Introducing 

Prezi AI.

Your new presentation assistant.

Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.

Loading…
Transcript

HANDPIECES and BURS

Cojocari Nicoleta

HANDPIECES

Cavities are cut with burs fitted in a handpiece. Conventional handpieces run at slow speedy - up to 4,000 revolutions a minute. A contra-angle handpiece is used most often as it provides access to every tooth. For easily accessible teeth, and trimming dentures, a straight handpiece is used.

Air turbine handpieces run at very high speeds - up to 400,000 revolutions a minute.They are contraangled and are used with a built-in water spray to counteract the heat generated by high-speed cutting. The advantages of air turbine handpieces are the ease and speed of cutting, and absence of vibration. Disadvantages are the difficulties caused by water spray, and the high. pitched whistling noise.

BURS

BURS

Burs used in conventional low speed handpieces are made of steel. For air turbine handpieces they are made of tungsten carbide or dia mond. Straight handpiece burs have a long plain shank. Burs for con ventional contraangle handpieces are short and have a notch in the shank which fits by a latch grip. Short burs are also used for the air turbine handpieces but they have a plain shank which gives a friction grip.

Contra-angled conventional handpieces with smaller heads, and using even shorter burs, are used on children. They are called miniature handpieces and burs. The cutting ends of burs are made in many different shapes but those most commonly used are as follows:

1. Rounds-used for gaining access to cavities and removing caries.

2. Cone - used for undercutting cavities.

3. Fissure - used for extending cavity to remove stagnation areas.

Learn more about creating dynamic, engaging presentations with Prezi