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Updated: Oct 11, 2025
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Relationship between dental and basal arch forms in mandibular anterior crowding
1Department of Orthodontics, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan.
Summary
In patients with mandibular anterior crowding (MnAC), dental and basal arch widths show positive correlations, particularly at posterior teeth. This suggests basal arch measurements can guide individualized orthodontic treatment for MnAC.
Area of Science:
- Orthodontics
- Dental Arch Analysis
- Craniofacial Morphology
Background:
- Previous studies noted correlations between mandibular dental and basal arch forms in mild crowding.
- The relationship in patients with significant mandibular anterior crowding (MnAC) requiring premolar extraction was previously unclear.
Purpose of the Study:
- To investigate the relationship between mandibular dental and basal arch forms in patients with MnAC.
- To determine if basal arch dimensions can serve as a reference for postorthodontic dental arch form in MnAC patients.
Main Methods:
- Compared mandibular dental and basal arch widths and depths at specific points (FA, WALA) in 30 women with normal occlusion and 30 with Class I MnAC.
- Utilized Pearson correlation coefficient to analyze relationships between arch widths.
Main Results:
- The MnAC group exhibited greater variance in dental arch widths (canine, premolars) and depth (canine).
- Positive correlations between dental and basal arch widths were found in both groups, with an exception at the canine in the MnAC group.
- Higher correlations were observed between dental arch widths and basal arch widths for posterior adjacent teeth.
Conclusions:
- Positive correlations between dental and basal arch widths indicate that basal arch dimensions, especially at posterior teeth, can be a valuable reference.
- This finding supports the creation of individualized postorthodontic dental arch forms for MnAC patients.
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