Four hundred and seven cases of salivary gland tumors, obtained from Ishikawa Prefectural Central Hospital and Kanazawa University Hospital were studied. They were composed of 277 cases of benign tumors and 130 malignant tumors. Histologically they consisted of 224 pleomorphic adenomas, 40 monomorphic adenomas, 35 mucoepidermoid tumors, 8 acinic cell tumors, 40 adenoid cystic carcinomas, 17 adenocarcinomas, 8 epidermoid carcinomas, 6 undifferentiated carcinomas, 9 malignant pleomorphic adenomas (carcinoma in pleomorphic adenoma), 8 hemangiomas, 6 malignant lymphomas and others. The frequency of the malignant tumors of the minor salivary glands was higher than that of the major salivary glands. Eleven tumors (2.7%) were noticed under age of 15. Histopathologically they were composed of 6 hemangiomas, 2 pleomorphic adenomas, one neurilemmona, one rabdomyosarcoma and one adenocarcinoma. The frequency of hemangioma in children was higher than that in adult. And the frequency of malignant tumors in children (18%) was lower than that in adult (32.3%). Ten tumors in children occurred in parotid and other one tumor occurred in submandibular gland. No tumor occurred in minor salivary gland.

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Clinicostatistical observations were performed on 172 cases of oral and maxillofacial injuries in children under 16 years of age at the Second Department of Oral and Maxillofacial Surgery, faculty of dentistry Osaka University during the 5 years from 1986 to 1990. The following conclusions were drawn.
1. The number of children with injuries each year was almost no change from 1986 to 1990.
2. The incidence of traumas in children was 27% of all patients with injuries. Of 172 cases of children with injuries, 35 (20%) suffered jaw body fractures, 25 (15%) had alveolar bone fractures, 70 (41%) suffered teeth injuries and 42 (24%) had soft tissue injuries.
3. The frequency of traumas was higher in May than in the other months and lower in February. There were higher on Friday and/or Sunday than in the other days and lower on Tuesday.
4. The ratio of male to female was 1.7: 1.
5. By age distribution, under 4 and/or 13-16 age group showed a high incidence.
6. The common causes of oral and maxillofacial injuries were falls (51%), traffic accidents (26%) and sports (7%).
7. The ratio of mandibular fracture to midface fracture was 6.6: 1. The common sites of mandibular fractures were condyle (41.5%), symphysis (24.5%) and angle (15.1%).
The most common site of alveolar bone fractures was the symphysis in the upper jaw and that of the teeth injuries was the anterior teeth in the upper jaw.
8. Open reduction for jaw body fractures was performed on 13 cases (36%). The bone fixation was performed using interosseous wiring and/or mini plate.
The most common treatment for the alveolar bone fracture was teeth fixation (54.2%) and that for the teeth injuries was also teeth fixation (50%).

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Follicular dental cyst is not uncommon among odontogenic cyst, but bilateral follicular dental cyst is considered to be rare.
The authors experienced a case of bilateral follicular dental cyst of 5_??_5, on which a report was made here with literature consideration thereof.
The patient, a 12-year-old, noticed a swelling of the right mandibular body, was pointed out cystlike radiolucent areas containing the impacted 5_??_5 on a dental caries treatment. She then visited our department. On rentgenographic examination, radiolucent areas were noted with a comparatively clear border containing the crown of these 5_??_5, therefor the lesions were diagnosed follicular dental cyst. Under general anesthesia, complete extirpation of the cyst by extraction 5_??_ and treatment of Partsch I method to _??_5 were done. Histopathologically, the extirpated cyst walls of 5_??_5 were covered by stratified squamous epithelium overlying. a connective tissue_ and were diagnosed as dentigerous cyst.

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In extremely immature infants of school age, we performed dental examination, and made on analysis of the form of dental arch, skull and dento-facial comprex.
1) The ratio of ‘df’ patients in the group was not differ from the domestic 7 year-old group, but the mean ‘df’ teeth per a child was significantly few and the ratio of filled teeth in df teeth was much. So we suspected that the parents' concern about oral hygiene was comparatively high.
2) It was found that the both, upper and lower, dental arch was the U-shaped arch, because there were large in length, and narrow in width at the posterior part.
3) In the lateral view of roentgen cephalogram, the growth of the dento-facial complex was almost standard based on angular analysis using the craniometric points. From linear analysis, the length of anterior cranial base and the upper face height were nearly standard. But in the group of boys, the inferior face height and the length of the mandbular ramus were small. In the other group, the antero-inferior and postero-inferior face height were both small. On these grounds, poor growth of the mandibular portion was suspected in both groups.
4) In the postero-anterior view of roentgen cephalogram, the maximun width of cranial bone and the width in the upper and middle facial part were significantly small from those of the control group.

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We studied hemostatic management of oral bleeding in childhood patients with hemophilia or von Willebrand disease's treated in Department of Oral and Maxillofacial Surgery, Nara Medical University Hospital, during the past seven years from October 1981 to October 1988.
1) Sufficient topical treatments and prevention of infection are important to prevent after bleeding.
2) DDAVP was useful for patients of hemophilia A moderate type and von Willebrand's disease Type IIA to stop hemorrhage.
3) Good hemostatic efficiency can be expected for gingival bleeding and hard palate bleeding by one infusion of antihemophilic factor concentrates. Though movable soft tissue's bleeding tends to necessitate additional infusions.
4) Hemostatic treatment for patients of hemophilia or similar diseases, such as selection of drug, amountnt, method, topical treatment must be determined by the level of deficient factor, topical condition, operative degree, presence or absence of inhibitor.

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We have observed the clinical statistics of 12 year old pediatric patients and less, who came to the emergency clinic of the Oral and Maxillofacial Surgery section of Tokyo Women's Medical College Hospital between January 1987 and December 1990.
1) The ratio of pediatric patients to all emergency patients was 21.1% and there was no definite deviation by year.
2) 17.8% of the patients were age 1 and 63.5% of those patients were less than age 6.
3) The ratio of boys to girls was 1 to 0.68.
4) From a residential point of view, the majority of patients were from Shinjuku-Ward. 91.5% patients were from within a 10km radious of Tokyo Women's Medical College Hospital.
5) 67.7% of the patients experienced trauma and 24.3% experienced dental disease.
6) Regarding the cause of trauma, almost half of them were due to tumbling. In regard to the trauma itself, 63.3% was soft tissue injury, and remaining 36.7% was hard tissue injury. The most significant trauma was upper labial frenulum and it was centared around the oral vestibule.
7) The most treatment was suture, and there ware 10 cases that needed general anesthesia.

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