This document provides an overview of CAD/CAM technology in dentistry. It defines CAD/CAM and discusses the evolution of digital impressions from the early 1980s. It describes the key components of CAD/CAM systems including scanners, design software, and milling devices. It outlines different production concepts for chairside, laboratory, and centralized production. It also discusses the various materials that can be milled like metals, ceramics, and zirconia as well as future technologies like laser sintering. Finally, it highlights the significance of CAD/CAM for dentists and important preparation considerations.
An introduction to dentistry in the digital ageAmit Paryag
An overview of current technlogies available and an overview of imprortant concerns about getting into dentistry in the digital age. The content herein is referenced as much as possible and disemminated without charge for discussion and eduation purposes.
Dentistry in the digital age
Digital dentistry refers to the use of dental technologies or devices to carry out dental procedures rather than using mechanical or electrical tools. The use of digital dentistry can make carrying out dental procedures more efficient than using mechanical tools, both for restorative as diagnostic purposes. 'Godfather' of Digital Dentistry is the French professor François Duret, who invented dental CAD/CAM in 1973.
For more information, you can book an appointment at
Dr Sachdeva's Dental Aesthetic And Implant Institute,
I 101, Ashok Vihar Phase 1, Delhi- 110052
Contact us at
• Phone : +919818894041,01142464041
• Our Websites:
• www.sachdevadentalcare.com
• www.dentalclinicindelhi.com
• www.dentalimplantindia.co.in
• www.dentalcoursesdelhi.com
• www.facialaestheticsdelhi.com
• Google+ link: https://goo.gl/vqAmvr
• Facebook link: https://goo.gl/tui98A
• Youtube link: https://goo.gl/mk7jfm
• Linkedin link: https://goo.gl/PrPgpB
• Slideshare link : http://goo.gl/0HY6ep
• Twitter Page : https://goo.gl/tohkcI
• Instagram page : https://goo.gl/OOGVig
This presentation gives a brief overview of the current intra oral scanner market as of October 2018. Comparisons of accuracy and a brief overview of some of the software packages available to allow you to go to guide.
360 Visualise: Last year 360 Visualise sold more CBCT in the UK than any other company. Our first scanning centre in Ilkley was the first independent CBCT referral centre outside of London and we now scan over 3000 patients each year. This experience gives us a unique insight into the clinical needs and processes of the dental profession and what can be achieved with new software packages.
New processes are quickly developing enabling implant dentists to quickly scan, plan and print implant drilling guides using third-party applications such as SMoP & BlueSkyBio. The price of these services has reduced dramatically over the past year and with increased competition is set to continue to improve and become more accurate and efficient.
Working with so many dentists and labs, 360 Visualise are in a unique position to support you and your 3D scanner as this incredible technology continues to evolve over the coming years.
An introduction to dentistry in the digital ageAmit Paryag
An overview of current technlogies available and an overview of imprortant concerns about getting into dentistry in the digital age. The content herein is referenced as much as possible and disemminated without charge for discussion and eduation purposes.
Dentistry in the digital age
Digital dentistry refers to the use of dental technologies or devices to carry out dental procedures rather than using mechanical or electrical tools. The use of digital dentistry can make carrying out dental procedures more efficient than using mechanical tools, both for restorative as diagnostic purposes. 'Godfather' of Digital Dentistry is the French professor François Duret, who invented dental CAD/CAM in 1973.
For more information, you can book an appointment at
Dr Sachdeva's Dental Aesthetic And Implant Institute,
I 101, Ashok Vihar Phase 1, Delhi- 110052
Contact us at
• Phone : +919818894041,01142464041
• Our Websites:
• www.sachdevadentalcare.com
• www.dentalclinicindelhi.com
• www.dentalimplantindia.co.in
• www.dentalcoursesdelhi.com
• www.facialaestheticsdelhi.com
• Google+ link: https://goo.gl/vqAmvr
• Facebook link: https://goo.gl/tui98A
• Youtube link: https://goo.gl/mk7jfm
• Linkedin link: https://goo.gl/PrPgpB
• Slideshare link : http://goo.gl/0HY6ep
• Twitter Page : https://goo.gl/tohkcI
• Instagram page : https://goo.gl/OOGVig
This presentation gives a brief overview of the current intra oral scanner market as of October 2018. Comparisons of accuracy and a brief overview of some of the software packages available to allow you to go to guide.
