title: Predictive model of third molar eruption after second molar extraction.
abstract: BACKGROUND
  Extraction of second permanent molars is an option for providing space in orthodontic treatment. Although many articles have described its impact on the outcome, there are few data on the prognosis of the eruption of the adjacent third molars. The aims of this investigation were to provide predictive models of eruption of third molars after second permanent molar extraction and to validate them.
  
  
  METHODS
  A total of 48 patients (ages, 11-23 years) who had 128 second permanent molars (54 maxillary, 74 mandibular) extracted during orthodontic treatment were followed until eruption of the third molars was complete.
  
  
  CONCLUSIONS
  A lineal regression model predicted the final angle of the third molars with the permanent first molar by using the variables of initial angle, jaw, and the developmental stage of the third molar. A logistic regression model predicted the probability of correct eruption by using the variables of initial angle, jaw, sex, age, and the developmental stage of the third molar.
authors.affiliation: Department of Orthodontics; researcher, Bellvitge Institute of Biomedical Research, Barcelona, Spain.
authors.forename: Cristina
authors.initials: C
authors.lastname: De-la-Rosa-Gay
authors.forename: Eduard
authors.initials: E
authors.lastname: Valmaseda-Castellón
authors.forename: Cosme
authors.initials: C
authors.lastname: Gay-Escoda
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D005544:Forecasting; D006801:Humans; D016014:Linear Models; D008297:Male; D008954:Models, Biological; D008963:Molar / Q000601:surgery; D008964:Molar, Third / Q000000981:diagnostic imaging / Q000254:growth & development* / Q000503:physiopathology*; D011379:Prognosis; D011859:Radiography; D012189:Retrospective Studies; D014078:Tooth Eruption; D014081:Tooth Extraction; D055815:Young Adult