Compass | All-ceramic restorations
Recommendations - Products and their use in the dental practice
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3-7
Ceramic inlays and partial crowns
8-9
Sonic tips
Expert Kit 4562ST
for interproximal cavity preparation
10 - 16
Ceramic crowns
17 - 20
Work on high-performance ceramics
Expert Kit 4573ST
1
2
Developed in close cooperation with renowned clinical
experts and dental practitioners, the Expert Kit 4562ST
simplifies and systematizes
the precise shaping of cavity
preparations for ceramic inlays
and partial crowns.
The kit contains three newly
developed instruments that
incorporate depth markers
(indicated by the letter “D” for
“depth” in the reference numbers). These marks indicate
the required minimal occlusal
thickness for successful
ceramic restorations. The kit
also includes other instruments necessary for inlay and
partial-crown preparations.
845KRD.FG.025
Premature loss of a ceramic
restoration often is a result
of insufficient cavity depth or
lack of attention to proper
layer thickness. The following
recommendations enable
the dentist to safely prepare
the cavity for a subsequent
ceramic restoration and to
avoid common errors.
959KRD.FG.018
All-ceramic restorations have
long been recognized for their
outstanding clinical qualities.
The esthetically desirable
results attained with these
metal-free, all-ceramic restorations have prompted more and
more patients to specifically
request them. To achieve a
successful all-ceramic restoration, however, all necessary
clinical parameters must be
considered during the preparation stages (“think ceramic”).
6847KRD.FG.016
Expert Kit 4562ST
0,5 mm
4 mm
2 mm
0,5 mm
Ceramic inlays and partial crowns
3
1
2
3
4
5
6
7
8
9
10
11
12
Use of the instruments (shown on a model)
1. Open the cavity with the
coarse-grit, rounded-edge,
tapered diamond instrument
(6847KRD.FG.016).
The instrument’s depth marks
at 2 and 4 mm help guarantee
the required minimal thickness
of the ceramic beneath the
fissure.
2. The same instrument is
used to create a proximal box.
The proximal enamel wall
remains intact for the time
being. If necessary, the adjacent tooth can be protected
with a steel matrix band.
4
3. Use the thin, flame-shaped,
fine-grit instrument
(8862.FG.012) to remove the
proximal enamel. In this step,
the enamel wall is removed.
Avoid creating a spring edge.
4. To smooth the inner walls
and the floor of the preparation, employ the finishing
instrument (8847KR.FG.016)
whose shape corresponds to
that indicated for step 1.
5. Depending on the size of
the cavity, two shorter,
rounded-edge, tapered instruments can be used to shape
the cavity as necessary:
959KRD.FG.018 (see
photograph above) and
845KRD.FG.025. Both instruments incorporate depth
marks—at 2 and 4 mm
(959KRD) and at 2 mm
(845KRD).
Handy hint:
We recommend our sonic tips
(see page 8) for shaping the
interproximal cavity margin.
6. For subsequent finishing,
two fine-grit instruments with
matching shapes are offered:
8959KR.FG.018 (see
photograph above) and
8845KR.FG.025. Each instrument features a red ring. The
tapered instrument should be
tilted in the oro-vestibular
direction to increase the opening angle in the occlusal direction.
7. Use the thicker flame-shaped
finisher (8862.FG.016) to give
the edges of the box a concave
shape. The instrument should
be pulled from an apical to an
occlusal direction.
The convex tip of the instrument
automatically creates a concave
contour in the tooth structure.
Enlarge the opening angle in the
occlusal direction, taking care
to create an open (rather than
excessively steep) preparation
and, again, avoid creating a
spring edge. The transition
between the cavity floor and
the box must be rounded.
8. If necessary, the cavity
beneath the fissure can be further deepened with the ballshaped, normal-grit instrument
(801.FG.023).
9. Use the tapered instrument
(959KRD.FG.018) to horizontally
shorten the cusps. Hold the
instrument in a horizontal
position. Its 1.8 mm diameter
(1.4 mm at the tip) ensures
sufficient reduction. The
845KRD.FG.025, with its larger
2.5 mm diameter (1.9 mm at
the tip), is ideal for creating
smooth margins. This instrument also can be used to form
rounded shoulders inside the
preparation, if required.
10. Round off all inner edges
with the fine-grit, egg-shaped
instrument (8379.FG.023).
