Typically, the occlusal radiograph is especially useful in the following cases:​To locate precisely roots and supernumerary, unerupted, and impacted teeth (this technique is especially useful for impacted ​canines and third molars)​. To localize foreign bodies in the jaws and stones in the ducts of sublingual and submandibular glands​. To demonstrate and evaluate the integrity of the anterior, medial, and lateral outlines of the maxillary sinus​.Ref: ORAL RADIOLOGY Principles and Interpretation,Stuart C. White,Michael J. Pharoah Edition 7 page no 126