20 Questions
What method is used for capturing images in digital radiography?
Solid-state sensor using CCD
Which technology uses exposures 50% to 80% less than conventional film?
Digital Computed Radiography (CR)
What is the purpose of scanning the plate with a laser beam of near-red wavelengths in digital radiography?
To form a digital image
What component is still needed in every digital radiography system?
X-ray Source
What type of sensors use an active pixel technology to reduce required system power by a factor of 100?
CMOS sensors
Who discovered X-rays in 1895?
Wilhelm Conrad Röentgen
What did Wilhelm Conrad Röentgen initially observe glowing in a darkened room?
Electrical screens
Who is credited with the first practical use of radiographs in dentistry?
Dr. C. Edmund Kells
What was the first radiograph of the human body?
The outline of Wilhelm Conrad Röentgen's wife's bones
Who produced the first recorded dental radiograph by exposing a photographic plate in his own mouth?
Otto Walkoff
What is the main limitation of systems with a field of view in the form of a cone?
They cannot collect information from hidden surfaces
Which digital format is most commonly used in video technology scanners for describing a succession of triangulated surfaces?
STL (standard tessellation language)
What contrast medium is required for the CEREC Bluecam intraoral camera?
Titanium dioxide powder
Which scanner is an evolution of CEREC Bluecam and incorporates videophotometry technology?
CEREC omnicam
What does the CEREC primescan focus mainly on producing as a chairside system?
Inlays, partial and total crowns
What is the first step of the digital workflow in dentistry?
Acquiring a 3D file digitalizing the area of interest from the patient’s mouth
What is the gold standard method for obtaining a reference model in dentistry?
Using a Coordinate Measurement Machine (CMM)
What is the composition of an Intraoral Scanner (IOS) in dentistry?
Handheld intraoral camera plus a computer and software
What are the two types of Intraoral Scanners (IOS)?
Photographic technology and Video technology
Which procedure can be performed directly as part of the digital workflow in dentistry?
Using intraoral scanners for direct digitalization
Study Notes
Digital Radiography
- Digital radiography captures images using digital sensors that convert X-rays into electrical signals.
- Digital radiography technology uses exposures 50% to 80% less than conventional film.
Digital Radiography Process
- A laser beam of near-red wavelengths is used to scan the plate in digital radiography to capture the latent image.
- A computer is still needed in every digital radiography system to process the image.
Sensors
- Active pixel sensors use an active pixel technology to reduce required system power by a factor of 100.
- Active pixel sensors are used in digital radiography.
History of X-rays
- Wilhelm Conrad Röentgen discovered X-rays in 1895.
- Wilhelm Conrad Röentgen initially observed a glowing fluorescent screen in a darkened room.
- Edmund Kells is credited with the first practical use of radiographs in dentistry.
- The first radiograph of the human body was taken by Wilhelm Conrad Röentgen.
- Dr. Otto Walkhoff produced the first recorded dental radiograph by exposing a photographic plate in his own mouth.
Digital Imaging in Dentistry
- The main limitation of systems with a field of view in the form of a cone is that they can only capture a limited area.
- The digital format STL (STereoLithography) is commonly used in video technology scanners for describing a succession of triangulated surfaces.
Intraoral Camera Systems
- The CEREC Bluecam intraoral camera requires a powder contrast medium.
- The CEREC Omnicam is an evolution of CEREC Bluecam and incorporates videophotometry technology.
- The CEREC Primescan focuses mainly on producing restorations as a chairside system.
Digital Workflow in Dentistry
- The first step of the digital workflow in dentistry is to capture the digital impression.
- The gold standard method for obtaining a reference model in dentistry is to use a physical impression.
- An Intraoral Scanner (IOS) in dentistry consists of a handheld scanner, a computer, and software.
- There are two types of Intraoral Scanners (IOS): active and passive.
- The final restoration can be designed and milled directly as part of the digital workflow in dentistry.
Test your knowledge on the history of X-rays discovery, including the year of discovery, the discoverer, and the subsequent Nobel prize awarded for the discovery.
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