An implantation of radon seeds into the bony structures of the oral cavity is not always desirable. The limited amount of soft tissue in the alveolar ridge and the hard palate makes the interstitial use of radium very difficult and at times impossible. In these locations a surface application of radium is indicated.
The great problem in oral applications is to get an applicator that will stay put. The movements of the tongue and muscles of deglutition will soon sweep ordinary applicators, such as forceps or pinch-cocks, from their anchorage. We experienced a great deal of difficulty in this regard until we commenced to use dental impressions made from a nonmetallic gum wax base. With them, we have been able to give treatments lasting over a period of hours without a great deal of discomfort to the patient.
The accompanying illustrations will serve to explain our appliance.