title: New regression equations for predicting human teeth sizes.
abstract: BACKGROUND
  The aims of the study were; to evaluate the applicability of the Moyers and Tanaka-Johnston Methods to individuals with a Spanish ancestry, to propose new regression equations using the lower four permanent incisors as predictors for the sum of the widths of the lower permanent canine and premolars, and to compare the new data to those from other populations.
  
  
  METHODS
  A total of 359 Spanish ancestry adolescents were selected. Their dental casts were measured using a 2D computerized system. Real teeth measurements were compared with those predicted using Moyers probability tables and Tanaka and Johnston equations, and standard regression equations were then developed.
  
  
  RESULTS
  Results showed that Upper and Lower Canine and Premolar (UCPM, LCPM) predictions are quite different depending on the used method. Moyers tables can only be validly applied to a 75% percentile for the mandible in both, males and females, 85% in males and 90-92% in females.
  
  
  CONCLUSIONS
  Moyers predictions tend to underestimate UCPM and LCPM whereas Tanaka-Johnston predictions tend to overestimate them. Equations for estimating the combined width of the unerupted canine and premolars were; Male: UCPM = 12.68 + 0.42 LI and LCPM = 11.71 + 0.44 LI. Female: UCPM = 12.06 + 0.43LI and LCPM = 10.71 + 0.46 LI.
authors.affiliation: Orthodontics Department, Faculty of Dentistry and Medicine, University of Valencia, Gasco Oliag nº1, 46010, Valencia, Spain. vanessa.paredes@uv.es.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Paredes
authors.affiliation: Orthodontics Department, Faculty of Dentistry and Medicine, University of Valencia, Gasco Oliag nº1, 46010, Valencia, Spain. beatriz.tarazona@hotmail.com.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Tarazona
authors.affiliation: Orthodontics Department, Faculty of Dentistry and Medicine, University of Valencia, Gasco Oliag nº1, 46010, Valencia, Spain. natalia.zamora@uv.es.
authors.forename: Natalia
authors.initials: N
authors.lastname: Zamora
authors.affiliation: Physiology Department, Faculty of Medicine and Dentistry, University of Valencia, Spain, Valencia, Spain. rosa.m.cibrian@uv.es.
authors.forename: Rosa
authors.initials: R
authors.lastname: Cibrian
authors.affiliation: Orthodontics Department, Faculty of Dentistry and Medicine, University of Valencia, Gasco Oliag nº1, 46010, Valencia, Spain. jose.l.gandia@uv.es.
authors.forename: Jose Luis
authors.initials: JL
authors.lastname: Gandia
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001641:Bicuspid / Q000033:anatomy & histology* / Q000254:growth & development*; D002648:Child; D015331:Cohort Studies; D003481:Cuspid / Q000033:anatomy & histology* / Q000254:growth & development*; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D015588:Observer Variation; D009811:Odontometry / Q000379:methods*; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D012737:Sex Factors; D013030:Spain