Applicability of the Moyers mixed dentition probability tables and new prediction aids for a contemporary population in India (original) (raw)
Related papers
IOSR Journal of Dental and Medical Sciences, 2017
Introduction: Predicting the size of unerupted teeth during the mixed dentition period is a critical factor in managing the developing occlusion. The Nance radiographic method, Moyers mixed dentition space analysis and Johnston Tanaka method are among the most commonly used in clinical practice for detecting tooth sizearch length discrepancies. In view of reported secular trends, racial, and sex differences in tooth sizes, the purposes of this study were to compare and correlate the radiographic and non radiographic mixed dentition space analysis in children of Mandi district, Himachal Pradesh and to formulate a regression equation using the best variable predictors. Method: Odontometric data were collected from 52 male and 48 female subjects of Himachal descent, aging from 8-11 years who had fully erupted mandibular permanent incisors and first molar and unerupted permanent canines and premolars. The measurements of mesiodistal crown widths were made with Vernier scale digital calipers. The odontometric values obtained were then subjected to statistical and linear regression analysis. Results: All tooth groups showed no significant differences (P>0.001) between mesiodistal widths of male and female subjects. Very high correlation was found between the two non radiographic methods i.e. Moyer's and Johnston-Tanaka method with their r values of 0.990. Correlation of Nance radiographic method with Moyer's and Johnston Tanaka method was fair showing r values of 0.661 and 0.673 respectively. Conclusion: Estimation of tooth width in early mixed dentition is best made by means of radiographs of the yet unerupted teeth. The non radiographic methods as given by Moyers and Johnston Tanaka give reasonable approximation for prediction width of crown width when it is impossible to obtain satisfactory image.
World Journal of Dentistry, 2021
Background: Mixed dentition arch analysis is an important criterion in determining an orthodontic treatment plan. The development of the Tanaka-Johnston (1974) and Moyers' prediction (1973, 1998) was established on the Northern European population. However, the corroboration of ethnic tooth size variability suggests that prediction approaches based on a single ethnic sample may not be regarded as universal. Very few studies have been done for the Indian population. Aim and objective: The purpose of the study was done to evaluate the applicability of Tanaka-Johnston and Moyers' mixed dentition analysis in the prediction of mesiodistal width of unerupted canines and premolars for North Indian children. Settings and design: This cross-sectional study was done on 200 participants (100 males and 100 females) in the Department of Pediatric Dentistry and Orthodontics in the North Indian population. Materials and methods: A sample of 200 North Indian population within the age group 12-15 years was randomly drawn. Mesiodistal widths of mandibular incisors and canine and premolars in both the arches were measured from the dental casts of the study participants. The sum of the actual mesiodistal widths of maxillary and mandibular canine-premolars segments was compared to those obtained from Tanaka-Johnston equations and Moyers' prediction tables (35th to 85th percentile). Statistical analysis used: Inferential statistics were performed using unpaired and paired t-tests at a significance level of p < 0.05. Results: Moyers' tables overestimated the widths in maxilla and mandible of males and females at all probability levels (p < 0.001) except underestimation in females mandibular arch only at 35% probability (p = 0.056) and at 35% and 50% probability in maxillary arch (p < 0.001 and p = 0.036, respectively). Tanaka and Johnston equations overestimated the values in both the jaws of both the genders (p < 0.001). Conclusion: Tanaka-Johnston equations overestimated the values therefore less appropriate to be used in this population; however, Moyers' prediction tables can be used but at different probability levels for both genders.
