The present study was to investigate the distribution of typical periodontpathic bacteria (Porphyromonas gingivalis, Prevotella intermedia and Actinobacillus actinomycetemcomitans) in tooth, tongue and buccal mucosa plaques in 3 to 17 Year old children. Clinical parameters (Rates of df, d, DMF, and D; plaque and gingival index) for each subject were determined prior to the collection of each site plaque. Three periodontopathic bacteria on each site samples were detected using IBA. The frequency of three bacteria for tooth plaque was higher than that for tongue or buccal mucosa plaque. The frequency of Porphyromonas gingivalis and Prevotella intermedia in supragingival plaques was significantly higher than that of corresponding ones in tongue or buccal mucosa plaques. The three bacteria also occurred more frequently in subjects aged between 10 and 14 years. Periodontopathic bacteria may be enhanced in circumpubertal children.

Epithelial-myoepithelial carcinoma (EMC) is a rare tumor constituting less than 1 % of all salivary gland tumors. This neoplasm most often involves the parotid glands, with less frequent involvement of the submandibular or minor salivary glands. This case report describes EMC arising from a minor salivary gland in the buccal mucosa. A 71-year-old Japanese man with a painless submucosal mass in the left buccal region was referred to our hospital. The patient stated that the tumor had been present for more than 4 years and was painless but increasing in size. Oral examination showed a mobile, well-defined mass of approximately 19 9 15 mm; its surface was covered mostly by normal mucosa. Magnetic resonance imaging showed a mass with well-defined borders and relative homogeneity internally. Incisional biopsy led to a histological diagnosis of a suspected pleomorphic adenoma or low-grade malignant tumor originating from the salivary gland. The patient underwent surgical excision under general anesthesia to obtain a definitive diagnosis, and EMC was diagnosed based on histopathological and immunohistochemical examination of the whole specimen. Because the surgical margins were positive in some areas, the patient underwent external postoperative radiotherapy (total of 60 Gy at 2 Gy/day). Recovery was uneventful, and good function returned after postoperative treatment. Four years after tumor resection and radiotherapy, no recurrence had been detected and no other lesions had developed.

No abstract

Objective: This report aims to elucidate the degree of degradation of bioabsorbable poly-L-lactide acid (PLLA) devices and the influence of these materials on the surrounding tissues in the human body. Methods: Two patients with fractured mandibles underwent treatment using a biodegradable fixation system. In the first case, the plates and screws were removed along with extraction of an impacted wisdom tooth at 6 months after surgery, and in the second case, the same procedure was performed 12 months after surgery. Changes in the physical properties of the materials and histologic alterations in the periosteum and bone associated with the bioabsorbable plates were assessed. Results: The materials demonstrated adequate degradation in the human body, and skeletal stability proved sufficient for the duration of mandibular bone healing without complications after surgery. Conclusion: On the basis these findings, it can be concluded that PLLA implants are useful for the fixation of human mandibular fractures.