40 Questions
Why is it necessary for laboratory CAD systems to be open systems?
To ensure compatibility with all types of STL files
What is the primary purpose of using an STL file in laboratory CAD systems?
To store data for construction programs
What type of scanners are intraoral cameras?
Optical scanners
What is the purpose of single image cameras in intraoral scanning?
To record individual images of the dentition
Why are overlapping individual images recorded in intraoral scanning?
To assemble a larger three-dimensional virtual model
What is the advantage of using open laboratory CAD systems?
To ensure compatibility with different STL files
What is the purpose of outsourcing production centers in CAD/CAM technology?
To fabricate models through milling or additive technology
What is the primary advantage of using CAD/CAM technology in dentistry?
To increase the accuracy of digital models
What is the purpose of positioning the camera in different angles?
To ensure accurate recording of data below the height of contour
What happens to the areas not visualized by the camera in the overlapping images?
They are extrapolated by the software program to fill in the missing data areas
Which of the following systems uses video cameras?
True Definition scanner (newest version of the Lava Chairside Oral Scanner, COS), Apollo DI (Sirona) and OmniCam (Sirona)
How does an optical scanner work?
By projecting a measuring light grid onto dental structures under a definite angle
What is the purpose of mechanical scanners?
To read a master cast mechanically line by line
According to Table 2, what is the recommended range for incisal/occlusal reduction?
0.5 mm to 1.5 mm
What happens if the incisal/occlusal reduction is not sufficient?
The restoration will result in fracture
What is the purpose of axial reduction?
To prepare the tooth for CAD/CAM generated restoration
What is the primary function of a data acquisition unit in CAD/CAM systems?
To collect data from the area of the preparation and adjacent structures
Which type of CAD/CAM system has its own scanner and milling units?
Chairside CAD/CAM system
What is the main difference between open and closed CAD/CAM systems?
The ability to share data with other systems
Which of the following is an example of a laboratory CAD/CAM system?
A company with its own scanner and milling units
What is the primary function of the software component in CAD/CAM systems?
To design virtual restorations on a virtual working cast
What is the purpose of an intraoral scanner in CAD/CAM systems?
To collect data from the area of preparation and convert it into virtual impressions
What is the main advantage of using a chairside CAD/CAM system?
Ability to complete the restoration in a single visit
What is an example of an image acquisition system?
A system that has only a scanner without designing capabilities
What is the primary factor that has led to a significant impact on all disciplines of dentistry?
Rapid evolution of CAD/CAM technology
What is the primary goal of integrating CAD/CAM technology with advances in biomaterials?
To predict postoperative clinical treatment and delivery
What is the current trend in prosthodontic care?
A complex integration of sequential techniques involving multiple stakeholders
What is the primary limitation of CAD/CAM technology?
The limited range of restorations that can be developed
What are the three main protocols of CAD/CAM technology?
Digital impressions, digital models, and facebow
What is the primary focus of the study mentioned in the content?
To review the current published literature on CAD/CAM technology
What is the significance of the integration of CAD/CAM technology with advances in biomaterials?
It has altered the entire dental educational landscape
What is the primary advantage of CAD/CAM technology in prosthodontic care?
It enables the prediction of postoperative clinical treatment and delivery
What is the ideal range for the total convergence angle?
Between 48 and 68
Why should sharp line angles on the occluso-axial surface be avoided?
Because the milling bur will remove excessive material
What is the consequence of an over-milled restoration?
Improperly fitting restorations
Why are parallel axial walls contraindicated?
Because they can confuse most scanners and prevent accurate scanning of the preparation
What type of morphology is recommended for the gingival margin?
A rounded shoulder or a deep chamfer
Why are trough or gutter margins contraindicated?
Because they can prevent accurate scanning of the preparation
What is the problem with a 908 internal angle?
It can cause excessive material removal by the milling bur
Why should the morphology of internal line angles be rounded?
Because it prevents excessive material removal by the milling bur
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.
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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