The Effect of Mandibular Symphysis Fracture on the Position of the Permanent Incisor Tooth Germ

Background: Among facial bones in children, mandible bone has the highest fracture rate, 8.4% of which is related to Symphysis fractures. Case Presentation: A 3.5-year-old girl with complaints about the mobility of the mandibular left primary central incisor without a history of recent dental trauma and caries referred to the Department of Pediatric Dentistry of Hamadan University. After radiographic evaluation, occlusal displacement of lower left permanent central incisor tooth germ and root resorption of lower left primary central incisor were seen. Conclusions: This case report implies that because of the close proximity of the root of the primary tooth to its developing permanent successor, jaw fracture and especially mandibular fracture combined with dental injuries (e.g., intrusion, avulsion, and extrusive luxation) can cause damages and significant displacement in permanent successor tooth germs.