Abstract
To discover a difference in the traumatic dental injuries of children in China and Japan, we investigated injured patients who visited the Department of Pediatric Dentistry, Osaka Dental University (ODU) involving 43 patients and 89 teeth and the Department of Pediatric Dentistry, the Stomatological College of the Fourth Military Medical University at Xian, China (FMMU), involving 68 patients and 101 teeth. The study was conducted from November,2003 to August,2004.
1) As for age distribution, the peak ages were 1-2 years of age and 8-9 years of age for both. There were numerous patients in the 1-2 year old, lower age group at ODU, while there were numerous patients in 8-10 year old group at FMMU. The sex ratio was 1.87: 1 at ODU, and 1.92: 1 at FMMU, with the boys being in the majority.
2) The traumatic dental injury occurred at indoors for patients at ODU and at outdoors for patients at FMMU.
3) The most common cause of trauma for the patients on the both countries was falling.
4) There was most Sunday and there were few Monday and carrier wound days of the week in the ODU on Saturday. Tuesday of the FMMU was the most and there were little Monday and it on Wednesday.
5) At the both hospitals the ratio of patients who went for examination within one week of the injury exceeded 70%.
6) The anterior teeth in maxilla were most frequently affected by trauma in both the primary teeth and permanent dentitions.
7) At both hospitals, the most common classification of trauma was Class C 3 for the primary dentition but at FMMU Class A 2 was seen in comparatively more cases. For the permanent dentition, at ODU Class 5 was the most common while at FMMU Class 1 was the most common.
