[Prediction of maxillary canine impaction with panoramic radiographs]

ABSTRACT

The incidence of maxillary canine impaction is between 1% and 3% populations. Determining whether impaction will occur and timing the treatment modalities that are affected by impacted canine [s] are paramount for a successful out come, panoramic radiograph to identify canine impaction; not only is economical but treatment result will be more desirable. The aim of this investigation was to develop a reliable method for predictors of maxillary canine impaction on a panoramic radiograph. Sixty - four panoramic radiographs of mixed dentition patients were inspected to belong to two groups of patient with impacted and not impacted canines. 88 were found with no impaction and 40 with impacted canines. For predicting canine impaction panoramic radiographs were inspected for two indices 1- The erupted lateral tooth were divided to fourfold zone from 4 to 1 sectors in mesiodistal dimension; therefore identified the unerupted permanent canines cusp tip location related to the erupted permanent lateral. 2-The internal angle between the long axis of the unerupted canine and a horizontal line between superior points of condyles was measured. The data were analyzed by descriptive statistics and logistic regression. All of not impacted teeth were found in sector I and II. [69.3% in sector I and 30.7% were placed in sector II]. 17.5% of impacted teeth were in sector I, 42.5% in sector II, 27.5% in sector Ill and 12.5% were placed in sector IV. Furthermore the mean angle for non impacted teeth was 74.72' and for impacted teeth was 67.12'. The location of canine cusp tip in panoramic radiograph is the most important factor in predicting probable impaction, but often, the angle of canine is not worth