OPTICAL MODELING
OF EXTRA ORAL
DEFECTS.
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacadem...
Introduction.
 The combination of medical imaging and
rapid prototyping is a fast expanding field with
a large applicatio...
 This presentation highlights about recent
imaging technology and its application in the
field of maxillofacial prosthesi...
www.indiandentalacademy.com
Steps in the fabrication of
Maxillo facial prosthesis.
 1) Impression making.
 2) Preparing a physical model
 3) Fabric...
conventional impression materials such as
Silicones
-Irreversible hydrocolloid
have been used in the fabrication of Maxill...
Conventional Impression
Procedure.
www.indiandentalacademy.com
www.indiandentalacademy.com
Disadvantages of using the
impression materials
 -Discomfort to the patient.
 -Testing the ability of the clinician.
 -...
 The next generation CT & MRI over come the
difficulties encountered while using the
impression materials.
www.indiandent...
 CT & MRI scan the defective area & a CAD
model of the defective area is reproduced,
from which a CAD model of the prosth...
CT SCAN
 Computed Tomography is based on the x-ray
principal:
 x-rays pass through the body they are
absorbed or attenua...
www.indiandentalacademy.com
 But the only disadvantage is, the patient is
exposed to radiation
www.indiandentalacademy.com
 This disadvantage is overcome by optical 3-
dimentional scanner, which uses optical light
as the source.
www.indiandenta...
 The optical 3-dimentional scanner is a newer
device used to scan the facial defects and
reproduce a CAD model which is u...
www.indiandentalacademy.com
 It is a mobile, multiview 3-D measuring
system based on self-calibrating fringe
projection technology
 It facilitates t...
 The face is illuminated by two grating
sequences (grey code combined with four,
90-degree phase-shifted sinusoidal
inten...
 The observing cameras capture these fringe
pictures simultaneously, resulting in at least 4
phase values for each pixel ...
www.indiandentalacademy.com
www.indiandentalacademy.com
 Optimum measurements of an extraoral
defect involves 4 cameras and 5 projection
directions.
 Using this technique, the ...
 The duration time of recording up to the 3-D
point cloud is approximately 20 seconds.
 The measuring accuracy as by the...
 The body part is exposed to structural light
and is recorded optically.
 The data is transferred and saved as an arg-
f...
www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
RAPID PROTOTYPING
 The generated CAD model is converted into
a physical model by means of a rapid
prototyping procedure u...
 3-D model printer used
for rapid prototyping to
obtain the physical
model
www.indiandentalacademy.com
Uses of physical model
 The pattern of the prosthesis is designed
digitally and the accurate physical model is
obtained
w...
www.indiandentalacademy.com
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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.

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Optical modeling of extra oral defects/ dentistry jobs

  1. 1. OPTICAL MODELING OF EXTRA ORAL DEFECTS. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. Introduction.  The combination of medical imaging and rapid prototyping is a fast expanding field with a large application potential in medicine and related fields.  Typical applications include the making of 3- dimentional copies of anatomical structures, the production of individually designed prosthesis models and the replication of anatomical objects for educational purposes. www.indiandentalacademy.com
  3. 3.  This presentation highlights about recent imaging technology and its application in the field of maxillofacial prosthesis. www.indiandentalacademy.com
  4. 4. www.indiandentalacademy.com
  5. 5. Steps in the fabrication of Maxillo facial prosthesis.  1) Impression making.  2) Preparing a physical model  3) Fabricating a prosthesis pattern.  4) Final prosthesis. www.indiandentalacademy.com
  6. 6. conventional impression materials such as Silicones -Irreversible hydrocolloid have been used in the fabrication of Maxillo facial prosthesis. www.indiandentalacademy.com
  7. 7. Conventional Impression Procedure. www.indiandentalacademy.com
  8. 8. www.indiandentalacademy.com
  9. 9. Disadvantages of using the impression materials  -Discomfort to the patient.  -Testing the ability of the clinician.  -Structural variability of the material leads to inaccuracies of the fitting of the prosthesis. www.indiandentalacademy.com
  10. 10.  The next generation CT & MRI over come the difficulties encountered while using the impression materials. www.indiandentalacademy.com
  11. 11.  CT & MRI scan the defective area & a CAD model of the defective area is reproduced, from which a CAD model of the prosthesis pattern is designed & we get the prosthesis pattern by a procedure known as rapid prototyping. www.indiandentalacademy.com
  12. 12. CT SCAN  Computed Tomography is based on the x-ray principal:  x-rays pass through the body they are absorbed or attenuated (weakened) at differing levels creating a matrix or profile of x-ray beams of different strength.  This x-ray profile is registered on film, thus creating an image.  In the case of CT, the film is replaced by a detector which measures the x-ray profile. www.indiandentalacademy.com
  13. 13. www.indiandentalacademy.com
  14. 14.  But the only disadvantage is, the patient is exposed to radiation www.indiandentalacademy.com
  15. 15.  This disadvantage is overcome by optical 3- dimentional scanner, which uses optical light as the source. www.indiandentalacademy.com
  16. 16.  The optical 3-dimentional scanner is a newer device used to scan the facial defects and reproduce a CAD model which is used in the fabrication of Maxillo facial prosthesis. www.indiandentalacademy.com
  17. 17. www.indiandentalacademy.com
  18. 18.  It is a mobile, multiview 3-D measuring system based on self-calibrating fringe projection technology  It facilitates the fully automatic recording of the body part from various direction in one measuring process  The maximum field diameter of the system is 650 mm. Therefore, the complete human face can be recorded in a single operation. www.indiandentalacademy.com
  19. 19.  The face is illuminated by two grating sequences (grey code combined with four, 90-degree phase-shifted sinusoidal intensities). www.indiandentalacademy.com
  20. 20.  The observing cameras capture these fringe pictures simultaneously, resulting in at least 4 phase values for each pixel of the camera.  Using these phase values, the 3-D coordinates are calculated.  In the “kolibri-mobile” system, the object is illuminated from different directions by means of a network of fixed mirror.(M1, M2, M3, M4, M5)  The switching of the projection direction is done by the rotating central mirror M1. www.indiandentalacademy.com
  21. 21. www.indiandentalacademy.com
  22. 22. www.indiandentalacademy.com
  23. 23.  Optimum measurements of an extraoral defect involves 4 cameras and 5 projection directions.  Using this technique, the whole body view is obtained automatically without any additional software manipulations. www.indiandentalacademy.com
  24. 24.  The duration time of recording up to the 3-D point cloud is approximately 20 seconds.  The measuring accuracy as by the manufacturer to be less than 100um. www.indiandentalacademy.com
  25. 25.  The body part is exposed to structural light and is recorded optically.  The data is transferred and saved as an arg- file. These data is changed into ASC2 format on the computer.  Process the data with software (SURFACER, version 10.5).  And a CAD model is generated. www.indiandentalacademy.com
  26. 26. www.indiandentalacademy.com
  27. 27. www.indiandentalacademy.com
  28. 28. www.indiandentalacademy.com
  29. 29. RAPID PROTOTYPING  The generated CAD model is converted into a physical model by means of a rapid prototyping procedure using a 3-D model printer. www.indiandentalacademy.com
  30. 30.  3-D model printer used for rapid prototyping to obtain the physical model www.indiandentalacademy.com
  31. 31. Uses of physical model  The pattern of the prosthesis is designed digitally and the accurate physical model is obtained www.indiandentalacademy.com
  32. 32. www.indiandentalacademy.com

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