A New Regression Equation Proposed For Mixed Dentition Analysis in Chhattisgarh, Central India Population (original) (raw)
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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...
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...
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 different mixed dentition analysis in Lucknow population
Aims: The aim of this study was to test the reliability of Moyer's and Tanaka‑Johnston method of mixed dentition analysis among Lucknow population and also derive a linear regression equation that would predict sum of mesiodistal widths of upper and lower canines and premolars for both sexes. Setting and Design: Moyer's and Tanaka‑Johnston mixed dentition space analysis were developed from a sample of North European descent children. Hence, it becomes questionable when applied to individuals with different ethnic origin. Materials and Methods: Actual mesiodistal widths of permanent upper and lower incisors, canines, and premolars were recorded on 100 dental casts for both sexes using digital Vernier caliper nearest of 0.02 mm. Predicted values of mesiodistal widths of permanent upper and lower canines and premolars were obtained using Moyer's probability analysis at the 75 th percentile and Tanaka‑Johnston method. Both actual and predicted values for both sexes were put to statistical evaluation using student " t " test and unpaired " t " test. Results: Differences between the actual and predicted values of upper and lower permanent canines and premolars were statistically significant in both sexes (P < 0.05) for both Moyer's and Tanaka‑Johnston mixed dentition analysis. Four linear regression, equations were developed for both sexes to predict mesiodistal widths of erupting upper and lower permanent canines and premolars using the lower incisors. No significant difference was observed when the regression equations were applied. Conclusion: Predictions from linear regression equations matched well with the data obtained from the samples of the present study for both males and females of Lucknow population.
Prediction of Mesio-distal width of Canines and premolars in a sample of north Indian population
Indian Journal Of Dental Advancements, 2011
Background: This study was done to evaluate the applicability of the Tanaka-Johnston method of prediction of mesiodistal widths of permanent canines and premolars in North Indian population. Methods: 202 dental casts were obtained and mesiodistal widths of permanent lower incisors, canines and premolars were recorded using vernier calipers to nearest of 0.02mm. The predicted values of mesiodistal widths of permanent canines and premolars were obtained using Tanaka Johnston method. These values were put to statistical evaluation using Student't' test and Pearson's coefficient of correlation. Results: The results revealed that the differences between the actual and predicted values of permanent canines and premolars were statistically significant in maxilla and mandible in both sexes (p<0.05). Conclusion: The present study suggests that Tanaka Johnston mixed dentition analysis overpredicted the mesiodistal dimension of unerupted premolars and canines in both male and female subjects and tooth dimension show sexual dimorphism with males having larger mesiodistal tooth dimensions than females
Mixed Dentition Analysis in and around Kanpur City: An Existential and Illustrative Study
International Journal of Clinical Pediatric Dentistry
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.
Mixed Dentition Analysis: A Revised Equation for New Generation
Dental Journal of Advance Studies
Abstract: Aim: Racial difference is an important factor in tooth size variability. The present study was thus aimed to assess the applicability of Tanaka and Johnston method for predicting the mesiodistal dimensions of canine and premolars in children of Panchkula, Haryana. Methods: Dental study models of 200 children were analysed to check the applicability of Tanaka and Johnston method of mixed dentition analysis. Results: Differences have been found in the means of actual dimensions of canine & premolars and values derived by regression equation of Tanaka and Johnston by Student’s t-test and therefore formulated a new equation. Conclusion: Tooth size differences amongst races are an important variable that must be considered before the formulation of prediction equation. The proposed new prediction equations derived in the present study are possibly more appropriate to be used for mixed dentition analysis in a population of Panchkula, Haryana.
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.
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.