Biomechanical influence of anchorages on orthodontic space closing mechanics by sliding method

Zhan, Lihua; Sun, Tinghui; Fan, Yubo

doi:10.1007/s11517-020-02149-1

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…All patients were treated with pre-adjusted MBT appliances using 0.022″ × 0.028″ slot brackets (3 M Unitek, Monrovia, CA, USA). To reduce sliding friction, the second molars were not bonded until extraction space closure [ 16 ]. After the initial alignment, miniscrews 1.7 mm in diameter and 8.0 mm in length (Ortho Easy, Forestadent, Pforzheim, Germany) were placed in the interradicular area between the second premolars and maxillary first molars, at 8 mm above the arch wire; all procedures were performed by the same operator.…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional evaluation of maxillary tooth movement in extraction patients with three different miniscrew anchorage systems: a randomized controlled trial

Zhang

Guo

et al. 2022

Prog Orthod.

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Objective To compare the three-dimensional (3-D) movement of maxillary teeth in response to three common miniscrew anchorage systems in extraction patients with maxillary dentoalveolar protrusion. Materials and methods The study employed a randomized controlled single-blinded design with three arms. Thirty extraction patients who required maximum anchorage to retract maxillary anterior teeth were included and randomly allocated into three treatment groups: space closure with direct miniscrew anchorage and low crimpable hooks (DL group), indirect miniscrew anchorage and low crimpable hooks (IL group), and direct miniscrew anchorage and high crimpable hooks (DH group). Cone beam computed tomography (CBCT) images of all included patients were obtained immediately before (T0) and after (T1) space closure. The outcomes were 3-D positional changes of maxillary central incisor, lateral incisor, canine, second premolar, and first molar. The repeated measures analysis of variance with post hoc LSD test was used to evaluate differences among groups. Results A significant intrusion (− 1.34 mm; 95% CI, − 1.60 mm, 1.08 mm) and buccal (− 6.92°; 95% CI, − 8.67°, − 5.13°) and distal (4.90°; 95% CI, 3.75°, 6.04°) inclination of the maxillary first molars were observed in the DL group, compared to the other two groups. The mesial movement (− 0.40 mm; 95% CI, − 0.83 mm, − 0.03 mm) of the maxillary first molars was found in the IL group, while the DL (0.44 mm; 95% CI, 0.15 mm, 0.73 mm) and IL (0.62 mm; 95% CI, 0.28 mm, 0.96 mm) groups exhibited distal movement. In the DH group, the lingual inclination changes of maxillary central incisor (5.04°; 95% CI, 2.82°, 7.26°) were significantly lower, which is indicative of good lingual root torque control of the maxillary anterior teeth. Conclusion Three miniscrew anchorage systems produced significantly different 3-D maxillary tooth movement. The maxillary first molars were significantly buccally and distally inclined and intruded in patients using direct miniscrew anchorages with low crimpable hooks. Direct miniscrew anchorages with high crimpable hooks could help to achieve better lingual root torque control of the maxillary incisors. Trial registration The trial was registered at www.chictr.org.cn (ChiCTR1900026960). Registered 27 October 2019.

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Section: Methodsmentioning

confidence: 99%

Three-dimensional evaluation of maxillary tooth movement in extraction patients with three different miniscrew anchorage systems: a randomized controlled trial

Zhang

Guo

et al. 2022

Prog Orthod.

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“…In this study, a certain distributed point on the occlusal surface of each tooth was selected for concentrate loading [ 17 ], and the chewing cycle was simplified to vertical loading and oblique loading. Under loading conditions, the edge of the mandible was fixed to prevent the jaw from displacement in the X, Y and Z directions [ 13 , 15 ] (Fig. 3 ).…”

Section: Methodsmentioning

confidence: 99%

“…All materials were considered linear-elastic, isotropic and homogeneous [10][11][12][13][14][15][16]. The applied material properties (elastic modulus and Poisson's ratio) were obtained from the literature (Table 2).…”

Section: Experimental Preset Conditionsmentioning

confidence: 99%

“…Different teeth play diverse roles in chewing function, same loading was applied to the teeth of same region. Therefore, the loading of 100 N, 50 N and 25 N were Enamel 41.000 0.300 [11,[14][15][16] Root canal pulp 0.020 0.450 [11,[14][15][16] loaded on the occlusal surfaces of molars, premolars, and anterior teeth, respectively [10]. In this study, a certain distributed point on the occlusal surface of each tooth was selected for concentrate loading [17], and the chewing cycle was simplified to vertical loading and oblique loading.…”

