Rotatable ultrasonic dental tool

An ultrasonic dental tool comprising:

• a dental handpiece having a substantially cylindrical shape with a substantially hollow interior;
• and
• an insert partially disposed inside the handpiece, said insert comprising:
• a first transducer for generating ultrasonic vibrations;
• a connecting body having a proximal end and a distal end having a tip thereon, said proximal end attached to a first transducer so as to receive said ultrasonic vibrations therefrom and to transmit said ultrasonic vibrations toward the tip at said distal end;
• an O-ring disposed on said connecting body, said O-ring having an outer peripheral and an inner peripheral;
• and
• a groove having a contact surface of low coefficient of friction in contact with the inner peripheral of the O-ring to facilitate rotation of the insert inside the handpiece;
• wherein the outer peripheral of said O-ring seals the insert inside the handpiece.

An ultrasonic dental tool comprising:

• a dental handpiece having a substantially cylindrical shape with a substantially hollow interior;
• and
• an insert partially disposed inside the handpiece, said insert comprising:
• a connecting body having a proximal end and a distal end, the proximal end being attached to the first transducer so as to receive the ultrasonic vibrations therefrom and to transmit the ultrasonic vibrations toward a tip at the distal end;
• an O-ring having an outer peripheral and an inner peripheral, disposed on the connecting body at its inner peripheral;
• a second transducer for generating a voltage signal in response to movement of a portion of the connecting body according to the ultrasonic vibrations, said second transducer comprises a one-piece cylindrical structure for sliding onto said connecting body;
• at least one light source substantially proximate to the tip and receiving the voltage signal from the second transducer to generate light;
• and
• at least one magnetic material in close proximity to the connecting body and the light source;
• wherein said connecting body comprises a groove having a contact surface of low coefficient of friction for seating the O-ring to facilitate rotation of the insert about the O-ring.