A case of 35-year-man with a rhabdomyosarcoma in the mandible has been presented. Chief complaints are dull sensation and growing mass at the area of the right mandible. In order to make diagnosis, roentgenograms were taken which revealed some sort of radiopaque and punched appearane at the area from right body to angle of the mandible, and biopsy was made, by which rhabdomyosarcoma was observed. The author treated this patient in terms of hemimandiblectomy, neck dissection and resin-made mandible implantation, and has observed this patient for two and half years after operation. The author satisfy that this patient has been recovered.

64 dental students who had brushed their teeth with scrubbing method, using 'W' dentifirice for a long lime, were made to practise either scrubbing or Bass method. using one of the 'W','X','Y','Z' toothpaste instead of only 'W' paste for recent 3 weeks. Dental plaque on the teeth of every students were carefully examined compared the results. The simplified oral hygiene index was applied for this purpose and following conclusions were achieved. 1) The Scrubbing method of tooth-paste 'X', Bass method of tooth-paste 'X', and the Bass method of tooth-paste 'Z' had an obvious effect to inhibition of accumulation of plaque. 2) In the tooth brushing method, the scrubbing and Bass are both effective in reducing the plaque accumulation 3) The tooth paste 'X' has the most effectiveness in reducing the plaque accumulation among four tooth pastes 4) The difference in the value of plaque index between the tooth pastes, 'W' and 'X' was only significant statisticallay