Clinical Implications of Preformed Archwire Selection on the Treatment of Angle
Class I/II division 1 Malocclusions in Thais
Published: May 1, 2015 | DOI: https://doi.org/10.7860/JCDR/2015/.5890
Kittipong Dacha, Pornrachanee Sawaengkit, Jiraporn Chaiwat, Montip Tiensuwan
1. Graduate Student, Mahidol University Faculty of Dentistry, Bangkok, Thailand.
2. Associate Professor, Department of Orthodontics, Mahidol University Faculty of Dentistry, Bangkok, Thailand.
3. Clinical Professor, Department of Orthodontics, Mahidol University Faculty of Dentistry, Bangkok, Thailand.
4. Associate Professor, Department of Mathematics, Mahidol University Faculty of Sciences, Bangkok, Thailand.
Correspondence
Dr. Pornrachanee Sawaengkit,
Associate Professor, Department of Orthodontics, Mahidol University Faculty of Dentistry,
6 Yothi Street, Bangkok 10400, Thailand.
E-mail: pornrachanee.saw@mahidol.ac.th
Introduction: The dental arch forms were compared of untreated Class I and Class II div 1 malocclusions to those of non-customized preformed archwires manufactured by American Orthodontics, G&H, Highland, Ormco, RMO, and 3MUnitek. Arch forms of post-treatment Class II div 1 malocclusions treated by four 1st premolar extractions are also compared.
Materials and Methods: Four metrics of archform shape and size (canine and 1st molar depth and inter-canine and inter 1st molar width) were measured on dental casts of 40 Class I and 22 Class II div 1 patients. These same metrics were also used to describe preformed archwire forms.
Results: Non-customized preformed wires all showed significantly narrowed mandibular arch forms. This was true for maxillary archwires, with four exceptions. The Highland Natural Arch form, G&H True form I, and RMO natural preformed archwires showed both inter-canine and 1st molar widths statistically the same as mean dental arch widths in both the untreated and post-treatment Class II groups. In Class I patients, these three archwires showed only inter-canine widths equivalent to dental measurements. The Highland Progressive archwire matched only the 1st molar width in the untreated Class II group.
Conclusion: None of these archwires – if used unadjusted, will produce a significant expansive force in either the maxillary or mandibular arch. Three maxillary non-customized preformed archwires showed both inter-canine and 1st molar arch widths statistically the same as Thai Class II div 1 dental arch dimensions. Using them to treat this malocclusion should minimally affect both pre and post-treatment maxillary arch form.
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