| 摘要 |
The dental descaling device comprises essentially a hollow sleeve and, arrranged inside, a piezoelectric transducer (4) which vibrates and supports a scraper (2) of which the end comes out of the sleeve, and an amplifier (8) connected to the transducer. The transducer is comprised of the base (20), of a series of piezoelectric pads (22a...22f) on the faces of which are arranged electrodes (23a...23g) connected so as to define an input (25, 24) and an output (26, 24), and of a head (21) to which the scraper is coupled. The amplifier comprises an input (32, 46), an output (39, 46) and two supply terminals (37, 44) receiving, by means of a cable connected to an outer voltage source, a low direct voltage (U). The output and the input of the transducer are connected respectively to the input and the output of the amplifier in order to form an oscillator of which the frequency is determined by the resonance frequency of the transducer coupled to the scraper. |
