Incidence of retromolar canal in Egyptian population using CBCT: a retrospective study

Abstract

Background: Many studies have been done to investigate the incidence and the course of the retromolar canal (RMC) in different populations either osseous studies using cadavers or dry mandibles, panoramic studies, or cone beam computed tomography (CBCT) studies. The location of the RMC is in the retromolar area distal to the third mandibular molar. The retromolar area is considered an imperative site where many dental surgeries are being held. The aim of this study is to determine the incidence of RMC in the Egyptian population using CBCT and measure the distance between the RMF and neighboring anatomical landmarks to better allocate the RMC and RMF and avoid the complications. Two hundred and fourteen CBCT scans were examined to detect the presence of RMC. Their course was classified to 3 main types A, B, and C, and linear measurements were done from the retromolar foramen (RMF) to the 2nd and 3rd molars in anteroposterior direction and from the RMF to the mandibular foramen (MF) in anteroposterior and mediolateral directions. Results: The RMC was present in 24 scans from the 214 with 11.2% incidence rate. The most common type was found to be type A, and type C was the rarest. The RMC has no significant difference between males and females, unilateral and bilateral distribution, and right and left sides. The linear measurements from the RMF to the 2nd and 3rd molars are 14.70 ± 5.07 mm and 4.26 ± 4.21 mm, respectively, and from the RMF to the MF in anteroposterior and mediolateral directions are 15.69 ± 3.43 mm and 2.62 ± 1.60 mm, respectively. Conclusions: The incidence rate of RMC in Egyptian population represents 11.2%. The use of CBCT is quite important in the evaluation of the retromolar area to visualize the presence of the RMC or RMF and avoid the complications occurring due to different dental surgical procedures performed in the aforementioned site.

Retromolar canal: Frequency in a Polish population based on CBCT and clinical implications – a preliminary study

“…It also makes it possible to precisely locate and view the mental foramen. 29,30 The occurrence of RMC affects treatment. Knowledge about its prevalence, topography and structure facilitates treatment, especially during all the procedures requiring the use of anesthesia.…”

CBCT Based Evaluation of the Anatomical Variation of Retromolar Canal in A Sample of Egyptian Population. A Retrospective Study

“…Additionally, these measurements may help the physician to more accurately localise the the retromolar foramina during various clinical trials. 26 Where our investigation found the distance between the mandibular foramen and retromolar foramen in the anteroposterior and mediolateral direction to be 15.17± 2.39 mm and 3.04±0.53 mm respectively which were in accordance with the only previous study who investigated for, on the Egyptian population.26 However, the current study discovered that the retromolar foramen's distance from the wisdom tooth's distal surface was to be 9.34±1.36 mm which was not much of a change with the results of Badry et al, Park et al and Ogawa et al who discovered that the retromolar foramen and wisdom were separated by 4.26±4.21 mm, 5.8±3.6 mm and 5.5±2.1 mm, correspondingly.8,26,27 Moreover, the present study determined that the distance between the retromolar foramen and the second molar's distal surface is 16.96±2.12 mm which was analogous to the findings of Elbadry et al who determined the distance to be 14.7±5.07 mm, Han…”