title: A new approach to classify cleft lip and palate.
abstract: OBJECTIVE
  To propose a new method, which allows for a complete description of primary and secondary cleft palates, incorporating elements that are related to the palate, lip, and nose that will also reflect the complexity of this problem.
  
  
  METHODS
  To describe the type of cleft, two embryonic structures were considered: (1) the primary palate, formed by the prolabium, premaxilla, and columella and (2) the secondary palate, which begins at the incisive foramen and is formed by a horizontal portion of the maxilla, the horizontal portion of the palatine bones, and the soft palate. Anatomical characteristics to be considered were defined, and a new method is proposed to more fully describe any cleft.
  
  
  RESULTS
  A description of five cases was made using the method proposed in this work and compared with other published methods for the classification and description of clefts.
  
  
  CONCLUSIONS
  A mathematical expression was developed to characterize clefts of the primary palate, including the magnitude of palatal segment separation and the added complexity of bilateral clefts, yielding a numerical score that reflects overall complexity of the cleft. Clefts of the secondary palate are also considered in a separate score. Using this method, it is possible to incorporate elements that are not considered in other approaches and to describe all possible clefts that may exist.
authors.affiliation: Universidad Autónoma Metropolitana-Iztapalapa, Ingeniería Eléctrica, Av. Michoacán y La Purisima S/N Col. Vicentina C.P. 09340, D.F. México. posa@xanum.uam.mx.
authors.forename: M R
authors.initials: MR
authors.lastname: Ortiz-Posadas
authors.forename: L
authors.initials: L
authors.lastname: Vega-Alvarado
authors.forename: J
authors.initials: J
authors.lastname: Maya-Behar
mesh_terms: D000465:Algorithms; D002971:Cleft Lip / Q000145:classification* / Q000196:embryology; D002972:Cleft Palate / Q000145:classification* / Q000196:embryology; D006801:Humans; D008046:Lip / Q000196:embryology; D008437:Maxilla / Q000196:embryology; D009666:Nose / Q000002:abnormalities / Q000196:embryology; D010159:Palate / Q000196:embryology; D021362:Palate, Hard / Q000196:embryology; D010160:Palate, Soft / Q000196:embryology; D012720:Severity of Illness Index