Post on 24-Jun-2015
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OPTICAL IMPRESSIONS
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INDIAN DENTAL ACADEMY
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A JOURNEY TO THE SUCCESSFUL PROSTHESIS STARTS WITH A PERFECT IMPRESSION
INTRODUCTION2
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Definition
IMPRESSION : 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
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Problems faced with conventional impression making
Dentists face problem in daily life
Messy materials
Tedious and time taking
Tongue and saliva
Discomfort to patient
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Eliminating Steps at the Office
Disinfection
Setting of MaterialsTray Selection Dispensing Materials
Shipping
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Eliminating Steps at the Lab
Trimming
Die CuttingBase and Pin
Articulation
Pouring Plaster
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Types
1) intra oral
2) extra oral
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Intra oral advantages
It allows the dental care professional to take the data directly from the prepared tooth and there is no necessity of taking an impression and fabricating a cast
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Dis-advantages
Tongue and saliva may pose some problems
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Extra-oral advantages
An in-vitro study showed a higher accuracy of digitization with impression making and model fabrication than in case of the intraoral digitization
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cercon®eye12
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cercon®eye13
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Contact scanner
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Dis-advantages
1) A cast need to be fabricated so, impression making is must, how ever master cast fabrication is time consuming and error prone method.
2) shadowing effect limits use of extraoral digitization method
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Types of digitization
1) point and click systems
2) scanning
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Point and click systems
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3D cerec
Scanning and designing
3 dimensional viewing Milling 19 www.indiandentalacademy.com
Limitations of CEREC system 1) its scanning technology- point and
click systems 2) its material options-
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Advantages
A single appointment is needed
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Lava Chairside Oral Scanner C.O.S.22
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Advantages of chair side oral scanner It captures a thousands of 3D data sets
in few seconds It captures a motion picture This scanner quickly captures 3D data
and renders a 3D model instantaneously.
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A Clear Difference in Preparation
Powder1 Lava C.O.S. Method
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Accuracy
Quality
Communication
Comfort
AccessibilityProductivity
Potential Benefits for Dentists, Patients and Labs
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Digital Workflows: This is only the beginning…
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Dentist Laboratory 3M ESPE
Workflow for Traditional PFM
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Dentist Laboratory laboratory2
Workflow for Traditional PFM
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Bite Registration and Digital Ditching
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Dentist Laboratory 1 Laboratory 2
Workflow for Traditional PFM
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Dentist Laboratory 1 Laboratory 2
Workflow for Traditional PFM
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Dentist Laboratory 1 Laboratory 2
Workflow for Traditional PFM
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Dentist Laboratory 1 Laboratory 2
Workflow for Traditional PFM
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Dentist Laboratory 1 Laboratory 2
Workflow for LavaTM Zirconia35
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CONCLUSION
These optical impressions are superior in technology and known for its accuracy, saves the patients and dentists time with a few laboratory procedures and patients comfort
but it has limitations like high cost, and specialised equipment requirement
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