The optimal selection of orthodontic archwires allows the professional to make the treatment in an efficient way; therefore, the knowledge of basic mechanical properties is required, which are not revealed by their manufacturers. The purpose of this study was to compare the mechanical properties (constant tension in the activation area, constant elongation in the activation area, maximum resistance and break point) of three thermo-activated titanium-nickel orthodontic archwires. 10 0.4 mm-diameter thermo-activated titaniumnickel orthodontic archwires from the following brands were used: NiTi GACR (Control Group), Nitinol Termoactivado 3M UnitekR, Sentalloy GACR, Nitinol Termoactivado TECNIDENTR. 80 mm test bodies were prepared and tested for traction using a Zwick / Roell machine model Z050 8402 with a 50 kN capacity, at a speed of 1 mm/min and at 37 °C. The results show that the higher...

The optimal selection of orthodontic archwires allows the professional to make the treatment in an efficient way; therefore, the knowledge of basic mechanical properties is required, which are not revealed by their manufacturers. The purpose of this study was to compare the mechanical properties (constant tension in the activation area, constant elongation in the activation area, maximum resistance and break point) of three thermo-activated titanium-nickel orthodontic archwires. 10 0.4 mm-diameter thermo-activated titaniumnickel orthodontic archwires from the following brands were used: NiTi GACR (Control Group), Nitinol Termoactivado 3M UnitekR, Sentalloy GACR, Nitinol Termoactivado TECNIDENTR. 80 mm test bodies were prepared and tested for traction using a Zwick / Roell machine model Z050 8402 with a 50 kN capacity, at a speed of 1 mm/min and at 37 °C. The results show that the higher...

We reported a clinical case of crossed vestibular posterior bilateral bite identified as the Brodie bite that compromises the use of a bonded removable appliance with reverse screw action in the upper maxillary and the use of lower Bihelix. The purpose of modifications of the design permits the expansion appliance to be used in reverse mode mainly in the correction of the Brodie bite in the early mixed dentition. The goals of the treatment were to achieve the correct interception between the teeth of the upper and lower jawbone, to eliminate the mandibular entrapment and the correction of the crossed vestibular posterior bilateral bite.

We reported a clinical case of crossed vestibular posterior bilateral bite identified as the Brodie bite that compromises the use of a bonded removable appliance with reverse screw action in the upper maxillary and the use of lower Bihelix. The purpose of modifications of the design permits the expansion appliance to be used in reverse mode mainly in the correction of the Brodie bite in the early mixed dentition. The goals of the treatment were to achieve the correct interception between the teeth of the upper and lower jawbone, to eliminate the mandibular entrapment and the correction of the crossed vestibular posterior bilateral bite.