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Published: 2026-05-04
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DOI: https://doi.org/10.52163/yhc.v67iCD5.5015
Issue
Tập 67 Số CĐ5-NCKH
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Articles
How to Cite
Thủy, T. H. L., Vương, V. Q., Minh, N. Q., Anh, N. V., & Ngọc, V. T. N. (2026). ASSESSMENT OF ARCH SIZE CHANGES USING SOFTWARE ON ORAL SCAN MODELS IN ORTHODONTIC PATIENTS UNDERGOING MINIMAL MOLAR TOOTH EXTRACTION. Vietnam Journal of Community Medicine, 67(CD5). https://doi.org/10.52163/yhc.v67iCD5.5015

ASSESSMENT OF ARCH SIZE CHANGES USING SOFTWARE ON ORAL SCAN MODELS IN ORTHODONTIC PATIENTS UNDERGOING MINIMAL MOLAR TOOTH EXTRACTION

Truong Hoang Le Thuy1, Vu Quoc Vuong2, Nguyen Quang Minh3, Nguyen Vu Anh3, Vo Truong Nhu Ngoc2
1 Faculty of Dentistry, Hong Bang International University
2 Nhu Ngoc Dental Clinic
3 Faculty of Dentistry, Vietnam National University of Medicine and Pharmacy, Hanoi

Main Article Content

Abstract

Objective: To quantitatively assess the changes in dental arch dimensions in orthodontic patients who underwent extraction of premolar teeth, using analysis software on digital dental models generated by an intraoral 3D scanner system.


Methods: A retrospective study was conducted on 27 patients who completed orthodontic treatment at Nhu Ngoc Dental Clinic. The 3D scan data of both upper and lower arches (.STL files) before treatment (T0) and after treatment (T1) were measured using digital software to compare the following dimensions: canine interproximal width, molar interproximal width, arch length, and arch perimeter.


Results: The study observed a significant reduction in arch length and perimeter after orthodontic treatment (p < 0.05). However, the inter-canine width tended to remain stable, indicating that the dental arch was not narrowed in the anterior region. In contrast, the inter-molar width significantly decreased due to the loss of physiological anchorage.


Conclusion: Premolar extraction in orthodontic treatment primarily affects the anterior-posterior arch dimensions and the posterior region's width. However, the canine interproximal width is preserved, contributing to maintaining the aesthetic of the smile.

Article Details

Keywords

Orthodontics, premolar extraction, 3D scanner, dental arch dimensions, canine interproximal width, molar interproximal width.

References

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