X-ray Certification Practice

X-ray Certification Practice A dental assistant may expose radiogrpahs if - ✔✔It is permissible in the state in which he or she is employed The most sensitive cells to ionizing radiation are - ✔✔Reproductive cells Th ...

X-ray Certification Practice A dental assistant may expose radiogrpahs if - ✔✔It is permissible in the state in which he or she is employed The most sensitive cells to ionizing radiation are - ✔✔Reproductive cells The best type of x-ray to penetrate body tissue is - ✔✔Hard rays, short wavelength Before seating the dental patient it is necessary to cover which of the following items with disposable plastic wrap - ✔✔X-ray exposure control panel An exposed x-ray film covered with a plastic barrier envelope is considered to be - ✔✔Contaminated Milliamperage controls - ✔✔Heating of the cathode The dental assistant must utilize which of the following personal protective equipment (PPE) when exposing films? - ✔✔Gloves The lead diaphragm determines the size and shape of the - ✔✔X-ray beam The portion of the target that is struck by electrons is called the - ✔✔Focal spot Proper collimation for the film size and target-film distance will - ✔✔Decrease the radiation received by the patient To increase the penetrating quality on an x-ray beam, the auxiliary must - ✔✔Increase kVp The x-ray at the center of the primary beam is called the - ✔✔Central ray A test for quality control relative to manual processing may be accomplished utilizing a - ✔✔Stepwedge Filtration of the X-ray beam protects the patient by - ✔✔Eliminating weak wavelength X-rays from the X-ray beam Information and instructions for proper disposal of the X-ray processing solutions may be found in the - ✔✔Product material safety data sheet The quality or penetrating power of secondary radiation is - ✔✔Less than that of primary radiation X-ray processing tanks are considered secondary containers and according to OSHA standards must be - ✔✔Labeled The time period between the effects of cumulative radiation and visible tissue is the - ✔✔Latent period The amount of radiation a person receives - ✔✔Is cumulative in the entire body Maximum protection of the patient requires that the X-ray beam passes through a - ✔✔Lead apron A technique used to measure the operators exposure to radiation is - ✔✔For the operator to wear a radiation film badge Accumulated radiation dosage for those who work with radiation may not exceed - ✔✔0-1 rem/week To avoid exposure to secondary radiation, the operator should stand - ✔✔At least 6' from the Xray head The most effective way to reduce gonadal exposure from X-rays is to - ✔✔Use a lead apron After each use, the lead lap apron must be - ✔✔Draped over a support rod unfolded The best technique for reducing the radiation exposure to both patient and operator is the use of - ✔✔Fast film Film speed is determined by the - ✔✔Size of the silver bromide crystals The radiographic film is covered with an emulsion of - ✔✔Silver bromide crystals The raised button on the radiographic aids in - ✔✔Mounting The purpose of the lead foil in the dental film is to - ✔✔Reduce film fogging The detection of interproximal caries is seen best with an - ✔✔Bitewing film Which extraoral film is used to visualize the sinus? - ✔✔Waters film X-ray films should be kept by the dentist along with other records for - ✔✔Indefinitely The best place to store unexposed X-ray film is in a - ✔✔Darkroom The principle used in panoramic radiography is - ✔✔Laminagraphy A material or substance that does NOT stop or absorb X-rays is known as - ✔✔Radiolucent A material or substance that DOES stop or absorb X-rays is known as - ✔✔Radiopaque Radiolucent tissue - ✔✔Pulp chamber Which of these appears radiolucent? - ✔✔Caries What is the name of the diagonal radiopaque line visible at the lower part of the roots of the mandibular molars? - ✔✔Internal oblique line What is the small circular radiolucency near the roots of the mandibular premolars called? - ✔✔Mental foramen What term describes the u-shaped radiopaque structure often seen in maxillary molar films? - ✔✔Coronoid process What is the thin radiopaque band between the maxillary incisors called? - ✔✔Nasal septum What term describes the heavily radiopaque midpoint of the mandible? - ✔✔Symphysis What is the small circular radiolucency below the mandibular incisor roots called? - ✔✔Lingual foramen What is the large radiolucent area shown on maxillary molar radiographics called? - ✔✔Maxillary sinus What is the long, narrow and radiolucent area visible below the roots of the mandibular molars called? - ✔✔Mandibular canal What is the radiopaque circular area below the apices of the mandibular incisors called? - ✔✔Genial tubercles What is the basic principle of the bisecting the angle