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RHS Study Guide 100
RHS Study Guide
| Question | Answer | |||
|---|---|---|---|---|
| A radiograph will automatically be retaken when there is | double exposure | bent plate | cone cut | scratched plate |
| Human tissue is mainly composed of | water/H2O | hydrogen/H | Iron/Fe | Oxygen/02 |
| The amount of radiation and exposure time needed to produce a diagnostic radiograph is best determined by | exposure time | kVp | mA | image receptor size |
| When exposing radiographs, what is the minimum distance the operator should stand from the tube head? | 6 feet | 2 feet | 4 feet | 8 feet |
| The most commonly used radiographic exposure for a 3-year-old patient is a | bitewing | periapical | panoramic | cephalometric |
| Which landmark is useful when mounting images in the maxillary central area? | Anterior nasal spine | genial tubercle | mental foramen | retromolar pad |
| When using a 16-inch PID instead of an 8-inch PID, the exposure time must | be increased | remain the same | be decreased | |
| Dental x-rays should be prescribed when the | benefits outweigh the risk of harm | insurance company will reimburse the cost to the patient | patient arrives for the second of two annual visits | maximum permissible dose is achieved |
| When taking a panoramic radiograph, the patient's head should be oriented | with the midsagittal plane perpendicular to the floor | so that it is rotated toward the image receptor | with the chin tipped up | with the chin projected forward |
| To produce ionizing radiation, an atom must | add an electron | add a proton | lose a neutron | lose a proton |
| After selecting the appropriate sensor size for the patient when taking a digital radiograph, the next step is to | place a barrier on the sensor | sterilize the sensor | attach the wire to the sensor | place the sensor in the mouth |
| On an anterior image, the anterior alveolar crest normally appears | pointed and sharp | as a triangular-shaped radiopacity | flat and smooth | as a dense radiopaque line |
| When placing periapical images in a template, what information helps to distinguish maxillary molar images from mandibular molar images? | The maxillary sinus outline is visible | The mandibular second molar has one root | The maxillary molars have two roots | The mandibular molars are larger |
| The most important step the dentist can take in protecting patients from x-radiation is to | properly use collimation | properly prescribe radiographs | avoid positioning devices | avoid filtration |
| Prevent cross-contamination by wiping the countertop with | an EPA-approved disinfectant | soap and water | bleach solution | alcohol wipes |
| During the exposure of digital radiography, the operator should | Don over-gloves to access additional items from a drawer | Require the patient to wear safety glasses | replace the sensor barrier sleeve after each exposure | remove gloves to push the exposure button |
| The penetrating x-ray beam made during dental radiography is called | primary radiation | secondary radiation | characteristic radiation | scatter radiation |
| The Frankfort Plane is an imaginary plane passing through the | external auditory meatus to the floor of the orbit | ala of the nose to tragus of the ear | ala of the nose to the bottom of the ear | external auditory meatus to the outer canthus of the eye |
| Which landmark is useful when mounting images of the mandibular posterior area? | Mental foramen | External oblique ridge | internal oblique ridge | Lingual foramen |
| Supernumerary teeth are best detected using what type of image receptor? | Panoramic | Bitewing | Cephalometric | Periapical |
| The median palatal suture is visible on which images? | Maxillary anterior periapical | Maxillary posterior periapical | mandibular posterior periapical | Mandibular anterior periapical |
| When exposing a posterior periapical radiograph on an adult patient with no intraoral restrictions, which size image receptor should be used? | 2 | 1 | 3 | 4 |
| To view an abscess on tooth #25, the best radiographic exposure is a/an | periapical | Bitewing | occlusal | panoramic |
| Which critical radiography item should be sterilized after use? | bite tab of xcp holder | sensor | psp plate | PID/cone of the x-ray unit |
| What influences the sharpness of a radiograph? | Focal spot size | kVp and mA | X-ray beam angulation | Object-receptor alignment |
| When documenting a lesion found on an image, the description should include | severity | size | Location | appearance |
| On a full mouth series with eighteen images, how many anterior images are exposed? | 6 | 5 | 7 | 8 |
| If you do not use disposable barriers during a radiographic procedure what should be done to all clinical surfaces? | disinfected | sterilized | wiped down | dried |
