Dental arch characteristics among South Indian twins

a morphometric study




Dental arch, Twins, India


Genetic and environmental factors are essential in occlusal variations and malocclusion and have been of considerable interest to orthodontists. Studies on twin pairs are one of the most effective methods for investigating genetically determined occlusal variables. Many studies have focused on distances between first molars or between canines but malocclusions can also occur in other regions of the dental arch. Aim: To evaluate the characteristics of the dental arch between pairs of Monozygotic (MZ) and Dizygotic (DZ) twins from Southern India. Methods: A random sample of 51 twin pairs (12–18years old) participated in this study. The zygosity of twin pairs was recorded by facial appearance. The occlusion of the first permanent molars was recorded according to Angle’s classification. Study models were prepared to assess dental arch characteristics (i.e., arch form, arch perimeter, arch length; intercanine, intermolar width, and teeth size discrepancy). The obtained data was statistically analyzed using SPSS software 19.0. The student’s t-test (two-tailed, independent) and Chi-square test was used to determine the significance of studied parameters. Results: Angle’s Class I molar relation was more commonly observed followed by the Class II molar relationship among twins. The measured dental arch dimensions did not show a statistically significant difference among twin pairs. The ovoid arch form was commonly observed among Monozygotic and Dizygotic Twins. There was a similarity among MZ and DZ twins in the anterior and overall Bolton’s ratio. Conclusion: There were similar occurrences of measured parameters among twins, which showed genetic predominance in the expression of measured dental arch traits.


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Author Biographies

KL Girish Babu , Hassan Institute of Medical Sciences

Department of Dentistry, Hassan Institute of Medical Sciences, Hassan-573201, India.

Geeta Maruti Doddamani, Hospital and Research Centre

Department of Orthodontics and Dento-facial Orthopaedics, Dr Syamala Reddy Dental College, Hospital and Research Centre, Bangalore, India.

Gururaj Hebbar Kavyashree, Hassan Institute of Medical Sciences

Department of Dentistry, Hassan Institute of Medical Sciences, Hassan-573201, India.


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How to Cite

Girish Babu K, Doddamani GM, Kavyashree GH. Dental arch characteristics among South Indian twins: a morphometric study. Braz. J. Oral Sci. [Internet]. 2022 Mar. 9 [cited 2023 Feb. 7];21(00):e225388. Available from:



Original Research