University of Khartoum

Prediction of Mesiodistal Size for Unerupted Canines, Premolars and Measurement of Arch Width in a Sample of Yemeni Population

Prediction of Mesiodistal Size for Unerupted Canines, Premolars and Measurement of Arch Width in a Sample of Yemeni Population

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Title: Prediction of Mesiodistal Size for Unerupted Canines, Premolars and Measurement of Arch Width in a Sample of Yemeni Population
Author: Al-Hothri, Mohamed Aidross Mothana
Abstract: Background: During the mixed dentition period, prediction the size of the unerupted canines and premolars form a critical aspect of diagnostic process and early orthodontic treatment. Moyers probability tables and Tanaka & Johnston equations methods are the most applicable one. In orthodontics, the diagnosis and treatment planning require accurate knowledge of tooth dimensions and arch width. Design: Descriptive and cross-sectional study. Objectives: To evaluate the applicability of Moyers probability tables and Tanaka & Johnston equations and develop, if required, a new probability tables and equations for the prediction of the mesiodistal size of unerupted permanent canine and premolars for the Yemeni population. In addition, to establish the inter-canines and inter-molars widths measurement. Methods:A total of 392 sets of dental casts were obtained from 196 males and 196 females. The age range 16-21 years was selected from dental clinics at Universities and government hospitals in Yemeni cities; Hodeida, Sana'a and Aden. The mesiodistal widths of the maxillary and mandibular canines and premolars (C-PM), the mandibular incisors (MPI), and inter-canines and inter-molars width in both genders were manually measured on the dental casts using a digital caliper. The actual values of the mesiodistal widths of (C-PM) were statistically compared with the predicted values of (C-PM) by using Moyers probability tables and Tanaka & Johnston equations of the same quadrant. Results: A strong positive correlation coefficient (0.72) between the mesiodistal width of the mandibular permanent incisors and the actual width of mandibular (C-PM), moderate positive (0.64) between the width of mandibular incisors and the actual width of maxillary (C-PM), a coefficient of determination were recorded (0.51 and 0.41) and the standard error of estimate was (0.78 and 0.85) in mandibular and maxillary arches respectively for combined genders. The Tanaka & Johnston prediction equations overestimated the actual mesiodistal widths of (C-PM) in both archesfor both genders (P<0.001). Moyers probability tables overestimated the actual measurements of (C-PM)(P<0.001)except for the female in maxillary arch at 50% confidence level (P=0.792), and for the males in mandibular arch at 75% confidence level (P=0.487). A new prediction probability tables and equations were proposed for Yemeni population. No statistical difference between the predicted and actual values of (C-PM) was observed. It can be clinically usefulin a Yemeni population for predicting the mesiodistal width of unerupted (C-PM). In the mandible, the inter-canine width was (25.9 ± 2.1) mm, inter-molars was (43.1 ± 2.9) mm, and in the maxilla, the inter-canine width was (33.2 ± 2.6) mm, inter-molars was (49.4 ± 4.0) mm. Conclusion: The results illustrate the limitation of Moyers probability table and Tanaka &Johnston equations for Yemeni population. New probability tables and equations were proposed for predicting the mesiodistal width of unerupted (C-PM) for Yemeni population; it gave better and accurate estimate among Yemeni population.
URI: http://khartoumspace.uofk.edu/123456789/26103


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