technique? - ✔✔The central ray must be directed at right angles to an imaginary line that bisects the angle formed by the long axis of the tooth and the plane of the film All of the following are basic principles of the paralleling technique EXCEPT - ✔✔An 8" short cone must be used When taking a full mouth series of intraoral X-rays, position the patient so the occlusal plane of the jaw is - ✔✔Parallel to the floor The ala-tragus line is parallel to the floor when taking - ✔✔Extra oral films only The occlusal plane of the maxillary arch being radiographed should be - ✔✔Parallel to the floor Vertical angulation in the bisecting technique for the same radiograph can differ in patients because of - ✔✔Anatomic differences Periapical films should extend beyond the occlusal plane - ✔✔1/8" Firm placement of the film will help prevent - ✔✔Gagging A latent image is - ✔✔Composed of energized silver halide crystals Cone cutting results from the central ray - ✔✔Not being aimed at the center of the film Black lines across the film may be the result of - ✔✔Excessive bending Blurred films can result from - ✔✔Movement of the patient If a patient is reluctant to be radiographed, the assistant should - ✔✔Explain the procedure throughly to the patient Exposure of a radiograph on a child - ✔✔Requires less time than than on an adult Intensifying screens - ✔✔Decrease exposure time of extraoral films As the target - film distance is increased, there is - ✔✔Less distortion A panoramic film that exhibits distortion in the molar region and is lighter on one side of the film only indicates that - ✔✔The patients chin was not positioned properly The usual number of films in a complete dentulous radiograph survey is - ✔✔18-20 In the paralleling technique, a device used to hold the film in the patient's mouth is - ✔✔A film holder Extraoral films are - ✔✔More sensitive to light than intraoral films If the mA is increased while the kVp and the exposure time are kept constant, the resulting films will - ✔✔Be darker Elongation is caused by - ✔✔Insufficient vertical angulation Foreshortening is caused by - ✔✔Too much vertical angulation If a film is exposed on the wrong side, the result will be - ✔✔A herringbone pattern After a film is exposed, the target-film distance is doubled. The exposure time necessary to obtain a second film of equal density to the first film is - ✔✔Fourfold Which of the following is used to describe the blackness of an exposed radiograph? - ✔✔Density The difference in density of various regions of the radiograph is called - ✔✔Contrast For maximum penetration of X-rays, which of the following combinations would you select? - ✔✔90kVP and 10mA Appropriate infection control procedures during X-ray exposure should include - ✔✔Placement of a disposable wrap over the X-ray tube head Radiographs of endentulous portions of a patients mouth - ✔✔Should be exposed routinely Films left overnight in the fixer - ✔✔Will not be affected During processing, when can radiographs safely be exposed to light? - ✔✔After being placed in the fixer Film fog can occur if there is - ✔✔A light leak in the darkroom Film is washed after removing it from the developing solution to - ✔✔Stop the developing process The fixing solution is - ✔✔Acidic Two films are developed for the same length of time but at different temperatures. The film developed at the higher temperature will be - ✔✔Darker If an unexposed film is processed, it will appear - ✔✔Clear Fixing the film - ✔✔Removes the unexposed silver halide crystals from the film emulsion The temperature of the radiographic processing solutions is adjusted by - ✔✔A temperature adjustment waterbath If a properly processed film is left overnight in the water, it will be - ✔✔Unchanged With manual processing, after the films are removed from the fixer, they are washed for - ✔✔20- 30 mins For the developing chemicals to work, the solution must be - ✔✔Basic A processed film reveals small white spots, indicating incomplete development. The error on the film during the processing was caused by - ✔✔Films coming in contact with fixing solution before the proper processing procedure Reticulation is - ✔✔Cracking of the film emulsion The best way to dry processed film manually is to - ✔✔Hang film racks in the darkroom carefully so as not to allow wet films to contact each other Films not fixed for a long enough period of time will appear - ✔✔To have brown tint The chemicals used in processing solutions are dissolved in - ✔✔Distilled water The strength of the safelight permitted in the darkroom depends on the - ✔✔Sensitivity of the film How often should the processing solution be changed? - ✔✔Each week The optimum time-temperature relationship for processing dental radiographs is - ✔✔68 degrees for 4 and a half minutes