11. The egg-shaped instrument
also can be employed to slightly
round all horizontal outer edges.
Round off all edges within the
preparation to avoid leaving any
sharp transitions.
12. Using the thin, flameshaped finisher (8862.FG.012;
see figure 3 above), round off
any remaining corners and
edges in hard-to-reach areas as
well as any sharp transitions at
the contour of the preparation
margin. Make sure to avoid
creating a spring edge.
5
1
2
3
≥ 1,5 mm
4
≥ 2,5 mm
5
6°–10°
6
90°
90°
Illustrations of the most important guidelines to be observed during preparation
1. Round off the transitions
between the floor and walls of
the cavity as well as all angles
within the cavity.
2. Check the contour of the
preparation from the occlusal
to exclude any sharp edges.
The inlays are ground from the
outside to exactly match the
shape of the cavity. The bur
used to grind the inlay is unable to recreate such sharp
edges, which would lead to
undesirable gaps between the
inlay and the cavity wall.
6
3. When creating the fissure,
make certain that a minimal
occlusal depth of 1.5 mm is
observed, even beneath the
cavity fissure. The cavity floor
can be deepened with a round
bur.
5. Work in a diverging rather
than parallel manner. The recommended opening angle of
the cavity walls is 6°–10°. The
adhesive used will eliminate
the need for other types of
retention.
4. To avoid fracture of the
inlay, ensure that a width of
at least 2 mm is observed
even at its narrowest point
(isthmus).
6. The surface angle at the
transition between the cavity
and the tooth surface should
be approximately 90°, giving
increased stability to the
ceramic and the tooth substance. Protect the neighboring tooth with a steel matrix.
Use the flame-shaped instrument to give the proximal
edges a slightly concave
shape. The flame-shaped
instrument should always be
used on the sides of the box,
never on the box floor. Oscillating instruments are also suitable for shaping the walls of
the box (see page 8).
Contents of Kit 4562ST
6847KRD.FG.016
8847KR.FG.016
959KRD.FG.018
8959KR.FG.018
845KRD.FG.025
8845KR.FG.025
8862.FG.012
8862.FG.016
801.FG.023
8379.FG.023
Kit 4562ST
in a stainless steel
bur block suitable
for sterilization
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4°
Sonic tips
10°
For interproximal cavity preparation
2,45 mm
3,00 mm
Komet has developed innovative sonic tips for the preparation of interproximal cavities.
The new sonic tips are
designed for the final shaping
of cavities and for smoothing
interproximal cavity margins.
The diamond-coated working
parts (mesial and distal) of the
four new sonic tips are bisected
lengthwise. Their distinctive
design makes them especially
suitable for work on molars
and premolars (two sizes are
available). To prevent damage
to the adjacent tooth, the tips
are coated only on one side.
Thanks to their rounded angles
in the transition area between
the axial and shoulder regions,
these sonic tips can prepare
cavities in a perfectly chamfered shape, thus providing the
best conditions to take a precise impression of the preparation. Impressions can be produced with either conventional
impression material or by
means of advanced radio-
graphic techniques, making
the new tips ideal for both
conventional and CAD/CAM
restorations. In addition, the
clear, concise shape of the
preparation facilitates subsequent construction of precise
restorations in the laboratory
or with in-practice CAD/CAM
capabilities.
7,30 mm
3,40 mm
3,95 mm
7,30 mm
Prior to using the sonic tips, basic preparation is carried
out with rotary instruments.
The interproximal cavity margin is shaped and smoothed
with a vestibular/oral motion.
The sonic tip is guided along
the cavity margin in a mesiodistal direction to remove any
unstable enamel structures.
