Three-dimensional finite-element analysis of a central lower incisor under labial and lingual loads

Lombardo, Luca; Stefanoni, Filippo; Mollica, Francesco; Laura, Attoresi; Scuzzo, Giuseppe

doi:10.1016/j.pio.2011.10.005

Cited by 34 publications

(23 citation statements)

References 15 publications

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“…Liang et al [ 16 ] concluded in their study that applying a combination of labial retraction and intrusive force accompanying a counterclockwise moment to a maxillary incisor resulted in true intrusion. In the other study, Lombardo et al [ 25 ] mentioned that applying labial intrusive force to a mandibular incisor generated labial tipping, but the usage of lingual intrusive force was more effective.…”

Section: Discussionmentioning

confidence: 99%

Effects of crown-root angle on stress distribution in the maxillary central incisors’ PDL during application of intrusive and retraction forces: a three-dimensional finite element analysis

Heravi

Salari²,

Tanbakuchi

et al. 2013

Prog Orthod.

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BackgroundDifferent crown-root angulations of maxillary central incisors can be assumed as a potential reason for many underscored outcomes of orthodontic treatments. The aim of this study was to determine the effects of the different crown-root angles on stress distributions in the maxillary central incisor’s periodontal ligament (PDL) during application of intrusive and retraction forces using a 3D finite element method.MethodsTwo models of a maxillary central incisor were constructed using ANSYS software: the first one with an angle of 166.7° (as a sample of the maxillary central incisor in a class II, division 2 patient) and the other one with an angle of 173.4° (normal angulation). Each of the samples was loaded twice by an intrusive force (0.25 N) and a retraction force (0.5 N) through the ideal position of brackets.ResultsFEM results showed little difference between stress distributions in the two models during intrusion (ten thousandth) compared to retraction (thousandth). In the application of retraction force, the stress concentration on the curved tooth was less than the other.ConclusionTo produce similar patterns of stress in the PDL, orthodontists can apply 1.18 times heavier retraction forces on the maxillary central incisors in class II, division 2 patients compared to class I patients.

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Section: Discussionmentioning

confidence: 99%

Effects of crown-root angle on stress distribution in the maxillary central incisors’ PDL during application of intrusive and retraction forces: a three-dimensional finite element analysis

Heravi

Salari²,

Tanbakuchi

et al. 2013

Prog Orthod.

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“…Orthodontic forces represent a major inducing factor for tooth movement. Such forces are produced by orthodontic appliances and exert on the tooth crown, with the forces transferring to surrounding periodontal tissues through the tooth body, triggering tissue remodeling after cushioning and absorbtion by the periodontal ligament (PDL) (Kim et al, 2010;Lombardo et al, 2012). The magnitude of the forces is crucial (Hohmann et al, 2007;Rohan et al, 2015), where oversized forces may lead to root resorption, or even tooth exfoliation in the worst case scenario.…”

Section: Introductionmentioning

confidence: 99%

A biomechanical case study on the optimal orthodontic force on the maxillary canine tooth based on finite element analysis

Liu

Peng

et al. 2018

J. Zhejiang Univ. Sci. B

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Excessive forces may cause root resorption and insufficient forces would introduce no effect in orthodontics. The objective of this study was to investigate the optimal orthodontic forces on a maxillary canine, using hydrostatic stress and logarithmic strain of the periodontal ligament (PDL) as indicators. Finite element models of a maxillary canine and surrounding tissues were developed. Distal translation/tipping forces, labial translation/tipping forces, and extrusion forces ranging from 0 to 300 g (100 g=0.98 N) were applied to the canine, as well as the force moment around the canine long axis ranging from 0 to 300 g·mm. The stress/strain of the PDL was quantified by nonlinear finite element analysis, and an absolute stress range between 0.47 kPa (capillary pressure) and 12.8 kPa (80% of human systolic blood pressure) was considered to be optimal, whereas an absolute strain exceeding 0.24% (80% of peak strain during canine maximal moving velocity) was considered optimal strain. The stress/strain distributions within the PDL were acquired for various canine movements, and the optimal orthodontic forces were calculated. As a result the optimal tipping forces (40-44 g for distal-direction and 28-32 g for labial-direction) were smaller than the translation forces (130-137 g for distal-direction and 110-124 g for labial-direction). In addition, the optimal forces for labial-direction motion (110-124 g for translation and 28-32 g for tipping) were smaller than those for distal-direction motion (130-137 g for translation and 40-44 g for tipping). Compared with previous results, the force interval was smaller than before and was therefore more conducive to the guidance of clinical treatment. The finite element analysis results provide new insights into orthodontic biomechanics and could help to optimize orthodontic treatment plans.

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“…The superior intrusion mechanics of lingual force application is also a factor. 6,7,12,13 The operator should ensure full expression of the 0.01660.022-inch nickel-titanium archwire before proceeding to the rectangular steel 'working' archwire. Often re-ligation of this wire for a further visit is adequate.…”

Section: Managing the Alignment Phasementioning

confidence: 99%

Extraction treatment in lingual orthodontics

Lawson¹

2013

Journal of Orthodontics

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Three-dimensional finite-element analysis of a central lower incisor under labial and lingual loads

Cited by 34 publications

References 15 publications

Effects of crown-root angle on stress distribution in the maxillary central incisors’ PDL during application of intrusive and retraction forces: a three-dimensional finite element analysis

Effects of crown-root angle on stress distribution in the maxillary central incisors’ PDL during application of intrusive and retraction forces: a three-dimensional finite element analysis

A biomechanical case study on the optimal orthodontic force on the maxillary canine tooth based on finite element analysis

Extraction treatment in lingual orthodontics

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