| Which pathogen is NOT found in oral or respiratory secretions? | West Nile virus | Flu Virus | Mycobacterium | Hepatitis B virus |
| Which type of radiation is formed by the interaction of x-rays with matter? | secondary radiation | scattered radiation | primary radiation | Bremsstrahlung radiation |
| When should gloves be worn while taking radiographs? | wear when placing receptor into the mouth | do not wear when disinfecting after the procedure | do not wear when putting XCP holder together | wear when putting barriers on x-ray unit |
| Processed PSP plates should be handled by the edges to prevent | scratches | contamination | discoloration | cone cuts |
| Which exposure is used to diagnose interproximal caries? | Bitewing | Periapical | Cephalometric | Panoramic |
| If a patient's chin is positioned too high during a panoramic image, how will the image appear? | the image will appear flat or a 'reverse smile' | anterior teeth will appear thin | anterior teeth will appear wide | the image will appear as an exaggerated smile |
| When should the lead apron and thyroid collar used during radiography be disinfected? | after each use | when visibly soiled | twice daily | once weekly |
| The best way to prevent cross-contamination when using sensors is by | using individual barrier sleeves | disinfection | sterilzation | using an antiseptic rinse agent |
| Which measurement of force refer to the potential difference between two electrical charges? | Voltage | Contrast | Amperage | Density |
| Which PID reduces patient radiation exposure by up to 70 percent when compared to a round position-indicating device? | Rectangular-shaped | Oblong-shape | Closed-end pointed shape | Cone-shaped |
| The shorter the wavelength of electromagnetic radiation, the greater the | Energy | matter | number of atoms | number of electrons |
| If a dental assistant dosimeter badge report indicates exposure to radiation, what should be done first? | Evaluate the x-ray equipment and techniques | consult a physician | repeat the badge test | Chang the mA and kVp or exposure time |
| Personnel radiation monitoring devices are worn to | record the occupational exposure received by the operator | record the background exposure received by the patient | alert the operator when an exposure occurs | alert the patient when an exposure occurs |
| Which three types of radiation protection methods should be used to minimize radiographer exposure? | Barrier, monitoring device, operator position | x-ray type, control, angle of tubehead | location, equipment, mask | chair position, stance, pid |
| Which item best protects the dental team member from cross-contamination while exposing radiographs? | Gloves | Patient bib | Barriers on PID | Sensor positioning devices |
| Added filtration in the x-ray tubehead protects the | Patient | operator | dentist | environment |
| If the surface beneath the barrier is touched, the dental team member must | disinfect the surface with an intermediate-level-disinfectant | dry the surface using clean 2x2 gauze | clean the surface using alcohol wipes | sterilize the surface using a chemical sterilant |
| Which organ is the most sensitive to radiographic exposure? | Thyroid gland | Ear canal | nasal cavity | Parotid gland |
| How do you measure tissue damage from x-ray energy? | Radiation absorbed dose | chemical changes | cell sensitivity | genetic effects |
| Which tissues is the most highly radiosensitive? | Skin | Mature bone | Nerve | Salivary glands |
| Which size image receptor is used for an adult posterior periapical film? | 2 | 0 | 3 | 4 |
| Before exposing dental radiographs on a visually impaired patient, | use touch to explain the equipment and procedure | set the exposure time to increase radiation | set the exposure time to decrease radiation | ask the caregiver to stabilize the image receptor |
| Compared to a dentulous patient, radiographic exposure time on an edentulous adult patient should | decrease | remain unchanged | be doubled | increase |
| After a radiographic procedure, the PID should be | disinfected | exposed | dried | sterilized |
| The most common reason for taking bitewing radiographs is to evaluate | interproximal caries | incipient caries | occlusal caries | calculus |
| Which lesions appear radiopaque? | sclerotic bone | dentigerous cyst | metastatic carcinoma | periapical abscess |
| What causes light-colored radiographs? | underexposure | holding the exposure button too long | excessive kVp | overdevelopment |
| When the contact area of one tooth is superimposed over the contact of another on a radiograph, it is called | overlapping | elongation | foreshortening | cone cutting |
| