The Relationship Between The Topograph Of Maxillary Sinus Floor And The Position Of Root Apicals Of Maxillary Posterior Teeth With Cone-beam Computed Tomography

Objective:To evaluated the relationship between the topograph of maxillary sinus floor and the position of root apicals of maxillary posterior teeth with cone-beam computed tomography, issued a warning to the medical treatment that affecting lateral maxillary area.Methods:This study measured the distance between the topograph of maxillary sinus floor and the position of 784 root apicals of Maxillary posterior teeth on 98 sides in 53 patients, on the 3-dimensional computed tomography images using CBCT. The vertical relationship between the maxillary sinus and the root apicals of Maxillary posterior teeth were classified into 4 categories in Shahbazian M’s way. And the Pearson analysis correlation between the length of maxillary sinus floor and the mean distance were proceed.Results: The vertical distance of bucaldistal root apicals of first maxillary molar were the shortest, and had an average of (0.44±3.1) mm (p<0.05). Among 4 types,16.9% of total for type IV that were most likely to cause maxillary sinusitis,the buccaldistal apicals of first molar appeared type IV most. A positive correlation were shown between mean vertical distance and the length of maxillary sinus floor (r=-0.83), pneumatic maxillary sinus had a higher risk of having a intimate relationship between molar and premolar apical and maxillary sinus.Conclusions:It was essential to evaluated the topographic of maxillary sinus via CBCT before and after any medical treatment that might affects this area, even for asymptomatic patients.