Optical modeling of extra oral defects /certified fixed orthodontic courses by Indian dental academy


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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.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call

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Optical modeling of extra oral defects /certified fixed orthodontic courses by Indian dental academy

  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 3dimentional 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. 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
  5. 5. conventional impression materials such as Silicones -Irreversible hydrocolloid have been used in the fabrication of Maxillo facial prosthesis. www.indiandentalacademy.com
  6. 6. Conventional Impression Procedure. www.indiandentalacademy.com
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  8. 8. 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
  9. 9.  The next generation CT & MRI over come the difficulties encountered while using the impression materials. www.indiandentalacademy.com
  10. 10.  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
  11. 11. 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
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  13. 13.  But the only disadvantage is, the patient is exposed to radiation www.indiandentalacademy.com
  14. 14.  This disadvantage is overcome by optical 3dimentional scanner, which uses optical light as the source. www.indiandentalacademy.com
  15. 15.  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
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  17. 17.  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
  18. 18.  The face is illuminated by two grating sequences (grey code combined with four, 90-degree phase-shifted sinusoidal intensities). www.indiandentalacademy.com
  19. 19.  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
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  22. 22.  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
  23. 23.  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
  24. 24.  The body part is exposed to structural light and is recorded optically.  The data is transferred and saved as an argfile. 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
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  28. 28. 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
  29. 29.  3-D model printer used for rapid prototyping to obtain the physical model www.indiandentalacademy.com
  30. 30. Uses of physical model  The pattern of the prosthesis is designed digitally and the accurate physical model is obtained www.indiandentalacademy.com
  31. 31. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com