@article{oai:shinshu.repo.nii.ac.jp:00002142,
 author = {宮沢, 裕夫 and 鈴木, 秀人 and 大西, 敏雄 and 今西, 孝博 and 奥山, 秀樹 and 矢島, 幹人 and 林, 春二 and 赤坂, 守人},
 issue = {3},
 journal = {松本歯学},
 month = {Dec},
 note = {Actual state of trauma on the face and head was studied using 694 kindergarten and nursery school children ages ranging from 3 to 5 years in Saku, Nagano Prefecture, and the conclusion was as follows: 1. 46% The children experienced trauma on the face and head and 7% those included injury of trauma on the deciduous tooth. 2. Compared with past reports, root fracture caused by falling was noted at a high frequency, with injury while having something in mouth at 12.4%. It was highly noted that mucosa of maxilla was injured while a toy or a toothbrush was kept in mouth. 3. As for trauma of the tooth, crown fracture and root fracture including exposed pulp were noted at 48.9%, which was higher in frequency than that of dislocations at 35.8%. 4. Injuries frequently caused while keeping a toothbrush in the mouth were considered to be due to the health guidance given by the dental practicians to establish a custom of brushing teeth, telling parents, "let your child have a toothbrush as a toy"., application/pdf},
 pages = {250--258},
 title = {長野県佐久地方における小児の顔面,頭部,歯の外傷についての実態調査},
 volume = {18},
 year = {1992}
}