A new orthodontic force system for moment control utilizing the flexibility of common wires: Evaluation of the effect of contractile force and hook length

Lai, Wei‐Jen; Midorikawa, Yoshiyuki; Kanno, Zuisei; Takemura, Hiroshi; Suga, Kazuhiro; Soga, Kohei; Ono, Takashi; Uo, Motohiro

doi:10.1016/j.jfma.2017.03.002

Cited by 16 publications

(8 citation statements)

References 28 publications

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“…To ensure identical starting treatment times on both sides, the canine retraction was commenced after completion of the alignment and levelling stage 31,32 . A retraction force of 150 g was used; however, application of excessive force could lead to many complications, such as root resorption 33 . The above‐mentioned force is recommended as the optimal force for the highest potential canine retraction 34…”

Section: Discussionmentioning

confidence: 99%

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Three‐dimensional assessment of accelerating orthodontic tooth movement—micro‐osteoperforations vs piezocision: A randomized, parallel‐group and split‐mouth controlled clinical trial

Alqadasi

Xia

Alhammadi

et al. 2020

Orthod Craniofacial Res

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Objective: To compare the effects of micro-osteoperforations (MOPs) vs piezocision (Piezo) in accelerating orthodontic tooth movement in adults. Setting and Sample Population:In this randomized, single-blinded, parallel-group, split-mouth clinical trial, 24 patients aged 15-40 years were recruited.Subjects and Methods: Patients were randomly allocated into two groups: MOPs and Piezo groups. One side of the maxilla was allocated randomly for treatment with one of these techniques, and the other side was treated conventionally to act as a split-mouth control. The rate of canine retraction was evaluated up to 3 months by three-dimensional digital models using a conventional labial appliance. Root resorption and bone height were evaluated using cone beam computed tomography. Results:The MOPs and Piezo groups showed a significantly higher rate of tooth movement after 3 months on the experimental sides than the control sides.However, the net movements in the MOPs and Piezo groups did not reveal a higher rate of tooth movement. Similarly, the overall net movement was −0.32 ± 1.14 and -0.55 ± 0.89 mm for MOPs and Piezo, respectively (P = .606). Regarding root resorption, the overall changes in intra-or intergroup comparisons were insignificant.Decreased canine palatal bone height was reported on the experimental side of the Piezo group (P = .015) after 3 months, but the overall changes were insignificant. Conclusions:The effect of MOPs and Piezo techniques in accelerating the orthodontic canine retraction was comparable to each other, and to the conventional methods.Neither technique caused root resorption or increased vertical bone loss.

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Section: Discussionmentioning

confidence: 99%

“…31,32 A retraction force of 150 g was used; however, application of excessive force could lead to many complications, such as root resorption. 33 The above-mentioned force is recommended as the optimal force for the highest potential canine retraction. 34…”

Section: Clinical Relevance Of the Accelerated Tooth Movementmentioning

confidence: 99%

Three‐dimensional assessment of accelerating orthodontic tooth movement—micro‐osteoperforations vs piezocision: A randomized, parallel‐group and split‐mouth controlled clinical trial

Alqadasi

Xia

Alhammadi

et al. 2020

Orthod Craniofacial Res

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“…However, due to differences in experimental conditions, including bracket types, ligation methods, and archwire shapes, the results should be interpreted with caution. Because there are anatomical differences in the thickness and shape of PDL space between these model teeth and real teeth,29 it is necessary to improve the experimental design, and to provide a more sophisticated 3D model30 that resolves these limitations in further studies. In addition, it is necessary to improve the typodont design via incorporation of 3D sensors for measuring forces and moments along 6 axes in future studies 29…”

Section: Discussionmentioning

confidence: 99%

In-vitro investigation of the mechanical friction properties of a computer-aided design and computer-aided manufacturing lingual bracket system under diverse tooth displacement condition