360 Visualise: Last year 360 Visualise sold more CBCT in the UK than any other company. Our first scanning centre in Ilkley was the first independent CBCT referral centre outside of London and we now scan over 3000 patients each year. This experience gives us a unique insight into the clinical needs and processes of the dental profession and what can be achieved with new software packages.
New processes are quickly developing enabling implant dentists to quickly scan, plan and print implant drilling guides using third-party applications such as SMoP & BlueSkyBio. The price of these services has reduced dramatically over the past year and with increased competition is set to continue to improve and become more accurate and efficient.
Working with so many dentists and labs, 360 Visualise are in a unique position to support you and your 3D scanner as this incredible technology continues to evolve over the coming years.
The presentation gives you an overview of the digital impression as well as intraoral scanners. Trios 3 of 3Shape was specifically discussed in the presentation.
Brief introduction to the latest innovations that are used at dentistry, where equipment used are fully digitized and computerized, with the differences between using conventional methods and digital equipment in dentistry.
Main equipment to be discussed are dental imaging systems and CAD/CAM systems
Intraoral scanners for digital impressions aren't what they used to be. In fact, they' re becoming the standard of care. If you're thinking of purchasing one, here are the factors you'll need to consider.
For more information, you can book an appointment at
Dr Sachdeva's Dental Aesthetic And Implant Institute,
I 101, Ashok Vihar Phase 1, Delhi- 110052
Contact us at
• Phone : +919818894041,01142464041
• Our Websites:
• www.sachdevadentalcare.com
• www.dentalclinicindelhi.com
• www.dentalimplantindia.co.in
• www.dentalcoursesdelhi.com
• www.facialaestheticsdelhi.com
• Google+ link: https://goo.gl/vqAmvr
• Facebook link: https://goo.gl/tui98A
• Youtube link: https://goo.gl/mk7jfm
• Linkedin link: https://goo.gl/PrPgpB
• Slideshare link : http://goo.gl/0HY6ep
• Twitter Page : https://goo.gl/tohkcI
• Instagram page : https://goo.gl/OOGVig
One of the best seminar of the author. Covered in detail regarding the increasing vertical dimension, centric relation, methods to record centric relation, philosophies of occlusion and in detail everything about full mouth rehabilitation.
Digital Removable Complete Denture—an Overview.pptxNishu Priya
There is a great responsibility for a dentist and a dental technologist to fabricate high-quality removable complete
dentures. Factors, such as a meticulous diagnosis and treatment planning, a personal communication between the
involved persons, and a profound knowledge of the clinical and technical possibilities, should lead to an easy, simple,
cost-effective, and highly satisfying denture fabrication workflow.
Indian Dental Academy: will be one of the most relevant and exciting
training center with best faculty and flexible training programs
for dental professionals who wish to advance in their dental
practice,Offers certified courses in Dental
implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic
Dentistry, Periodontics and General Dentistry.
The presentation gives you an overview of the digital impression as well as intraoral scanners. Trios 3 of 3Shape was specifically discussed in the presentation.
Brief introduction to the latest innovations that are used at dentistry, where equipment used are fully digitized and computerized, with the differences between using conventional methods and digital equipment in dentistry.
Main equipment to be discussed are dental imaging systems and CAD/CAM systems
Intraoral scanners for digital impressions aren't what they used to be. In fact, they' re becoming the standard of care. If you're thinking of purchasing one, here are the factors you'll need to consider.
For more information, you can book an appointment at
Dr Sachdeva's Dental Aesthetic And Implant Institute,
I 101, Ashok Vihar Phase 1, Delhi- 110052
Contact us at
• Phone : +919818894041,01142464041
• Our Websites:
• www.sachdevadentalcare.com
• www.dentalclinicindelhi.com
• www.dentalimplantindia.co.in
• www.dentalcoursesdelhi.com
• www.facialaestheticsdelhi.com
• Google+ link: https://goo.gl/vqAmvr
• Facebook link: https://goo.gl/tui98A
• Youtube link: https://goo.gl/mk7jfm
• Linkedin link: https://goo.gl/PrPgpB
• Slideshare link : http://goo.gl/0HY6ep
• Twitter Page : https://goo.gl/tohkcI
• Instagram page : https://goo.gl/OOGVig
One of the best seminar of the author. Covered in detail regarding the increasing vertical dimension, centric relation, methods to record centric relation, philosophies of occlusion and in detail everything about full mouth rehabilitation.
