Different manifestations of class II division 2 incisor retroclination and their association with dental anomalies

• Published in: Journal of orthodontics Vol. 40; no. 4; pp. 299 - 306
• Main Authors: Pereira, Pedro Mariano, Ferreira, Afonso Pinhão, Tavares, Purificação, Braga, Ana Cristina
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis 01-12-2013
• Subjects: Adolescent; Adult; agenesis; Anodontia - epidemiology; Child; Class II division 2; Cuspid - pathology; dental anomalies; Dentistry; Female; Humans; impacted tooth; Incisor - abnormalities; Incisor - pathology; incisor retroclinacion; Male; Malocclusion, Angle Class II - epidemiology; microdontia; Middle Aged; Molar, Third - abnormalities; Portugal - epidemiology; Prevalence; Retrospective Studies; Tooth Abnormalities - epidemiology; Tooth Eruption, Ectopic - epidemiology; Tooth, Impacted - epidemiology; Tooth, Supernumerary - epidemiology; Young Adult; Portugal; incisor retroclinacion; Class II division 2; microdontia; agenesis; dental anomalies; impacted tooth
• DOI: 10.1179/1465313313Y.0000000067
• EISSN: 1465-3133
• ISSN: 1465-3125

Objective: To investigate whether there is an association between dental developmental anomalies (DDAs) and different manifestations of class II division 2 (CII/2) malocclusion incisor retroclination.
Design: Retrospective comparative study.
Setting: Private orthodontic practice in the regions of Lisbon and Porto, Portugal.
Subjects and methods: The sample comprised 115 CII/2 malocclusions distributed into two groups on the basis of incisor retroclination: Group I composed of 48 CII/2 with retroclination exclusively of both maxillary central incisors; Group II composed of 67 CII/2 with retroclination of all four maxillary incisors. Using the initial orthodontic records, it was determined for each patient the presence of the following DDAs: tooth impaction, tooth agenesis, maxillary lateral incisor microdontia, tooth transpositions and supernumerary teeth.
Results: Fifty-five per cent of patients were diagnosed with at least one of the DDAs studied. In the total sample the prevalence rates were: 20.0% of palatal maxillary canine impaction, 27.4% of third molar agenesis, and 15.7% of maxillary lateral incisor microdontia. No patient exhibited any transposition or supernumerary teeth. The distribution of the DDAs studied by groups revealed a strong association of palatal canine impaction, tooth agenesis and maxillary lateral incisor microdontia with Group II but not with Group I.
Conclusion: The association of DDAs with CII/2 malocclusion is not common to all types of maxillary incisor retroclination, suggesting different etiologic factors among the different manifestations of CII/2 incisor retroclination.