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Original ArticleOpen Access
The Epidemiology of Mandibular Fractures Treated at Chiang Mai University Hospital: A Review of 198 Cases
Sirimaharaj W 
,
Pyungtanasup K
,
Pyungtanasup K Background: Mandibular fractures constitute a substantial proportion of maxillo-facial trauma cases in
Chiang Mai. The present study investigated the prevalence, sex, age group, alcohol consumption, crash
helmet use, causes, site, treatment, and postoperative result of mandibular fractures at Chiang Mai University
Hospital, Thailand.
Material and Method: The medical records and radiographs of 198 patients treated for mandibular fracture
at Chiang Mai University Hospital over a 1.5 year period (from 1 January 2005 to 30 June 2006) were
reviewed. Data on the patients’ age, sex, alcohol and helmet use, mechanism of injury, site of fracture, treatment
modality, and post-operative result were recorded and assessed.
Results: Men of 21 to 30 years of age sustained the most mandibular fractures. The ratio of males to females
was 5:1. Most fractures were caused by motorcycle accidents (MCA) (75.75%), followed by body assault
(13.63%), and falls (4.54%). Alcohol consumption was a contributing factor at the time of injury in 79% of
fractures according to the information available. The most common fracture sites were, in descending order,
the parasymphysis (45.3%), angle (19.51%), condyle (15.68%), symphysis (13.24%), body (3.83%), and
ramus (2.09%). Nearly 3/4 of all cases were treated by open reduction (76%).
Conclusion: The incidence and causes of mandibular fracture reflect trauma patterns within the community
and can provide a guide to the design of programs geared toward prevention and treatment.
Keywords: Mandibular fractures epidemiology, Mandibular fractures
Chiang Mai. The present study investigated the prevalence, sex, age group, alcohol consumption, crash
helmet use, causes, site, treatment, and postoperative result of mandibular fractures at Chiang Mai University
Hospital, Thailand.
Material and Method: The medical records and radiographs of 198 patients treated for mandibular fracture
at Chiang Mai University Hospital over a 1.5 year period (from 1 January 2005 to 30 June 2006) were
reviewed. Data on the patients’ age, sex, alcohol and helmet use, mechanism of injury, site of fracture, treatment
modality, and post-operative result were recorded and assessed.
Results: Men of 21 to 30 years of age sustained the most mandibular fractures. The ratio of males to females
was 5:1. Most fractures were caused by motorcycle accidents (MCA) (75.75%), followed by body assault
(13.63%), and falls (4.54%). Alcohol consumption was a contributing factor at the time of injury in 79% of
fractures according to the information available. The most common fracture sites were, in descending order,
the parasymphysis (45.3%), angle (19.51%), condyle (15.68%), symphysis (13.24%), body (3.83%), and
ramus (2.09%). Nearly 3/4 of all cases were treated by open reduction (76%).
Conclusion: The incidence and causes of mandibular fracture reflect trauma patterns within the community
and can provide a guide to the design of programs geared toward prevention and treatment.
Keywords: Mandibular fractures epidemiology, Mandibular fractures
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