Determination of stress distribution on periodontal ligament and alveolar bone by various tooth movements – A 3D FEM study

Gupta, Mayank; Madhok, Kriti; Kulshrestha, Rohit; Chain, Stephen; Kaur, Harmeet; Yadav, Adarshika

doi:10.1016/j.jobcr.2020.10.011

Cited by 36 publications

(48 citation statements)

References 23 publications

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“…Even though in all three scenarios the force magnitude was the same (1 N), the biomechanical behavior of the tooth was different due to the contrasting periodontal status: intact, moderate, and severe periodontal breakdown. Our results were similar to those found in the literature that considered orthodontic tooth movement on an intact desmodontium and observed that the stresses were concentrated in the apical root area in the case of the application of a purely intrusive, extrusive, or rotational force [25][26][27][28]. For the tipping movement, the main stress area was situated at the alveolar crest while for bodily movement, it was throughout the desmodontium [25].…”

Section: Discussionsupporting

confidence: 89%

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: Discussionsupporting

confidence: 89%

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

et al. 2021

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“…This characteristic was similar to the result of vertical displacement. Gupta et al [39] described that intrusion caused larger stress on PDL than tipping movement when the load magnitude was same. Thus, the stress on the PDL might be affected by vertical displacement.…”

Section: Discussionmentioning

confidence: 99%

Optimization of Loading Condition for Maxillary Molar Intrusion with Midpalatal Miniscrews by Using Finite Element Analysis

et al. 2021

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An anterior open bite is one of the most difficult malocclusions in orthodontic treatment. For such malocclusion, orthodontic miniscrew insertion into both buccal and palatal alveolar regions has been indicated for molar intrusion, but it involves a risk of tooth root injury. To solve the problem, a midpalatal miniscrew-attached extension arm (MMEA) is adopted. However, this method causes palatal tipping of the molar because intrusive loads were applied only from the palatal side. Currently, a transpalatal arch is added to avoi0d tipping movement, but it induces the patient’s discomfort. Hence, the objective of this study was to evaluate the loading conditions for maxillary molar intrusion without tipping movement, only by MMEA through finite element (FE) analysis. FE models of maxillary right first molar and surrounding tissues were created. Three hook positions of MMEA were set at 6.0 mm perpendicular intervals in the occluso-apical direction along the mucosal contour. An intrusive unit load was applied from the palatal side of the molar, and various counter loads were applied from the buccal side. An optimal counter load for molar intrusion without palatal tipping was observed in each hook position. In conclusion, an ideal maxillary molar intrusion can be achieved only by MMEA with an optimal counter load.

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“…However, the accuracy of the results mainly depended on the accuracy of the modeling process in nite element researches [29].After combining the results of stress magnitudes and directions, Viecilli et al [30] concluded that the periodontal membrane was the initiating site of the force transmission, neglecting the presence of the periodontal membrane would lead to the inappropriate model simpli cation. Schmidt et al [31] suggested a simpli ed modeling approach using uniform and consistent periodontal membrane layers, linear material properties for carrying out nite element researches to generate representative reference data, so the experiment integrated previous research outcomes and reconstructed periodontal membranes with 0.2mm thicknesses [32][33] on the root surfaces. As the joints of bones, the bone sutures could absorb and transmit transient mechanical stresses resulting from natural activities or applied actions externally [34].…”

Section: Discussionmentioning

confidence: 99%

“…The model was then imported into Geomagic Studio, and further repaired, smoothed, nely modeled in planes and curved surfaces to obtain the model in .step (Standard for the Exchange of Product Model Data) , as shown in Fig. 5b, the root surfaces of the maxillary teeth were expanded outward by 0.2 mm [32][33], the original alveolar sockets of the teeth were tted to generate the periodontal ligaments of the tooth root surfaces by Boolean operations. The maxillary teeth, the periodontal ligaments and the craniomaxillofacial bone were imported into Siemens NX for assembly to obtain the 3D(Threedimensional) CAD(Computer Aided Design)model in .prt, as shown in Fig.…”

Section: Equipment and Softwaresmentioning

confidence: 99%

Three-dimensional Finite Element Analysis of the Effect of Alveolar Cleft Bone Graft on the Maxillofacial Biomechanical Stabilities of Unilateral Complete Cleft Lip and Palate

Tian

Huang

Shi

et al. 2021

Preprint

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Background: The objective was to clarify the effect of alveolar cleft bone graft on maxillofacial biomechanical stabilities, the key areas when bone grafting and in which should be supplemented with bone graft once bone resorption occurred in UCCLP (Unilateral Complete Cleft Lip and Palate).Methods: Maxillofacial CAD (Computer Aided Design) models of non-bone graft and full maxilla cleft, full alveolar cleft bone graft, bone graft in other sites of the alveolar cleft were acquired by processing the UCCLP maxillofacial CT data in three-dimensional modeling softwares. The maxillofacial bone equivalent (EQV) stresses and bone suture EQV strains under occlusal states were obtained in the finite element analysis software.Results: Under corresponding occlusal states, the EQV stresses of maxilla, pterygoid process of sphenoid bone on the corresponding side and anterior alveolar arch on the non-cleft side were higher than other maxillofacial bones, the EQV strains of nasomaxillary, zygomaticomaxillary and pterygomaxillary suture on the corresponding side were higher than other maxillofacial bone sutures. The mean EQV strains of nasal raphe, the maximum EQV stresses of posterior alveolar arch on the non-cleft side, the mean and maximum EQV strains of nasomaxillary suture on the non-cleft side in full alveolar cleft bone graft model were all significantly lower than those in non-bone graft model. The mean EQV stresses of bilateral anterior alveolar arches, the maximum EQV stresses of maxilla and its alveolar arch on the cleft side in the model with bone graft in lower 1/3 of the alveolar cleft were significantly higher than those in full alveolar cleft bone graft model.Conclusions: For UCCLP, bilateral maxillae, pterygoid processes of sphenoid bones and nasomaxillary, zygomaticomaxillary, pterygomaxillary sutures, anterior alveolar arch on the non-cleft side are the main occlusal load bearing structures before and after alveolar cleft bone graft. Alveolar cleft bone graft mainly affects biomechanical stabilities of nasal raphe and posterior alveolar arch, nasomaxillary suture on the non-cleft side. The areas near nasal floor and in the middle of the alveolar cleft are the key sites when bone grafting, and should be supplemented with bone graft when the bone resorbed in these areas.

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Determination of stress distribution on periodontal ligament and alveolar bone by various tooth movements – A 3D FEM study

Cited by 36 publications

References 23 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

Optimization of Loading Condition for Maxillary Molar Intrusion with Midpalatal Miniscrews by Using Finite Element Analysis

Three-dimensional Finite Element Analysis of the Effect of Alveolar Cleft Bone Graft on the Maxillofacial Biomechanical Stabilities of Unilateral Complete Cleft Lip and Palate

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