scalers FPI ch. 24 (DH14)-
week 7 with complete
verified solutions 2025
Sickle Scalers
•supragingival calculus removal
•Can be used for subgingival calculus removal
•tissue allowing
•Shank allowing
•Experience level
strokes on scalers
•Use short, controlled strokes as the calculus breaks up,
then lighter pressure to prevent root damage
•We do not use horizontal strokes for the distal line angles with sickle
scalers.
*By “we” I mean OCDH. Some clinicians may choose to use sickles for
distal line angles. We are not doing the horizontal strokes after. We will do
that with another instruments! it can Gouch the cementum.
sickle scaler anatomy
•Pointed back, two lateral surfaces and two cutting edges and a face that
join to form a pointed tip
•Face of sickle blade can be straight or curved
•Sickle shank comes in various design:
•Straight
•Contra-angle
•Curved
,advantage of the sickle scaler
The advantage of the sickle scaler is its ability to reach between
very tight contacts.
The sickle scaler is useful subgingivally only in situations where the
gingival tissue is not tight around the tooth or
when moderate to heavy subgingival calculus is present.
anterior sickles
•Single ended straight shank
•Double ended, paired design when the shank is slightly bent
•Blade, shank, and handle are in same plane
•Two cutting edges on a straight blade that end in a point or *two cutting
edges on a curved blade that end in a sharp point
•Cross-sectional view is triangular
anterior sickles: H6/7
hook shaped sickle with offset angled shank allows for adaptation of
all anterior areas and premolar areas.
**Use: anterior and premolar supragingival and subgingival (1-2mm)
calculus removal
Considerations: Not recommended for subgingival calculus removal >3mm
Anterior sickles: NEVI 1
, ·shank in line with handle and disc at one end used for stain or removal
of heavy ledges with a pull stroke.
·Thinner than the H6/7 and shorter, more curved blade.
**Note: You can also order a Nevi-1 with longer blade.
Considerations: Not recommended for subgingival calculus removal >3mm
wrong angulation
•Positioning the lower shank parallel to the tooth surface creates an
incorrect face-to-tooth angulation of 90 degrees.
Correct Angulation
•Correct angulation is achieved by tilting the lower shank toward the
tooth surface.
•This creates a face-to-tooth surface angulation of 70 to 80 degrees.
**Note: *Darby 80 – 90 degrees. It really depends on the instrument and
the surface. You will be anywhere from 70 – 90 degrees.
correct working end for anterior teeth
Sequence:
Sextant 2: Scale surfaces toward (to the patient's right), facial then à
lingual from 9:00. Then do surfaces away (to the patient's left), facial and
lingual, from 12:00.
week 7 with complete
verified solutions 2025
Sickle Scalers
•supragingival calculus removal
•Can be used for subgingival calculus removal
•tissue allowing
•Shank allowing
•Experience level
strokes on scalers
•Use short, controlled strokes as the calculus breaks up,
then lighter pressure to prevent root damage
•We do not use horizontal strokes for the distal line angles with sickle
scalers.
*By “we” I mean OCDH. Some clinicians may choose to use sickles for
distal line angles. We are not doing the horizontal strokes after. We will do
that with another instruments! it can Gouch the cementum.
sickle scaler anatomy
•Pointed back, two lateral surfaces and two cutting edges and a face that
join to form a pointed tip
•Face of sickle blade can be straight or curved
•Sickle shank comes in various design:
•Straight
•Contra-angle
•Curved
,advantage of the sickle scaler
The advantage of the sickle scaler is its ability to reach between
very tight contacts.
The sickle scaler is useful subgingivally only in situations where the
gingival tissue is not tight around the tooth or
when moderate to heavy subgingival calculus is present.
anterior sickles
•Single ended straight shank
•Double ended, paired design when the shank is slightly bent
•Blade, shank, and handle are in same plane
•Two cutting edges on a straight blade that end in a point or *two cutting
edges on a curved blade that end in a sharp point
•Cross-sectional view is triangular
anterior sickles: H6/7
hook shaped sickle with offset angled shank allows for adaptation of
all anterior areas and premolar areas.
**Use: anterior and premolar supragingival and subgingival (1-2mm)
calculus removal
Considerations: Not recommended for subgingival calculus removal >3mm
Anterior sickles: NEVI 1
, ·shank in line with handle and disc at one end used for stain or removal
of heavy ledges with a pull stroke.
·Thinner than the H6/7 and shorter, more curved blade.
**Note: You can also order a Nevi-1 with longer blade.
Considerations: Not recommended for subgingival calculus removal >3mm
wrong angulation
•Positioning the lower shank parallel to the tooth surface creates an
incorrect face-to-tooth angulation of 90 degrees.
Correct Angulation
•Correct angulation is achieved by tilting the lower shank toward the
tooth surface.
•This creates a face-to-tooth surface angulation of 70 to 80 degrees.
**Note: *Darby 80 – 90 degrees. It really depends on the instrument and
the surface. You will be anywhere from 70 – 90 degrees.
correct working end for anterior teeth
Sequence:
Sextant 2: Scale surfaces toward (to the patient's right), facial then à
lingual from 9:00. Then do surfaces away (to the patient's left), facial and
lingual, from 12:00.