Recommended power levels
in the Komet sonic handpiece
SF1LM:
Power level 1: Finishing
Power level 2: Power level 3: Shaping
The tips also can be used in
the following handpieces:
• The KaVo SONICflex®
handpiece (series
2000N/L/X/LX or series
2003N/L/X/LX)
• The W&H scalers (Series
Synea® ZA-55/L/LM/M or
series Alegra® ST ZE-55RM/
BC
• The Sirona SIROAIR L
For premolars:
SFM7.000.1 - mesial
SFD7.000.1 - distal
For molars:
SFM7.000.2 - mesial
SFD7.000.2 - distal
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9
1
Ceramic crowns
2°
2
3
4
5
6
R 0.8
Expert Kit 4573ST
All-ceramic lateral crown*
Available in different sizes and
grit types, the key instrument
in the crown-preparation kit
features a tapered round configuration (6856.FG.021). It is
perfectly adapted for preparing
a distinct chamfer with
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rounded interior angles. Sinking the instrument up to half of
its diameter into the tooth
creates a distinct chamfer with
a 0.8 mm radius, which
assures sufficient substance
removal and rounded interior
angles. Both of these characteristics are among the primary requirements for a successful ceramic preparation:
The large radius prevents a lip
preparation, and the large
diameter (021) yields smooth
surfaces without grooves or
scratches, particularly during
finishing. The optimal amount
of substance removal to
assure sufficient material
thickness ranges between 1.0
and 1.5 mm; therefore, the kit
includes instruments in two
diameter sizes: 021 for larger
teeth and 018 for smaller
teeth. The instrument features
a 2° cone angle, which allows
the creation of a 4° total angle
in case of a circular preparation, without the need to
swivel the instrument.
1. Use instrument
6837KR.FG.012 to prepare a
1-mm uniform shoulder
approximately 0.5 – 1 mm
above the future preparation
limit.
6856.FG.021
Based upon the success of
Expert Kit 4562ST for ceramic
inlays and partial crowns,
Komet Kit 4573ST focuses on
crown preparations with special attention directed toward
the specific requirements of
all-ceramic crowns.
2. With instrument
6856.FG.012, create an interdental separation and prepare
a thin, proximal, temporary
enamel wall. Protect the adjacent tooth with a steel matrix
if necessary.
3. Following interdental separation, use diamond instrument 6837KR.FG.012 (as in
step 1 above) for initial shoulder preparation. Parallel substance removal is carried out
by holding the instrument in a
vertical position.
4. The occlusal view clearly
demonstrates the 1-mm circumferential shoulder that
corresponds to the anatomical
contour of the root.
5. Use instrument
6836KR.FG.014 to reduce the
occlusal surface. To easily
achieve a minimum 1.4 mm
substance removal, introduce
the instrument completely
into the occlusal surface. An
occlusal substance removal of
up to 2 mm is possible.
6. With the occlusal reduction,
make certain to prepare simplified replicas of the anatomic
cusps. Apply instrument
6836KR.FG.014 (as in step
5 above) to the molars and
premolars from four different
directions to create cusp
replicas.
* Note: The use of the crown-preparation instruments is demonstrated on a model. It is possible to change the order of the illustrated preparation steps according to personal preferences.
11
7
8
9
10
11
12
1
2
3
4
5
6
All-ceramic anterior crown*
7. To protect the gingiva, place
a retraction cord following
completion of the initial preparation.
8. For final shaping of the
preparation limit to achieve a
chamfer with a 0.8 mm radius,
employ the larger instrument
(6856.FG.021) for easy access
to oral and vestibular areas.
When using this instrument,
take care to avoid damage to
adjacent teeth.
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9. If the adjacent teeth
require no preparation, first
use the thinner instrument
(6856.FG.018) to create the
chamfer in the interdental
areas.
10. Define the final preparation limit with the finishing
instruments of matching
shape, i.e., 8856.FG.018
and 8856.FG.021.
11. If sufficient interdental
space is present, the finishing
instruments described in step
10 (above) may be employed.
Again, avoid damaging adjacent teeth.
12. Check the completed preparation for sufficient interocclusal clearance. With allceramic restorations, all sharp
edges and corners must be
rounded off. Komet flexible
polishing discs are especially
suitable for this purpose.
1. Use the thin instrument
(6856.FG.012) to obtain the
interdental separation.
2. Use instrument
6837KR.FG.012 to prepare a
1 mm sized uniform shoulder
approximately 0.5 –1 mm
above the future preparation
limit.
3. The occlusal view clearly
shows the 1 mm circumferential shoulder following the root
contour.
4. Using instrument
6837KR.FG.012 (see step 2),
reduce the labial surface of the
sagittal curve of the crown by
1 mm.
5. Reduce the incisal
aspect with instrument
6836KR.FG.014, a short cylinder with rounded edges and a
green ring. When the instrument is completely introduced,
a minimal substance removal
of 1.4 mm can be easily
accomplished. An occlusal
substance removal of up to
2 mm is possible.
