فهرست مطالب maede jafarian amiri

This study aimed to assess the prevalence and correlation of Concha Bullosa (CB) and Nasal Septal Deviation (NSD) with maxillary sinus Mucosal Thickening (MT) using Cone-Beam Computed Tomography (CBCT). This descriptive, cross-sectional study was conducted on CBCT scans of 228 females and 157 males (mean age of 44.82±15.10 years) retrieved from the archives of the Radiology Department of Shahid Beheshti Dental School. The images were evaluated by one oral and maxillofacial radiologist for presence/absence of NSD, CB, and maxillary sinus MT, and their correlations. Statistical analyses were performed by independent t-test, Chi-square test, and binomial test (alpha=0.05). The prevalence of CB, NSD, and MT was 61.6, 80, and 70.6%, respectively. NSD (p=0.131) and CB (p=0.211) had no significant correlation with MT. However, CB and NSD were significantly correlated (p=0.006). NSD had a significant correlation with contralateral presence of CB as well (p=0.000). The prevalence of CB was significantly higher in females (p<0.05), while the prevalence of NSD and MT was significantly higher in males (p<0.05). The present study revealed no significant correlation between CB and NSD with maxillary sinus MT. Thus, in absence of clinical symptoms, patients with CB or NSD should not be necessarily referred for treatment of sinus abnormalities. However, considering the significant correlation of CB and NSD, in case of presence of one entity, the other one should be suspected.

 Determining the exact location of mandibular foramen is an important factor prior to Inferior Alveolar Nerve (IAN) block injection. The aim of this study is to assess the position of Mandibular Foramen (MF) and its variations using Cone-Beam Computed Tomography (CBCT).

 This study was conducted on CBCT images of 80 females and 80 males (18 to 68 years). The distance between the MF and the anterior border of ramus (A), inferior border of mandible (B), superior border of mandible (C), and occlusal plane was measured. Data were analyzed by the student t-test, bivariate correlation analysis, paired sample t-test, and Pearson’s correlation coefficient. 

 The mean amount of A, B and C distances, and the mean distance from the occlusal plane to the center of MF were 13.76, 24.24, 12.32, and 7.59 mm, respectively, with no significant difference between the right and left sides (p>0.05). The mean B and C distances were significantly smaller in females than males (p<0.05). The mean size of the measured angle was 43.2°. Significant correlations were noted between aging and decreased A distance, and reduction in the angle between the contralateral premolars and MF (p<0.05). 

 Knowledge about the position of MF can enhance the surgical procedures in this region. Using a 21-25 mm needle would be associated with lower risk of needle fracture during IAN block injection. Also, needle insertion angle <45-degrees is optimal for the samples assessed in this study.