4. is an area of dentistry utilizing CAD/CAM technologies to produce
different types of dental restorations, including crowns, crownlays
,veneers, inlays and onlays, fixed bridges, dental implant restorations
and orthodontic appliances.
5. History:
CAD/CAM usage in dentistry began in the mid 1980s.
Initially, this computerized technology was cumbersome
and basically a novelty, requiring inordinate amounts of time
to produce a viable product. This reality limited its practical
usefulness to the dental laboratory setting, rather than the
dental practice as time constraints precluded chair side (in
the dental office) usage. As adjunctive techniques
,software, and available materials improved over
time, CAD/CAM usage in the dental practice setting
became a reality. Thus "chair side" CAD/CAM technology
affords the practitioner the ability to produce tooth-colored
prosthetic dental restorations on-site in a matter of hours
6.
7. The concept of chairside CAD/CAM restoration differs from
conventional dentistry in that the prosthesis is typically
luted or bonded in place the same day, whereas
conventional dental prosthesis of larger size such as
crowns have temporaries placed for several weeks while a
dental laboratory produces the restoration off-site
8. The patient returns weeks later, the temporary is removed, and then the
laboratory made crown is then cemented or bonded in place. Because the
CAD/CAM restoration is bonded the same day, the principles applied in
preparing the tooth for a crown or other prosthesis are typically more
conservative. Bonding is more effective on tooth enamel. As such, the teeth
need to be prepared such that the enamel layer is not removed to expose the
tooth dentin. Permanent bonding of the restoration is best achieved by bonding
the fitting surfaces of the restoration to the prepared enamel surfaces of the
tooth. Consequently, less tooth surface removal is usually the normal.
9. Process:
Typically CAD/CAM dental restorations are milled from solid blocks of
ceramic or composite resin closely matching the basic shade of the
restored tooth. Metal alloys may also be milled or otherwise digitally
produced..
10. After decayed or broken areas of the tooth are corrected by the
dentist, an image (scan) is taken of the prepared tooth and the
surrounding teeth. This image, called a digital impression, draws
the data into a computer
11.
12. Then proprietary software is used to create a replacement part for the missing areas of
the tooth, essentially creating a virtual restoration. This is called reverse engineering.
The software sends this virtual data to a milling machine where the replacement part for
the defect (the dental restoration) is carved out of a solid block of ceramic or composite
resin. Stains and glazes are fired to the surfaces of the milled ceramic crown or bridge
to correct the otherwise monochromatic appearance of the restoration. The resulting
restoration can then be adjusted in the patient’s mouth and cemented or bonded in
place
13.
14. CAD/CAM dental software
products
CEREC, software for manufacturing
crowns, veneers, onlays and inlays can be
prepared, using different types of ceramic
material.
Delcam dental solutions, for the
design and manufacture of copings and bridge
frameworks, including full
crowns, abutments, dental bars, inlays/onlays
and implant bridges
17. the components of the Cerec
unit?
1. The Acquisition Unit:
The acquisition unit is made up of a
tower with a computer inside it, an lcd
computer screen, camera unit for
imaging teeth and program software for
creating dental restorations.
18. 2. The Milling Unit
This is a box shaped chamber
that is separate from the
acquisition unit. It wirelessly
receives directions from the
acquisition unit and mills(cuts)
crowns, onlays, inlays and
2. The Milling Unit
veneers from porcelain or
composite(acrylic) blocks. The
milling unit featurs a self
contained water supply and 2
diamond coated burs that create
the specified shape of computer
designed restorations.
19. Why Perform CEREC in Dentistry? What
are its Benefits?
1. Saves Time: Most restorations are completed in a single visit.
That means NO return trips to the dentist.
20. 2. No Temporaries: Receiving crowns or porcelain fillings in a single visit
means not 2-3 week wait with temporary material on your tooth while a
lab makes the permanent restoration. ---That means NO temporaries to
fall off or out inconveniencing the patient further by returning to the
office to have it replaced.
3. Less Novacaine: Because single visits for Cerec Dentistry are the
standard.
21. 4. Less Tooth Drilling: Because Cerec restorations are
placed with extremely strong cement(glue), more tooth
structure can generally be preserved during a
procedure.
.
5. Cerec Restorations are very Accurate: These
precisions restorations are performed under high
magnification on the computer screen, greatly
enhancing accuracy levels.
6. Cerec Restorations are very strong having
published 10 year success rates exceeding 90%
survival.
23. dental scanners
Solutionix, 3D
dental scanners, for
the quality
measurement of
dental models and
impressions.
Straumann
CARES Digital
Solutions, CS2
Scanner
25. Applications:
Model scanning from single unit to full
arch
Full arch scanning with palate for partial
frameworks
Multi – die scanning & designing
capabilities
Scanning occlusions using check-bites or
on positive models
using our patented “axis-finder”
technique
Impression scanning up to full arch
Replication of wax-ups
Scanning implants for custom abutments
26. CROWN & BRIDGE
Design: single unit to full bridge,
simple coping, clinical coping, dental band,
¾ crown, full crown, veneer Managed by
clinical parameters
Custom anatomy kit creation tool
Automatic proposal of anatomy
Editing tools with morphing and transformation
Advanced connector tools and shape editing
Highly productive, easy to use
Virtual Waxing tools – scaling & morphing
Different output formats optimized with respect
to
manufacturing solutions
Full anatomic veneer design for advanced
smile line
30. Special Considerations for CAD/CAM Dentistry
CAD/CAM technology is not a replacement for the
accuracy and talent provided by a dentist or dental
laboratory technician. Dentists must be precise in
creating the initial tooth CAD/CAM technology, tend to
be a more expensive restorative solution. However,
even though the materials for CAD/CAM restorations
might cost more, the expense incurred by the dental
laboratory and/or the dentist may not be passed onto
the patient.
Also, there is no additional fee or cost to have a
restoration placed in one visit as opposed to two.
31. preparation; both dentists and laboratory technicians must be
accurate when taking the digital impression and drawing the
restoration.
Equally important is the accuracy and skill with which they design
a restoration, particularly since the fit of a restoration is critical to
preventing future tooth damage. For example, an ill-fitted crown,
veneer, inlay or onlay can leave space between the teeth, or
between the tooth preparation and the restoration. This could lead
to an increased risk of infection or disease.
32. When to Choose CAD/CAM Dentistry
It is important to note that not every tooth can be treated with a
CAD/CAM restoration. Your dentist will determine if a CAD/CAM
restoration is among the appropriate treatment options for your
condition. Additionally, despite improvements in the esthetics of
CAD/CAM materials, patients may find that some CAD/CAM
restorations look too opaque and lack natural characterizations.
Depending on the type of restoration that's needed (such as
inlays/onlays), your dentist may prefer conventional laboratory
fabrication techniques that have a longer and more proven track record
for accuracy of fit. Therefore, patients must discuss their particular
situation and desires with their dentist, who will make the final treatment
decision based on a thorough examination.
