CAD/CAM Technology in Dentistry
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Questions and Answers

Why is it necessary for laboratory CAD systems to be open systems?

  • To restrict access to proprietary data formats
  • To use only optical scanners for image acquisition
  • To limit the use of outsourcing production centers
  • To ensure compatibility with all types of STL files (correct)

    • What is the primary purpose of using an STL file in laboratory CAD systems?

  • To design complex restorations
  • To scan models for outsourcing
  • To store data for construction programs (correct)
  • To create three-dimensional virtual models

    • What type of scanners are intraoral cameras?

  • Laser scanners
  • Optical scanners (correct)
  • Acoustic scanners
  • Digital scanners

    • What is the purpose of single image cameras in intraoral scanning?

    <p>To record individual images of the dentition</p> Signup and view all the answers

    Why are overlapping individual images recorded in intraoral scanning?

    <p>To assemble a larger three-dimensional virtual model</p> Signup and view all the answers

    What is the advantage of using open laboratory CAD systems?

    <p>To ensure compatibility with different STL files</p> Signup and view all the answers

    What is the purpose of outsourcing production centers in CAD/CAM technology?

    <p>To fabricate models through milling or additive technology</p> Signup and view all the answers

    What is the primary advantage of using CAD/CAM technology in dentistry?

    <p>To increase the accuracy of digital models</p> Signup and view all the answers

    What is the purpose of positioning the camera in different angles?

    <p>To ensure accurate recording of data below the height of contour</p> Signup and view all the answers

    What happens to the areas not visualized by the camera in the overlapping images?

    <p>They are extrapolated by the software program to fill in the missing data areas</p> Signup and view all the answers

    Which of the following systems uses video cameras?

    <p>True Definition scanner (newest version of the Lava Chairside Oral Scanner, COS), Apollo DI (Sirona) and OmniCam (Sirona)</p> Signup and view all the answers

    How does an optical scanner work?

    <p>By projecting a measuring light grid onto dental structures under a definite angle</p> Signup and view all the answers

    What is the purpose of mechanical scanners?

    <p>To read a master cast mechanically line by line</p> Signup and view all the answers

    According to Table 2, what is the recommended range for incisal/occlusal reduction?

    <p>0.5 mm to 1.5 mm</p> Signup and view all the answers

    What happens if the incisal/occlusal reduction is not sufficient?

    <p>The restoration will result in fracture</p> Signup and view all the answers

    What is the purpose of axial reduction?

    <p>To prepare the tooth for CAD/CAM generated restoration</p> Signup and view all the answers

    What is the primary function of a data acquisition unit in CAD/CAM systems?

    <p>To collect data from the area of the preparation and adjacent structures</p> Signup and view all the answers

    Which type of CAD/CAM system has its own scanner and milling units?

    <p>Chairside CAD/CAM system</p> Signup and view all the answers

    What is the main difference between open and closed CAD/CAM systems?

    <p>The ability to share data with other systems</p> Signup and view all the answers

    Which of the following is an example of a laboratory CAD/CAM system?

    <p>A company with its own scanner and milling units</p> Signup and view all the answers

    What is the primary function of the software component in CAD/CAM systems?

    <p>To design virtual restorations on a virtual working cast</p> Signup and view all the answers

    What is the purpose of an intraoral scanner in CAD/CAM systems?

    <p>To collect data from the area of preparation and convert it into virtual impressions</p> Signup and view all the answers

    What is the main advantage of using a chairside CAD/CAM system?

    <p>Ability to complete the restoration in a single visit</p> Signup and view all the answers

    What is an example of an image acquisition system?

    <p>A system that has only a scanner without designing capabilities</p> Signup and view all the answers

    What is the primary factor that has led to a significant impact on all disciplines of dentistry?

    <p>Rapid evolution of CAD/CAM technology</p> Signup and view all the answers

    What is the primary goal of integrating CAD/CAM technology with advances in biomaterials?

    <p>To predict postoperative clinical treatment and delivery</p> Signup and view all the answers

    What is the current trend in prosthodontic care?

    <p>A complex integration of sequential techniques involving multiple stakeholders</p> Signup and view all the answers

    What is the primary limitation of CAD/CAM technology?

    <p>The limited range of restorations that can be developed</p> Signup and view all the answers

    What are the three main protocols of CAD/CAM technology?

    <p>Digital impressions, digital models, and facebow</p> Signup and view all the answers

    What is the primary focus of the study mentioned in the content?

    <p>To review the current published literature on CAD/CAM technology</p> Signup and view all the answers

    What is the significance of the integration of CAD/CAM technology with advances in biomaterials?

    <p>It has altered the entire dental educational landscape</p> Signup and view all the answers

    What is the primary advantage of CAD/CAM technology in prosthodontic care?

    <p>It enables the prediction of postoperative clinical treatment and delivery</p> Signup and view all the answers

    What is the ideal range for the total convergence angle?

    <p>Between 48 and 68</p> Signup and view all the answers

    Why should sharp line angles on the occluso-axial surface be avoided?

    <p>Because the milling bur will remove excessive material</p> Signup and view all the answers

    What is the consequence of an over-milled restoration?

    <p>Improperly fitting restorations</p> Signup and view all the answers

    Why are parallel axial walls contraindicated?

    <p>Because they can confuse most scanners and prevent accurate scanning of the preparation</p> Signup and view all the answers

    What type of morphology is recommended for the gingival margin?

    <p>A rounded shoulder or a deep chamfer</p> Signup and view all the answers

    Why are trough or gutter margins contraindicated?

    <p>Because they can prevent accurate scanning of the preparation</p> Signup and view all the answers

    What is the problem with a 908 internal angle?

    <p>It can cause excessive material removal by the milling bur</p> Signup and view all the answers

    Why should the morphology of internal line angles be rounded?

    <p>Because it prevents excessive material removal by the milling bur</p> Signup and view all the answers

    Study Notes

    Impact of CAD/CAM Technology on Dentistry

    • CAD/CAM technology has dramatically impacted all disciplines of dentistry, especially prosthodontics and restorative dentistry.
    • The integration of CAD/CAM technology with advances in biomaterials has led to significant changes in education and patient care.

    CAD/CAM Components

    • A CAD/CAM system consists of three major parts: data acquisition unit, software for designing virtual restorations, and a computerized milling device.

    Classification of CAD/CAM Systems

    • Laboratory systems: classified into laboratory CAD/CAM (scanner and milling units), laboratory CAD (scanner only), and laboratory CAM (milling unit only).
    • Chairside systems: classified into chairside CAD/CAM (scanner and milling units) and image acquisition system (scanner only).

    Classification of Scanners

    • Intraoral scanners: optical scanners, separated into single image cameras and video cameras.
    • Laboratory scanners: classified into optical scanners and mechanical scanners.

    Guidelines for Tooth Preparation for CAD/CAM Generated Restorations

    • Incisal/occlusal reduction: depends on material type and restoration design (0.5 mm to 1.5 mm).
    • Axial reduction: depends on material type and restoration design (0.5 mm to 1.5 mm).
    • Total convergence angle: should be between 48 and 68 degrees.
    • Morphology of internal line angle: should be rounded to avoid confusing scanners and prevent inaccurate scanning.
    • Morphology of gingival margin: should be either a rounded shoulder or a deep chamfer to prevent inaccurate scanning.

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    Description

    Explore the impact of CAD/CAM technology on dentistry, particularly in prosthodontics and restorative dentistry. Learn how it has changed education and patient care.

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