The optimal orthodontic displacement of clear aligner for mild, moderate and severe periodontal conditions: an in vitro study in a periodontally compromised individual using the finite element model

Ma, Yanning; Li, Song

doi:10.1186/s12903-021-01474-7

Cited by 34 publications

(37 citation statements)

References 37 publications

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“…Moreover, this strain increases even more in subjects with excessively inclined anterior teeth This is a common side effect that is usually addressed during orthodontic therapy of periodontally compromised patients. To avoid the deformation of the alveolar ridge crest in these cases, Ma and Li recommend displacements of less than 0.18 mm for normal alveolar bone, 0.15 mm for 1/3 resorption, and 0.10 mm for 1/3-1/2 resorption [32].…”

Section: Discussionmentioning

confidence: 99%

Using FEM to Assess the Effect of Orthodontic Forces on Affected Periodontium

et al. 2021

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Orthodontic treatment in patients with no periodontal tissue breakdown vs. horizontal bone loss should be approached with caution even though it can bring significant benefits in terms of periodontal recovery and long-term success. We used the finite element method (FEM) to simulate various clinical scenarios regarding the periodontal involvement: healthy with no horizontal bone loss, moderate periodontal damage (33%) and severe horizontal bone loss (66%). Afterwards, forces of different magnitudes (0.25 N, 1 N, 3 N, and 5 N) were applied in order to observe the behavioral patterns. Through mathematical modeling, we recorded the maximum equivalent stresses (σ ech), the stresses on the direction of force application (σ c) and the displacements produced (f) in the whole tooth–periodontal ligament–alveolar bone complex with various degrees of periodontal damage. The magnitude of lingualization forces in the lower anterior teeth influences primarily the values of equivalent tension, then those of the tensions in the direction in which the force is applied, and lastly those of the displacement of the lower central incisor. However, in the case of the lower lateral incisor, it influences primarily the values of the tensions in the direction in which the force is applied, then those of equivalent tensions, and lastly those of displacement. Anatomical particularities should also be considered since they may contribute to increased periodontal risk in case of lingualization of the LLI compared to that of the LCI, with a potential emergence of the “wedge effect”. To minimize periodontal hazards, the orthodontic force applied on anterior teeth with affected periodontium should not exceed 1 N.

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Section: Discussionmentioning

confidence: 99%

Using FEM to Assess the Effect of Orthodontic Forces on Affected Periodontium

et al. 2021

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“…On the other hand, this treatment involves a form of tooth movement that features a predetermined “mismatch” between the aligner and the tooth. The force produced by the deformation of the appliance is transmitted to the tooth and periodontal tissues, thus causing tooth movement and tissue remodeling [ 2 ]. Over recent years, plastic aligners have been employed for mild to moderate orthodontic tooth movements [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Torque movement of the upper anterior teeth using a clear aligner in cases of extraction: a finite element study

et al. 2022

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Background Clear aligner treatment has become popular over recent years. It is necessary to identify methods by which we could avoid the bowing effect in extractions with clear aligner. The present study was to identify the appropriate method to design torque movement involving the upper anterior teeth of extraction cases, in order to maintain or improve the axis and torque of the upper anterior teeth with a clear aligner during movement and closure of the extraction space. Results As the height of the power ridge increased, the rotation angle of the upper central incisor in the sagittal direction decreased gradually and the location of the rotation center changed significantly; the rotation center moved in the apical direction and then changed to the crown side. The highest von-Mises stress of the upper central incisor root, periodontal ligaments, and alveolar bone, showed little change as the power ridge height increased. When the axial inclination of the upper central incisor was normal (U1-SN = 105°), the tendency of movement for the upper central incisor approached translation with a power ridge height of 0.7 mm (corresponding distorted angle: 5.8415). When the axial inclination of the upper central incisor was oversized (U1-SN = 110°), the axial inclination of the upper central incisor reduced to normal following completion of the anterior segment retraction with a power ridge of 0.4 mm (corresponding distorted angle: 3.4265). Conclusion Analysis indicates that pure palatal tipping movement of the upper anterior teeth is generated without torque control, thus resulting in the bowing effect. The required torque control of the upper anterior teeth with oversize axial inclination is weaker than that of the upper anterior teeth with normal axial inclination because limited torque loss is expected for oversize axial inclination teeth. Variation sensitivity of the rotation center should be considered carefully due to biological problems when designing translation of the upper anterior teeth with normal axial inclination.

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“…Orthodontic treatment is used clinically in patients with anterior tooth displacement. Orthodontic treatment has been reported to enhance the appearance and function of teeth by moving or straightening these pathological teeth [5,6]. However, few studies have shown the e ect of orthodontic treatment on anterior tooth displacement after periodontal disease.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effects of Orthodontics on Anterior Tooth Displacement in Patients

Zhang

Cai

Ruan

et al. 2022

Evidence-Based Complementary and Alternative Medicine

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Objective. The purpose of this study was to investigate the therapeutic effect of orthodontic treatment on anterior tooth displacement caused by periodontal disease. Methods. A prospective study was performed in 86 patients with anterior tooth displacement caused by periodontal disease. These patients were divided into the experimental group and the control group according to the intervention methods. For the control group, patients were treated with conventional therapy. The experimental group used straight wire orthodontic technique for orthodontic treatment on the basis of conventional treatment. Comparisons were performed between two groups in term of bleeding index, alveolar bone height, anterior tooth coverage, periodontal pocket depth, probing depth, clinical crown length, tooth root length, inflammatory cytokines levels, and orthodontic satisfaction. Results. Comparison of bleeding index, alveolar bone height, anterior tooth coverage, periodontal pocket depth, probing depth, clinical crown length, tooth root length, and inflammatory cytokines levels between two groups before treatment indicated that there were no statistical differences (all P > 0.05 ). After treatment, bleeding index, alveolar bone height, anterior tooth coverage, periodontal pocket depth, probing depth, clinical crown length, and serum levels of IL-6 and TNF-α in the experimental group were lower than those in the control group (all P < 0.05 ), while the serum level of IL-2 in the experimental group was more than that in the control group ( P < 0.05 ). Also, there was no difference for tooth root length between two groups. Moreover, compared with the control group, orthodontic satisfaction in the experimental group was significantly increased. Conclusion. The efficacy of orthodontic treatment in patients with anterior tooth displacement caused by periodontal disease is higher than that of only using conventional therapy, as it helps improve their periodontal health, alveolar bone height, clinical crown length, inflammatory factor levels, and orthodontic satisfaction of patients.

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The optimal orthodontic displacement of clear aligner for mild, moderate and severe periodontal conditions: an in vitro study in a periodontally compromised individual using the finite element model

Cited by 34 publications

References 37 publications

Using FEM to Assess the Effect of Orthodontic Forces on Affected Periodontium

Using FEM to Assess the Effect of Orthodontic Forces on Affected Periodontium

Torque movement of the upper anterior teeth using a clear aligner in cases of extraction: a finite element study

Study on the Effects of Orthodontics on Anterior Tooth Displacement in Patients

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