The mental foramen is situated in the anterolateral region of the jaw body. The artery, vein, and mental nerve, which is responsible for the innervation of the skin of the chin, vestibular gum, and lower lip, pass through this foramen. Normally, the mental foramen is located between the apexes of the roots of the lower premolars, but variations can be found in its shape and position. Thus, the anterolateral region must be studied to prevent accidents and complications, such as neurosensory disorders, which may occur during surgery.2–4 

Until recently, the area between the mental foramens was considered completely safe for implant placement and the removal of bone grafts. However, a detailed study of the anterior segment of the mandible demonstrates that, occasionally, an anatomical structure called the anterior loop of the mental nerve may exist in this region. The mental nerve loop originates from...

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