Digital Removable Complete Denture—an Overview.pptxNishu Priya
There is a great responsibility for a dentist and a dental technologist to fabricate high-quality removable complete
dentures. Factors, such as a meticulous diagnosis and treatment planning, a personal communication between the
involved persons, and a profound knowledge of the clinical and technical possibilities, should lead to an easy, simple,
cost-effective, and highly satisfying denture fabrication workflow.
Indian Dental Academy: will be one of the most relevant and exciting
training center with best faculty and flexible training programs
for dental professionals who wish to advance in their dental
practice,Offers certified courses in Dental
implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic
Dentistry, Periodontics and General Dentistry.
AN OVERVIEW OF THE CEREC 3D CAD/CAM SYSTEM / dental implant courses by Indian...Indian dental academy
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Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
eBook - Top Six Ways an Integrated EDR Improves Your Health CenterNextGen Healthcare
If you have doubts about whether you need an electronic dental record (EDR), look no further. This eBook packs the punch you need to see how the right EDR can really revolutionize your practice.
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Allceramic restorations /certified fixed orthodontic courses by Indian dental...Indian dental academy
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The currently developed scope of dental restorations and prosthodontics’ rehabilitation through the use of CAD/CAM system is to create an appropriate design and fitness of different dental restorations like zirconium crown, fixed bridges, dental (veneers, inlays, onlays), dental implant restorations, orthodontic appliances, and removable dentures (complete and/or partial).
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Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
With the conventional impression procedures, lost-wax-casting technique in the production of metal castings or frameworks, their accuracy is greatly influenced by the properties of the impression materials, investment and casting alloy.
Because traditional procedures are time consuming,
efforts have been made to replace these with computer-assisted procedures.
For the full video of this presentation, please visit:
https://www.embedded-vision.com/platinum-members/8tree/embedded-vision-training/videos/pages/sept-2017-alliance-vitf
For more information about embedded vision, please visit:
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Erik Klaas of 8tree delivers the presentation "The Evolution of Depth Sensing: From Exotic to Ubiquitous" at the Embedded Vision Alliance's September 2017 Vision Industry and Technology Forum. In his presentation, Klaas covers the following topics:
▪ Why is metrology important?
▪ Categorization of common methodologies for dimensional measurements
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Application of 3 d printing in construction management (1) (1)adarshkaushik6
This ppt is completely about 3d printing and its application in construction. This ppt is done by students of Thiagarajar college of engineering Madurai.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
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How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
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Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
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In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
2. Presented by: Dr. Abbasi Begum M
Department of prosthodontics
Narayana dental college & hospital
F. Beuer et al.
BRITISH DENTAL JOURNAL, VOLUME 204, MAY 10 2008
2
3. 1. Introduction
2. Definition
3. CAD/CAM Production Concepts In Dentistry
Chairside production
Laboratory production
Centralised production
4.CAD/CAM components
Scanner
Design software
5.Milling variants
6.Materials for CAD/CAM processing
7.Future technologies
8.Significance for the dentist
9.Evaluation – advantages and disadvantages of computer-
assisted production
Contents
3
5. Definitions
“Impression” is defined as “a negative likeness or copy in
reverse of the surface of an object; an imprint of the teeth
and adjacent structures for use in dentistry”-GPT-8
CAD-CAM: Acronym for Computer Aided Design-Computer
Aided Manufacturer (or Computer Assisted Machining)-GPT-
8
Sintering is the process of compacting and forming a solid mass
of material by heat or pressure without melting it to the
point of liquefaction.
Sintering happens naturally in mineral deposits or as a
manufacturing process used with metals, ceramics, plastics,
and other materials.
5
6. Evolution of Digital Impressions
• It began in 1980’s with the introduction of CAD/CAM in the
field of dentistry, pioneered by Procera and Cerec.
• Dr. Duret was the first to develop dental CAD/CAM
• From 1971, he began to fabricate crowns with an optical
impression of abutment followed by designing and milling.
• Dr. Mormann developed CEREC System
• Dr. Anderson developed Procera System
• The current digital impression devices available are the
recently introduced Cadent iTero (Carlstadt, N.J.) and the 3M
ESPE Lava Chair-side Oral Scanner C.O.S. (St. Paul,Minn.)
