Materials- Handpieces and Burs

Parts of a dental bur (3)

Head: Contains the cutting blades or the bur

Neck: Connects head and shank

Shank: Is inserted into the handpiece

Burs can be made from various materials, such as

Steel, Carbide, Diamond, Ceramic

Diamond bur grit sizes: The finer the grit, the _ number in microns.

lower

*diamond burs cause a larger smear layer than carbide burs

Carbide bur grit sizes: The finer the grit, the _ number of blades.

higher

(less blades = more coarse)

Intraoral carbide and diamond burs come in two different shank types

friction grips (FG) and right angle latch (RA)

High-speed handpiece

1:5, Friction grip burs, 1.6 mm shank, 500-200,000 rpm, torque 0.7 Ncm

• 1:5 (red band) speed-increasing handpiece, it multiplies the motor’s speed by 5

• ex: 30,000 rpm x 5 = 150,000 rpm MAX

Slow-speed handpiece

1:1, Right-angle latch burs, 2.35 mm shank, 60-40,000 rpm, torque 3.5 Ncm

Friction grip (FG/FGSS) burs

Used in high-speed handpieces, 1.6 mm shank diameter, Gear ratio: 1:5

Right-angle latch (RA) burs

Used in slow-speed handpieces, 2.35 mm shank diameter. Gear ratio: 1:1

1) Minimally Invasive burs (3)

Bur 889M 007, Bur 1/2 006, Bur 1 008

Bur 889M 007

Tapered micro flame diamond. Minimally invasive prep, open pits/fissures. high speed

diameter: 0.7

cut: 2.5

Bur 1/2 006

Round carbide 0.6 mm. Minimally invasive caries excavation, slow speed.

Bur 1 008

Round carbide 0.8 mm. Caries excavation, removal of liners and composites near dentin. slow speed

2. Caries Removal (4)

Bur 2 010, Bur 4 014, Bur 6 018, Bur 8 023

Bur 2 010

– Round carbide 1.0 mm. Caries excavation, removal of tooth-colored restorations. slow speed

Bur 4 014

– Round carbide 1.4 mm. Caries excavation, removal of restorations adjacent to dentin. slow speed

Bur 6 018

– Round carbide 1.8 mm. Caries excavation, removal of tooth-colored restorations. slow speed

Bur 8 023

– Round carbide 2.3 mm. Caries excavation, removal of tooth-colored restorations. slow speed

3. Mandrel (1)

Snap-on RA mandrel. Holds Sof-Lex disks. Finishing 15,000 rpm, polishing 4,000 rpm. slow speed

4. Direct Restorations (6)

Bur 329 006, Bur 330 008, Bur 245 008, Bur 801 010, Bur 801 014 / 018

Bur 329 006

– Pear carbide 0.6 mm. High-speed cavity preparation in enamel. high speed

diameter: 0.6

cut: 1.2 mm

Bur 330 008

– Pear carbide 0.8 mm. Cavity prep, removal of defective amalgam restorations. high speed

diameter: 0.8

cut: 1.6

Bur 245 008

Pear carbide 0.8 mm, 2.8 mm length. Interproximal box prep, defective amalgam removal. high speed

diameter: 0.8

cut: 2.8

Bur 801 010

– Round diamond 1.0 mm. Cavity prep, veneer grooves, composite removal. Not for amalgam.

Bur 801 014 / 018 (2 dif sizes but same function)

– Round diamond 1.4/1.8 mm. Cavity prep, veneer grooves, composite removal. Not for amalgam.

5. Finishing (5)

Bur 7901 009, Bur 8888 012, Bur 132EF 006, Bur 8274 016, Bur 379F 023

Bur 7901 009

– Flame carbide 0.9 mm, 12 blades. Finishing cervical margins of composites, contouring. high speed

diameter: 0.9

cut: 3.6

Bur 8888 012

Flame diamond 1.2 mm, fine (red) . Composite finishing/contouring occlusal, facial, buccal. high speed

diameter: 1.2

cut: 9.0 mm

Bur 132EF 008

– Needle diamond 0.8 mm, extra fine (yellow) . Finishing/contouring composites (all surfaces). high speed

• diameter 0.8

• cut: 3 mm

Bur 8274 016

– Flame diamond 1.6 mm, fine (red). Composite finishing occlusal, facial, lingual, buccal, high speed (best for finishing occulsal)

diameter: 1.6

cut: 3.5

Bur 379F 023

Football diamond 2.3 mm, fine (red). Occlusal adjustment, crown concavity finishing, ceramics.

diameter: 2.3

cut: 4.2

6. Indirect Bonded Restorations (Polishers- 5)

FLDC5M Blue, DC1M Blue, FLDC5 Gray, DC1 Gray, D209001 Brush

FLDC5M Blue

– Diacomp wheel polisher, medium grit. Composite polishing, 4,000–8,000 rpm. slow speed

DC1M Blue

Diacomp point polisher, medium grit. Composite polishing with water, 4,000–8,000 rpm. slow speed

FLDC5 Gray

Diacomp wheel polisher, fine grit. Composite polishing, 2,000–4,000 rpm. slow speed

DC1 Gray

– Diacomp point polisher, fine grit. Composite polishing with water, 2,000–4,000 rpm. slow speed

D209001 Brush

– Brush cup, fine grit. Composite polishing, 4,000–8,000 rpm.

Class I preparation measuring instruments (lecture 14)

• PLG1T: 2.3; 1.7 mm

• PLG2T: 1.0mm; 1.3 mm

• PLG3T: 2.0 mm; 1.6 mm

• Perio probe: 1.0 markings; 3.0 markings

• Hoe CP4008: 1.0mm; 0.65 mm

• Hatchet CP6419: 1.3 mm both ends

• Chisel CP6420: 1.3 mm both ends

• PLG2T, hatchet and chisel all measure 1.3mm

Three-number formula (used for chisels, hatchets, etc.)

• First number: Width of the blade (in tenths of a millimeter)

• Second number: Length of the blade (in millimeters)

• Third number: Angle of the blade to the handle (in centigrades or centigrade degrees)

Four-number formula (used for instruments with an angled cutting edge)

• First number: Width of the blade (in tenths of a millimeter)

• Second number: Angle of the cutting edge to the long axis of the handle

• Third number: Length of the blade

• Fourth number: Angle of the blade to the handle

Diamond coating oscillating instruments are faced

TOWARDS working tooth