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Year : 2021  |  Volume : 13  |  Issue : 1  |  Page : 29-37

Evaluation of dental arch forms of Indo-Aryan and Mongoloid ethnicity using 3D models and its correlation with preformed archwires: A cross-sectional study

Department of Orthodontics, SGT University, Gurugram, Haryana, India

Correspondence Address:
Dr. Seema Grover
Department of Orthodontics, SGT University, Gurgaon-Badli Road Chandu, Budhera, Gurugram 122505, Haryana.
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jioh.jioh_203_20

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Aim: The aim of this study was to compare two ethnic groups in India: Indo-Aryan and Mongoloid for variation in arch dimensions, and to determine best-fitting preformed archwire for each group using three-dimensional (3D) models. Materials and Methods: An observational cross-sectional study was conducted on 40 subjects from two ethnic groups. Sample subjects were divided into Group I (n = 20) Indo-Aryan and Group II (n = 20) Mongoloid population. Their maxillary and mandibular plaster models were aligned and laser scanned to obtain 3D virtual models. Linear measurements included intercanine width, intermolar width, canine depth, and molar depth, whereas proportional measurements included canine width/depth ratio, and molar width/depth ratio. Statistical analysis was performed using SPSS statistical software (version 22; IBM, Armonk, New York). Shapiro–Wilk test was done to find if data for both groups were normally distributed (P < 0.05) and Mann–Whitney test for nonnormal distribution groups. Statistical significance was determined at the P < 0.05 level. Results: Intercanine width was similar in both groups, whereas Group II (Mongoloid) showed highly statistically significant increased IMW and IMW/D ratio (P ≤ 0.001) as compared to Group I (Indo-Aryan). Conclusion: Mongoloid arches were broader than that of Indo-Aryan group. For Indo-Aryan group, ovoid and tapered preformed archwire could be used in maxillary arch, whereas only tapered archwire was appropriate in mandibular arch. For Mongoloid group, both ovoid and tapered preformed archwire could be used in both maxillary and mandibular arch.

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