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Fig. 3 | Head & Face Medicine

Fig. 3

From: Advocacy of diagnostic criteria for maxillary incisive canal cysts based on alteration of normal maxillary incisive canals according to aging in Japanese populations

Fig. 3

Whether the courses of the maxillary incisive canals are straight or curved is also noted based on the curvature of the palatal wall of the canals. Therefore, four types of incisive canals based on curvature are noted: vertical (a), vertical-curved (b), slanted (c), and slanted-curved (d). The slant angles of the maxillary incisive canals are the angles measured between the floors of the nasal fossa and the long axis of the maxillary incisive canals, which are considered to be the lines joining the midpoints of the antero-posterior diameters at the level of the hard palate

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