Three-dimensional effects in retraction appliance design

Raboud, Don; Faulkner, M.G.; Lipsett, A.W.; Haberstock, D.

doi:10.1016/s0889-5406(97)70046-5

Cited by 38 publications

(34 citation statements)

References 13 publications

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“…Occlusal plane No movement in the occlusal plane is predicted for this spring, according to the graph in Figure 5a and the M/F ratios for this plane found in the literature (Raboud et al, 1997). …”

Section: Discussionsupporting

confidence: 58%

“…According to Raboud et al (1997), dental movements in the sagittal plane can be classified as follows:…”

Section: Discussionmentioning

confidence: 99%

“…Satisfactory analysis of an orthodontic spring requires the observation of various parameters, including the center of resistance (C res ) and center of rotation (C rot ) (Raboud et al, 1997). A single force applied at the C res results in translation in the direction of that force.…”

Section: Introductionmentioning

confidence: 99%

“…Examples of FEM applications include dental implant research (Guan et al, 2011); orthodontic open-coil spring force analysis (Fraunhofer et al, 1993); orthodontic device design based on resultant forces and moments (Ferreira et al, 2008); dentomaxillofacial structural analysis using 3D model analysis of segmented T-loop spring behavior (Lotti et al, 2006); numerical nonlinear analysis of orthodontic springs (Raboud et al, 1997); analysis of the effects of anterior retraction loop position on the forces produced and applied on canines in L-loops (Geramy et al, 2012); study of the intensity and direction of three-dimensional forces in orthodontic wire (Fotos et al, 1987); and other designs and analyses of orthodontic springs (Chen et al, 2010;De Franco et al, 1976;Hutton, 2004;Kojima and Fukui, 2012). …”

Section: Introductionmentioning

confidence: 99%

“…The aim of this study was to perform a comprehensive numerical analysis for a delta retraction spring and to determine the resultant forces and moments in the three axes (x, y, z), as well as the M/F ratio for the occlusal plane, as presented in the literature for T-loop orthodontic springs (Raboud et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional analysis of an orthodontic delta spring

Rodrigues

Borges

Luersen

et al. 2014

Rev. Bras. Eng. Bioméd.

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Introduction: The purpose of this study was to analyze the force system, moment-force ratios (M/F) and vonMises stresses in an orthodontic delta spring using a 3D fi nite element model. The M/F ratio produced by an orthodontic spring is related to the different types of tooth movement that are likely to occur in the sagittal and occlusal planes. Methods: Analyses were performed using a 3D fi nite element model, and a data acquisition system was used to validate the numerical results. Results: Reactive forces between 0.0 and 2.0 N were observed along the x-axis, while null values were observed along the y-and z-axes. The maximum activation that ensured geometric stability and mechanical stresses below the elastic limit of the material was 10.0 mm. Conclusions:The results indicate that a delta spring can provide (i) uncontrolled tipping for activation of less than 1.0 mm; (ii) controlled counterclockwise tipping for activation between 1.0 and 4.5 mm; (iii) translation for activation between 4.5 and 5.0 mm; and (iv) controlled clockwise tipping in the sagittal plane for activation between 5.0 and 10.0 mm. No tooth movement was observed in the occlusal plane for the M/F ratios observed.

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Section: Discussionsupporting

confidence: 58%

“…According to Raboud et al (1997), dental movements in the sagittal plane can be classified as follows:…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Three-dimensional analysis of an orthodontic delta spring

Rodrigues

Borges

Luersen

et al. 2014

Rev. Bras. Eng. Bioméd.

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Three-dimensional finite element analysis of the mechanical stress on root from orthodontic tooth movement by sliding mechanics

Ping

Mao

Zhou

et al. 2007

J. Huazhong Univ. Sci. Technol. [Med. Sci.]

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In order to study mechanical stress on root from orthodontic tooth movement by sliding mechanics, a 3-dimensional finite element model incorporating all layers of a human mandibular dental arch with orthodontic appliance has been developed to simulate mechanical stress on root from the orthodontic tooth movement. Simulated orthodontic force of 2 N at 0, 30 and 45 degree from the horizontal axis was applied to the crown of the teeth. The finite element analysis showed when orthodontic forces were applied to the tooth, the stress was mainly concentrated at the neck of the tooth decreasing uniformly to the apex and crown. The highest stress on the root was 0.621 N/mm(2) for cervical margin of the canine, and 0.114 N/mm(2) for apical region of the canine. The top of canine crown showed the largest amount of displacement (2.417 microm), while the lowest amount of displacement was located at the apical region of canine (0.043 microm). In conclusion, this model might enable one to simulate orthodontic tooth movements clinically. Sliding force at 2 N is ideal to ensure the bodily orthodontic tooth movement. The highest stress concentration in the roots was always localized at the cervical margin when orthodontic force of 2 N at 0, 30 and 45 degree from the horizontal axis, so there may be the same risk of root resorption when orthodontic force of 2 N at 0, 30 and 45 degree was used in clinic cases.

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