title: Applicability of regression equation using widths of mandibular permanent first molars and incisors as a predictor of widths of mandibular canines and premolars in contemporary Indian population.
abstract: BACKGROUND
  Predicting the size of unerupted teeth during the mixed dentition period is a critical factor in managing the developing occlusion. Different studies found that the combined width of only the four mandibular permanent incisors is not a good predictor of the sum of unerupted mandibular permanent canines and premolars (SPCP). In 2007, Melgaço et al. developed a new method for SPCP by measuring the sum of the mandibular first permanent molars and four mandibular permanent incisors (SMI).
  
  
  OBJECTIVE
  It was aimed to evaluate the accuracy of this new method in comparison with Moyers' mixed dentition analysis table in contemporary Indian population.
  
  
  METHODS
  Sixty boys and 60 girls from Gandhinagar district (age ranged from 12 to 14 years) were included.
  
  
  METHODS
  The mesiodistal crown widths of all fully erupted teeth were measured with digital vernier callipers and the odontometric values obtained were then subjected to statistical and linear regression analysis.
  
  
  RESULTS
  Student's unpaired t-test gave statistically significant difference between the original values of teeth and the values obtained by Melgaço's prediction equation as well as Moyers' mixed dentition analysis table (P < 0.001). High values of correlation (r = 0.77) and determination coefficients (r2 = 0.59) were found while considering Melgaço's method. Also, no statistically significant difference was found between the tooth sizes of males and females.
  
  
  CONCLUSIONS
  From this study, it can be evaluated that Melgaço's method gives better prediction and a simplified equation Y = 0.925X can be suggested for the present population.
authors.affiliation: Department of Pedodontics and Preventive Dentistry, College of Dental Sciences and Research Centre, Ahmedabad, India.
authors.forename: Shalin
authors.initials: S
authors.lastname: Shah
authors.forename: Vijay
authors.initials: V
authors.lastname: Bhaskar
authors.forename: Karthik
authors.initials: K
authors.lastname: Venkataraghvan
authors.forename: Prashant
authors.initials: P
authors.lastname: Choudhary
authors.forename: Ganesh
authors.initials: G
authors.lastname: Mahadevan
authors.forename: Krishna
authors.initials: K
authors.lastname: Trivedi
mesh_terms: D000293:Adolescent; D001641:Bicuspid / Q000033:anatomy & histology; D002648:Child; D003481:Cuspid / Q000033:anatomy & histology; D003761:Dental Impression Technique; D003818:Dentition, Mixed; D005260:Female; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology; D007194:India; D016014:Linear Models; D008297:Male; D008334:Mandible / Q000033:anatomy & histology; D008963:Molar / Q000033:anatomy & histology; D009811:Odontometry / Q000379:methods*; D011237:Predictive Value of Tests; D012016:Reference Values; D012424:Rural Population; D019228:Tooth Crown / Q000033:anatomy & histology; D014097:Tooth, Unerupted