Applicability of Moyer's mixed dentition analysis in Maharashtrian children of India
IP INNOVATIVE PUBLICATION Pvt. Ltd, 2017
Background and Objective: The objective of present study is to evaluate the applicability of Moyer's mixed dentition analysis in Maharashtrian children of India. Materials and Method: Present study consist sample of 200 (100 females and 100 males) Maharashtrian children of India. All participants were in the age group of 13 to 16 years old. Children selected were having fully erupted all permanent teeth. Actual mesiodistal dimensions of four permanent mandibular incisors, upper and lower canines, and premolars of right and left sides were measured using digital vernier caliper which had a resolution of 0.01mm. These all measurements were then averaged. Statistical Analysis: The statistical analysis of obtained data was performed using SPSS 20.0. Student t test was used to compare between actual measurements and predicted values obtained with the Moyer's prediction tables. To find out the accuracy of the formed prediction equations the coefficient of determination (r 2) was calculated. To determine the validity of the proposed equations standard error of estimate (SEE) was calculated. Results: The comparable differences found between the actual and predicted values of moyer's prediction table were statistically very highly significant in males and females (P < 0.000). No statistical significant difference was seen at male mandibular 75 th percentile and female maxillary 50 th percentile between the actual measured findings and moyers table. Conclusion: There was comparable and statistically highly significant difference found between moyer's prediction measurements and measurements found in present study. Study on larger sample is required to test the accuracy of the predicted equation.
Evaluation of mixed dentition analyses in north Indian population: A comparative study
Contemporary clinical dentistry, 2014
Mixed dentition regression equations analyses (Moyers, Tanaka-Johnston) are based on European population, reliability of these methods is questionable over other population. The present study was conducted on total 260 study models. This study was done in two phases. In the first phase, linear regression equations were made. In the second phase, comparison of actual values of sum of mesiodistal width of canine, first and second premolars with the predicted values proposed by Moyers, Tanaka-Johnston, and the new proposed mixed dentition analysis for North Indian population were made. Set of four linear regression equations for predicting sum of mesiodistal width of permanent canine, first premolar and second premolar in North Indian population from sum of mesiodistal width of mandibular incisors and mandibular first molars, were proposed as; (a) for males, maxillary arch, Y = 2.9 + 0.40X, (b) mandibular arch Y = 3.91 + 0.37X (c) for females, maxillary arch Y = 0.56 + 0.45X (d) mandib...
Mixed dentition space analysis - a review
Review article, 2012
During mixed dentition period discrepancy between spaces available and required in the arch is predicted so that teeth can erupt freely with good alignment. Mixed dentition space analysis is done for this purpose in which size of unerupted canine and premolars is predicted. Accurate prediction is very important regarding correct orthodontic diagnosis and treatment planning. Prediction equation and or tables based on size of already erupted permanent teeth are the most widely used methods. Tooth size varies in different racial and ethnic groups and among genders so prediction equation and tables specific to each population for both male and female must be made. Mandibular incisors; combination of mandibular incisors and mandibular 1st molars; and mandibular incisors and maxillary 1st molars have been used worldwide. Recent studies have reported that mandibular incisors are not the best predictors and sum of mandibular incisors and maxillary 1st molars are even more accurate predictor for the estimation of size of unerupted teeth. In Pakistani population combination of mandibular incisors and maxillary 1st molar have not been employed so study must be conducted to estimate which combination of group of teeth is more accurate for the estimation of size of unerupted canine and premolars in local population
Applicability of two methods of mixed dentition analysis in a contemporary Indian population sample
European journal of paediatric dentistry : official journal of European Academy of Paediatric Dentistry, 2012
More than 10 years experience in implementing the Tanaka Johnston and Moyers methods has shown that they overestimate the sizes of unerupted canines and premolars when used in populations other than the Caucasian. This study was designed to assess the applicability of the two most commonly used methods of mixed dentition analysis and to attempt to derive a more accurate and precise formula to predict the sizes of the unerupted premolars and canines in a sample of Indian population. The sample included 200 study models (100 male, 100 female). Tanaka Johnston's and Moyer's equations were applied to this sample and the mean differences between the actual and estimated tooth widths were determined. New regression equations were derived using lower first molars and incisors as the predictors. The mean difference between the actual and estimated values of canines and premolars using Tanaka Johnston's and Moyers methods were clinically and statistically significant. Therefore n...
