al, 2009; Boryor et al, 2010; Gonçales, 2011; de Assis et al, 2014)
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