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Published: 2026-08-25
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DOI: https://doi.org/10.52852/tcncyh.v205i8.5668
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Vol. 205 No. 8 (2026)
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Huyền, N. T., Ly, N. H., Dung, Đào T., & Trang, V. T. T. (2026). Maxillary and mandibular transverse dental arch widths based on the Yonsei index on CBCT in patients with skeletal class III malocclusion. Journal of Medical Research, 205(8), 86-92. https://doi.org/10.52852/tcncyh.v205i8.5668

Maxillary and mandibular transverse dental arch widths based on the Yonsei index on CBCT in patients with skeletal class III malocclusion

Nguyen Thanh Huyen, Nguyen Huong Ly, Dao Thi Dung, Vu Thi Thu Trang

Main Article Content

Abstract

This retrospective cross-sectional descriptive study aimed to evaluate the transverse relationship between the maxillary and mandibular dental arches in orthodontically untreated patients with skeletal Class III malocclusion using cone-beam computed tomography (CBCT). Maxillary arch width at the first molar region (AWU6), mandibular arch width at the first molar region (AWL6), and the AWU6–AWL6 discrepancy were measured according to the Yonsei index. These parameters were analyzed by gender and age group. The mean AWU6 was 47.09 ± 2.36 mm, the mean AWL6 was 50.15 ± 1.99 mm, and the mean AWU6–AWL6 discrepancy was −3.05 ± 2.07 mm. A negative AWU6–AWL6 discrepancy was observed in 79 patients (97.5%). The under-15 year old age group showed the greatest negative discrepancy (−4.00 ± 2.13 mm), while the discrepancy was less negative in the 15–18-year old and over-18-year old age groups. Orthodontically untreated patients with skeletal Class III malocclusion tended to show a transverse maxillomandibular discrepancy at the first molar region.

Article Details

Keywords

Skeletal Class III malocclusion, Yonsei index, transverse discrepancy, posterior crossbite

References

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