Chapter 22/23 TB/WB Questions + Chapter 9 DT

Which error results in interproximal spaces overlapping on a radiograph?

horizontal angulation

When processing film in an automatic processor, what is the sequence of the solutions?

developer, fixer, water

What is the optimal temperature for processing x-rays in the automatic processor?

85-95°F

When viewing properly mounted x-rays, where or how is the dot on the film mounted?

so that it is raised or convex (pimple, no dimple.)

The entire tooth and surrounding area are seen on the…?

periapical x-ray

Which one of the two exposure techniques listed below uses a vertical angulation table for proper positioning of the cone?

bisecting technique

Occlusal radiographs are used to locate or define all of the following except…

a facial view of entire mandibular arch

A full-mouth survey of a child aged 3-5 years includes…

two bite-wings, six anterior periapical, and eight posterior periapical radiographs.

What is one of the exposure errors in radiology?

torn or scratched film.

Duplicating film in the same film used to expose x-rays of the teeth. T or F

false

Panoramic & occlusal radiographs are considered…

extraoral film

A cassette is used to…

hold the film for extraoral radiographic exposures.

The ________ is the type of extraoral film primarily used by orthodontists.

cephalometric radiographic

panoramic exposure techniques…

• remove bulky sweaters, coats, and hair clips that may interfere with the rotation of the x-ray tube head

• The patient should always wear a lead apron without thyroid collar

• the patient is positioned in the chin rest, biting on a bite block, with the head properly positioned for the film exposure

Dental Assistants are allowed to diagnose dental disease by interpreting x-rays. T or F

False

What can test quality assurance that evaluates the dark room for possible light leaks?

placing a coin on unexposed film

How often should the quality assurance test be run?

monthly

What technique is used mainly for diagnosis of temporomandibular joint disease?

MRI (Magnetic Resonance Imaging)

_______ allows the dentist and/or dental staff to take x-rays and the display the image on a computer monitor.

digital imaging

Both intraoral & extraoral radiographs can be taken with digital imaging. T or F

True

Extraoral radiographs are used by the dentist to identify…

• large areas of the skull on a single radiograph

• Both maxillary & mandibular areas at the same time

• conditions or artifacts that are not otherwise diagnosed in other ways

Panoramic radiographs may be taken of

patients who have trisma, in wheelchairs, and edentulous patients

what are some extraoral radiographs?

• panoramic

• cephalometric

• transcranial temporomandibular joint

What can cause ghost imaging?

• earrings

• eyeglasses

• facial piercings

The cephalometric radiograph records…

• sinuses

• implant evaluation

• TMJ assessment

The cephalometric unit consists of…

• cephalometric

• head-holding device

• cassette holder

The line from the tragus of the ear to the floor of the orbit is also called the…

frankfort plane

An x-ray is made up of light gray to white shades. What interprets the radiograph?

radiopaque

The _______ would be included in a service log on quality assurance.

dates of test, types of test performed, service work.

White light leaks in the dark room can be checked by a coin test. How often should this test performed?

once a month

The controlling factor in the production of electrons available for radiographs is…

kilovolt power

Aluminum disks placed between the collimator and the tube window to remove weak radiation are…

filters

The tube head area where the central beam or primary ray is projected is the…

focal spot

The positive pole in the tube head that serves as a target for electron barrage is the…

anode

The abbreviation for the term “milliampere” is…

mA

The central ray or beam of radiation emitting from the tube head or PID is…

primary radiation

The time or duration of the interval when the current will pass through the x-ray tube is the…

exposure time

The distance between the arode target and the object to be radiographed is called the…

target-object distance

Cumulative effect is the…

effect of continual exposure to radiation

The color of a Rinn positioning device used for endodontic work is…

green

The ability of x-rays to penetrate and possible ionize body tissues is called

sensitivity

Radiation overdose that causes temporary redness of the skin is…

erythema dose

Which type of film would be used to view the tooth crown, roots, and surrounding tissues…

periapical

Another term for a bite-wing exposure is…

interproximal

A size 4 radiograph packet would contain which film?

occlusal

What are basic safety precautions in exposure of radiographs?

• dosimeter

• lead apron/thyrocervical collar

• lead barrier or screen

What radiographic film is particularly used in orthodontics?

cephalometric

Variations of black and white colors on a radiograph are considered an example of…

contrast.

Another name for the paralleling technique for radiographic exposures is…

right-angle technique.

If the PID is aimed in an upward position, it is considered to be which angulation?

negative

X-rays, also known as Roentgen rays, are a source of _________ energy.

radiant

A _________ is a device to regulate the x-ray beam exiting from the tube head.

collimator

The tungsten coil in the cathode-focusing cup that generates the electrons is called the ___________.

filament

Another word for 1,000 volts is a _________.

kilovolt

Radiation that leaks from a faulty tube head is called __________ radiation.

stray

Abnormal growth or development in which radiation causes genetic changes is called the ___________ effect.

mutation

A digital radiographic image obtained from the CCP sensor and immediately incorporated in the work station is considered to be a _______ acquired image.

direct

An _________ film is used to expose large areas in the oral cavity.

occlusal

A lead apron with thyrocervical collar is considered protection for the ____________.

thyroid glands

Another word for a bite-wing packet is an __________ x-ray film.

interproximal

Radiographs exposed outside the oral cavity are called _________ films.

extraoral

A special rotating radiograph producing the entire dentition and surrounding structures and exposed outside the oral cavity is called a __________ radiograph.

panoramic

A substance that resists radiation penetration and produces a light area on the exposed film is said to be _________.

radiopaque.

The imaginary line down the middle of the face, bisecting the head into the right and left is called the _________ plane.

sagittal

An error in the horizontal angulation during exposure may cause cone cutting and ___________.

overlapping.

An error in vertical angulation during exposure may cause foreshortening or ____________.

elongation.

Placing the film in the oral cavity in a backward position may cause an error and termed the __________ effect.

herringbone

Extreme changes in temperature of processing solutions used in the procedure may produce a crackle film surface appearance called ___________.

reticulation

Improper storage, handling, or overdue or expired solutions may produce processed films with a cloudy appearance, called ______.

fog

Poor definition or fuzzy outline of form caused by movement known as ___________.

penumbra.

cephalometric

pertaining to the head.

ala tragus line

imaginary line from the ala of the nose to the tragus of the ear, used in radiographic positioning.

radiopaque

portion of the radiograph that shows light.

edentulous survey

without teeth

elongation

radiographic placement error resulting in an extended length of the tooth image.