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Chapter 19, Dental Instuments, Burs
Terms in this set (19)
Are a part of a group of instumetns referred to as rotary instruments. Burs are used for cavity preparation, finishing and polishing restorations, surgical procedures, and dental appliance adjustments.
include discs and stones and are designed to be used with dental hadpieces
What their made of?
Burs are made up of steel of tungsten carbide materials. The steel burs are not used as often as the carbide, because the steel dulls quickly.
Groups of Burs
Include diamond, cutting, surgical, laboratory, and finishing
Parts of the Bur
The Shank, The Neck, and The Head
The shank of the bur is inserted into the handpiece. To accomodatre various dental handpieces there are three different styles of beu shanks
The Straight Shank
(Designated HP when ordereing) or the long shank, functions with the straight, low speed handpiece
The Latch Type Shank
(Designated RA) is shorter than the straight shank, on the latch type there is a notch that fits inot the contra angle/right angle handpiece and latches securely into place
The Friction Grip Shank
(Designated FG) is short, small, and smooth. These burs are used in friction grip, high speed handpieces
The neck of the bur is tapered in connection of the head to the shank
The head is the working end of the bur. There are many shapes and sizes of heads on dental burs. A variety of burs are needed to perform a variety of tasks in restoring teeth and specialty procedures.
Nine kinds of cutting burs : Round, Inverted Cone, Plain Fissure Straight, Plain fissure Cross Cut, Tapered Fissure Straight, Tapred Fissure Cross Cut, End Cutting, Wheel, and Pear
Cuuting Burs Identification
These burs are identified by number ranges, the numbers describe the size, shape, and variation of the bur. it is important to know the number ranges of the burs because the dentist will often ask for a bur by its number. Cutting burs have six to eight cutting blades or surfaces.
Used for rapid reduction of tooth structure during cavity preparation, polishing and finishing composite restorations, and occlusal adjustment. Diamond burs are also used for bone and gingival contouring during surgical procedures. Come in different shapes, sizes, and grits. Diamond particles are embeded in the bur through electroplating or bonding process. Specifically designed for finishing, trimming, and composite restorations
Smooth, trim, and finish metal or compostite materials. Finishing burs have up to 30 blades and come in a variety of shapes and sizes
Red Bands -- 8-12 blades on the bur
Yellow Bands -- 16-20 blades on a bur
White Bands -- 30 blades on bur, used for finishing
Used in a low speed handpiece to reduce and contour the alveolar bone and tooth structure, come in various sizes and shapes, and have long shanks
Used to adjust acrylic materials such as partials or dentures, and custom trays. They are used on plaster, stone, and metal materials. They have long shanks and large working ends. Sometimes refrerred to as Vulcanite or Acrylic Burs.
Extremely small, used to explore occlussal surface, while keeping tooth stucture in tact, these burs cut quickly while leaving a small minimally invasive groove in suspicious pits and fissures
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