title: Predicting the size of unerupted canines and premolars using primary maxillary first molar.
abstract: OBJECTIVE
  One of the most important aspects of interceptive orthodontic diagnosis and treatment planning is space analysis. To date all methods use the size of permanent teeth to predict the dimensions of unerupted teeth. The aim of this study was to predict the permanent teeth size using maxillary primary first molar.
  
  
  METHODS
  The size of primary maxillary first molars and permanent canines and premolars of 80 subjects was measured on their dental casts. Regression equations were determined between the size of primary maxillary first molars and permanent canines and premolars.
  
  
  RESULTS
  The new regression equations for predicting permanent tooth size in the maxilla and mandible were, respectively, Y = 2.2X + 13 and Y = 2.4X + 9.5 among females and Y = 2.7X + 5.5 and Y = 2.4X + 9.5 among males.
  
  
  CONCLUSIONS
  The results show that the primary maxillary first molar size can be used to predict the size of unerupted permanent teeth.
authors.affiliation: Department of Pediatric Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Velenjak St., 4739, Tehran, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Mokhtari
authors.forename: I
authors.initials: I
authors.lastname: Sanati
authors.forename: N
authors.initials: N
authors.lastname: Shafizadeh
authors.forename: B
authors.initials: B
authors.lastname: Seraj
authors.forename: B
authors.initials: B
authors.lastname: Khosravanifard
mesh_terms: D000465:Algorithms; D001641:Bicuspid / Q000033:anatomy & histology; D002138:Calibration; D003430:Cross-Sectional Studies; D003481:Cuspid / Q000033:anatomy & histology*; D003724:Dental Arch / Q000033:anatomy & histology; D003818:Dentition, Mixed; D005260:Female; D005544:Forecasting; D006801:Humans; D008297:Male; D008963:Molar / Q000033:anatomy & histology*; D009811:Odontometry / Q000706:statistics & numerical data*; D014094:Tooth, Deciduous / Q000033:anatomy & histology*; D014097:Tooth, Unerupted / Q000033:anatomy & histology*