بررسی انواع شکستگیهای فک و صورت در موتورسیکلت سواران دارا و فاقد کلاه ایمنی مراجعه کننده به بیمارستان شهید رجایی شیراز.

Background and Aims: maxillofacial structures are usually affected in motorcycle crashes .So the aim of this study was to evaluate helmet using on the frequency and patterns of maxillofacial fractures. Materials and Methods: In this descriptive cross-sectional study,records of 181 patients hospitalized for maxillofacial fractures in Shiraz Shahid Rajae Hospital during 2016-2020were evaluated. Demographic and clinical variables included age, gender, type of fractures based on single or multiple and the location of the fractures in the mandible and the middle area of the face were recorded for each patient. The data were analyzed by chi-square test(P <0.05). Result: Out of 181 patients,%77.2 of patients were male and %22.8 were female. Significant difference between helmet using and gender and age groups were observed. P= 0.012 In motorcyclists with helmet in comparison to without helmet, fracture in middle face area was lower than mandible. Frequency of single and multiple fractures were %39.3 and %60.7 respectively. The highest frequency of middle face area and mandibular fractures were in lefort II and body of mandible respectively. The lowest frequency of middle face area and mandibular fractures were in nasal bone and ramus respectively .Against mandible, there was a significant relationship between helmet using and middle face area fractures. (P=0.011) Conclusion: helmet using can reduce maxillo facial fractures especially in middle face area. [ABSTRACT FROM AUTHOR]