Section: Loading Forcementioning

confidence: 99%

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Timing selection for loosened tooth fixation based on degree of alveolar bone resorption: a finite element analysis

Hao

et al. 2022

BMC Oral Health

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Objective This study aimed to evaluate timing of fixation to retard bone absorption using finite element analysis(FEA). Methods Volunteer CT images were used to construct four models of mandibles with varying degrees of alveolar bone resorption. By simulating occlusal force loading, biomechanical analysis was made on the periodontal membrane, tooth root and surrounding bone (both cancellous and cortical) of mandibular dentition. Results The von Mises stress value of the periodontal structures was positively related with the degree of alveolar bone resorption, and the von Mises stress at the interface between the periodontal membrane and tooth root was increased significantly in moderate to severe periodontitis models. The von Mises stress at the interface between the periodontal cortical bone and cancellous bone was increased significantly in the severe periodontitis model. And the von Mises stress value with oblique loading showed significantly higher than vertical loading. Conclusion Teeth with moderate to severe periodontitis, loosened tooth fixation can be used to retard bone absorption.

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“…In addition, they present high fracture resistance and low propensity to osseointegration due to the grade V titanium alloy (Ti-6AI-4V) which they are made from [12]. The mini orthodontic implant was also considered an option to obtain maximum anchorage during anchorage loss [13].…”

Section: Introductionmentioning

confidence: 99%

Stress distribution in lower second molar mesialization using mini-implants: a pilot study using 3D finite element analysis

et al. 2023

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Objective: to analyze the stress distribution in a 3D model that simulates second molar mesialization using two different types of mini-implants. Material and Methods: a mandible bone model was obtained by recomposing a computed tomography performed by a software program. The cortical and trabecular bone, a lower second molar, periodontal ligament, orthodontic tube, resin cement and the mini-implants were designed and modeled using the Rhinoceros 4.0 software program. The characteristics of self-drilling orthodontic mini-implants were: one with 7 mm length, 1 mm transmucosal neck section and 1.6 mm diameter and another with 5 mm length and 1.5 mm diameter. A total of 235.161 and 224.505 elements were used for the mesh. These models were inserted into the bone block and then subjected to loads of 200 cN (centinewton). The results were calculated and analyzed by the Ansys 17.0 software program for qualitative verification through displacement and maximum principal stress maps. Results: it was possible to observe that the periodontal ligament presented low displacement and stress values. However, the physiological values presented are among those capable to provide orthodontic movement, with compression and tensile area visualization staggered between 0.1 and -0.1 MPa (megapascal). Conclusion: within the limitations of the study, the mini-implants tested showed similar results where the load on the tooth allowed dental displacement (molar mesialization), with a tendency to rotate it, theoretically allowing the second molar to take the location of the first molar. KEYWORDSFinite element analysis; Orthodontic anchorage procedures; Fixed orthodontic appliances; Mini dental implants; Tooth dislocation. RESUMOObjetivo: analisar a distribuição de tensões em um modelo 3D que simula a mesialização do segundo molar usando dois tipos diferentes de mini-implantes. Material e Métodos: um modelo de osso mandibular foi obtido por recomposição de uma tomografia computadorizada realizada por um software. O osso cortical e trabecular, um segundo molar inferior, ligamento periodontal, tubo ortodôntico, cimento resinoso e os mini-implantes foram projetados e modelados no software Rhinoceros 4.0. As características dos mini-implantes ortodônticos auto perfurantes foram: um com 7 mm de comprimento, 1 mm de secção transmucosa e 1,6 mm de diâmetro e outro com 5 mm de

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Biomechanical influence of anchorages on orthodontic space closing mechanics by sliding method

Cited by 9 publications

References 33 publications

Three-dimensional evaluation of maxillary tooth movement in extraction patients with three different miniscrew anchorage systems: a randomized controlled trial

Three-dimensional evaluation of maxillary tooth movement in extraction patients with three different miniscrew anchorage systems: a randomized controlled trial

Timing selection for loosened tooth fixation based on degree of alveolar bone resorption: a finite element analysis

Stress distribution in lower second molar mesialization using mini-implants: a pilot study using 3D finite element analysis

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