Effect of geometric dimensions and material models of the periodontal ligament in orthodontic tooth movement

Shokrani, Parvaneh; Hashemi, Ata; Shirin, Mehdi Bostan; Oskui, Iman Z.

doi:10.1111/ocr.12381

Cited by 8 publications

(5 citation statements)

References 35 publications

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“…Studies indicated that initial tooth movement is highly dependent on the mechanical properties of the PDL ( Middleton et al, 1996 ; Bourauel et al, 1999 ; Qian et al, 2008 ). Based on linear elastic models, tooth displacements have generally been overstated when compared to non-linear elastic models ( Shokrani et al, 2020 ). Non-linear mechanical properties of PDL substantially alters predicted biomechanical outcomes, not only the predicted displacements but also the stress or strain distribution ( Hohmann et al, 2011 ).…”

Section: Discussionmentioning

confidence: 99%

Biomechanical factors in the open gingival embrasure region during the intrusion of mandibular incisors: A new model through finite element analysis

Zhang

Gao

Wang

et al. 2023

Front. Bioeng. Biotechnol.

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Introduction: Open gingival embrasure (OGE) is a common complication in adults following clear aligner therapy and the influence of gingival or alveolar bone biotype on OGE is of great concern. Unfortunately, due to the limited number of patients with clearaligner therapy and the clinical methods to distinguish the gingival biotype of patients being invasive, it is difficult to carry out clinical studies on the gingival or alveolar bone biotype of the OGE. In the meanwhile, the detailed biomechanics of the occurrence of OGE remains unknown. The goal of this study was to establish a new model to simulate the virtual space region, namely, the OGE region, to investigate the relationship between alveolar bone biotype and the occurrence of OGE, and explore potential biomechanical factors related to OGE.Methods: The OGE region in the interproximal space was established using a filler with a very low modulus of elasticity (1 × 10−6 MPa). To illustrate the biomechanics of OGE more exhaustively, a line was created at the top of the alveolar crest along the proximal tooth root. FEA was then used to analyze the biomechanics of the surrounding tissues, the OGE region and the line at the top of the alveolar crest along the proximal tooth root of the central incisor under two different labial bone thicknesses (thick and thin) with an axial inclination of 80°, 90° and 100°.Results: During intrusion of the incisors in clear aligner therapy, as inclination increased or bone tissue became thinner, the stress in the surrounding tissues [tooth root, alveolar crest, and periodontal ligament (PDL)] was greater. In the OGE region and interproximal alveolar crest, the strain increased with increasing inclination and labial bone thinning. The results from the line at the top of the alveolar crest along the proximal tooth root showed more detailed biomechanics: In all groups, stress and strain were focused on the mesial-labial alveolar crest. Interestingly, our results also demonstrated that when OGE occurs, other complications may arise, including root resorption and bone dehiscence.

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Section: Discussionmentioning

confidence: 99%

Biomechanical factors in the open gingival embrasure region during the intrusion of mandibular incisors: A new model through finite element analysis

Zhang

Gao

Wang

et al. 2023

Front. Bioeng. Biotechnol.

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“…The geometry of a natural tooth is an important factor in conducting a thorough FE analysis. The tooth root diameter, root length, PDL thickness and material properties influence the response of the TPBC to mechanical loading 62 . For example, the centre of resistance ( a point through which a tooth moves without rotation when the load is applied ) and centre of rotation ( a point about which tooth rotation happens ) 26 may be used in orthodontic treatment planning.…”

Section: Discussionmentioning

confidence: 99%

“…The tooth root diameter, root length, PDL thickness and material properties influence the response of the TPBC to mechanical loading. 62 For example, the centre of resistance (a point through which a tooth moves without rotation when the load is applied) and centre of rotation (a point about which tooth rotation happens) 26 may be used in orthodontic treatment planning. To locate the centre of resistance, an iterative non-linear FE analysis has been performed along with a further investigation for the optimal force at a required point to start OTM from hydrostatic stress thresholds in the PDL.…”

Section: Ta B L E 1 (Continued)mentioning

confidence: 99%

Modelling and evaluating periodontal ligament mechanical behaviour and properties: A scoping review of current approaches and limitations

Ovy

Romanyk

Flores-Mir

et al. 2021

Orthod Craniofacial Res

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A natural human tooth consists of enamel, dentin, pulp and cementum, and its root structure is surrounded by the periodontal ligament (PDL) (Figure 1). The PDL is a soft, highly vascular and specialized connective tissue that surrounds the tooth root and attaches it to the alveolar bone. 1,2 The main components of the PDL are functionoriented elastic fibres, tissue-containing cells (eg, fibroblasts, osteoclasts, osteoblasts, cementoblasts, mastocytes and macrophages), blood and lymphatic vessels, and nerves that are connected to the tooth pulp, the tooth socket, and the gingiva. 3,4 It consists of 53%-74% collagen fibres, 1%-2% blood vessels and nerve endings, rooted

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“…Concerning the modeling procedure, we utilized simplified average model. Creating the simplified average model does not need much labor and time that are required in modeling based on CT images [31]. In addition, the simplified average model can generalize and evaluate the loading condition without considering numerous varieties of the teeth owing to tooth wear [28] or occlusal trauma [32] that were caused by anterior open bite.…”

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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Effect of geometric dimensions and material models of the periodontal ligament in orthodontic tooth movement

Cited by 8 publications

References 35 publications

Biomechanical factors in the open gingival embrasure region during the intrusion of mandibular incisors: A new model through finite element analysis

Biomechanical factors in the open gingival embrasure region during the intrusion of mandibular incisors: A new model through finite element analysis

Modelling and evaluating periodontal ligament mechanical behaviour and properties: A scoping review of current approaches and limitations

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

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