Abstract: A dental prophy angle handpiece used for teeth cleaning with its components made of plastic so as to be disposable after use including a front casing which comprises: foldable two sections to make a receptacle when folded, each one of the sections including a front cell, a shaft support and a cone portion formed in succession; a rotary member with a driven pinion at the middle and a metal ball at one end and installed in the front cells of the front casing; a drive shaft with a drive pinion that engages with the driven pinion of the rotary member and installed in the shaft supports of the front casing; a front cover covering the front casing to combine the front casing, the rotary member and the drive shaft into a single unit; and a cleaning cap attached to the rotary member. When the rotary member is rotated by the drive shaft that is connected to the rotary member via the pinion, the cleaning cap is rotated so as to clean the teeth.

Abstract: A dental handpiece comprises a handle section and a detachable head section. The head section to which a burr is mounted is made entirely of plastic except for ball bearings so that vibrations are absorbed via its own elasticity. The head section is disposed after use, thus avoiding the secondary infections of, for example, AIDS and hepatitis. A burr exchanging device for the handpiece is also disclosed.

Abstract: A dental handpiece comprises a handle section and a detachable head section. The head section to which a burr is mounted is made entirely of plastic except for ball bearings so that vibrations are absorbed via its own elasticity. The head section is disposed after use, thus avoiding the secondary infections of, for example, AIDS and hepatitis.