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129] 12-06
Review Article
CEREC - The power of technology
I. Kaur, K. Datta
Department of Prosthodontics, Pb Govt. Dental College and Hospital, Amritsar, Punjab, India
For correspondence
Inderpreet Kaur, Department of Prosthodontics, Pb Govt. Dental College and Hospital, Amritsar, Punjab, India.
E-mail: sardjeet@yahoo.com
CEREC is an acronym for chairside economical restoration of esthetic ceramics. Translated, it means that a dentist
can economically restore damaged teeth in a single appointment using a high-quality ceramic material that
matches the natural colour of other teeth. With over 7,000,000 restorations placed since the introduction of CEREC
m
technology in 1987, CEREC is one of the most researched restorative systems in the market, with documented
o
fr
success rate of more than 90% after 10 years. It uses a sophisticated combination of high-tech precision machinery
and computer technology to produce custom restorations that include 3/4 crowns, full crowns, veneers, inlays and
d ns
onlays. The CEREC 3D system allows the dentist to take digital impression with 100% control of the margin fit,
a
n lo tio
aesthetics, proximal contacts and the occlusal surface. With ongoing research and development, the CEREC
system has earned its role in dental history as the technology that gives patients one of the finest restorations in the
world in only one visit.
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Key words: Chairside economical restoration of esthetic ceramics, crowns, marginal fit, metal free ceramic
restorations
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rf e w P m).
Technological advances have contributed r
immeasurably to efficient procedures, quality treatment no .cand
fo kAesthetics
�
eye-pleasing
o andconvenience converge to offer an
quickly obtained solution to
and patient satisfaction. Chairside economical
b le ed damaged o wrestorations
teeth in a single visit.
restoration of esthetic ceramics (CEREC), a computer-
assisted design/computer-assisted manufacture kn
Ceramic
li a (CAD/M dantiabrasive
�
and
are metal free, biocompatible,
plaque resistant.
CAM) development that has been on the market
years, is one such innovation. Capable v
a b y a e we are able to restore teeth to their originaltechniques,
for 15 Using
� CEREC and advanced-bonding
a of providing
durable, cosmetic, nonmetal restorations likedcrowns,.m and function.
strength
veneers etc. in only one appointment is andtine less thanw More than seven million CEREC restorations have
F
an hour, the efficient use of the CEREC
o s
unit w
contributes
�
been performed worldwide.
D
P te h (w
markedly to quality care, patient satisfaction and practice CEREC is ideal for crowns, veneers and fillings.
�
profit.
WHAT IS CEREC? h
is si HOW CEREC WORKS? [2]
T a Digital impression
CEREC is an acronym for chairside economical After examining the tooth and determining the course
restoration of esthetic ceramics. CEREC system of treatment, we prepare the tooth for restoration,
(Siemens/Pelton and Crane, Charlotte, NC) [1] was similarly to traditional treatment methods. The prepared
developed in 1985 by two Swiss researchers, a dentist tooth will be coated with a safe, tasteless powder. The
and an electronics engineer, from the University of CEREC acquisition unit is mobile and houses a computer
Zurich. CEREC is the newest innovation in ceramic and the CEREC camera. CEREC then uses a state-of
cosmetic dentistry. It uses a sophisticated combination the-art digital 3D camera to create an optical impression.
of high-technology, precision machinery and computer This digital image replaces the physical impression
technology to produce custom restorations that required in traditional procedures. So, no longer waits
include 3/4 crowns, full crowns, veneers, inlays and are required while a tray of impression material hardens
onlays. in patient’s mouth.
What should one know about CEREC? Computer aided design
� CEREC is a proven technology, with more than a The computer and CEREC 3D software converts the
decade of clinical research and documentation. digital picture to a 3D virtual model of the prepared
The Journal of Indian Prosthodontic Society | September 2006 | Vol 6 | Issue 3 115
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Kaur I, et al.: Chairside economical restoration of esthetic ceramics
tooth. The dentist then designs the restoration right on � All design windows can be open at once.
screen using the software while the patient waits. This The new CEREC 3 software is Windows based
software can assist the dentist with designing any allowing greater compatibility and sharing
tooth restoration like crowns, inlays, onlays and veneers. possibilities.[4]
Once the dentist has designed the restoration (about
5 min), he or she clicks a button and the design data CEREC crowns
is communicated via a wireless radio signal to the To understand the CEREC crown, we need a little
CEREC milling unit. background in the construction of a crown.
Mill and place How crowns are made?
