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##thodontics And Dentofacial Orthopaedics

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The present (in vivo) study was carried out in the Department of Orthodontics and Dentofacial Orthopaedics, Faculty of Dental Sciences, King George’s Medical University, Lucknow (U.P.), India; in association with C.I.P.E.T (Central Institute of Plastics and Engineering Technology), Lucknow (U.P.), India to evaluate and compare the effect of intraoral environment on the properties of different alignment wires retrieved from the patients mouth(72 arches) after initial alignment (4 months) . Selection criteria of subjects were as follows: Inclusion criteria: 1. Upper and lower fixed orthodontic treatment required. 2. Had not undergone orthodontic fixed appliance therapy before. 3. The patient between 12 – …show more content…

The constant stress allows the design of orthodontic archwires that generate the continuous and biomechanical forces that are communicated through the brackets for the leveling and alignment stages of tooth movement. Cu-NiTi or Thermoelastic NiTi (Group III)– thermally activated nickel– titanium has transition temperature close to the level of body temperature(Rohit Sachdeva, 19944). An 0.014 inch(Type III, 35⁰ Cu-NiTi) round wire is used for this study(Fig.3).The martensitic active alloy employs the thermoelastic effect to achieve shape-memory. Copper NiTi generates a more constant force over a long activation span, is more resistant to permanent deformation and exhibit excellent springback characteristics. Graded thermodynamic NiTi(Group IV)- 0.016 x 0.022 inch rectangular arch wire is chosen for the study (Fig.4).A graded thermodynamic wire is a superelastic shape memory nickel titanium wire that provides gradually increasing forces from anterior to posterior segment, all within one arch wire. Therefore, graded thermodynamic wire can be deflected or activated in such a way that it will produce significantly lower forces when deflecting it in the area that engages relatively small anterior teeth, while it will gradually increase the force moving from the anterior to the posterior segment of the wire(Kuftinec and StomD,20085). Hence, Group

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