Fig. 1 | British Dental Journal

Fig. 1

From: The palatal displaced maxillary canine: early diagnosis and interceptive correction - a guideline for the general dental practitioner

Fig. 1

Three criteria for assessing the position of the maxillary canine tooth on a radiograph. 1st criterion: horizontal position of the canine crown in relation to a vertical line drawn between the maxillary central incisors (mid-sagittal plane/midline) and based upon five vertical sectors: sector one, primary canine; sectors two and three, bisecting the midline of the maxillary lateral incisor (distally and mesially, respectively); and sectors four and five, bisecting the midline of the maxillary central incisor (distally and mesially, respectively). 2nd criterion: alpha angle (a), the angulation of the long axis of the canine to a vertical line drawn between the maxillary central incisors (mid-sagittal plane). 3rd criterion: height (h) of the canine cusp tip to the occlusal plane. The higher the sector position (particularly beyond sector two), the greater the alpha angle and higher the canine, the poorer the prognosis for eruption

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