We clinically analyzed 51 pediatric patients with 52 odontomas who were treated at our department between 1978 and 1999. 37 cases (72.5%) were classified as compound odontoma, 13 cases (25.5%) were complex odontoma and one case (2.0%) was mixed with compound and complex types. The ratio of boys to girls was 2: 3. The average age on appearance of this lesion was 10.0 years, with the range of 4 to 15 years. Most cases had X-ray visual odontomas, but they have no symptoms. Most of compound and complex types were located in the incisor region in the upper jaw. As for the size of the lesion, compound type was 11.5mm and complex type was 10.6mm. About eighty percent of cases were accompanied with impacted teeth. All cases had no recurrence after operation.

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We performed clinico-statistical study of oral and maxillofacial injuries in infant patients. This report included 358 children who were less than 6 years old and visited the Department of Oral Surgery, Sapporo Medical University School of Medicine during 7 years between April 1993 and March 2000. The ratio of boys to girls was 1.4: 1. The most common cause of injury was a fall. Tongue injury was mostly found in the soft tissue injuries and the anterior maxillary region injury was in the hard tissue injuries. Most of the trauma of the milk teeth were dislocation (90.8%). And most of the dislocated milk teeth were preserved and only a few teeth were extracted (9.3%).
Questionnaire survey revealed that the prognoses of the preserved milk teeth were good.

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Clinicostatistical observations were performed on 661 pediatric patients under 15 years of age with oral and maxillofacial injuries at the Department of Dentistry, Oral and Maxillofacial Surgery, Jichi medical school hospital during the last 15 years (1st, January 1984 to 31st December 1998).
1. The ratio of male to female was 1.6: 1.
2. By age distribution, aged 1 group showed a higher incidence than other groups.
3. The common causes of oral and maxillofacial injuries were falls (51%), crash (15%) and play (12%).
4. Of 661 pediatric patients with injuries, 67 had mandibular fractures, 58 had alveolar bone fractures, 438 had soft tissue injuries, 345 had deciduous teeth injuries, 362 had permanent teeth injuries.
5. The most common site of soft tissue injuries was upper and lower lip.
6. On the site of mandibular fractures cases were mandibuler body only, 18 cases were condyle only, 9 cases were mandibular body and condyle.
7. Open reduction for mandibuler fractures was performed on 8 cases, and conservative treatment was performed on 59 cases.
8. The most common treatment for the alveolar bone fracture was intramaxillary fixation (51%).
9. Teeth fixation was performed on 358 teeth for the treatment of teeth injuries.

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Four-hundred and twenty-six cases of oral and maxillofacial injuries in pediatric patients under the age of 16 years were statistically analyzed. All of the patients were seen by the Department of Oral and Maxillofacial Surgery, National Defense Medical College over an 11-year period between 1989 and 1999. The following conclusions were made:
1. The number of injuries in pediatric patients remained about the same from year to year, averaging 38.7 cases per year.
2. The ratio of male to female patients was 1.5: 1.
3. When analyzed according to the age distribution, 1-year-olds showed the highest incidence of injuries, with most injuries (66.4%) occurring in patients under the age of 6 years.
4. The frequency of traumas was higher in May and November than in other months and lower in January and February.
5. The time of injury distribution showed peaks at 10: 00, 14: 00, and 18: 00.
6. Most of the consultations were direct visits, not referrals.
7. The most common cause of oral and maxillofacial injuries was a fall (72.8%).
8. Of the 426 pediatric cases that were analyzed, 8.0% suffered jaw fractures, 5.2% had alveolar bone fractures, 33.2% suffered teeth injuries and 53.6% had soft tissue injuries.
9. The most common sites of soft tissue injury were the tongue, the frenulum of the upper lip, and the upper lip.
10. The most common treatment for alveolar bone fractures was fixation, and the most common treatment for teeth injuries was observation.
11. The most common treatment for fractures of the jaw was intermaxillary fixation.

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We described a 10-year-old female with a mucoepidermoid carcinoma arising in the palate. She had orthodontic treatment, then the doctor discovered a swelling in the right side of the palate in August, 1996. So the doctor removed orthodontic brace, but the swelling was unchanged. Therefore she visited our clinic. At first the lesion was thought to be a benign tumor. Because of a 26×21mm hemispherium pattern, there was painless swelling of the palate. A biopsy was performed, the tissue was thought to be a malignant tumor. With the patient under general anaesthesia, tumorectomy was performed. Pathological diagnosis was a mucoepidermoid carcinoma (moderate type). Later, extraction of 76_??_ and additional ectomy including alveolar bone were done.

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The odontoma is an odontgenic tumor which is composed of dental hard tissue, that may obstruct eruption of permanent teeth due to disturbance. We experienced treatment of giant complex odontoma which appeared in infant mandibles. A 10-year-old girl was first seen in our hospital with a swelling of her left cheek. In the x-ray radiograph appearance which showed clear border and obstruction of eruption of permanent teeth was found. The diagnosis was a complex odontoma, and the tumor was removed surgically under general anesthesia. The progress of her operation was good, permanent teeth show normal eruption.

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This paper reports the rare case of the tip of a broken wooden chopstick remaining in the soft palate. A 3-year-old boy fell forward with a chopstick in his mouth during walking in the house. There was about a 10mm length wound in the rear part of the hard palate. CT examination and X-ray tomogram revealed foreign matter in the soft palate. Under general anesthesia the tip of the wooden chopstick in the soft palate was removed.

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