Cad Cam dentistry and digital impressions
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Transcript of Cad Cam dentistry and digital impressions
CAD CAM Dentistry and
Digital Impression
Greetings from AECS Maaruti College of Dental
SciencesBangalore
Dentistry v/s CAD CAM Dentistry
“Lemon”
Dr. Werner Mörmann, Dr. Marco Brandestini, Dr. Alain Ferru
Applications of CAD CAM dentistry
ImpressionA negative likeness or copy in reverse of the surface of an object ; imprint of teeth and adjacent structures for use in dentistry. GPT – 8
Conventional v/s Digital• The digital impression cuts down turnaround time
• more comfortable for the patient
• gives more accurate fit and remakes are fewer
• improves dentist/lab communication
• gives a competitive advantage
Year, first author Test variability Conclusion
2014, Svanborg etal Marginal fit, Digital and conventional impression
The digital impression is more accurate and can generate a 3unit FDPs with significantly closer fit than VPS impression
2014, Yuzbasigolu etal
Patient comfort, effectiveness, clinical outcome
The digital impression is time effective and patient prefer digital impression method than the traditional one.
2014, Ender etal Accuracy of digital and conventional impression
The digital impression showed excellent clinical results within their indications and applying the right technique of scanning
2013, Lee etal Digital impression perception of student and clinician
The digital impression was most effective technique and students find difficulty in conducting traditional technique.
2012, Galhano etal Optical impression methods
The digital impression was speed, effective and less invasive than traditional methods.
2010,Poticny etal Predictability and esthetic out comes
The digital impression allows immediate evaluation of preparations and margins
Digital Impression
Basic components of CAD CAM involves:1. Digitalized Scanner
• Optical Scanner• Mechanical scanner
2. Design Software
3. Processing Device or Computer numeric control machine
“ Could cavities be scanned by ultrasound ? ”
Optical Scanner• Based on the principle of triangulation• The light source and the receptor unit are in a
definite angulation in relation to each other
Eg: Everest scan, Lava Scan, es1
Mechanical Scanner• The master cast is read mechanically line by line
by means of a ruby ball• The 3D structure is measured Eg: Procera scanner
Open v/s. Closed Architecture
Based on data files created :• Open-architecture files, typically termed STL files,
are not dependent on the manufacturer, and can be used virtually in any design software to fabricate a final restoration
• Closed-system software architecture collects and manipulates data modules by the same manufacturer, offering laboratory owners security and a one-stop for resolving problems
Based on the location of processing unit
• Chairside Production
• Laboratory Production
• Centralised fabrication in production
centre
Chairside digital impression systems with laboratory transfer capability
i-Tero Lava C.O.S CEREC AC
Features Candent i-Tero 3M Lava C.O.S Sirona CEREC AC
Optical technology
Parallel confocal / telecentric
Wavefront Sampling technology
LED / Laser sampling
Powder requirement
No Yes Yes (optispray)
Models Milled PU, removable dies, soft tissue profile
Additive / SLA blue resin one solid model & one working model
Additive / SLA; no tissue
Digital interface
Open Closed ( LAVA) Closed(CEREC In-Lab)
Articulators
All movements, attachment to Whipmix
full articulator for complex cases
Articulated;Centric and lateral
excursionsHinge only
Indications All Upto 4UB and singles
All
Recent Advances
Features CEREC Omnicam CEREC Bluecam
Imaging technique Continuous color imagingContinuous data acquisition
generates a 3D model
Single image acquisition
A few images are combined to create a 3Dmodel
Patient counseling mode
Yes -
3D scans in color Yes -
Powder usage - Yes
Area of application
Single tooth, quadrant, full mouth
Single tooth, quadrant (full mouth possible)
Advantages• Unrivalled handling• Powder free scanning• Precise 3D images in
natural color
• High precision• Ease of operation• Rapid acquisition of power-
coated surfaces
Clinic and laboratory relationship
• Adopting CAD/CAM technology into a practice, even at the highest level, does not have to mean an end to the doctor-laboratory relationship
• The integration of digital scanning technology can save time and reduce remake rates for the laboratory.
• Digital scanning and digital photography both offer the ability to convey accurate digital information between the clinician and the laboratory technician and vice versa
References• Mörmann WH, The evolution of the CEREC
systemJADA 2006;137(9 supplement):7S-13S.
• Abduo J, Lyons K, Bennamoun M, Trends in Computer-Aided Manufacturing in Prosthodontics: A Review of the available streams, International Journal of Dentistry Volume 2014, Article ID 783948, 15 pages
• Prajapati A etal, Dentistry Goes Digital: A Cad-Cam Way- A Review Article IOSR-JDMS.Vol13, Iss8 Ver. IV (Aug. 2014), PP 53-59
• Coppa A. et al. "Early Neolithic tradition of dentistry: Flint tips were surprisingly effective for drilling tooth enamel in a prehistoric population." Nature. Vol. 440. 6 April 2006.
• Lowe RA. CAD CAM dentistry and digital impression making.
• Baroudi K., and S. N. Ibraheem. "Assessment of Chair-side Computer-Aided Design and Computer-Aided Manufacturing Restorations: A Review of the Literature." Journal of international oral health: JIOH Vol 7 iss.4 (2015): 96-104.
• Harsono M etal. Evolution of Chairside CAD/CAM Dentistry. Inside Dentistry October 2012, Vol 8, Iss 10