En masse retraction versus two-step retraction of anterior teeth in extraction treatment of bimaxillary protrusion

Felemban, Nayef H.; Alsulaimani, Fahad F.; Murshid, Zuhair; Hassan, Ali

doi:10.4103/2278-0203.110330

Cited by 25 publications

(29 citation statements)

References 15 publications

(19 reference statements)

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“…This study, however, aimed to evaluate springs for en masse retraction, where a force twice as large is generally suggested. 13,14,19 Thus, the 0.016" 3 0.022" T-loop produced forces below what is supposedly deemed necessary for en masse retraction (Table 7) but still considered greater than the force deemed necessary for canine retraction. 9 Another T-loop made with the same brand of NiTi we used (Sentalloy, Dentsply GAC International Inc) out of 0.016" 3 0.025" wire 9 showed an even smaller force than we did, probably due to its larger height (10 mm) than ours (6 mm) and because of more extensive heat treatment, which decreases the pseudoelastic plateau of NiTi materials.…”

Section: Discussionmentioning

confidence: 99%

“…Because recent studies have shown that there is no difference in the rates of anterior retraction and loss of anchorage between that and en masse retraction, [13][14][15] it makes sense that the latter method would be clinically more practical and save chair time. The issue is that previously described available NiTi T-loop9 designs produce low forces for that purpose (below 250 gf at the beginning of deactivation), either because they were made from a small dimension wire, such as 0.016" 3 0.022", 9 or because they were possibly not activated enough.…”

Section: Introductionmentioning

confidence: 99%

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Nickel titanium T-loop wire dimensions for en masse retraction

Almeida

Ribeiro²,

Martins

et al. 2016

The Angle Orthodontist

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Objective: To compare the force system produced by nickel-titanium T-loop springs made with wires of different dimensions. Material and Methods: Thirty compound T-loop springs were divided into three groups according to the dimensions of the nickel-titanium wire used for its design: 0.016" 3 0.022", 0.017" 3 0.025", and 0.018" 3 0.025". The loops were tested on the Orthodontic Force Tester machine at an interbracket distance of 23 mm and activated 9 mm. The force in the y-axis and the moment in the x-axis were registered while the calculated moment to force ratio was recorded at each .5 mm of deactivation. The data were analyzed by three analyses of variance of repeated measures to detect differences and interactions between deactivation and wire size on force, moment, and moment-force ratios (M/F). Results: All groups had significantly different forces (P , .001). The 0.016" 3 0.022" wire produced 1.78N of force while the 0.017" 3 0.025" and the 0.018" 3 0.025" produced 2.81 N and 3.25 N, respectively. The 0.016" 3 0.022" wire produced lower moments (11.6 Nmm) than the 0.017" 3 0.025" and 0.018" 3 0.025" wires, which produced similar moments (13.9 Nmm and 14.4Nmm, respectively). The M/F produced was different for all groups; 0.016" 3 0.022" T-loops produced 6.7 mm while the 0.017" 3 0.025" and 0.018" 3 0.025" T-loops produced 5.0 mm and 4.5 mm, respectively. An interaction was detected for all variables between deactivation and groups.Conclusion: The larger wires tested produced higher forces with slight increase on the moments, but the M/F produced by the 0.016" 3 0.022" wire was the highest found. (Angle Orthod. 2016;86:810-817.)

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nickel titanium T-loop wire dimensions for en masse retraction

Almeida

Ribeiro²,

Martins

et al. 2016

The Angle Orthodontist

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“…A controlled inclination movement -instead of translation (Burstone) is applied from initial stages of space closure in such cases (Martins et al, 2009). β-Ti T-type loops produce controlled orthodontic tooth movements in a time-efficient way (Gurgel et al, 2001), through the delivery of determined force systems that facilitate individualized or en-masse retraction (Insabralde et al;Felemban et al, 2013). However, a significant decrease of force after 3 mm of deactivation is regularly found in clinical settings (Menghi et al, 1999;Viecilli, 2006;Almeida et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

M/F Changes after T-loop Upper Horizontal Bending in Segmented Arch Mechanics

Muñoz-Rendón

Montoya-Góez

Gómez-Gil

2016

Int. J. Odontostomat.

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βTi T-type loops are a frictionless, efficient alternative for extraction space closure. Changes in the upper horizontal portion of T-type loops to improve their mechanical behavior have been proposed, but differences in their biomechanical characteristics have not been well described. This stu dy analyzed the biomechanical differences among three T-type loops with differential bends in their upper horizontal portion. Ninety loops (0.017"x0.025" βTi) were bent and randomly divided in 3 groups according to the form of their upper horizontal portion (T [straight], M [convex], and C-loops [concave]), to evaluate force characteristics up to 6 mm of activation. Stiffness, maximum horizontal loads, total loop moments, and moment-to-force ratios were obtained. Nonparametric statistical analyses were used to test differences among groups. M-loops demonstrated lower force than T-and C-loops, and higher total loop moment than T-loops. A significant increase in M-loop moment-to-force ratio compared with T-or C-loops was obtained. C-and T-loops did not demonstrate significant differences in moment-to-force ratio between them. The convex upper bend in M-loops produced an increased total loop moment compared with T-loops. M-loops demonstrated moment-to-force values slightly higher than translation values, while the other loops reported only controlled inclination values at 6 mm of activation. M-loops are ideal when a higher control of root movement is indicated since the beginning of dental retraction in segmented arch mechanics.