CAD / CAM IN DENTISTRY- A Review. Dr. Kalpana D, IJRID Volume 5 Issue 2 Mar-Apr. 20156
7. Messy impression
procedures
Gagging tendencies
Poor Bond of
Impression
Material to the
Tray
Limited mouth
opening
Stone Model
Discrepancies
Tedious lab
procedures
PROBLEMS
ASSOCIATED WITH
CONVENTIONAL
TECHNIQUES
Sharma S et al IMPRESSION; DIGITAL VS
CONVENTIONAL: A REVIEW. Annals of Dental
Specialty Vol. 2; Issue 1. Jan – Mar 2014
7
9. Components of CAD/CAM Systems
• 1. A digitalisation tool/scanner that
transforms geometry into digital data that
can be processed by the computer
• 2.Software that processes data and,
depending on the application, produces a
data set for the product to be fabricated
• 3. A production technology that transforms
the data set into the desired product.
9
10. CAD/CAM PRODUCTION CONCEPTS IN DENTISTRY
• All components of the CAD/CAM system are located in the
dental surgery
• Fabrication of dental restorations at chairside without a
laboratory procedure
• Intra-oral camera, which replaces a conventional impression
in most clinical situations.
• E.g. Cerec® System (Sirona), functions with water-cooling, a
variety of materials can be processed, from glass-ceramic to
high performance oxide ceramic.
10
11. • The dentist sends the impression to the laboratory
where a master cast is fabricated first.
• The remaining CAD/CAM production steps are
carried out completely in the laboratory.
• With the assistance of a scanner, 3-dimensional
data are produced on the basis of the master die.
These data are processed by means of dental
design software.
11
12. • After the CAD-process the data will be sent to a
special milling device that produces the real
geometry in the dental laboratory.
• Finally the exact fit of the framework can be
evaluated and, if necessary, corrected on the basis
of the master cast.
• The ceramist carries out the veneering of the
frameworks in a powder layering or overpressing
technique
12
14. • Many production centres also offer laboratories
without a scanner the possibility of sending the
master cast to the centre for scanning, designing
and fabrication.
• The additional veneering of the frameworks for
prosthetic restorations is carried out in the dental
laboratory.
• Recently, dentists have been offered the possibility
of sending the impression directly to the production
centre (biodentis). This application is presently
limited to ceramic inlays only.
14
15. An additional simplification in CAD/
CAM production consists of
intraoral data collection (optical
impression)
Possible to directly judge the
quality of the preparation
intraorally, before data are finally
sent to the dental laboratory or
production centre.
15
17. SCANNER
• Data collection tools that measure three dimensional
jaw and tooth structures and transform them into
digital data sets.
a) Optical scanners
• The basis of this type of scanner is the collection of
three-dimensional structures in a so-called
‘triangulation procedure’.
• The source of light (eg laser) and the receptor unit are
in a definite angle in their relationship to one another.
Through this angle the computer can calculate a
three-dimensional data set from the image on the
receptor unit. 17
18. • Either white light projections or a laser beam can
serve as a source of illumination
• Lava Scan ST (3M ESPE, white light projections)
• Everest Scan (KaVo, white light projections)
• es1 (etkon, laser beam).
White light projector pattern during the scanning process by an optical scanner 18
19. b) Mechanical scanner
• The master cast is read mechanically line-by-line by means of
a ruby ball and the three-dimensional structure measured
• E.g. Procera Scanner from Nobel Biocare
• A high scanning accuracy
• The diameter of the ruby ball is set to the smallest grinder in
the milling system, with the result that all data collected by
the system can also be milled
Drawbacks
• Very expensive
• Long processing times compared to optical systems.
19
20. Design software
• The data of the construction can be stored in various
data formats.
• Standard transformation language (STL) data format-
commonly used
• Some systems allow crowns and FPD framework
construction on one hand, on the other hand some
systems also offer the opportunity to design full
anatomical crowns, partial crowns, inlays, inlay retained
FPDs, as well as adhesive FPDs and telescopic primary
crowns.
20
21. Processing devices
• The construction data produced with the CAD
software are converted into milling strips for the
CAM-processing and finally loaded into the milling
device.
• Processing devices are distinguished by means of
the number of milling axes: • 3-axis devices • 4-axis
devices • 5-axis devices.
21
22. a) 3-axis milling devices
• This type of milling device has degrees of
movement in the three spatial directions.
• The mill path points are uniquely defined by the X -,
Y -, and Z – values
Different possibilities of the working axis: 3 spatial directions X, Y and Z (3 axis milling
devices); 3 spatial directions X, Y, Z and tension bridge A (4 axis milling devices); 3
spatial directions X, Y, Z, tension bridge A and milling spindle B (5 axis milling devices)
22
23. • A milling of subsections, axis divergences and
convergences, however, is not possible. This demands a
virtual blocking in such areas.