Exact design specifications are sent to the on-site Usually a crown takes two visits: on the first visit,
milling machine to create the restoration while the the tooth is prepared and an impression is taken. This
patient waits. The dentist selects a ceramic block that impression is sent to a laboratory, where the crown
matches the shade of the tooth being repaired. He then will be made. Meanwhile, the patient wears a temporary
inserts the block into the milling unit. The data from m
crown made with some type of plastic material. On the
o
the acquisition unit is used to direct two diamond-
coated burs to carve the block into the indicated shape fr
second appointment, the temporary crown is removed
and the durable crown is placed on the prepared tooth.
of the restoration. This process usually takes 8-18 min d s
CEREC one-visitacrownsn
depending on the size and type of restoration. After
the milling is finished, the dentist polishes the finished
n lo available
A recent innovation tio in the offices of some
filling or crown and bonds it into place.
is milled o
w lica'CAD-CAM'
cosmetic dentists is the
by a computer
crown. This crown
to fit the tooth precisely, thus
CEREC 3D
d theublaboratory step in manufacturing the
eliminating
e P ).
crown.
e
The latest incarnation of the CEREC system is the r
f w of m
CEREC 3D, which provides a versatile, relatively simple, r Advantages
user-friendly method for fabricating aesthetico 1. CEREC o o
f kthen dentist.cand are
CEREC
crowns made in one visit, saving both
restorations chair side without involving a dental
e 2.d WithoCEREC,
laboratory. Sirona’s CEREC 3 was introduced in l2000.
[3]
the patient time.
w there is no need for a temporary
b e n whichfor eliminates
CEREC 3D is a complete and unique system ithatla allowsM ddiscomforts
However, CEREC 2 continues to be sold and supported. crown,
k the patient.
one of the potential
v a bfitting
dentists to mill solid ceramic producing perfectly y 3.e CEREC crowns have no metal in them and thus are
crowns and veneers in a single visit. a Dental).
The system
d is
. m aesthetic. Although the PFM can mimic natural
is e w tooth
manufactured by Sirona (formerly Siemens
3D software allows the dentist to taket an optical
The appearance, the metal limits translucency and
D F andogoson to design
impression with an infrared camera w can sometimes show through as a dark line,
especially at the gum line.
h w
P te contacts( and the for fillings.
perfectly fitting restorations. The dentist has 100% 4. CEREC material and technology can also be used
is sconsiderations
control of the margin fit, proximal
i Since they are made out of porcelain,
accommodated in T
h a
occlusal surface. Aesthetic can be
the design. The advanced ‘six axis’
they are more durable than typical white composite
fillings.
milling machine [Figure 1] produces the restoration 5. The thermal expansion of the CEREC material is
within 10 min. This sophisticated machine works to similar to that of teeth which means eating hot and
within 50 micron. The ceramic can be stained and cold food will not cause differential expansion/
glazed. Characterization can also be done in the clinic. contraction of the restored tooth, as in the case of
metallic restorations.
So what’s new?
� Milling chamber is separate from the imaging/ Disadvantages of CEREC
designing unit. 1. Since CEREC crowns are milled out of a single
� The system is now Windows based. block of ceramic, it is difficult to incorporate into
� CEREC 3 can be used in conjunction with a CEREC them the subtle colour gradients of natural teeth.
2 by using the ‘Link’ software. There are a very few cosmetic dentists that are
� Two burs (one is tapered) do the cutting instead of using external stains to create natural-looking
one bur and one diamond wheel. dentistry for the front teeth, but doing this is
� No ‘adjust’ process (time savings). painstaking and difficult. Conventional porcelain
� Faster milling times (5 min savings). crowns are made with a variety of colours in order
� Greater occlusal anatomy. to look natural.
116 The Journal of Indian Prosthodontic Society | September 2006 | Vol 6 | Issue 3
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Kaur I, et al.: Chairside economical restoration of esthetic ceramics
om
Figure 1: The six-axis milling machine
fr Figure 4: The milling of the coping is completed
ad ns
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Figure 2: Die is inserted into the scanning-milling chamber Figure 5: Milled coping placed on the master die to verify fitr
DF os w
P te h (w
his si
T a
Figure 6: Margins are finished to final thickness with rubber wheels
results through their clinically proven CEREC and
VITA In-Ceram technologies. Crown and bridge
copings are milled out of a single solid block of VITA
In-Ceram material. Precise software design is able to
accurately set margins, coping thickness and porcelain
support.
Figure 3: Milling block selected and inserted into the block holder
The advantage of CEREC
X-rays penetrate CEREC porcelain so the dentist can
2. CEREC technology is expensive see problems, if they develop, down the road. It is
CEREC used as InLab copings difficult to see what is happening under traditional
CEREC InLab copings provide strong and aesthetic metal or porcelain-to-metal crowns with dental X-ray.
