MIXED DENTITION ANALYSIS: A REVISED EQUATION FOR NEW GENERATION Varun Dua , Avninder Kaur , Manjeet Kaur 1 2 3 1 2 3 Sr. Lecturer, Department of Pediatric and Preventive Dentistry, Darshan Dental College and Hospital, Rajasthan, India Bhojia Dental College and Hospital, Himachal Pradesh, India BRS Institute of Dental Sciences, Haryana, India Professor & Head, Department of Pediatric and Preventive Dentistry, Professor, Department of Pediatric and Preventive Dentistry, Corresponding Author: Avninder Kaur Email: Avninder21@yahoo.com Received: 30 Aug. 2014 Accepted:1 Dec. 2014 Online: 23 Jan. 2015 th st rd ORIGINAL ARTICLE www.djas.co.in ISSN No-2321-1482 DJAS 2(III), , 2014 All rights are reserved 150-156 Dental JOURNAL Dental JOURNAL of A d v a n c e S t u d i e s ABSTRACT Abstract: Aim: Methods: Results: Conclusion: Key Words: 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. Dental study models of 200 children were analysed to check the applicability of Tanaka and Johnston method of mixed dentition analysis. 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. 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. Tanaka and Johnston, mixed dentition analysis, tooth sizes, mesiodistal dimensions, prediction equation. INTRODUCTION Pediatric dentistry is increasingly shifting from a conservative-restorative approach, towards a concept of total pediatric patient care, including early diagnosis and correction of malocclusion, developing during the early or mixed dentition period. During this crucial period, the pediatric dentist is responsible to provide an opinion of the effect of this malocclusion, if any, on the ultimate occlusal status of the permanent dentition. Fundamental to orthodontic diagnosis and treatment planning during mixed dentition period is an assessment of the degree of future crowding or spacing in the teeth. If this prediction is accurately made, many of the malocclusions developing in the mixed dentition period can be mitigated in severity or eliminated altogether by early and timely intervention. An accurate mixed dentition analysis requires accurate prediction of the mesiodistal crown dimensions of the 1 2 unerupted maxillary and mandibular canines & premolars. Two broad approaches have been used for predicting the mesiodistal crown dimensions of unerupted teeth; the radiographic method and non-radiographic methods. The radiographic methods are based on the measurement of the unerupted teeth on radiographs. The non-radiographic methods are based on the measurement of already erupted teeth on dental study casts, or directly in the mouth and co- relating them to the mesiodistal dimensions of the unerupted canines & premolars using prediction tables. Although some studies have shown the radiographic methods to be more accurate. but they have inherent limitations which may result from the quality of the X-ray films and the radiographic technique used. Ballard and Wylie stated that unless an exact radiographic technique with good quality films is used, an accurate estimate of the unerupted tooth widths will be difficult to 3,4,5 6,7,8,9,10,11 12,13 6 150