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Measurement of the distance between the natural ostium (A) or accessory maxillary ostium (B) and the maxillary sinus floor located directly below the natural ostium or accessory maxillary ostium. The distance between the most inferior point of the natural ostium or accessory maxillary ostium and the maxillary sinus floor was measured on the same coronal plane as the inferior point of the natural ostium or accessory maxillary ostium.
