The form and the disposition of the lower border of the maxillary sinus at the physiological, mesial and distal occlusion of dentition

We have studied 99 lateral teleroentgenograms of the scull made in patients aged 20 to 45. There were 48 patients with physiological occlusion of dentition, 36 patients with distal occlusion and 15 patients with mesial occlusion of dentition. We have identified four basic forms of the lower boundary of the maxillary sinus and 3 types of its vertical distance from the basis of maxilla (line ANS-PNS) in the portions corresponding to the position of the premolars’ and molars’ root tips. We have compared the frequency of the location of the posterior teeth’s root tips above the lower boundary of the sinus for various types of dental occlusion. This analysis is important for forecasting outcomes of orthodontic mesial/distal movement of posterior teeth, as well as for replacement of defects of the upper denture by implant-supported prostheses.