How does dental drill works?

Well, there is a motor inside that pumps out high- pressure air to a gear. thus, the gear moves at around 40,000 rpm!!! Imagine how much air-pressure is acting upon the gear!!! Then when the gear moves , the drill bit also moves. the fast rotations let the dentist clean the teeth.

Hope this helps!!

Answer #2- The ideas are in the right direction, but the details are wrong. The turbine in a high speed drill is driven by high pressure water. The water is cooled to provide a slight anesthetic effect.

The drill bits are usually tungsten carbide.

The dentist will still use the older belt-driven drill on occasions when he wishes to provide a good bedding in the excavation for the cement and amalgam to adhere.

Hope this satisfies your question!

Number 1 you are on the correct track, number 2 you are WAY OFF BASE!!!

I am a 19yr veteran repair guy and have been trained by ALL of the HP manuf. around the world. First there are 2 types of drills... high speed and slow speed. Answer #1 was referring to the slow speed type. Air runs through a valve body and pushes a series of carbon blades/vanes to drive the assy. These air "motors" rotate approximately 20,000 rpm. Some have transmission type assy's built into them to reduce the speed if required. A high speed drill runs between 300,000 and 550,000 rpm. These are NOT driven by water. They have a miniature air driven turbine assy in the head/top of the drill and are driven by directing air at the impeller/blade assy on the turbine. Water is used externally only to cool the surface being drilled upon. Water never is run through the drive/turbine assy. Also, the so called drill bits(actually called burs) are not all carbide. All have a stainless shank and come with a variety of tips to accommodate different procedures.