• All 3-axis devices used in the dental area can also turn
the component by 180° in the course of processing the
inside and the outside
ADVANTAGES
• short milling times
• simplified control
• less costly than those with a higher number of axes.
• Examples of 3-axis devices: inLab (Sirona), Lava (3M
ESPE), Cercon brain (DeguDent).
23
24. b) 4-axis milling devices
• In addition to the three spatial axes, the tension bridge for the
component can also be turned infinitely variably (Fig. 3). As a result it
is possible to adjust bridge constructions with a large vertical height
displacement into the usual mould dimensions and thus save material
and milling time. Example: Zeno (Wieland-Imes).
c) 5-axis milling devices
Rotating the milling spindle (5th axis) enables the milling of complex
geometries with subsections, e.g, lower jaw FPDs on converging
abutment teeth (end molar tipped towards the medial plane) (Fig. 4),
or also crown and FPD substructures that, as a result of anatomically
reduced formation, demonstrate converging areas
24
25. Fig. 4 Pinned master cast of converging abutment teeth for a fixed partial denture
in the mandible. At least a 4 milling axis is required for the milling unit to fabricate
a substructure for this situation
25
26. MILLING VARIANTS
• Dry processing
• Zirconium oxide blanks with a low
degree of pre-sintering.
Advantages
• Minimal investment costs for the
milling device
• No moisture absorption by the die
ZrO2 mould, as a result of which
there are no initial drying times for
the ZrO2 frame prior to sintering.
Disadvantages:
The lower degree of pre-sintering results
in higher shrinkage values for the
frameworks.
e.g, Zeno 4030 (Wieland- Imes), Lava
Form and Cercon brain
• Wet milling
• Milling diamond or carbide cutter is
protected by a spray of cool liquid
against overheating of the milled
material.
• Metals and glass ceramic material in
order to avoid damage through heat
development.
• Zirconium oxide ceramic with a
higher degree of pre-sintering is
employed for the milling process. A
higher degree of pre-sintering results
in a reduction of shrinkage factor and
enables less sinter distortion.
• Everest (KaVo), Zeno 8060 (Wieland-
Imes), in Lab (Sirona).
26
27. MATERIALS FOR CAD/CAM PROCESSING
• Metals
• Resin materials
• Silica based ceramics
• Infiltration ceramics
• Oxide high performance ceramics
Yttrium stabilized zirconium
oxide
Aluminum Oxide (Al2O3)
27
28. Metals
• Titanium, titanium alloys and chrome cobalt alloys are
processed using dental milling devices
• Examples: coron (etkon: non-precious metal alloy),
Everest Bio T-Blank (KaVo, pure titanium).
Resin materials
• Used for the milling of lost wax frames for casting
technology
• Used directly as crown and FPD frameworks for long-
term provisional or for full anatomical long term
temporary prostheses
• Prefabricated semi-individual polymer blanks (semi-
finished) with a dentine enamel layer are provided by
one manufacturer (artegral imCrown, Merz Dental).
28
29. Silica based ceramics
• For the production of inlays, onlays, veneers, partial
crowns and full crowns .
• In addition to monochromatic blocks, various
manufacturers now offer blanks with multicoloured
layers [Vitablocs TriLuxe (Vita), IPS Empress CAD Multi
(IvoclarVivadent)], for the purpose of full anatomical
crowns.
• Lithium disilicate ceramic blocks are particularly
important in this group –High stability
• Used for full anatomical anterior and posterior crowns,
for copings in the anterior and posterior region and for
three-unit FPD frameworks in the anterior region due to
their high mechanical stability of 360 MPa.
29
30. Infi ltration ceramics
• Grindable blocks of infiltration ceramics are processed in porous,
chalky condition and then infiltrated with lanthanum glass.
• Vita In-Ceram Alumina (Al2O3): Crown copings in the anterior and
posterior region, three-unit FPD frameworks in the anterior region
• Vita In-Ceram Zirconia (70% Al2O3, 30% ZrO2):Crown copings in the
anterior and posterior region, three-unit FPD frameworks in the
anterior and posterior region. Has superior masking ability and is
suitable for discoloured abutment teeth
• VITA In-Ceram Spinell (MgAl2O4): Highest translucency of all oxide
ceramics and is thus recommended for the production of highly
aesthetic anterior crown copings, in particular on vital abutment
teeth and in the case of young patients
30
31. Oxide high performance ceramics
• Aluminum Oxide (Al2O3)
• Indicated in the case of
crown copings in the
anterior and posterior area,
and three-unit anterior FPD
frameworks.
