Numeric modeling of torque capabilities of self-ligating and conventional brackets

Huang, Yue; Keilig, Ludger; Rahimi, Arash; Reimann, Susanne; Eliades, Theodore; Jäger, Andreas; Bourauel, Christoph

doi:10.1016/j.ajodo.2009.04.018

Cited by 56 publications

(51 citation statements)

References 20 publications

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“…24 In a 0.022-inch slot, the engagement angle for a 0.018 3 0.025-inch SS could be as high as 18u, 1 leaving the 17u pretorque for U1 in the MBT system 17 practically useless. On the other hand, a change of the archwire size from 0.018 3 0.025 inches to 0.019 3 0.025 inches will increase the torque moment by 125%, 3 and if a 0.021 3 0.025-inch SS is used in a 0.022-inch slot, the engagement angle might be only about 6u. 1 From this point of view, the bidimensional approach might be an advisable solution to the ineffective expression of pretorque due to the unmatched size of archwire and slot.…”

Section: Discussionmentioning

confidence: 99%

“…1 Great efforts have been made to investigate torque expression in both conventional [2][3][4][5] and selfligating 2,3,6,7 brackets, using the finite element method, 3,5 optical image correlation technique, 4 or some special apparatuses. 2,6,7 In the clinic, in addition to individual twisting of rectangular wire, numerous torturing auxiliaries, 8 such as Art spring and Warren spring, have been engaged for torque control.…”

Section: Introductionmentioning

confidence: 99%

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Bidimensional techniques for stronger anterior torque control in extraction cases

Liu¹,

Tang²,

Zhang³

et al. 2012

The Angle Orthodontist

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Objective: To investigate the capacity of bidimensional techniques for torque control of anterior teeth in extraction cases. Materials and Methods: Two different bidimensional techniques were distinguished by nomenclature as bidimensional-slot (bDS) and bidimensional-wire (bDW), respectively. (1) In the clinical study, patients were randomly assigned to three groups (ie, bDS [n 5 27], bDW [n 5 24], and control [n 5 25] groups). The major inclusion criterion was mild crowding in the upper arch, with the two upper first premolars (teeth 14 and 24) to be extracted. After space closure through standardized treatment, the torque of the upper central incisors (%TQ _U1) was calculated using the angle formed by the base of the U1 bracket and the working archwire on cephalograms. (2) In the typodont study, a standardized setup of the upper dentition with teeth 14 and 24 extracted was established. The spaces were closed through water bath followed by elastics, using the bDW or the conventional (control) technique, respectively. In six replicate experiments, after space closure, the %TQ _U1 was measured on the standardized lateral photographs. Results: (1) In the clinical study, after space closure, the %TQ_U1 was 9.4u 6 3.4u (bDS), 8.3u 6 3.3u (bDW), and 5.8u 6 2.9u (control), respectively. The %TQ_U1 of bDS and bDW were both significantly (P , .05) larger than that of the control, but no statistical difference was found between them. (2) In the typodont study, after space closure, the %TQ_U1 of bDW (8.5u 6 0.9u) was significantly (P , .01) larger than that of the control (4.9u 6 1.0u). Conclusion: The bDS and the bDW techniques may help enhance anterior torque control in extraction cases. (Angle Orthod. 2012;82:715-722.)

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bidimensional techniques for stronger anterior torque control in extraction cases

Liu¹,

Tang²,

Zhang³

et al. 2012

The Angle Orthodontist

View full text Add to dashboard Cite

show abstract

“…Deformasi permanen terjadi kemungkinan karena proses pembuatan braket dengan brazing sehingga, penyatuan komponen basis braket dan sayap braket yang tidak baik dan komposisi logam pembentuk braket. [12][13][14][15] Komposisi logam pembentuk braket yang mempengaruhi sifat mekanik dan fisik braket merupakan faktor terbesar dalam terjadinya deformasi braket. Komposisi material logam braket 3M adalah austenitik AISI tipe 303, braket Ormco tipe AISI 17-4 PH, dan Versadent adalah austenitik.…”

Section: Pembahasanunclassified

Deformasi Slot Beberapa Produk Braket Stainless Steel Akibat Gaya Torque Kawat Beta Titanium

Huda

Siregar

Ismah

2013

Majalah Kedokteran Gigi Indonesia

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ABSTRAKDeformasi slot braket Stainless Steel akan mempengaruhi gaya yang diaplikasikan kepada gigi.Tujuan penelitian adalah untuk mengetahui deformasi slot braket dari lima merek braket yaitu 3M, Biom, Versadent, Ormco dan Shinye akibat gaya torque kawat Beta Titanium 0.021x0.025 inci dengan sudut puntir 45° dan besar gaya torque dengan sudut puntir 30° dan 45°. Penelitian juga bertujuan untuk membandingkan deformasi dan besar gaya torque antara kelima merek braket. Penelitian dilakukan pada 50 braket Stainless Steel Edgewise dari lima kelompok merek braket (n=10) dilem ke akrilik. Masing-masing braket dilakukan dua tahapan pengukuran yaitu pengukuran deformasi braket dengan menghitung rerata tinggi slot braket dengan mikroskop stereoskopi sebelum dan sesudah uji torque dan pengukuran besar gaya torque dengan alat uji torque. Hasil analisa statistik menunjukkan terdapat deformasi slot braket pada kelima merek braket dengan deformasi permanen secara klinis pada braket Biom (2,79 µm) dan Shinye (2,29 µm). Besar gaya torque pada kelima braket dari yang paling besar yaitu 3M, Ormco, Versadent, Shinye dan Biom. Perbandingan deformasi slot braket dan besar gaya torque antara kelima braket adalah terdapat perbedaan deformasi slot braket antara kelima merek braket kecuali antara 3M dan Ormco dan Biom dan Shinye dan terdapat perbedaan besar gaya torque antara kelima braket dengan sudut puntir 30° (kecuali 3M dan Ormco) dan 45°. Kesimpulan, Komposisi logam dan proses pembuatan braket merupakan faktor yang mempengaruhi terjadinya deformasi slot braket dan besar gaya torque. Maj Ked Gi. Juni 2013; 20(1): 35 -44. ABSTRACT: Slot Deformation in Various Stainless Steel Bracket Products due to The Torqueing Force of Beta Titanium Wire. Stainless Steel bracket slot deformation affects force applied to teeth. The research aims to determine slot deformation of five different bracket brands namely, 3M, Biom

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“…Various bracket manufacturing processes such as injection-molding, casting, and milling can affect the accuracy of the prescribed torque values, and this has been reported to be about 5% to 10% (Gioka & Iliades, 2004). Huang et al, 2009, reported that torque angle/torque moment behavior is determined by the characteristics of the archwire. The effect of the bracket system is of minor importance, with the exception of self-ligating brackets with an active clip (eg.…”

Section: Torque Expression and Arch Dimensional Changementioning

confidence: 99%

Self-Ligating Brackets: An Overview

Zreaqat¹,

Hassan²

2011

Principles in Contemporary Orthodontics

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Numeric modeling of torque capabilities of self-ligating and conventional brackets

Cited by 56 publications

References 20 publications

Bidimensional techniques for stronger anterior torque control in extraction cases

Bidimensional techniques for stronger anterior torque control in extraction cases

Deformasi Slot Beberapa Produk Braket Stainless Steel Akibat Gaya Torque Kawat Beta Titanium

Self-Ligating Brackets: An Overview

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