Kim¹,

Cho

et al. 2019

Korean J Orthod

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ObjectiveThe purpose of this study was to compare the static (SFF) and kinetic frictional forces (KFF) of a computer-aided design and computer-aided manufacturing lingual bracket (CAD/CAM-LB) with those of conventional LB (Con-LB) and Con-LB with narrow bracket width (Con-LB-NBW) under 3 tooth displacement conditions.MethodsThe samples were divided into 9 groups according to combinations of 3 LB types (CAD/CAM-LB [Incognito], Con-LB [7th Generation, 7G], and Con-LB-NBW [STb]) with 3 displacement conditions (no displacement [control], maxillary right lateral incisor with 1-mm palatal displacement [MXLI-PD], and maxillary right canine with 1-mm gingival displacement [MXC-GD]; n = 6/group). While drawing a 0.016-inch copper or super-elastic nickel-titanium archwire with 0.5 mm/min for 5 minutes in a chamber maintained at 36.5℃, SFF and KFF were measured. The Kruskal-Wallis method with Bonferroni correction was performed.ResultsThe Incognito group demonstrated the highest SFF, followed by the 7G and STb groups ([STb-control, STb-MXLI-PD, Stb-MXC-GD] < [7G-MXC-GD, 7G-MXLI-PD, 7G-control] < [Incognito-MXLI-PD, Incognito-control, Incognito-MXC-GD]; p < 0.001). However, there were no significant differences in SFF among the 3 displacement conditions within each bracket group. Within each displacement condition, the Incognito group demonstrated the highest KFF, followed by the 7G and STb groups ([STb-control, STb-MXLI-PD] < Stb-MXC-GD < 7G-MXLI-PD < [7G-control, 7G-MXC-GD] < [7G-MXC-GD, Incognito-MXLI-PD, Incognito-control] < [Incognito-control, Incognito-MXC-GD]; p < 0.001). MXC-GD exhibited higher KFFs than MXLI-PD in the same bracket group.ConclusionsThe slot design and ligation method of the CAD/CAM-LB system should be modified to reduce SFF and KFF during the leveling/alignment stage.

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“…Lai et al made a dental model with resin and simulated the temperature of the oral environment with a heating rod in 2018. Based on this, a force analysis system for the archwire was established [31]. Scholars have analyzed and measured the orthodontic force by means of experimental simulation and mechanical analysis through the discussion of research status.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimentation of the Unidirectional Orthodontic Force of Second Sequential Loop Orthodontic Archwire

Jiang

Chen

Wang

et al. 2020

Applied Bionics and Biomechanics

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The abnormal tooth arrangement is one of the most common clinical features of malocclusion which is mainly caused by the tooth root compression malformation. The second sequential loop is mostly used for the adjusting of the abnormal tooth arrangement. Now, the shape devise of orthodontic archwire depends completely on the doctor’s experience and patients’ feedback, this practice is time-consuming, and the treatment effect is unstable. The orthodontic-force of the different parameters of the second sequence loop, including different cross-sectional parameters, material parameters, and characteristic parameters, was compared and simulated for the abnormal condition of root compression deformity. In this paper, the analysis and experimental study on the unidirectional orthodontic-force were carried out. The different parameters of the second sequential loop are analyzed, and the equivalent beam deflection theory is used to analyze the relationship between orthodontic-force and archwire parameters. Based on the structural analysis of the second sequential loop, the device for measuring orthodontic force has been designed. The orthodontic force with different structural characteristics of archwire was compared and was measured. Finally, the correction factor was developed in the unidirectional orthodontic-force forecasting model to eliminate the influence of inherent error. The average relative error rate of the theoretical results of the unidirectional orthodontic-force forecasting model is between 12.6% and 8.75%, which verifies the accuracy of the prediction model.

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A new orthodontic force system for moment control utilizing the flexibility of common wires: Evaluation of the effect of contractile force and hook length

Abstract: The system acted similar to an off-center V-bend and can be applied in clinical practice as an unconventional loop design. We suggest that this force system has the potential for second-order moment control in clinical applications.

Cited by 16 publications

References 28 publications

Three‐dimensional assessment of accelerating orthodontic tooth movement—micro‐osteoperforations vs piezocision: A randomized, parallel‐group and split‐mouth controlled clinical trial

Three‐dimensional assessment of accelerating orthodontic tooth movement—micro‐osteoperforations vs piezocision: A randomized, parallel‐group and split‐mouth controlled clinical trial

In-vitro investigation of the mechanical friction properties of a computer-aided design and computer-aided manufacturing lingual bracket system under diverse tooth displacement condition

Modeling and Experimentation of the Unidirectional Orthodontic Force of Second Sequential Loop Orthodontic Archwire

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