Nasrullah Mengal, Ambreen Afzal.
Mixed dentition analysis for Pakistani population.
J Surg Pak Jan ;9(1):10-4.

Objectives: To examine the applicability of the Tanaka & Johnston method of prediction and to find the significant difference in Pakistani population. Design: Comparative cross sectional study. Place & Duration: The study was conducted at Karachi Medical & Dental College, Karachi, from September 2001 to September 2003. Patients And Methods: The 300 study dental plaster casts of Pakistani subjects under the age of 21 years, who presented with complete eruption of permanent mandibular incisors, canines and premolars, as well as maxillary canines and premolars were measured. The measuring device was a modified Boley`s gauge. The sampling technique was non-probability with a comparative. study design. Statistical analysis was made by using SPSS version-10. Descriptive statistics was used for data presentation. Students t- test and test of linear correlation was used for testing the null hypothesis. Level significance was taken at p<0.000. Results: The difference between the predicted widths of the canine and premolars with the Tanaka and Johnston equations and the actual widths were highly significant in the statistical sense, indicated by t test. The actual widths of the maxillary and mandibular canine and premolars showed a significant difference in size (p < 0.000) from the widths predicted by the Tanaka and Johnston method. The data illustrates the limitation of Tanaka and Johnston method when applied to our population. Conclusion: The Tanaka and Johnston prediction method does not accurately predict the mesiodistal diameters of unerupted canines and premolars in Pakistani population.

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