• E.g. In-Ceram AL Block
(Vita), inCoris Al (Sirona)
available in an ivory-like
colour .
• Yttrium stabilised zirconium oxide
(ZrO2, Y-TZP)
• Excellent mechanical characteristics
• High flexural strength and fracture
toughness
• Framework material for crowns and
FPDs
• Implant abutments
• Addition of three molecules of Y2O3
results in a stabilising tetragonal
phase
• As a result of a transition to a
monoclinic phase can prevent the
progression of cracks in the ceramic
• Lava Frame (3M ESPE), Cercon Smart
Ceramics (Degu-Dent),
31
32. Processing can take place in different density
stages
• Green stage processing
• Green stage: blank without heat treatment i.e. , an
object pressed from ceramic powder and binding
agents.
• Processing is by means of carbide metal grinders
without liquid cooling.
• The green stage has an open porosity, and in firing a
25% linear shrinkage is to be expected. At present,
zirconium oxide is not processed as a green stage in
any of the CAD/CAM systems on the market.
32
33. White stage processing
• White stage: pre-sintered blanks. As a result of the
thermal pre-treatment the organic compressing
additives have vanished and the blank has an
adequate stability.
• As a result of pre-sintering, the white body has
already had shrinkage of approximately 5%.
Processing of white stage can be either with carbide
metal grinders without water cooling or with
diamond grinders with liquid cooling
33
34. Enlarged zirconium oxide after the milling
process before sintering to the desired
dimensions
34
36. Hot Isostatic Pressing Condition
• Advantages
• No sinter shrinkage, as a
result no sinter distortions
• No sinter furnace necessary
• No additional time needed
for sintering procedure.
• Disadvantages
• Devices with high rigidity and
stability necessary
• Longer milling times, resulting
in lower utilization of devices
• High wear of the cutters
• No colored blanks available on
the market yet.
36
37. FUTURE TECHNOLOGIES
• Generative production methods
• This method in contrast to grinding technology, do not
work by subtracting, but rather by Adding material.
• ‘Laser sintering devices’ are used to produce crown and
bridge frames from chrome cobalt alloys.
• Since the productivity of such devices is very high,
dental restorations can be produced very cost-
effectively.
• Geometries are conceivable with this technology that
cannot be realized with grinding technology.
37
38. SIGNIFICANCE FOR THE DENTIST
• The stability values of zirconium oxide ceramics permit
the use of this material as an alternative to metal
frames for permanent prostheses
• Production of long-term temporary prostheses has, as a
result of the use of a virtual wax up on the computer,
become faster, more convenient and more predictable
• The production of the definitive prosthesis should also
be carried out by CAD/CAM technology and represents
merely a copying process of the temporary prosthesis
into the definitive prosthesis by a different material.
38
39. IMPORTANT STEPS TO BE CONSIDERED BY THE
DENTIST
• Include appropriate tooth preparations with the
creation of a continuous preparation margin, which is
clearly recognisable to the scanner, for example in the
form of a chamfer preparation.
• Shoulderless preparations and parallel walls should be
avoided.
• A tapered angle of between 4° to 10° is recommended.
• Subsections and irregularities on the surface of the
prepared tooth as well as the ‘creation of troughs’ with
a reverse bevel preparation margin can be inadequately
recognized by many scanners
39
40. sharp incisor and occlusal edges are
to be rounded.
• The diameter of the smallest grinder
is 1 mm in most systems, so
structures smaller than 1 mm cannot
be milled precisely. The result is an
inaccurate fit.
• A 360 degree shoulder or chamfer
preparation is considered to be the
appropriate marginal preparation
geometries for CAD/CAM produced
all-ceramic restorations.
Reverse bevel preparation
40
41. EVALUATION – ADVANTAGES AND
DISADVANTAGES OF COMPUTER-ASSISTED
PRODUCTION
• ADVANTAGES
The quality of dental prostheses has improved
significantly by means of standardized production
processes.
Increased productivity
Possible to machine interesting new materials like
the high performance ceramics and titanium with
high accuracy.
