An ameloblastic fibroma (AF) is a benign mixed odontogenic tumor that mainly affects patients in the first and second decades of life. It is usually associated with an impacted tooth, commonly the first or second permanent molar. We present a case of an 11-year-old male patient diagnosed with AF, showing well-defined borders almost completely affecting the body and inferior alveolar nerve (IAN) branch on the right side of the mandible and displacing teeth 46 and 47 associated with the lesion. The treatment included conservative surgery, with oral rehabilitation, including IAN lateralization, implant placement without sensorial alteration, and posterior rehabilitation, performed after 10 years of follow-up. Rehabilitation with implants is a safe and effective procedure for the prosthetic rehabilitation of the posterior atrophic mandible. However, sensorial alteration of the IAN occurs in 100% of cases and tends to regress with time or may be permanent in few cases.