Commercially available archwire forms compared with normal dental arch forms in a Japanese population

Area of Science:

• Orthodontics
• Dental Archform Analysis
• Biomaterials Science

Background:

• Evaluating the conformity of preformed orthodontic archwires to natural dental arch forms is crucial for effective treatment.
• Existing preformed archwires may not adequately represent the diversity of ideal occlusions in contemporary populations.

Purpose of the Study:

• To compare the dimensions of commercially available preformed mandibular archwires with the natural arch forms of orthodontically untreated individuals with ideal occlusions.
• To determine if current preformed archwires accurately replicate ideal dental arch dimensions.

Main Methods:

• Thirty ideal mandibular dental casts were analyzed using 3D laser scanning to measure natural arch widths.
• Twenty preformed mandibular archwires were scanned, and their widths were measured and compared to dental cast measurements.
• Statistical analysis using the Mann-Whitney test was performed to compare archwire and natural arch dimensions.

Main Results:

• The Orthos and Vari-Simplex large preformed archwires most closely approximated ideal arch forms.
• Preformed archwires were found to be significantly narrower than natural ideal dental arches at both canine and first-molar levels (P <0.05 and P <0.01, respectively).

Conclusions:

• Current preformed archwire variations do not fully align with ideal dental arch forms.
• Many commonly used archwires mimic the Roth arch form, originally designed for extraction cases, which may not suit current orthodontic needs.
• Archwires approximately 1-3 mm wider at the canine and 2-5 mm wider at the first-molar level may be necessary for contemporary orthodontic applications.