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Kaur I, et al.: Chairside economical restoration of esthetic ceramics
om
Figure 7: When coping is completed, In-Ceram infiltration glass is Figure 10: Ceramic is fired according to manufacturer's
applied
fr recommendations
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rf e w P m). Figure 11: Subsequent applications of ceramic made and fired to
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complete natural anatomical form
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Figure 8: Coping is ready for ceramic application
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DF os w
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his si
T a Figure 12: Restoration polished to create final surface characterization
and luster
posterior crowns and 3-unit bridges.
3. Zirconia (750 Mpa) is ideal for high strength
posterior crown and bridge frameworks.
Figure 9: Dentin, enamel and effect powders are applied in The preparations should have clearly defined margins
conventional manner, concentrating on tooth shape and development
of natural occlusal anatomy
and inner edges.
Recommended cements for copings adhesive bonding or
conventional cementation can be used.
MATERIALS AND METHODS
OTHER USES OF CEREC
Three materials are available for almost any clinical
indication: Fillings (inlays and onlays)
1. Spinell (350 Mpa) for highly aesthetic anterior CEREC fillings (inlays and onlays) are superior to
crowns. amalgam or composite fillings because of their superior
2. Alumina (525 Mpa) for translucent anterior and aesthetics and strength. With enamel-like material, they
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Kaur I, et al.: Chairside economical restoration of esthetic ceramics
look and feel like real teeth and are longer lasting. and development of natural occlusal anatomy [Figure 9].
And because they are metal free, CEREC onlays have Ceramic is fired according to manufacturer’s
a more natural look and feel and can help preserve recommendations [Figure 10]. Subsequent applications
healthy, natural tooth structure. of ceramic are made and fired to complete natural
anatomical form [Figure 11]. Restoration is then polished
Veneers to create final surface characterization and luster
Unlike composite veneers, CEREC uses enamel-like [Figure 12].
material that looks and feels more like real teeth.
CONCLUSION
Fabrication of tooth using CEREC[5]
After tooth preparation is completed, an impression, Since the first patients had been treated with CEREC
opposing cast and interocclusal records are taken. inlays in 1985 at the University of Zurich, from this
With the creation of master models, opposing casts time CEREC has undergone continuous technical and
are mounted in proper relationship. At this time we clinical developments. Today it is used worldwide by
depart from traditional ‘lost wax’ techniques and m
a growing number of dentists in their practices. With
o
move into the new world of digital dentistry. All
case information is first entered into the computer, fr
15 years of research and development and more
restorations placed than any comparable unit, the CEREC
including the doctor, patient and teeth to be restored. d ns
has earned its role in dental history as the technology
a
Next the die is inserted into the scanning milling
chamber to be automatically laser scanned [Figure 2].
n lo tio
that gives patients one of the finest restorations in the
world in only one visit.
This information is downloaded into the computer
where the coping design phase takes place. Once o w lica
ACKNOWLEDGEMENT
the design is complete, the information is d ub
automatically uploaded into the milling machine and
e eguideto Dr.express
I want
P . Datta for her timely help,
my heartfelt thanks to my teacher
)Kusum
the appropriate milling block is selected and inserted rsupportwand guidance
f
and (Mrs)
m in the completion of this
into the block holder [Figure 3]. Milling of the coping r o o
is completed [Figure 4]. The milled coping is placed
fo kn .c
endeavour.
on the master die to verify fit [Figure 5] and the
le eREFERENCES
margins are finished to final thickness with rubber
b d ow
wheels [Figure 6].
i la M dkn 1. Calamia JR. Advances in computer-aided design and
In-ceram technique v a by e computer-aided manufacture technology. Curr Opin
afiredinfiltration
When the coping is complete, In-Cream
dto the.m Cosmet Dent 1994;67-73.
glass is applied [Figure 7] and
is e
manufacturer’s recommendations. Excesst infiltrationw
2. Morin M. CEREC: The power of technology. Compend
Contin Educ Dent 2001;22:27-9.
F s w
o application 3. Allen KL, Schenkel AB, Estafan D. An overview of the
this time, coping is ready D
glass is removed with aluminum oxide blasting. At
P te h
for ceramic (w 4.
CEREC 3D CAD/CAM System. Gen Dent 2004;52:234-5.
http://www.planetcerec.com/cerec3.html
[Figure 8].
h is si 5. http//:www.sironainlab.com
T a
Ceramic technique
Dentin, enamel and effect powders are applied using
Source of Support: Dr. Jatinder Singh,
Conflict of Interest: None declared.
conventional techniques concentrating on tooth shape
The Journal of Indian Prosthodontic Society | September 2006 | Vol 6 | Issue 3 119
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