41
42. DRAWBACKS
• The high investment for machines might overextend
the budget of smaller laboratories. Some
applications are limited due to software and
production procedures.
42
44. • CAD/CAM technology has already changed dentistry
and will replace more and more of the traditional
techniques in fabricating dental restorations.
44
45. References
1. An Overview of CAD/CAM and Digital Impressions by Paul Feuerstein, DMD
2. Optical impressions with Zfx IntraScan:The accurate basis for various kinds of
restorations Dr. Giovanni Pisoni. www.zfx-dental.com
3. Otto T, De Nisco S. Computer-aided direct ceramic Inrestorations: a 10- year
prospective clinical study of Cerec CAD/CAM inlays and onlays. Int J Pros- thodont
2002; 15: 122-128.
4. Reiss B. Clinical results of Cerec inlays in a dental practice over a period of 18 years.
Int J Comput Dent 2006; 9: 11-22.
5. Sjögren G, Molin M, van Dijken J W. A 10-year prospective evaluation of CAD/CAM-
manufactured (Cerec) ceramic inlays cemented with a chemically cured or dual-
cured resin composite. Int J Prosthodont 2004; 17: 241-246.
6. Luthy H, Filser F, Loeffel O, Schumacher M et al. Strength and reliability of four unit
all-ceramic posterior bridges. Dent Mater 2005; 21: 930-937.
7. May K B, Russell M M, Razzoog M E, Lang B R. Precision of fit: the Procera
AllCeram crown. J Prosthet Dent 1998; 80: 394-404. 45
46. Intresting facts about Zirconia
• Zirconium is the source of the closest mimic of
diamond - Cubic Zirconia (CZ). It is popularly
fashioned as a diamond simulant .
46
Visually discerning a good quality cubic zirconia gem from a
diamond is difficult, and most jewellers will have a thermal
conductivity tester to identify cubic zirconia by its low thermal
conductivity (diamond is a very good thermal conductor).
Today, digital technology controls almost every aspect of our life, and dentistry is no exception to it. The technological changes taking place are truly revolutionizing the way dentistry is practiced and the manner in which laboratories are fabricating restorations. The advent of CAD/CAM has enabled the dentists and laboratories to harness the power of computers to design and fabricate esthetic and durable restorations.
Depending on the location of the components of the CAD/CAM systems, in dentistry three different production concepts are available:
chairside production
laboratory production
centralised fabrication in a production centre.
Depending on the location of the components of the CAD/CAM systems, in dentistry three different production concepts are available: chairside production, laboratory production ,centralised fabrication in a production centre.
Example in the Laboratory Area: Everest Engine (KaVo). Example in the Production Centre: HSC Milling Device (etkon).
The quality of the restoration does not necessarily increase with the number of processing axes. The quality results much more from the result of the digitalisation, data processing and production process.
ZrO2 adopts a monoclinic crystal structure at room temperature and transitions to tetragonal and cubic at higher temperatures. The change of volume caused by the structure transitions from to tetragonal to monoclinic to cubic induces large stresses, causing it to crack upon cooling from high temperatures.[4] When the zirconia is blended with some other oxides, the tetragonal and/or cubic phases are stabilized. Effective dopants include magnesium oxide (MgO), yttrium oxide (Y2O3, yttria), calcium oxide (CaO), and cerium(III) oxide (Ce2O3).
In the case of CAD/ CAM production of objects from white bodies, the subsequent shrinkage of some 20% (linear) must be taken into consideration.
Some systems also process zirconium oxide in HIP (hot isostatic pressed) condition with diamond tools and water cooling.
Hot isostatic pressing (HIP) is a manufacturing process, used to reduce the porosity of metals and increase the density of many ceramic materials. This improves the material's mechanical properties and workability. The HIP process subjects a component to both elevated temperature and isostatic gas pressure in a high pressure containment vessel. The pressurizing gas most widely used is argon. An inert gas is used, so that the material does not chemically react. The chamber is heated, causing the pressure inside the vessel to increase. Many systems use associated gas pumping to achieve the necessary pressure level. Pressure is applied to the material from all directions (hence the term "isostatic"). 15,000 psi (100 MPa) being most common{ range; 7,350 psi (50.7 MPa) and 45,000 psi (310 MPa)}
Reverse bevel preparation making the preparation border hardly detectable by the CAD-software
Sharp and thinly extending edges as well as 90° shoulders in a ceramic restoration can result in a concentration of tension;