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VOLUME 19 , ISSUE 1 ( January, 2018 ) > List of Articles

ORIGINAL RESEARCH

Study Model-based Evaluation of Built-in Tip, Torque, and In–out Characteristics of a Third-generation Preadjusted Edgewise Appliance

Rishabh Gupta, Gowdara Shivaprakash, Mala R Manohar, Sonali Sonali

Citation Information : Gupta R, Shivaprakash G, R Manohar M, Sonali S. Study Model-based Evaluation of Built-in Tip, Torque, and In–out Characteristics of a Third-generation Preadjusted Edgewise Appliance. J Contemp Dent Pract 2018; 19 (1):20-29.

DOI: 10.5005/jp-journals-10024-2206

License: CC BY-NC 3.0

Published Online: 01-01-2018


Abstract

Aim: The aim of the study was to evaluate the clinical effectiveness of MBT™ preadjusted edgewise appliance (PEA) in terms of achieving the optimal expression of its built-in characteristics of tip, torque, and in–out. Materials and methods: Pretreatment and posttreatment study models of 20 subjects who received full fixed appliance treatment involving four first premolar extractions using the MBT™ appliance were measured for tip, torque, and in–out using the method described by Andrews. Treatment changes were analyzed statistically, and the posttreatment measurements were compared with the MBT™ specifications as well as Andrews’ values for the above-mentioned parameters. Results: Except for the maxillary canines and second premolars, the built-in tip of MBT™ appliance was nearly fully expressed, though there was some lack of correlation with Andrews’ values. Despite the fact that the full amount of torque built into the MBT™ appliance was not expressed, torque measurements for all teeth except the maxillary second premolars and the first molars showed either no statistically significant difference or were significantly higher than Andrews’ values for these teeth. In–out readings were lower than both MBT™ and Andrews’ values, but the relative order of crown prominences was similar. Conclusion and clinical significance: The MBT™ appliance is thus effective in ensuring a successful treatment result, though individual adjustments may be necessary for optimal tooth positioning at the end of the treatment, as with any preadjusted appliance.


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  1. Creekmore TD, Kunik RL. Straight wire: the next generation. Am J Orthod Dentofacial Orthop 1993 Jul;104(1):8-20
  2. Normal faciolingual inclinations of tooth crowns compared with treatment groups of standard and pretorqued brackets. Am J Orthod Dentofacial Orthop 1997 Jul;112(1):50-57
  3. ; Bennett, JC.; Trevisi, HJ. Systemized orthodontic treatment mechanics. St Louis (MO): CV Mosby Co; 2001. pp. 27-54
  4. A scientific assessment of the straight-wire appliance. Am J Orthod 1978 Mar;73(3):290-299
  5. Statistical evaluation of torque angles in reference to straight-wire appliance (SWA) theories. Am J Orthod 1986 Jan;89(1):56-66
  6. Objective assessment of occlusal and coronal characteristics of untreated normals: a measurement study. Am J Orthod Dentofacial Orthop 2004 May;125(5):582-588
  7. The impact of bracket selection and bracket placement on expressed tooth movement and finishing details. In: Nanda R, Kapila S, editors. Current therapy in orthodontics. St. Louis (MO): Mosby; 2010. pp. 68-77
  8. Straight wire: the concept and appliance. San Diego (CA): K-W Publications; 1989. pp. 13-33
  9. Finishing and detailing with a preadjusted appliance system. J Clin Orthod 1991 Apr;25(4): 251-264
  10. Controlled space closure with a preadjusted appliance system. J Clin Orthod 1990 Apr;24(4):251-260
  11. Treatment mechanics for the straight-wire appliance. In: Graber LW, Swain BF, editors. Orthodontics, current principles and techniques. St Louis (MO): CV Mosby; 1985. pp. 665-716
  12. Straight-wire design strategies: five year evaluation of the Roth modification of the Andrews straight-wire appliance. In: Graber LW, editor. Orthodontics; state of the art, essence of the science. St Louis (MO): CV Mosby; 1986. pp. 279-298
  13. Edgewise orthodontics. 4th ed. St Louis (MO): CV Mosby Co; 1982. pp. 196-218
  14. Preadjusted edgewise appliances: theory and practice. Am J Orthod 1978 May;73(5):485-498
  15. Three biologic variables modifying faciolingual tooth angulation by straightwire appliances. Am J Orthod Dentofacial Orthop 1989 Oct; 96(4):312-319
  16. Effect of variation in tooth morphology and bracket position on first and third order correction with preadjusted appliances. Am J Orthod Dentofacial Orthop 1999 Sep;116(3):329-335
  17. Materials-induced variation in the torque expression of preadjusted appliances. Am J Orthod Dentofacial Orthop 2004 Mar;125(3):323-328
  18. Choosing a pre-adjusted orthodontic appliance prescription for anterior teeth. J Orthod 2007 Jun;34(2):95-100
  19. Influence of vertical growth pattern on faciolingual inclinations and treatment mechanics. Am J Orthod Dentofacial Orthop 1990 Nov;98(5):422-429
  20. Bracket placement with the preadjusted appliance. J Clin Orthod 1995 May;29(5):302-311.
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