6. With the egg-shaped instrument (6379.FG.023), reduce
the palatal aspect by at least
1 mm. To protect the gingiva,
placement of retraction cord is
recommended following the
initial preparation.
* Note: The use of the crown-preparation instruments is demonstrated on a model. It is possible to change the order of the illustrated preparation steps according to personal preferences.
13
7
8
9
10
11
12
1
4°– 6°
2
1,5–2,0
3
1,0 – 2,0 mm
1,5–2,0
1,5
1,0
1,0 mm
4
5
1,5–2,0
1,5
1,0
Illustrations of important guidelines to observe during preparation
7. For final shaping of the
preparation limit to achieve a
chamfer with a radius of 0.8
mm, use the larger instrument
(6856.FG.021) to simplify
access to oral and vestibular
areas. When using this instrument, make certain to avoid
damage to adjacent teeth.
14
8. If adjacent teeth require no
preparation, create the chamfer in the interdental areas
with the thinner instrument
(6856.FG.018) first.
9. Define the final preparation
limit with finishing instruments
of matching shape, i.e., 8856.
FG.018 and 8856.FG.021.
10. With the egg-shaped, finegrit instrument (8379.FG.023
finish the palatal surfaces.
11. Using a silicone index,
ascertain that sufficient substance has been removed.
12. To complete the preparation for an all-ceramic restoration, round off all sharp edges
and corners. Komet flexible
polishing discs are particularly
suitable for this purpose.
1. Create a stump with a 4 – 6°
cone. Round off all transitions
within the preparation to prevent potentially damaging tension beneath the restorative
material.
restoration, take care to eliminate all sharp edges and corners.
2. If the position of the tooth
requires no correction, the
outer contour of the crown
should be reduced by 1.5 mm,
the occlusal surface by 1.5 –
2 mm, and the margin by at
least 1 mm without mimicking
the crown equator. To ensure
an ideal fit of the subsequent
4. Both a shoulder preparation
with rounded interior angles
and a distinct chamfer preparation can be created. Rework
the preparation margin using
finishing instruments of matching shape (red ring).
3. The preparation limit must
have a width of at least 1 mm.
5. Avoid tangential, springedge, or lip preparations. They
are contraindicated with allceramic restorations. Exercise
special care when using instruments with a round tip, and do
not introduce them more than
up to half their diameter at
maximum. Please note that
tangential preparations are
technically unfeasible and
would result in too thin (i.e.,
unstable and over-contoured)
crown margins.
15
Work on high-performance ceramics
Contents of Kit 4573ST
6837KR.FG.012
6836KR.FG.014
6856.FG.021
8856.FG.018
6856.FG.018
8856.FG.021
6856.FG.012
6379.FG.023
16
Kit 4573ST
in a stainless steel
bur block suitable for
sterilization
Grinding abutments, trepanation, or fitting restorations
made of high-performance
ceramic materials are common
challenges for the dentist.
After conducting a series of
tests, Komet now offers a
special ZR-Diamond™, which
has been developed specifically to meet the challenges
of high-strength ceramics. The
ZR-Diamond are constructed
with a special bond that durably secures the diamond
grains, thus maximizing operating life and optimizing material
reduction when compared to
traditional diamond instruments.
ZR-Diamond are offered with
different grain sizes to meet
specific indications. Trepanation of all-ceramic restorations
is ideally carried out with
coarse-grain, more aggressive
instruments. When fitting the
high-strength ceramic restora-
tion, less-aggressive, mediumgrain or fine-grain instruments
are recommended.
ZR-Diamond are perfectly constructed for precision-work on
high-strength ceramics and are
sure to become an invaluable
instrument for every dental
practice.
8379.FG.023
17
Recommendations for use
With the special round abrasive ZR6801.FG.010/014,
quick trepanation is achieved.
Handy hint:
To remove ZrO2 restorations,
we recommend our crown cutter (4ZR.FG.012/014) specifically engineered for work on
zirconium dioxide.
Efficiency of the
ZR-Diamonds
• We recommend using the
instruments in the red contra-angle because the higher
torque allows more efficient
work on ZrO2 (compared to
the torque of a conventional
turbine).
