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Evaluation of the correlation between dental arch width and dentofacial parameters using cone-beam computed
Ziyang Min1, Jiaojiao Li2, Liangyu Luo1
1State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
Introduction:
The aim of this retrospective study was to evaluate the associations between dental arch width (DW) and dentofacial parameters, age, and sex in adults with individual normal occlusion.
Methods:
A total of 162 adults were included in this study. The DW, alveolar arch width (AW), sum of the mesiodistal diameters of the maxillary incisors (SI), bizygomatic width, bigonial width, and average alveolar arch coordination angle (AACA) were measured using cone-beam computed tomography. Facial vertical morphology was evaluated by SN-MP using cephalometric analysis. Bivariate and multiple regression analyses were performed to assess the associations between DW and age, sex, and dentofacial parameters.
Results:
The correlations between the DW and the above parameters were confirmed through bivariate analyses. Based on the optimal set of variables in the multiple regression analyses, the AW (P < 0.001), AACA (P < 0.1), and SI (P < 0.1) were strongly positively correlated with the DW. From anterior to posterior, the standardized coefficients of AW and AACA exhibited an almost universal increment, whereas those of the SI decreased. Increased AACA led to wider maxillary intercanine, interpremolar, and intermolar widths but narrower mandibular intermolar widths (P < 0.05). Regression models including 2-5 variables explained approximately 50.1%-73.2% of the variation observed in the DW.
Conclusions:
DW can be accurately predicted based on age, sex, and dentofacial parameters. The AW, AACA, and SI were the most important determinants of DW in East Asian populations.
