JVD 2019 3 The Air Driven Dental Unit: Form & Function at a Mechanical Level Pegg Rawlinson Flashcards
Which components of the dental machine are described in this article?
Compressor, Rheostat, Air water syringe, low speed hand-piece, high speed hand-piece
What alternatives are there for air supply to dental machines?
Small air compressor on machine Remote air compressor fed by line into machine Remote nitrogen tanks fed by line to machine
What is the rheostat?
The foot pedal
What part of the air water syringe should be autoclaved after each use?
The metal tip is removable and should be cleaned and autoclaved after each use.
What are the components of the low speed hand-piece?
The low speed micromotor, the hand-piece attachment: either a straight nose attachment or a contra-angle attachment.
What is the most common type of motor in a slow speed hand-piece.
A rotary vane motor.
What do the coloured rings on a slow speed hand-piece mean?
Blue or no colour 1;1 Green 4:1 reduction which means that the handpiece is rotating at 1/4 the rate that of the generation of the machine Red 1:5 increasing which means the handpiece will rotate 5 times faster than the machine is generating
What speed should a slow speed handpiece run at?
20, 000 - 40, 000 RPM
What speed should a high speed handpiece run at ?
350, 000 - 400, 000 RPM
Name 1,2, 3 & 4 in A in this picture
- Driver Air
- Exhaust Air
- Water
- Chip Air
What is chip air and what does it do?
Chip Air is the addition l air fed into the handpiece through a smaller hole at the base of the high speed handpiece. It atomizes the water at the head of the handpiece cooling the bur as it spins as well as washing away debris from cutting bone and tooth.
