Platelet Rich Plasma (PRP), which contains large amounts of various growth factors such as platelet-derived growth factor (PDGF) and transforming growth factor-β (TGF-β), has been recently used in several kinds of operations for the purpose of enhancing hard and soft tissue healing. In order to accelerate bone growth and maturation, we added PRP to the graft material at the times of bone grafting for cleft lip with or without cleft palate (CL/P) patients with alveolar cleft. In this present study, we performed a clinical observation of these patients who were followed; 11 patients were enrolled. 7 patients with unilateral cleft lip and palate (U-CLP), 2 patients with bilateral cleft lip and palate (B-CLP), 1 patient with unilateral cleft lip and alveolar bone (U-CLA), and 1 patient with oblique facial cleft (Tessier's classification No. 4, U-CLP). The range of the age at the time of the operation was from 5 years and 11 months to 11 years and 1 month (Hellman dental stage IIC-IIIB). We performed bone grafting in 3 alveolar clefts to guide incisor, in 7 to guide lateral incisor, in 2 to guide canine. For the preparation of autologous PRP, we used Smart PReP^TM (Harvest Technologies ^©), which resulted in about 220% concentration of platelets in our cases. The weight of iliac bone graft material per one alveolar cleft was 2.1g on average. In all patients, we resumed orthodontic treatment after 1 month from the operation. To evaluate grafted bone, X-ray examination was done after 1 month, 3 months, 6 months, 1 year from the operation. X-ray revealed sufficient bone bridge in the region at an early stage (3-6 months) in all cases. Wound healing of alveolar mucosa was also good in all cases. From these observations, we confirmed that PRP is very useful at times of bone grafting and beneficial for cleft lip with or without cleft palate patients.

抄録全体を表示

A clinico-statistical observation was performed for pediatric outpatients with oral and maxillofacial lesions who attended the emergency outpatient unit of our hospital over a five-year period.
One hundred and ninety-nine pediatric oral and maxillofacial emergency patients attended the unit in the five-year period from 1997 to 2001. There were 120 boys and 79 girls. 1997 saw the fewest with 26 patients and 2000 saw the most with 50 patients. The average number of patients was 39.8 during the five years and there was a tendency for the number to increase year by year. By age distribution, children 1 year of age showed the highest incidence with 46 patients. There were 109 pediatric patients during weekdays and 90 patients during the weekends and holidays. The most patients were seen on Sundays with 45, followed by Friday with 34 patients. By far the greatest majority of patients attended during the afternoon and evening, with approximately 63% of all patients being seen after 18: 00 hours. The most common presenting condition was injury such as soft tissue injury, injury of teeth, alveolar bone fracture and jawbone fracture accounting for about 90%. Inflammation, temporomandibular joint disease and others accounted for the remaining 10%. One hundred and sixty-five patients were referred from outside institutions or treating physicians of our institution, there were 20 patients brought to our hospital by the ambulance emergency services, and 13 patients visited our emergency outpatient unit directly.

抄録全体を表示

We have reported a case of congenital teeth in a female infant with a very low birth weight (1, 020g). She was referred to our clinic 6 days after her birth. The mass was 5mm×7mm in size and was found at the lower alveolar region corresponding to the site of the left deciduous incisor. We thought the mass might be a congenital epulis at the lower gingiva. However, the tooth erupted from the top of the mass 22 days after the first medical examination. We diagnosed this as a congenital tooth and then removed both the granulation mass and tooth surgically under local anesthesia and intra venous sedation. Nine months has passed since the operation, and re-growth of the mass at the lower gingiva has not been observed. A dental diagnositc X ray showed that the congetital tooth was left at the deciduous first incisor. This confirmed that it was not a supernumerary tooth.

抄録全体を表示

Mucocele of the gland of Blandin-Nühn is a mucous cyst that develops under the tip of tongue and that frequently occurs in young people. Surgical resection has conventionally been employed as a treatment method against this cyst but the recurrence rate after operation is comparatively high. Recently, the usefulness of topical injection of OK-432 was reported in the treatment of lymphangioma cysticum and ranula. In this regard, we observed the disappearance of cyst after topical injection of OK-432 into the mucocele of the gland of Blandin-Nühn of a 9-year-old girl. Since no problematic adverse reaction was noted, the method is considered as one of the very useful treatment methods.

抄録全体を表示

In the present paper, a case of temporomandibular joint ankylosis is reported of a 9 year-old child having gradual exerbation of difficult mouth opening as the chief complaint. At the first visit to our department, mouth opening range was only 1.6 cm wide between the interincisors, resulting in gradual impossible mouth opening. Computed tomography (CT) and other radiographs revealed that the left condylar head and mandibular fossa made us suppose an adhesive deformity in shape and elongalated muscular process.
A mobilization operation and coronoidectomy of the elongated process were made at the same time for tempomandibular ankylosis, to get an enough mouth opening at the age of 9 years and 3months. Everyday from the next day after the operation, the physicotherapy for the mouth opening was tried and continued using with the exerciser (HU-OS II). In one year after this operation, she could open the mouth by herself for the distance of 3.8cm length.

抄録全体を表示

We reported a case of a giant follicular cyst in the maxillary sinus treated by marsupialization.
The patient was an 8-year-old girl with painful swelling of right cheek. On radiographic examination, resorption of the right maxillary bone was noted and the right upper canine was located in the upper area of the right maxillary sinus. Marsupialization was performed under clinical diagnosis of follicuar dental cyst. 2 years after the operation, the cyst had disappeared and the canine, having been guided to the normal dental position, erupted.
We concluded that marsupialization is a useful method for treating cysts in children.

抄録全体を表示

Dentigerous cysts are the most common odontogenic cysts in children. However, incidences of bilateral dentigerous cysts are rare. We described a case of dentigerous cysts of the bilateral mandibular first premolar teeth in a 10-year-old boy. Marsupialization of the cysts was performed. There has been no recurrence one year after the surgical treatment.

抄録全体を表示

We reported a case of hemangioendothelioma that was found in the maxillary gingiva of a 5-year-old boy. He complained of repeated bleeding in the left maxillary gingiva.
Arterial embolization of the maxillary artery was performed in the preoperative therapy; then partial maxillectomy and buccal fat pad transplantation was performed. Microscopically, proliferation of endothelial cells were found in the several parts. (epithelioid type)
Although there is no recurrence and dysfunction of the maxilla 5 years after the operation, careful follow up is necessary.

抄録全体を表示

The benign cementoblastoma is classfied as a odontogenic tumor of derived from ectomesenchyme. This tumor is comparatively rare, compromising less than 1% of all odontogenic tumors. The tumor generally occurrs in association with the permanent dentition. Therefore, to our knowledge, there have been only eight cases reported in association with the deciduous teeth.
Recently, we experienced a case of benign cementoblastoma that occurred at the root of right lower second deciduous molar in a 7-year-old girl. Radiographic examination revealed a radiopaque rounded lesion with a well-defined radiolucent border. Under general anesthesia, the tumor was removed and treated with the packed-open method.
Histopathological findings of the removed specimen were characterized by the formation of cementum like hard tissue with the cementoblast like cells and cementoclast like cells scattered. The radiographic observation and histologic finding were consistent with a diagnosis of benign cementoblastoma. After 1 year of surgical treatment, the patient's course was going well and the recurrence was not recognized.

抄録全体を表示