Influence of second-order bracket-archwire misalignments on loads generated during third-order archwire rotation in orthodontic treatment.

The Angle Orthodontist
Dan L RomanykP W Major

Abstract

To investigate the influence of a rotational second-order bracket-archwire misalignment on the loads generated during third-order torque procedures. Specifically, torque in the second- and third-order directions was considered. An orthodontic torque simulator (OTS) was used to simulate the third-order torque between Damon Q brackets and 0.019 × 0.025-inch stainless steel archwires. Second-order misalignments were introduced in 0.5° increments from a neutral position, 0.0°, up to 3.0° of misalignment. A sample size of 30 brackets was used for each misalignment. The archwire was then rotated in the OTS from its neutral position up to 30° in 3° increments and then unloaded in the same increments. At each position, all forces and torques were recorded. Repeated-measures analysis of variance was used to determine if the second-order misalignments significantly affected torque values in the second- and third-order directions. From statistical analysis of the experimental data, it was found that the only statistically significant differences in third-order torque between a misaligned state and the neutral position occurred for 2.5° and 3.0° of misalignment, with mean differences of 2.54 Nmm and 2.33 Nmm, respectively. In addition, in ...Continue Reading

References

May 9, 1998·Seminars in Orthodontics·R P Kusy, J Q Whitley
Jan 1, 2003·Journal of Orofacial Orthopedics = Fortschritte Der Kieferorthopädie : Organ/official Journal Deutsche Gesellschaft Für Kieferorthopädie·Henner GmyrekWinfried Harzer
Jan 5, 2011·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·Thomas W MajorPaul W Major
May 17, 2011·European Journal of Orthodontics·Miyuki HiraiNoriyoshi Shimizu
May 11, 2012·European Journal of Orthodontics·Iosif SifakakisChristoph Bourauel
May 2, 2013·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·Garrett W MelenkaPaul W Major
May 18, 2013·The Angle Orthodontist·Iosif SifakakisChristoph Bourauel

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Citations

Jun 5, 2016·European Journal of Orthodontics·Dan L RomanykPaul W Major
Nov 23, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Bill TranDan L Romanyk

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