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Tooth size reduction and agenesis associated with palatally displaced canines
Marcelo Reis Fraga1, Robert Willer Farinazzo Vitral, Enio Tonani Mazzieiro
1Orthodontontic Department, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil.
Purpose:
This study determined the relationship between tooth-size reduction, agenesis and the occurrence of palatally displaced canines (PDCs). Emphasis was given to the association between anomalous and/or absent maxillary lateral incisors and PDCs.
Methods:
Pretreatment records of 66 consecutively treated orthodontic patients with PDCs and 66 controls were evaluated. Maximum mesiodistal (M-D) crown diameters were recorded for all teeth, except the second and third molars. Tooth agenesis was evaluated by radiographs. The level of significance was P<.05.
Results:
The occurrence of agenesis in the PDC sample was approximately 26%. Congenital absence of the lateral incisors was noted in 2 male subjects (3%). The occurrence of small lateral incisors was approximately 39%.
Conclusions:
Female subjects with palatally displaced canines showed significant overall reductions of the maximum mesiodistal widths for all teeth, except the mandibular first molars. Female PDC subjects with 1 or more congenitally absent teeth showed significant reductions in M-D diameters of the maxillary left lateral incisors, mandibular second premolars, and first molars in relation to the female PDC subjects with no absent teeth. The association between tooth agenesis and PDCs was not observed. There also was no significant association between adjacent anomalous and/or absent maxillary lateral incisors and PDCs.
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