Abstract
The aim of this study was to examine the possibility of the spontaneous eruption of displaced unerupted maxillary canines after the extraction of the deciduous canine and dental arch expansion and to determine the impact of initial canine position on treatment success rate. Materials and METHODS. The study sample included 50 patients (mean age, 13.5 years [SD, 2.2]) with unilaterally displaced unerupted maxillary canines. Deciduous canines were extracted, and the space for displaced canine was created at the beginning of the study. The follow-up period for the spontaneous eruption was 12 months. The initial vertical, horizontal, labio-palatal position and angle of inclination to the midline of the displaced canine were assessed on panoramic radiographs. RESULTS. Only 42% of displaced canines erupted spontaneously within one-year period (52.9% of labially displaced canines and 36.4% of palatally displaced canines). A significant difference of inclination was determined between spontaneously erupted and unerupted teeth in the labially displaced canine group (P<0.01), with no difference in the palatally displaced canine group. The receiver operating characteristic curve analysis showed that the critical angle of inclination for the spontaneous eruption of the retained canine was 20º (sensitivity 0.759; specificity 0.571; P<0.05). The majority of unerupted canines (75.9%) were inclined more than 20º. The initial height of canine was crucial for spontaneous eruption (sensitivity 0.966; specificity 0.81; P<0.001). This was true for both palatal and labial cases. CONCLUSIONS. The initial vertical position of the labially and palatally displaced canines and the inclination of the labially displaced canines were the most important predictors for spontaneous eruption of the cuspid.
Highlights
Ectopic eruption of the permanent maxillary canines is a frequent anomaly in the development of dentition
The receiver operating characteristic curve analysis showed that the critical angle of inclination for the spontaneous eruption of the retained canine was 20o
The aim of this study was to examine the possibility of the spontaneous eruption of displaced unerupted maxillary canines after the extraction of the deciduous canine and dental arch expansion and to determine the impact of initial canine position on treatment success rate
Summary
Ectopic eruption of the permanent maxillary canines is a frequent anomaly in the development of dentition. The displacement of developing maxillary canines can cause tooth impaction requiring surgical and orthodontic treatment. There is no clear definition between impaction and displacement leading to the delayed eruption of maxillary canines. Lindauer et al [1] defined a canine as being impacted if it was unerupted after complete root development or if the contralateral tooth was erupted for at least 6 months with complete root formation. Thilander and Jakobsson [2] defined an impacted tooth as one “whose eruption is considerably delayed, and for which there is clinical or radiographic evidence that further eruption may not take place.”. The differentiation between maxillary canine impaction and delayed eruption is critical for the treatment strategy
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