pH changes in external root surface cavities after calcium hydroxide is placed at 1, 3 and 5 mm short of the radiographic apex.

The purpose of this study was to test the null hypothesis that there is no difference in the pH on the external apical dentin surface when the canal is completely filled with calcium hydroxide or when it is placed 3 or 5 mm short of the apical foramen in extracted human teeth. The root canals of single-rooted anterior human teeth were cleaned and shaped after decoronation. Cavities about 0.

The Air Force Dental Service--cross into the blue.

The Air Force Dental Service was founded shortly after World War II in order to provide oral health care to active duty, retired, and active reserve Air Force personnel, their families while overseas, and designated others. Grouped with medical facilities and organized by functional commands, the Air Force Dental Service enjoys a strong reputation in special operations, including education, forensics, expeditionary services (including combat and humanitarian efforts), the Dental Investigation Service, and the Air Force Inspection Agency.