Scientific use of the finite element method in Orthodontics

Knop, Luégya Amorin Henriques; Gandini, Luiz Gonzaga; Shintcovsk, Ricardo Lima; Gandini, Márcia Regina Elisa Aparecida Schiavon

doi:10.1590/2176-9451.20.2.119-125.sar

Cited by 68 publications

(39 citation statements)

References 19 publications

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“…3,5 The final dental position is reached by sequential aligners worn by patient 22 h/d, which progressively reposition the teeth by small amounts. 3,5,6 Additionally, several studies demonstrated that auxiliaries such as attachments and elastics are mandatory in CAT to achieve the predicted results. 3 Tooth shape could influence the efficiency of CAT 7,8 during correction of malalignment due to the geometric interaction between teeth and aligners.…”

Section: Introductionmentioning

confidence: 98%

Clear aligner orthodontic therapy of rotated mandibular round-shaped teeth: A finite element study

Cortona¹,

Rossini

Parrini

et al. 2019

The Angle Orthodontist

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Objective: To evaluate, using the finite element method, the orthodontic rotational movement of a lower second premolar obtained with clear aligners, analyzing different staging and attachment configurations. Materials and Methods: A CAD model including a complete lower dental arch (with element 4.5 mesially rotated 308) and the corresponding periodontal ligaments, attachments, and aligner was designed and imported to finite element software. Starting from the CAD model, six projects were created to simulate the following therapeutic combinations for correcting element 4.5 position: (1) without attachments, (2) single attachment placed on the buccal surface of element 4.5, (3) three attachments placed on the buccal surfaces of teeth 4.4 to 4.6. For each project, both 1.28 and 38 of aligner activation were considered. Results: All the analyzed configurations revealed a clockwise rotation movement of element 4.5 on the horizontal plane. Models with attachments showed a greater tooth displacement pattern than models without attachments. Simulations with attachments and 38 of aligner activation exhibited the best performance concerning tooth movement but registered high stresses in the periodontal ligaments, far from the ideal stress levels able to produce tooth rotational movement. Conclusions: The model with a single attachment and 1.28 of aligner activation was the most efficient, followed by the three attachment model with the same degree of activation. Aligner activation should not exceed 1.28 to achieve better control of movement and reasonable stress in periodontal structures. (Angle Orthod. 2020;90:247-254.)

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Section: Introductionmentioning

confidence: 98%

Clear aligner orthodontic therapy of rotated mandibular round-shaped teeth: A finite element study

Cortona¹,

Rossini

Parrini

et al. 2019

The Angle Orthodontist

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“…FEA has been used to measure the stress distribution during orthodontic treatment for over two decades [9,10]. This technique involves the use of computer-aided design to calculate the biochemical system and pressure distribution as well as study the relationship between tooth movement, root resorption, and bone remodeling.…”

Section: Introductionmentioning

confidence: 99%

“…This technique involves the use of computer-aided design to calculate the biochemical system and pressure distribution as well as study the relationship between tooth movement, root resorption, and bone remodeling. Using this mathematical method, a geometric structure is simulated on a computer along with its mechanical properties [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Stress Distribution on the Upper First Molar and Alveolar Bone with the Transpalatal Arch and Upper Second Molar Using Finite Element Analysis

Pratiwi

Widayati

Purbiati

2019

Pesqui. bras. odontopediatria clín. integr.

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Objective: To evaluate the differences in the stress distribution on the upper first molar with and without transpalatal arch and a second molar when a 150 g force is applied during canine distalization using finite element analysis. Material and Methods: We constructed several models with data obtained by scanning human skulls using cone beam computed tomography. A robust three-dimensional maxillary model was then constructed by assembling the previously completed robust models of the maxilla and second molar with and without transpalatal arch, and canine distalization was simulated using a 150 g force. The data consisted of color spectrum figures representing the stress distribution. Results: For the upper first molar and its alveolar bone, there was a statistically significant difference in the stress distribution between the upper first molar with transpalatal arch, the upper first molar without transpalatal arch, and the upper first molar with transpalatal arch and a second molar as reinforcement. Conclusion: Stress distribution on the first molar and alveolar bone, indicated by the maximum and minimum principal stress, as well as the pressure von Mises, exhibited a similar pattern. The highest amount of stress was observed in the model of the first molar without transpalatal arch, followed by the model of the first molar with transpalatal arch and, finally, the model of the first molar with transpalatal arch and a second molar.

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“…On the extent of structural engineering, the use of the finite element method (FEM) means to set up a condition of tension and deformation of an arbitrary-geometry solid submitted to external actions. 11 Fine element analysis (FEA) is a numeric analytical method that permits the calculation of stresses and displacements. 12 FEM is nearly similar to the clinical situation; however, the qualitative behavior of a dry skull doesn't mimic with a high level of exactness in the clinical circumstance.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Three-Dimensional Finite Element Study of Two Space Regainers in the Mixed Dentition Stage

et al. 2020

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ObjectivesThis study aims to compare the stress distribution and displacement that resulted from the use of a Gerber space regainer and sagittal distalizer using three-dimensional finite element analysis. Materials and Methods Three-dimensional simulated models of the appliances were developed using a software. The forces applied by the two appliances were 3N (tipping) and 15N (bodily), respectively. Displacement and von Mises stress on the compact and cancellous bone, periodontal ligament (PDL), crowns of the mandibular first, second permanent molars, and deciduous canines were calculated. Stress distribution and displacement values were measured via linear static analysis. Results Gerber space regainer showed greater displacement than that produced by the sagittal distalizer at the first permanent molar. However, such displacement was less at the other tested points when compared with that delivered by sagittal distalizer. The stresses created by Gerber appliance were higher in the crown and PDL of the deciduous canine than the crown of the first permanent molar crown. Conclusions Gerber appliance generates more distal force and less stress concentration on the crown of the mandibular first permanent molar than that created by the sagittal distalizer. On the other hand, stress concentrations produced by Gerber space regainer are found to be more on the crown and PDL of the deciduous canine. Therefore, it can be concluded that the use of Gerber appliance needs more anchorage. AbstractKeywords ► mixed dentition ► finite element analysis ► stress distribution

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Scientific use of the finite element method in Orthodontics

Cited by 68 publications

References 19 publications

Clear aligner orthodontic therapy of rotated mandibular round-shaped teeth: A finite element study

Clear aligner orthodontic therapy of rotated mandibular round-shaped teeth: A finite element study

Simulation of Stress Distribution on the Upper First Molar and Alveolar Bone with the Transpalatal Arch and Upper Second Molar Using Finite Element Analysis

A Comparative Three-Dimensional Finite Element Study of Two Space Regainers in the Mixed Dentition Stage

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