Vertical relationships between the divergence angle of maxillary molar roots and the maxillary sinus floor: A cone-beam computed tomography (CBCT) study oleh Ali Robaian, Nasser Raqe Alqhtani, Ziyad Ibrahim Alghomlas, Adel Alzahrani, Abdulrahman Khalid Almalki, Ali Al Rafedah, Abdullatif Al Abdulsalam, Khaled M. Alzahrani