Dental Asst. Test Part II
Card Set Information
Dental Asst. Test Part II
How would you test the darkroom for white light leaks?
Use masking tape
What test should be used to evaluate the adequacy of the darkroom safelight?
List three anatomic structures that may require modification of film placement procedures.
Tongue tied, Tori, High Muscle Attach.
What two intraoral radiographic procedures can be used to localize an object in all three dimensions of space?
1) The anterior & postier location of the object
2) Superior- inferior location of an object
Define "latent period" as it relates to radiation biologic effects.
the time between exposure to radiation & the time the biological effects become visible
List at least six factors that will influence radiation effects.
Type, total dose, penetrating ability, acute exposure, while body exposure, ability to repair damage
List seven radiobiologically "critical" organs and the effects that they are known to develop.
Thyroid Gland Cancer
Blood Form Organs-Leukemia
Dental radiographic procedures expose a _____ area of the patient's face.
List 4-5 examples of "somatic" tissues.
List two types of "radioresistant" tissues.
List four types of tissues that are "intermediate" in radiation sensitivity.
Define the term radiosensitive and radioresistant.
Some tissues are very sensitive to radiation.
Give two examples of a stochastic radiation effect.
Give two examples of a nonstochastic/ deterministic effect.
List two examples of genetic/ reproductive tissues .
Exposure of genetic tissues causes _____.
Define in your own words the maximum permissible dose (MPD) concept of radiation protection.
Will not produce any effect
What is the MPD for an occupationally exposed person?
What is the MPD for a non-occupationally exposed person?
What is the MPD for a pregnant occupationally exposed person?
What is the ALARA concept of radiation protection. How does it differ from the MPD?
Does not specify a specific level
A persons' daily exposure to background radiation will be about ____uSv.
The National Council on Radiation Protection limits total lifetime occupational exposure to a formula: 10 mSv X workers age in years. This occupational limit is called ______.
Individual Lifetime Effective Dose
What is background radiation? How much do we receive each year in mSv?
The average somatic dose per "D" speed periapical radiograph is about ___ mSv/film.
Digital imaging requires ____ less radiation than a conventional "D speed" radiograph.
What is the risk of dental radiographs causing skin cancer, cataracts, sterility, thyroid cancer, birth defects?
Leaded thyroid collars will reduce thyroid gland exposures by about ___%.
Leaded aprons will reduce ____ radiation to the reproductive organs (gonads) by about ___%.
Leaded thyroid collars and leaded aprons DO NOT reduce the amount of radiation exposing the ___.
X-ray units with _______ timers are recommended because they __________.
produce short exposure
Film holding devices prevent exposure to the patient's _____.
Compare the differences in the image quality of a panoramic radiograph with an intraoral periapical radiograph.
Significant less detail than a PA
How does the film used in panoramic radiography differ from the one used in intraoral radiography?
The intraoral has to be motionless
What is a supplementary radiographic technique?
to provide diagnostic radiographic info
List the two types of occlusal radiographic techniques.
Name two radiographic localization procedures.
Shift Shot Principle
Right Angle Principle
A radiographic localization procedure requiring the use of a periapical radiograph AND a cross-section occusal radiograph is called the _____.
A radiographic localization procedure requiring the use of TWO periapical radiographs taken at different angles is called the _______.
Shift Shot Clark
What occlusal radiographic technique requires that the central ray be directed perpendicular to the bisector of the angle formed by the long axis of the tooth and the film plane?
The radiographic localization technique most commonly used to locate the buccal-lingual position of an object in the mandible is the _____ technique.
The radiographic localization technique most commonly used to locate the buccal-lingual position in the maxilla is the _____ technique.
What is the primary purpose of an occusal radiograph?
location of foreign bodies pathology
Why would your dentist ask you to take a radiograph using the "Miller's"/Right-angle technique?
to locate a buccal-lingual position of impacted teeth