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“…1,4 Salah satu teknik penutupan ruang pada perawatan ortodonti dengan pencabutan adalah memakai T-loop segmental. [7][8][9] Teknik ini menjadi pilihan ketika operator tidak menghendaki friksi dan menginginkan kontrol gerakan tipping serta rotasi melalui pengaturan momen (Gambar 1). 7,10 Penelitian ini bertujuan mengetahui pengaruh heat treatment pada suhu 450°C selama 15 menit terhadap pegas segmental T-loop stainless steel, dengan berbagai variasi sudut gable dan jarak tarik terhadap besar gaya yang dihasilkan.…”

Section: Pendahuluanunclassified

Pengaruh Heat Treatment untuk Mengembalikan Sifat Mekanik Kawat T-loop Segmental Stainless Steel terhadap Besaran Gaya yang Dihasilkan

Lavina¹,

Hambali²,

Thahar³

et al. 2015

mkb

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AbstrakProsedur heat treatment dengan suhu dan teknik yang tepat pada pegas T-loop segmental stainless steel dapat mengembalikan sifak-sifat mekanik kawat yang menurun akibat prosedur pembengkokan kawat. Penelitian ini bertujuan membandingkan gaya yang dihasilkan oleh pegas T-loop segmental stainless steel tanpa dan dengan heat treatment pada suhu 450 0 C selama 15 menit, dengan berbagai jarak aktivasi dan gable. Desain penelitian adalah eksperimental laboratoris murni secara in vitro. Penelitian dilaksanakan di Laboratorium Kimia Murni FMIPA ITB pada tahun 2006. Sampel adalah 50 buah pegas T-loop segmental dengan gable: 0°-0°, 7,5°-7,5°; 15°-15°; 22,5°-22,5°; 30-30°, terdiri atas 25 pegas tanpa heat treated dan 25 pegas dengan heat treated. Gaya diukur menggunakan autograph pada jarak tarik 1, 2, dan 3 mm, serta hasilnya dilakukan analisis statistik ANOVA dengan desain faktorial 2 x 3 x 5 dan 5 replikasi tiap sel serta uji posthoc Student Newman Keuls dan Tukey. Hasil uji statistik menunjukkan bahwa perlakuan heat treated dibanding dengan tanpa heat treated serta interaksi antara perlakuan heat treatment dan gable memberikan efek yang signifikan terhadap gaya yang dihasilkan The Effect of Heat Treatment on Mechanical Properties in Restoring Stainless Steel Segmental T-Loop towards the Force Created AbstractHeat-treatment procedure with precise temperature and technique on the stainless-steel segmental T-loop retraction spring can restore the mechanical properties that decreases after a wire-bending process. The goal of this study was to compare the force produced by a stainless-steel segmental T-loop spring without and with heat-treatment on 450 0 C for 15 minutes, with various activation distance and gable. The design of the study was in-vitro laboratory experimental design. This study was performed at the Chemistry Laboratory of the Faculty of Science, ITB in 2006. Sample included 50 segmental T-loop springs with α and β angle of 0°-0°, 7.5°-7.5°, 15°-15°, and 22.5°-22.5°, and 30°-30° which consisted of 25 springs without heat-treatment and 25 springs with heat-treatment. Force was measured using autograph with a retraction distance of 1, 2, and 3 mm and the results were gained from ANOVA statistics analysis with a factorial design of 2x3x5 and 5 replications for each cell and posthoc Student Newman Keuls and Tukey test. The result of the statistic test showed that heat-treatment compared to no heat-treatment and interaction between heat-treatment and gable gives significant effect to the force created (p-value <0.05). In conclusion, the heat-treatment on the stainless steel T-loop produces an effect to decrease the created force. [MKB. 2015;47(3):167-73]

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En masse retraction versus two-step retraction of anterior teeth in extraction treatment of bimaxillary protrusion

Cited by 25 publications

References 15 publications

Nickel titanium T-loop wire dimensions for en masse retraction

Nickel titanium T-loop wire dimensions for en masse retraction

M/F Changes after T-loop Upper Horizontal Bending in Segmented Arch Mechanics

Pengaruh Heat Treatment untuk Mengembalikan Sifat Mekanik Kawat T-loop Segmental Stainless Steel terhadap Besaran Gaya yang Dihasilkan

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