Electric micromotor dental units are available alone, as slow speed handpieces for polishing and drilling, or combined with an ultrasonic scaler.
How It Works
The dental portable unit can polish or cut. The handpiece is driven by an electric motor in the handle. The polishing cup, or bur, can variably rotate from 0 to 30,000 rpm and go forward or reverse. It provides a very high torque. A diamond wheel is extremely hard and may last 2 to 5 years depending on use. When choosing a dental model trimmer, be sure to choose a vendor that stands behind their product. This will be a well-used piece of equipment and buying it from a vendor offering a 5 or 10-year warranty can provide substantial piece of mind. The handpiece can take a prophy angle, with polishing cups, or a contra-angle, with various attachments, including RA burs and polishing cups. Only a few units have a water-cooling facility.
Long HP burs can also be used in the nose cone (when the prophy angle is removed). They are used principally for trimming small herbivore cheek teeth.
Advantages
Relatively inexpensive, compared with an air driven unit.
Generally small, compact and mobile.
High-speed Hand Piece
The high-speed hand piece is capable of up to 400,000 rpm. It takes friction grip burs (FG) and has a water cooling facility for the bur. The water flow supplied to the hand piece can be varied or switched off completely.Features include a swing-open front housing for ease of cleaning and wheel changing, internal gutter to facilitate water runoff, full wheel radius water spray for efficient wheel cleaning, drain trough which completely surrounds the model tray to prevent water leakage, large 1" [2.5cm] diameter water exhaust, motor cover with removable top plastic utility tray. Lower torque feature for those who perform fewer model trimming operations. Shipped complete, ready for use with minor set-up. Finished with a durable, baked coating.
The micro motor handpiece provides low torque, which causes the bur to stall if pressed too hard onto the tooth (over 1-2 ounces of pressure).
The requirements laid down in national and international standards and draft standards provide helpful guidelines for optimum illumination. General room illumination with 500 lx and illumination of the working area with 1000 lx are best achieved with a larger number of fluorescent lamps on the ceiling above and in front of the dental chair. Daylight white lamps with good color rendering are a good combination with changing daylight and the color of light of the operating light. The color of external skin, mucous membrane and teeth appears natural. The eight surgical lights examined differ in quality.
It is used for the drilling of access points into teeth, for high speed sectioning of teeth during extraction and cutting or re-modelling of bone.
Source from：
No comments:
Post a Comment