Aim: To find out the relationship of gingival biotype with schneiderian membrane thickness using cone beam computed tomography (CBCT) in patients at tertiary care dental hospital presenting for routine periodontal care. Methods: In this cross-sectional study, a total of 150 patients were observed in department of Periodontology, Fatima Memorial Hospital College of Medicine and Dentistry Lahore. Patients were clinically evaluated and gingival biotype wasrecorded. Afterthat cone beam computed tomography was performed to assess the patient’s schneiderian membrane thickness from mesial of maxillary 2nd premolar todistal of maxillary 2nd molar due to many anatomical variations of maxillarysinus. Results: In this study the mean age of the patients was 38.75±8.17 years, 70 (46.67%)patients were male. Thin biotype was found in 66(44%) patients and thickbiotype was found in 84 (56%) patients. In thin biotype the mean thickness of schneiderian membrane was 0.58±0.085mm while in thick biotype the mean of schneiderian membrane was1.25±0.07mm (p-value<0.05). Conclusion: The study concluded that there is significant relationship exist between the schneiderian membrane and thickness of biotype. positive correlation of gingival biotype with width of keratinizedgingivainmaxillaryanteriorteeth. Keywords: gingival biotype, schneiderian membrane, Cone Beam Computed Tomography (CBCT), missing teeth

Aim: To determine the greater palatine foramen position with reference to Maxillary molar teeth among patients presenting in a tertiary care hospital in Lahore by using cone beam computed (CBCT). Method: In this cross sectional studywhich was conducted at Fatima Memorial Hospital located in Lahore, in which a total of 80 patients were included. Informed consents and demographic details were noted. Cone beam computed tomography was taken in Planmeca Promax 3D Mid (60-120 kV; 9-33 s; 200 um voxel size) of all subjects. As per operational definitions, linear measurements for location of greater palatine foramen were measured. All the information was recorded in a specifically designed form. Results: Onaveragethe age ofpatients in this study was 39.35±11.19 years, 38(47.50%) patients were male. On left and right side the most common position was between middle and mesial face of third molar noted in 45(56.25%) and 43(53.75%) patients respectively. Conclusion: The most common position both sides was the position between middle and mesial face of third molar followed by position between distal face and middle of third molar in patients reporting in a tertiary care hospital located in Lahore by using cone beam computed tomography (CBCT) Keywords: Greater palatine foramen, cone beam, CT,