3D Relationship of Maxillary Posterior Teeth and Sinus Floor for Immediate Extraction Implant Placement - Abstract
The objective of the study was to analyze the anatomical relationship between the sinus floor and the root apexes of maxillary premolars and molars to evaluate the amount of basal bone available for immediate extraction implant placement. Study Design: Maxillary arches Cone-Beam Computerized Tomographic (CBCT) scans taken at one dental clinic were analyzed. The sub-sinusal bone height (SBH) in the premolar region was measured, in the first and second molar area the inter-radicular septum bone height (ISBH) was also measured. Results: Six hundred (600) CBCT scans were examined. In the first premolar region the findings were: 1.5% root apex inside the sinus; in 4.9% it approximated the sinus floor; in 17.5% distance varied between 1 and 3mm; 36.4% distance between 3 and 7mm; and 39.6% >7mm. In the second premolar region the findings were: 13.9% inside the sinus; 11.8% approximating the sinus floor; 30.8% distance 1-3mm; 28.3% distance 3-7 mm; 15.1% >7mm. The first molar area showed 26.2% ISBH <4mm, 38.3% ISBH of 4 - 7 mm, 35.4% ISBH >7 mm. The second molar area showed 14.3% ISBH <4mm, 46.2% ISBH of 4 - 7 mm, 39.4% ISBH >7 mm. Conclusion: Pre-operatory tridimensional radiological diagnosis is essential to safely insert an implant in fresh extraction sockets of maxillary premolars and molars in order to avoid complications such as sinus floor perforation.