title: [A retrospective study of 1420 oral and maxillofacial traumatic cases].
abstract: OBJECTIVE
  This clinical retrospective study is aimed to offer the clinical epidemiologic information about oral and maxillofacial trauma based on 1420 cases.
  
  
  METHODS
  From 2005-2006, 1420 oral and maxillofacial traumatic cases were treated in Ninth People's Hospital,Shanghai Jiao Tong University School of Medicine. Data regarding age, gender, cause of injury, pattern of fracture and associated systemic injuries were reviewed.
  
  
  RESULTS
  The male to female ratio of 1420 cases was 3.24:1;and 36.22% of patients were aged between 20 and 30 years.The most common cause of injury was road traffic accident (42.07%); the zygoma (41.83%) and mandible (29.50%) were the most frequent fracture sites; 43.6% of the cases were not treated or not treated properly in 3 weeks after trauma.
  
  
  CONCLUSIONS
  Road traffic accident is the most common cause of hospitalized traumatic cases, and the zygoma and mandible was the susceptible sites to be fractured.Because of the high proportion of inappropriately treated cases,we should take much attention to dentofacial deformities resulting from delayed or inappropriate treatment of oral and maxillofacial trauma cases.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Shanghai Jiao Tong University School of Medicine, Shanghai 200011,China. shijung@hotmail.com
authors.forename: Jun
authors.initials: J
authors.lastname: Shi
authors.forename: Wei-Liu
authors.initials: WL
authors.lastname: Qiu
authors.forename: Bing
authors.initials: B
authors.lastname: Xu
authors.forename: You-Sheng
authors.initials: YS
authors.lastname: Tang
mesh_terms: D000063:Accidents, Traffic; D000328:Adult; D002681:China / Q000453:epidemiology; D005260:Female; D050723:Fractures, Bone; D006801:Humans; D008297:Male; D008334:Mandible; D008446:Maxillofacial Injuries / Q000453:epidemiology*; D012189:Retrospective Studies; D012574:Schools; D055815:Young Adult