ZR-Diamond
Standard diamond
instrument
18
• Optimal speed:
(160,000 rpm
Material reduction
Using the instrument
ZR862.FG.016, slight adaptation of a ZrO2 crown can be
readily accomplished.
• Use maximum spray coolant,
especially during trepanation
procedures (min. 50 ml/min.).
• Apply low contact
pressure (<2N).
Time
19
Kit LD0707
LD/ZR Cut,
Finish & Polish
ProductInformation
ZrO2 | ZR-Diamonds
™
g
attractive smiles,
As they strive for healthy,
seek cosmore and more dental patients
for their restormetically pleasing options
place toothative care. Today's dentists
with evercolored, esthetic restorations
on the current
increasing frequency, relying
ceramics.
generation of high-strength
of strength,
Offering an ideal combination
esthetics,
durability, and outstanding
a very reliable
Zirconium oxide (ZrO2) is
It is, howhigh-strength ceramic material.
to manage and
ever, exceptionally difficult
instrucut using conventional diamond
and performents. Unmatched in versatility
address
mance, Komet ZR-Diamonds™
ZR-Diathese real, everyday challenges.
grind ceramic
monds™ can be used to
to create
abutments, for trepanation
and to
access for root-canal treatment,
of high-strength
simplify the precise fitting
and
operatory
the
In
ceramic restorations.
provide
in the laboratory, ZR-Diamonds™
minimal
with
and
quickly
superior results
features diamond
effort. The unique design
in a dense,
bonded
permanently
particles
a line of vastly
packed layer. The result is
modern
address
that
diamonds
superior
ering a considceramic demands while off
Kit 4622
ZR Flash Polishers
Scientific advice - Expert Kits
Private Lecturer Dr. M. Oliver Ahlers
CMD-Centrum Hamburg-Eppendorf
and
University Hospital Hamburg-Eppendorf
Center for oral and maxillofacial surgery
Polyclinic for conservative and preventive dentistry
www.dr-ahlers.de
for managing zirconia restorations
Substance removal in
Specialized rotary instruments
ZR-Diamonds™
Standard diamond instrument
Substance removal in
Time in seconds
relation to time
and materialerably longer operating life
diareduction capacity than conventional
mond instruments (see diagram).
in coarse-,
ZR-Diamonds™ are offered
gurations for a
medium-, and fine-grit confi
example, treparange of applications. For
is best
nation of zirconia restorations
aggressive,
carried out using the more
procedures,
coarse-grit diamonds. Fitting
for the lesshowever, are more appropriate
ne-grit instruaggressive, medium- or fi
ments. These unique, Komet-engineered
to modern dendiamonds are valuable aids
effective, efficient,
tal practices, offering an
adjusting highand easy-to-use option for
strength ceramic restorations.
Dr. Uwe Blunck, Senior physician at the Charité Berlin,
department of conservative dentistry and periodontology
11.02.13 12:48
leifer_ZA.indd 1
411199V0_PI_US_Zr-Sch
Helpful Hints:
Wheel-shaped versions also
are available for pre-polishing
(94012C.RA.110) and
for high-shine polishing
(94012F.RA.110).
20
Helpful Hints:
Information (Item 411199)
on our ZR-Diamond product
line, which includes more than
30 different instruments, is
available upon request.
Prof. Dr. Roland Frankenberger, Philipps University
of Marburg, Director of the medical center of oral and
maxillofacial at the University of Marburg
Dr. Jan Hajtó runs his own practice in Munich
Dr. Gernot Mörig, runs his own practice in Düsseldorf,
“ZahnGesundheit Oberkassel”
Prof. Dr. Lothar Pröbster, runs his own practice in
Wiesbaden, Lecturer at the University of Tubingen ,
department of dental prosthetics
Scientific advice - Sonic tips:
Private Lecturer. Dr. M. Oliver Ahlers
CMD-Centrum Hamburg-Eppendorf
and
University Hospital Hamburg-Eppendorf
Center for oral and maxillofacial surgery
Polyclinic for conservative and preventive dentistry
www.dr-ahlers.de
Komet USA LLC
3042 Southcross Blvd, Suite 101
Rock Hill, SC 29730
© Komet USA LLC · 09/2013 · 412287V0
Phone 888-566-3887
Fax
800-223-7485
info@kometusa.com
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