A patient complains of the alveolar process deformation on the left upper jaw. Objectively: the crown of the 25 tooth is destroyed with cariosity. X-ray image of the paranasal sinuses shows the left one to have veil-like shading with clear dome-shaped margin. X-ray image of the crown of the 25 tooth shows absence of the periodontal fissure at the palatal root apex. What is the most likely diagnosis?