Mandibular Fractures as Related to the Site of Trauma and the State of Dentition

¹ Department of Anatomy, The University of Michigan, Ann Arbor, Michigan

Statistical analysis of 319 case histories of mandibular fractures revealed certain significant associations. For analysis, the data were grouped according to the state of dentition, by the site of impact, by the location of the fractures, and by the number of fractures per case. There was a significant association between the dental state and the fracture location. With respect to dentulous jaws, the association and the state of trauma and the location of fractures was proved to be due to other than chance factors. Jaws with a few scattered teeth missing demonstrated that the trauma site and the location of fracture were not due to chance but could be predicted in their occurrence. The state of the dentition and the number of fractures were likewise orderly and not chance events. The trauma site and the number of fractures produced also were non-random. Associations between age of the individual by decade and the location of fractures and that between age and the number of fractures per case proved to be due to chance alone.