International Journal of Medical and Health Research, 2020
Introduction: During othodontic treatment planning, accurate space analysis is very important in this period. The present study was planned to determine the mesiodistal widths of lower permanent canines and premolars from Tanaka-Johnston, Moyers 'and Bernabé E & Flores-Mir C mixed dentition analysis; to determine the correlation coefficients and the new prediction equation for Sri Ganganagar population. Materials and method: 100 children aged 11-16 years of Jammu city were randomly selected. The mesiodistal width of permanent incisors, canines, premolars and molars was measured with the help of digital vernier caliper with an accuracy of ±0.01mm. The measurements of canines and premolars were summed up and compared with those derived from Tanaka and Johnston equations, Moyers probability tables and Bernabé & Flores-Mir equations. Results: All the three methods overestimated the actual sum of permanent canine and premolars in both the arches in our population. Conclusion: The predicted values obtained from all the three methods overestimated the actual values. Results derived are more clinically appropriate and reliable for the prediction of tooth size of unrupted permanent canines and premolars, to determine the discrepancy between the available and required space in the dental arch. As this equation is limited only to the city population of school going children, further studies are required incorporating large population size to draw appropriate results.
Mixed Dentition Space Analysis in Adolescents of Lahore, Pakistan
2016
Mixed dentition space analysis is very important in orthodontic diagnosis and treatment planning. The present study evaluated prediction methods for the estimation of size of unerupted canine & premolars, and observed any sexual dimorphism in tooth size in a local population. A cross-sectional study was conducted on 192 boys and 192 girls aged 13-15 years who met the inclusion /exclusion criteria from schools of Lahore, Pakistan. Dental impressions of both arches were made and mesiodistal widths of teeth were measured with digital vernier caliper. Students t-test, Pearson correlation coefficient analysis and simple linear regression analysis was used to statistically compare tooth size differences in arches, among genders and predict maxillary and mandibular canine and premolars width based on sum of four mandibular incisors; sum of mandibular incisors and first molar; and sum of mandibular incisors and maxillary first molar. New regression equation was formulated for each arch and ...
Mixed dentition space analysis for Indonesian Javanese children
Pediatric Dental Journal, 2006
The purposes of this study were to determine the applicability of Moyers and Tanaka-Johnston prediction methods for Indonesian Javanese children, and to develop new regression equations for predicting the size of the canine-premolar segment based on the normative standard of mesio-distal crown diameters of the permanent teeth in Indonesian children. Two hundred and eighty five sets of dental casts of the permanent dentition were obtained from Indonesian Javanese children in Yogyakarta, Indonesia during 2000-2001. There were 143 males and 142 females aged 11.1 to 14.9 years. The mesio-distal crown diameters were measured with calipers to an accuracy of 0.05 mm. The statistical analyses were performed using computer software (SPSS 9.0 for Windows). This study confirmed that the use of Moyers and Tanaka-Johnston prediction methods for mixed dentition analysis among Indonesian Javanese children were unsuitable. Both methods underestimated the size of canine-premolar segments, with exception of the Tanaka-Johnston method in females. The combination of maxillary first molars and mandibular lateral incisors (͚ ʲ 6 2 ʲ͉ ʲ 2 6 ʲ) showed relatively higher correlation with the actual size of ͚ 3 4 5. The development of new linear regression equations with predictor ͚ ʲ 6 2 ʲ͉ ʲ 2 6 ʲ for predicting the size of the canine-premolar segment was based on the normative standard of mesio-distal crown diameters of permanent teeth in Indonesian Javanese children. The newly developed regression equations are more accurate than the regression equation that uses predictor ͚ ʲ 2 1 ʲ͉ ʲ 1 2 ʲ for mixed dentition analysis among Indonesian Javanese. One of the important considerations during the period of mixed dentition is the discrepancy between available space and required space for unerupted permanent canine, first and second premolars. For determining an accurate occlusal guidance or orthodontic treatment plan, some prediction methods for estimating the size of the unerupted canine-premolar segment have been established. Among these, the Moyers 4) and Tanaka-Johnston 5) methods are the most widely used, although other methods 6-9) , using radiography, are suggested to be more accurate 6-9). Moyers and Tanaka-Johnston methods are straight forward, providing a high degree of accuracy,