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Progress in Orthodontics
Fig. 1 | Progress in Orthodontics

Fig. 1

From: Optimal sites for orthodontic anchor screw placement using panoramic images: risk of maxillary sinus perforation and contact with adjacent tooth roots during screw placement

Fig. 1

Classification of maxillary sinus morphology on panoramic images. On panoramic images, the maxillary sinus morphology was classified into two types: one in which the sinus floor was depressed such that it was adjacent to the alveolar bone between the maxillary molars (depressed sinus type) and the other in which it was not depressed (non-depressed sinus type). The depressed sinus type was further classified according to the sinus floor morphology into two types: the sawtooth-like depression type and the funnel-like depression type

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