Research paper: The three-dimensional mechanical response of orthodontic archwires and brackets in vitro during simulated orthodontic torque

Tran, Bill; Nobes, David S.; Major, Paul W.; Carey, Jason P.; Romanyk, Dan L.

doi:10.1016/j.jmbbm.2020.104196

Cited by 9 publications

(8 citation statements)

References 17 publications

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“…In line with previous literature, torque transmission was higher for steel arch wires than for TMA arch wires. Reasons for this may be the different E-moduli and/or the different flexural strengths [49,50].…”

Section: Discussionmentioning

confidence: 99%

Precision of slot widths and torque transmission of in-office 3D printed brackets

et al. 2023

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Purpose To investigate a novel in-office three-dimensionally (3D) printed polymer bracket regarding slot precision and torque transmission. Methods Based on a 0.022″ bracket system, stereolithography was used to manufacture brackets (N = 30) from a high-performance polymer that met Medical Device Regulation (MDR) IIa requirements. Conventional metal and ceramic brackets were used for comparison. Slot precision was determined using calibrated plug gages. Torque transmission was measured after artificial aging. Palatal and vestibular crown torques were measured from 0 to 20° using titanium–molybdenum (T) and stainless steel (S) wires (0.019″ × 0.025″) in a biomechanical experimental setup. The Kruskal–Wallis test with post hoc test (Dunn–Bonferroni) was used for statistical analyses (significance level p < 0.05). Results The slot sizes of all three bracket groups were within the tolerance range according to DIN 13996 (ceramic [C]: 0.581 ± 0.003 mm; metal [M]: 0.6 ± 0.005 mm; polymer [P]: 0.581 ± 0.010 mm). The maximum torque values of all bracket–arch combinations were above the clinically relevant range of 5–20 Nmm (PS: 30 ± 8.6 Nmm; PT: 27.8 ± 14.2 Nmm; CS: 24 ± 5.6 Nmm; CT: 19.9 ± 3.8 Nmm; MS: 21.4 ± 6.7 Nmm; MT: 16.7 ± 4.6 Nmm). Conclusions The novel, in-office manufactured polymer bracket showed comparable results to established bracket materials regarding slot precision and torque transmission. Given its high individualization possibilities as well as enabling an entire in-house supply chain, the novel polymer brackets bear high potential of future usage for orthodontic appliances.

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Section: Discussionmentioning

confidence: 99%

Precision of slot widths and torque transmission of in-office 3D printed brackets

et al. 2023

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“…This approach is associated with high precision, and thus adapt to different types of complex structures with different properties. The nite element method uses its calculated support conditions and mechanical loading mode to simulate complex mouth-jaw motion system with simple problems, and the model has repeatability [15]. This model is suitable for use in oral biomechanics research.…”

Section: Introductionmentioning

confidence: 99%

“…Finite element analysis involves quantitative evaluation and intuitive and correct image expression and analysis, allowing to evaluate orthodontic force involved in initial tooth displacement, associated size and direction of teeth, tooth root and periodontal membrane characteristics, as well as alveolar bone properties under stress and strain, and periodontal membrane hydrostatic pressure values. It allows to analyze tooth movement trends and to assess the risk of periodontal membrane necrosis and root resorption [15,16].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of a four-curve auxiliary arch at preventing maxillary central incisor linguoclination during orthodontic treatment: A finite element analysis

Yang

Bai

Zhang

et al. 2022

Preprint

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Background The correct torque of the incisors helps assess the effect of orthodontic treatment; however, evaluating it effectively remains a challenge. Improper anterior teeth torque angle can cause cortical bone fracture and root exposure. Methods A three-dimensional finite element model of the maxillary central incisor torque controlled by a self-made four-curvature auxiliary arch was established, And the experiments were divided to simulate four different group: (1) molar ligation group ; (2) micro-implant ligation group; (3) molar retraction group ༛(4) micro-implant retraction group༛and the retracted traction force was set at 1.15 N. The displacement of the maxillary dentition and periodontal ligament stress values were analyzed with different torque forces (0.5 N, 1 N, 1.5 N, 2 N) placed on the incisors. Results Provided the absence of a tooth extraction gap, when the four-curvature auxiliary arch was used in conjunction with absolute anchorage, the recommended force value was of < 1.5 N. when maxillary central incisor retraction, a force value of < 1 N was recommended. In the case of no-implant anchorage, whether there is tooth extraction gap or not, the recommended force value was of < 1 N. The stress on the other teeth did not exceed the value of that on the periodontal ligament. The effect of using the four-curvature on the incisors was significant. Conclusions The proposed approach may help improve treatment maxillary central incisor for poor torque and avoid cortical bone fracture and root exposure

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“…Regarding the comparison of different bracket/rectangular wire combinations, Daratsianos et al (2016) and Tran et al (2021) compared the torque capabilities of SS and β-Ti rectangular wires combined with labial and/or lingual appliances [8,24]. These investigators were driven by the fact that rectangular wires of the specific alloys are indicated as finishing wires when effective torque control is needed.…”

Section: Introductionmentioning

confidence: 99%

Vertical and Orovestibular Forces Generated by Beta-Titanium and Stainless-Steel Rectangular Wires in Labial and Fully Customized Lingual Bracket Systems

et al. 2021

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This study aimed to investigate the force values exerted from rectangular wires when combined with conventional labial and fully customized lingual appliances under predefined, idealized activation. Fully customized lingual brackets of two brands Incognito™ (3M Unitek, Monrovia, MN, USA) and WIN (DW Lingual Systems, Bad Essen, Germany) and labial brackets of another brand, discovery® MIM and discovery® smart systems (Dentaurum, Ispringen, Germany), were chosen. Stainless-steel and beta-titanium wires of 0.018” × 0.025” were examined. For IncognitoTM, 0.0182” × 0.025” beta-titanium wires were tested. Intrusion/extrusion and orovestibular movements were performed in a range of 0.2 mm, and the forces were recorded for each 0.1 mm of the movement. Mean values and standard deviations were calculated for all measurements, and ANOVA was performed for statistical analysis. Slight differences were observed between the forces generated from beta-titanium and stainless-steel wires. The same wire generated in some cases 5–53% higher forces with the lingual appliance due to the vertical orientation of the long walls during intrusion/extrusion and increased wire stiffness at the anterior region. Beta-titanium and stainless-steel 0.018” × 0.025” wires can generate similar force values during the final stages of the orthodontic therapy; thus, possibly only one of the two alloys could be used in each orthodontic wire sequence.

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Research paper: The three-dimensional mechanical response of orthodontic archwires and brackets in vitro during simulated orthodontic torque

Cited by 9 publications

References 17 publications

Precision of slot widths and torque transmission of in-office 3D printed brackets

Precision of slot widths and torque transmission of in-office 3D printed brackets

Efficacy of a four-curve auxiliary arch at preventing maxillary central incisor linguoclination during orthodontic treatment: A finite element analysis

Vertical and Orovestibular Forces Generated by Beta-Titanium and Stainless-Steel Rectangular Wires in Labial and Fully Customized Lingual Bracket Systems

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