Mixed dentition analysis - Applicability of two non-radiographic methods for Chennai school children

Mixed Dentition Analysis in and around Kanpur City: An Existential and Illustrative Study

Context

Mixed dentition space analysis helps in determining the discrepancy between the available and required space in each dental arch during the mixed dentition period; further, it helps to diagnose and plan the treatment of developing malocclusion.

Aim

The aim of this study is to evaluate the applicability of Tanaka and Johnston's and Moyer's methods of predicting the size of permanent canines and premolars and compare the tooth size between the right and left sides between males and females, and also to compare the predicted values of mesiodistal widths of permanent canines and premolars from Tanaka and Johnston and Moyer's method with the measured values.

Materials and methods

The sample consisted of 58 sets of study models, of which 20 were girls and 38 were boys, that were collected from the children of the 12-15 year age-group. A digital vernier gauge, whose beaks were sharpened, was used to measure the mesiodistal widths of the individual teeth in order to increase accuracy.

Statistical analysis

The two-tailed paired t-tests were used to assess the bilateral symmetry of the mesiodistal diameter of all measured individual teeth.

Results and conclusion

It was concluded that Tanaka and Johnston's method could not accurately predict the mesiodistal widths of unerupted canines and premolars of children of Kanpur city due to the high variability in estimation, whereas the least statistically significant difference was obtained only at 65% level of Moyer's probability chart for male, female, and combined sample.

How to cite this article

Gaur S, Singh N, Singh R, et al. Mixed Dentition Analysis in and around Kanpur City: An Existential and Illustrative Study. Int J Clin Pediatr Dent 2022;15(5):603-609.

Accuracy and evaluation of a new regression equation in predicting the width of unerupted permanent canines and premolar teeth

AIM

To assess the applicability of two regression equations based on mixed dentition analysis and to propose and evaluate a new regression equation using the mandibular incisors and first permanent molars as predictors in calculating the size of unerupted permanent canines and premolar teeth in school children.

METHODS

Dental study casts of 100 children (50 males and 50 females) aged 11-14 years from schools situated in Moradabad, Uttar Pradesh, India were used. The analysis of Tanaka Johnston, Bernabe Flores-Mir and the proposed equation were tested on the casts.

RESULTS

The analysis of Tanaka Johnston and Bernabe Flores-Mir tended to overestimate the mesio-distal width of the canines and premolars. The proposed equation also overestimated but the mean difference showed a closer approximation with the actual measured values compared to the other two equations.

CONCLUSION

Validating studies with a similar population must be conducted to confirm the applicability and precision of the proposed equation.