軽症化する歯の酸蝕症とその管理

Japanese occupational safety and health laws require dental examinations for workers who have workplace exposure to strong acids and specific special chemicals. This study\u27s dental examinations have been performed over the past eight years. Data in the form of annual images were collected during exams at a modern chemical production facility which uses various concentrations of nitric, hydrochloric and sulfuric acids with area ventilation and worker environmental chemical protection for those substances. Images of the front teeth and tongue were obtained once a year to monitor and improve detection of subtle dynamic changes in tooth surfaces and oral mucosa. Dental information concerning acid workers has reported a marked decline in the incidence of moderate to severe dental erosion in the past few decades. An innovation in the exam methods led to several interesting findings. Dental erosion in a reduced form was identified in about half of the workers, which suggests that erosion is still occurring even at a modern production facility. Dental erosion was most likely to be identified in plant workers with historical and routine exposures to acid quantities in excess of 100Kg. of acid exposure. In some workers, a subtle progression of dental erosion, not previously diagnosed through the normal on site visual exams, has been identified through digital dental images taken chronologically

A case of lipomatous pleomorphic adenoma in the parotid gland: a case report

<p>Abstract</p> <p>Introduction</p> <p>Pleomorphic adenoma is the most common benign neoplasm of the salivary glands. Extensive lipomatous involvement of the tumor is, however, a very rare finding.</p> <p>Case report</p> <p>Herein, a rare case of lipomatous pleomorphic adenoma arising in the parotid gland of a 14-year-old Japanese woman is presented.</p> <p>Conclusion</p> <p>This is the sixth case of lipomatous pleomorphic adenoma in the English literature. Recognition of this rare subtype of pleomorphic adenoma is important for clinical diagnosis and management. On CT scan, it may not be detected possibly due to the extensive fatty component.</p

Lung adenocarcinoma with micropapillary component presenting with metastatic scrotum tumor and cancer-to-cancer metastasis: A case report

A 54-year-old man was admitted to the hospital presenting with a 3-month history of sclerosing dermal lesion in the external genitalia. A scrotal skin biopsy revealed a poorly-differentiated adenocarcinoma, immunohistochemically positive for cytokeratin 7 (CK7) and for thyroid transcription factor 1 (TTF-1), and negative for CK20. One month after admission, he died of respiratory failure. At autopsy, a consolidating lesion with vague margin was noted in the left lung as well as a well-circumscribed nodule in the right lobe of the thyroid. Histopathologically, pulmonary lesion was adenocarcinoma with a micropapillary component. On the other hand, thyroid tumor was diagnosed as a follicular variant of papillary carcinoma with foci of micropapillary adenocarcinoma. Positive immunohistochemistry for surfactant protein on micoropapillary component was useful to confirm that micropapillary component was of lung adenocarcinoma origin