DHE150 Instrument Sharpening Quiz 2

restore blade sharpness

—Preserve original contours

—sharp cutting edge bites into the deposit/dull edge slides

—Patient comfort (less stroke pressure)

—Decreased operator fatigue (tiny upward strokes vs. pressing with greater force against a deposit)

—Decreased operator frustration

—Decreased burnished calc / tissue trauma (TT) / working time

—Increase in quality of procedure / safety / clac removal / control / operator efficiency

fine line formed where the face and lateral surface meet

results when metal is worn away from the cutting edge until the face and lateral surface meet at a rounded surface

Is a line

It has length

But, no width

• 1. universal curet or gracey
• 2. Universal
• 3.sickle anterior
• 4.sickle posterior

• the junction of the instrument face and the lateral surface.
• 
• 1/3 toe is the last part

curette

sickle

Cutting Edge: Area-Specific Curet

—Between 70 and 80 degrees

• Dull
• 

• Sharp
• 

sections

• Heel-third
• Middle-third
• Toe-third
• 

• —Decrease tactile sense
• No grabbing tooth structure
• Must angle curet to a more ‘closed’ position to get grip

• —Drag and rotate the first 2 to 3 mm along the sharpening stone
• 

• D&W recommend:
• blade moved at 110 angulation from the lower third of the blade to the midline of the toe
• Universal curet blade is offset at 90 degrees to the shank
• Each side is sharpened as needed

• —D&W recommend:
• angulation of 100 to 110 degrees
• Gracey curet blade is offset at 60 to 70 degrees to the shank
• Gracey curet are tilted away from the stone and not perpendicular to the floor
• 

• sharpening flat surfaces such as the hoe or sickle scaler.
• How to: moving the working-end across the surface of a stabilized stone
• Use modified pen graspSlide on Fulcrum as You Sharpen

• sharpening curets
• How to: —moving a sharpening stone over a lateral surface of a stabilized instrument
• Use a palm grasp / Stabilize hand  / Stabilize instrument
• Angulation between instrument face and sharpening stone should be between 70 and 80 degrees