In vitro torque-deformation characteristics of orthodontic polycarbonate brackets

Feldner, Josef C.; Sarkar, N. K.; Sheridan, J.; Lancaster, Diana M.

doi:10.1016/s0889-5406(94)70046-x

Cited by 65 publications

(67 citation statements)

References 16 publications

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“…They tend to stain under the infl uence of food and drinks, thereby compromising aesthetics ( Aird and Durning, 1987 ). Moreover, all polycarbonate brackets demonstrate low resistance to torque forces and high deformation values ( Feldner et al , 1994 ). In terms of bond strength, adequate adhesion is diffi cult to achieve with such brackets due to their inert matrix ( Özcan et al , 2004 ).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of failure characteristics and bond strength after ceramic and polycarbonate bracket debonding: effect of bracket base silanization

Özcan¹,

Finnema²,

Ybema³

2008

The European Journal of Orthodontics

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Section: Introductionmentioning

confidence: 99%

Evaluation of failure characteristics and bond strength after ceramic and polycarbonate bracket debonding: effect of bracket base silanization

Özcan¹,

Finnema²,

Ybema³

2008

The European Journal of Orthodontics

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“…Others speak of an initial torque of 1.0-2.0 Ncm being needed to maintain an adequately broad torque range [2,4,9,21]. In addition to these specified reference values, it should be borne in mind that higher forces can be applied in children and adolescents than in adults.…”

Section: Introductionmentioning

confidence: 99%

“…Only a small number of studies have dealt to date with the extent of torque-induced deformation of plastic brackets and with their torque capacity [1,7,9,14]. Feldner et al [9] and Alkire et al [1] each investigated the torque capacity of five different polycarbonate brackets.…”

Section: Introductionmentioning

confidence: 99%

Torque Capacity of Metal and Plastic Brackets with Reference to Materials, Application, Technology and Biomechanics

Gmyrek

Bourauel

Richter

et al. 2002

Journal of Orofacial Orthopedics / Fortschritte der Kieferortho

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On the basis of the present results, the Brillant and Aesthetik-Line plastic brackets and the MINI-MONO metal bracket can be recommended for torquing. In view of the high torque losses, however, the torques programmed in the straight wire technique must be seen as questionable. It would be helpful to the practitioner if data were provided by the manufacturer on the flexing to be expected in plastic brackets, which has to be offset by additional torque or the possible renunciation of bracket torque.

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“…Nikolai 44 recommended a value of 1020 g 3 mm and 3000 to 3500 g 3 mm torque, respectively, on a maxillary canine and four maxillary incisors. Feldner et al 45 identified a lower value of 1000 to 2000 g 3 mm for the upper incisor segment. According to Burstone,46 a force of 1000 g 3 mm was necessary to torque one upper central incisor, whereas a force of 1500 g 3 mm was optimal to torque two upper incisors per side.…”

Section: Methodsmentioning

confidence: 95%

Torsional superelasticity of NiTi archwires

Bolender

Vernière

Rapin

et al. 2010

The Angle Orthodontist

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Objective: To reproduce and compare the intraoral torsional behavior of 10 commonly used preformed upper NiTi 0.017 3 0.025 archwires in 0.018-slot brackets at 20uC, 35uC, and 55uC. Materials and Methods: Ten upper preformed NiTi archwires were compared to a multibraided stainless steel wire. An original testing bench was used to reproduce palatal root torque applied onto an upper central incisor with a maximum value of 1540 g 3 mm. Ten samples of each wire type were tested at 20uC, 35uC, and 55uC each. Results: Loading and unloading at 20uC revealed three categories of wires: a group of four NiTi wires of relative stiffness bereft of any superelasticity, a group of six NiTi wires displaying some horizontal plateau, and finally the stainless steel wire of lesser stiffness. Testing at the average oral temperature of 35uC produced the same three categories of wires, with only 2 of 10 NiTi wires displaying a superelastic effect (Copper NiTi 35uC and 40uC). None of the NiTi wires was superelastic at 55uC. Moments increased with temperature as the martensite was replaced by the more rigid austenite. Conclusion: This study showed that most NiTi wires did not exhibit in torsion the superelastic effect traditionally described in bending. The combination of straight-wire prescriptions and rectangular superelastic NiTi archwires did not provide optimal constant moments necessary to gain third-order control of tooth movement early in treatment. A braided stainless steel rectangular archwire displayed better torsional behavior at 35uC than most NiTi archwires of the same dimensions.

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In vitro torque-deformation characteristics of orthodontic polycarbonate brackets

Cited by 65 publications

References 16 publications

Evaluation of failure characteristics and bond strength after ceramic and polycarbonate bracket debonding: effect of bracket base silanization

Evaluation of failure characteristics and bond strength after ceramic and polycarbonate bracket debonding: effect of bracket base silanization

Torque Capacity of Metal and Plastic Brackets with Reference to Materials, Application, Technology and Biomechanics

Torsional superelasticity of NiTi archwires

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