Evaluation of shape, size, and location of mental foramen in dentulous and edentulous among Saudi population using 3D cone-beam computed tomography.

Background

Mental foramen (MF) and its accessories are the important anatomical considerations while placing implants or doing surgical procedures in and around the mandibular premolar region. This study aimed to evaluate the shape, size, and location of mental foramen in dentulous and edentulous patients among the Saudi population using 3D cone-beam computed tomography (CBCT).

Methods

In this retrospective study, CBCT scans that were taken between 2015 and 2020 from Riyadh Elm University were retrieved. A total of 180 samples of CBCT (90 dentate and 90 edentulous) were taken. Prevalence of different horizontal positions of the mental foramen (P1 to P6) and other additive parameters like the distance from mental foramen to alveolar crest and inferior border of the mandible, along with the mental foramen angle was assessed. The difference in the mental foramen location among dentate and edentulous subjects was assessed. Gender and age variation also was assessed. All the data were statistically analyzed using SPSS.

Results

The predominant horizontal position is P4 followed by P3 (59 % in males and 63 % in females at P4, and 15 % each in males and females at P3 respectively). The horizontal position of the mental foramen and gender showed a statistical significance difference, especially at the P3B, P5, and P4 positions. Moreover, a statistically significant difference was seen in the mental foramen to the mandibular inferior border of the mandible (MF_MSB) and the width of mental formane in the transverse section (MFW). Comparison of the mental foramen among dentate and edentulous subjects showed a statistically significant difference. There was a change in the mental foramen with age.

Conclusion

Based on the methodology and sample of this study, it can be concluded that the edentulism only reduced the dimension of the mental foramen opening.