Instruments

All of the following are characteristics of the periodontal file, except

• Used to crush or roughen heavy calculus deposits

• Is a supplemental instrument to the sickle and curets

• Rectangular, round or oblong base

• Has a rounded back and a rigid shank

• Is not area-specifi

Answer explanation

Each file is designed for use only on certain tooth surfaces: therefore, a set of files is needed to instrument the entire mouth.

Hirschfeld 9/10: F and L of anteriors

Hirschfeld 3/7: F and L of posteriors

Hirschfeld 5/11: M and D of posteriors

Orban 10/11: F and L of posteriors

Orban 12/13: M and D of posteriors

All of the following are the general characteristics of the Modified Langer Curets, EXCEPT?

• Longer lower shank to access pockets greater than 4mm

• Smaller working-end for deeper narrower pockets

• Only one Langer curet is required to instrument the entire mouth

• has a long complex functional shank

• Combination of design allows for instrument to be use on all surfaces of a tooth

Answer explanation

Each curet is limited to use only on certain teeth.

Several Langers are required the instrument the entire mouth. This is considered a hybrid style instrument that combines the features of a universal curet with the features typical of an area-specific.

Has parallel cutting edges, set at 90 degrees.

Used like a any other universal curet

Langer 5/6: Anterior

Langer 1/2: Mandibular posterior

Langer 3/4: Maxillary posterior

Langer 17/18: posterior

What are the characteristics of a After 5 Extended Shank curet?

• Lower shank is 3 mm longer than that of a standard Gracey

• Working end is the same length as a standard Gracey

• All three answers are correct

• Working end width is 10% thinner than that of a standard Gracey

An After 5 mini has a lower shank that is 3mm longer than that of a standard Gracey. The working end length is half the length of a standard Gracey but has a 5% thinner working end width.

• All statements are True

• All statements are False

• Statement one is True, statement two is false

• Statement one is False, statement two is true.

Answer explanation

The working end width of an After 5mm is 10% thinner than that of a standard Gracey.

An After 5 Micro-mini has a 20% thinner working end width than that of a standard Gracey

• True

• False

Miniature and micro-miniature instruments are designed for what purpose?

• Instrument midlines of anterior roots and line angles

• For use in narrow deep pockets over 4mm

• Instrument root branches and furcation areas

• Instrument line angles

• All answers are correct

The O'Hehir curets are a type of area-specific curet and have a continuous cutting edge.

• Both statements are True

• Both statements are False

• Statement one is True, statement two is False

• Statement one in False, statement two is True

Answer explanation

The working end is one continuous cutting edge.

Used with a push and pull stroke in any direction.

Good for periodontal pockets, furcations, and developmental grooves, since it has an extended lower shank.

Used to smooth root surfaces and remove small residual deposits after instrumentation with curets.

O'Hehir 1/2: F and L surfaces of posterior teeth

O'Hehir 3/4: M and D of posterior teeth

O'Hehir 5/6: Anterior teeth

O'Hehir 7/8: Anterior teeth with deep pockets

A diamond-coated instrument has no cutting edges and is designed similar to a Nabers probe. Used to remove small embedded remnants of calculus that remains on the root surface after instrumentation.

• All statements are True

• All statements are False

• Statement one is True, statement two is False

• Statement one is False, statement two is True

Answer explanation

Diamond instruments are finishing instruments for use after deposit removal with other instruments.

Not designed for heavy calculus removal.

Used with very light pressure and multidirectional strokes to achieve a clean smooth, even surface.

Ideal for Class II furcations