title: Deciding factors in the treatment of Class II division 1 cases with and without single-jaw extractions.
abstract: Extraction of two upper premolars in Class II division 1 occlusions often constitutes a therapeutic compromise for the orthodontic practitioner. The aim of our study was to compare the initial occlusal and cephalometric severity of Class II division 1 malocclusions in two groups of patients treated with and without extraction of two upper premolars and thus determine the factor or factors determining this therapeutic option. Examination of the casts and cephalometric analysis of 31 patients presenting a Class II division 1 malocclusion were made. The non-extraction group comprised 16 patients and the group undergoing extraction of two upper premolars comprised 15 patients. Discriminant analysis was applied using binary decision trees in order to identify the variable which best distinguished the two groups. Maxillary incisor-canine crowding was selected to discriminate between the patients at pretreatment stage; 93.5% of the patients were correctly classified using this factor.
authors.affiliation: Service d'Orthopédie Dento-Faciale, Faculté de Médecine Dentaire de Rabat, Université Mohamed V Souissi, Rabat, Morocco. Electronic address: afafeve@hotmail.com.
authors.forename: Houb-Dine
authors.initials: HD
authors.lastname: Afaf
authors.affiliation: Service d'Orthopédie Dento-Faciale, Faculté de Médecine Dentaire de Rabat, Université Mohamed V Souissi, Rabat, Morocco.
authors.forename: Loubna
authors.initials: L
authors.lastname: Bahije
authors.affiliation: Service d'Orthopédie Dento-Faciale, Faculté de Médecine Dentaire de Rabat, Université Mohamed V Souissi, Rabat, Morocco.
authors.forename: Fatima
authors.initials: F
authors.lastname: Zaoui
authors.affiliation: Laboratoire de Biostatistique, de Recherche Clinique et d'Épidémiologie, Faculté de Médecine et de Pharmacie, Université Mohamed V Souissi, Rabat, Morocco.
authors.forename: Redouane
authors.initials: R
authors.lastname: Abouqal
authors.affiliation: Service d'Orthopédie Dento-Faciale, Faculté de Médecine Dentaire de Rabat, Université Mohamed V Souissi, Rabat, Morocco.
authors.forename: Wiam
authors.initials: W
authors.lastname: Rerhrhaye
mesh_terms: D000293:Adolescent; D001641:Bicuspid / Q000601:surgery; D002508:Cephalometry / Q000379:methods; D002648:Child; D003481:Cuspid / Q000473:pathology; D003657:Decision Making; D003663:Decision Trees; D016002:Discriminant Analysis; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology / Q000601:surgery; D003765:Models, Dental; D057887:Overbite / Q000628:therapy; D010347:Patient Care Planning; D011237:Predictive Value of Tests; D012372:ROC Curve; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D012737:Sex Factors; D019291:Skull Base / Q000473:pathology; D014081:Tooth Extraction / Q000379:methods*; D055815:Young Adult
keywords: Class II division 1; Decision tree; Extraction of maxillary premolars