Instrument Sharpening

Sharp

A ______ cutting edge bites into the deposit, removing it efficiently

Dull

A ____ cutting edge slides over the deposit and might burnish it.

tiny, upward

A_____, ______, stroke is all that is needed to remove calculus with a sharp instrument

TRUE-

T/F: A dull cutting edge increases the chance of losing control

Reduce the number of strokes needed, reducing overall treatment time.

Sharp instruments:

Shorter appointments and using less pressure during instrumentation.

Patients prefer

Career longevity, reduced clinician fatigue

Using fewer light strokes means:

restore a fine sharp cutting edge

Goal of sharpening

15-40

Sharpening should be done after______ calculus removal strokes

Dull cutting edge

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

sharp cutting edge

a fine line formed where the face and lateral surfaces meet:

70-80 degrees

For sickles, curettes, graceys, the internal angle is______

does not reflect light

A sharp cutting edge has no thickness therefore

round, will

A dull cutting edge is_____ and _______ reflect light

heel third, middle third, toe third

The three imaginary planes for the cutting edge are:

be ineffective for calculus removal and can fracture more easily

Incorrectly sharpened instruments may________________________________

FALSE: they have limited use life and will need to be replaced

T/F: instruments have an indefinite use life

1. stop treatment, remain calm, 2. inform patient 3. maintain retraction pt position

Managing a broken working end: three steps

FASLE; this may lodge metal further into tooth, and impede the visual exam

T/F: The best way to remove a broken tip is with compressed air and a suction tip

Exam areas-folds and floor of mouth, blot with gauze if located, exam with curette, use curette to scoop out metal fragment

Steps to retrieve a broken end:

Take a PA of the area to locate it.

If a metal fragment cannot be located visually you should______

After each use or as needed.

How often should you sharpen sickles, curettes, graceys:

Sharpen sterile instruments

In order to decrease the risk of disease transmission one should_____________

TRUE: they need a lubricating oil that cannot be sterilized.

T/F: natural sharpening stones are not recommended during treatment

Ceramic stones

The best stones for chairside sharpening

sharpening stones, magnification, plastic test stick, gauze, stable surface, gloves, safety glasses

Tools for sharpening include______________________

Sharpening stone

Removes metal from the lateral surfaces of the cutting edge

Oil/Water stone lubricants

Prevents metal shavings from being imbedded in the stone, and reduces frictional heat

maintaining the original function and designs of the working end.

Essential goal of instrument sharpening:

A BULKY working end; cannot remove calculus

If the stone contacts the working end at an angle over 80 degrees, it creates_________

a thin, weak working end

If the stone contacts the working end less than 70 degrees, it will create________

Moving instrument technique

involves removing metal from the lateral surface by moving the working-end across the surface of a stabilized stone

Sharpening Horse

Holds the sharpening stone in a fixed position

Clinician can view the face-to-stone angulation

Facilitates use of the moving instrument technique

the moving instrument technique

sliding on the fulcrum while using the modified pen grasp is part of

parallel to the tabletop

When using a sharpening horse, the instrument face should be______

True

T/F: When sharpening aways begin at heal third

Turn the sharpening horse around

In order to sharpen both cutting edges of sickle and curette you should_________

Moving stone technique

involves removing metal from the working end by moving a sharpening stone over a lateral surface of a stabilized instrument

True

T/F: Researchers found that the Moving Instrument Technique produces the most precise cutting edge without wire edges or irregularities