Proximity of maxillary posterior teeth roots to maxillary si
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The anatomical relationship between the floor of maxillary sinus and maxillary posterior teeth always possess a challenge in dentistry, especially during the endodontic and prosthetic procedure, extraction, or surgical removal involving maxillary posterior teeth which are close to maxillary sinus

The aim of the study was to investigate the proximity of maxillary posterior teeth roots to maxillary sinus and measure the distance of maxillary posterior teeth roots and the sinus floor as well as the thickness of bone between the roots and alveolar cortical bone using Denta scan®.

The study samples include Denta scan® images of fifty patients with normally erupted bilateral maxillary first premolar to maxillary second molar. The vertical relationship of each tooth root with maxillary sinus is classified into four types of Denta scan® images .The distance between the sinus floor and root, and the bone thickness between the root and alveolar cortical plate will be measured and analyzed.

In conclusion the buccal root of the maxillary molars was more commonly protruded into the maxillary sinus. Among the roots of maxillary posterior teeth, mesiobuccal root of first molar and palatal root of second premolar were found in close proximity to the floor of maxillary sinus. The bone thickness on the buccal aspect to the root was significantly thinner in the maxillary first premolar and maxillary first molar as compared to other maxillary posterior teeth roots.

Clinical significance of the knowledge of anatomical relationship between the maxillary posterior teeth and maxillary sinus guides us not only in proper preoperative treatment planning but also avoids the possible complications encountered while performing the minor oral surgical procedures involving maxillary posterior teeth, which are close to the maxillary sinus.

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