An Analysis of The Relationship between The Maxillary Molars and The maxillary sinus floor in Adult Patient Using Cone-beam Computed Tomography

Background: The aim of the study was to evaluate the anatomical relationship between the maxillary molars and the maxillary sinus by using cone beam computed tomography (CBCT). Methods A database of maxillary molars were obtained from 91 adult patients by means of images of CBCT. The internal angle, the alveolar bone width, and the distance between root apex and the wall of maxillary sinus were measured by CBCT. The vertical relationship between the maxillary molars and the maxillary sinus were analysed. Vertical relationship of the maxillary sinus was further evaluated. Results The value of the internal angle of maxillary third molar is 17.2 ± 11.5°. The width of the alveolar bone of third molar is 8.2 ± 1.7mm. Type III, IV and V were the most common relationship in the first and second molars. Type V and I were most frequently observed in the first and second molars. The inner angle of the second molar is larger than that of the first molar. The maxillary first molar had the smallest mean alveolar bone width, and the third molar had the largest average. Conclusion This study will provide reference for clinical practice, especially for root canal treatment and tooth implants.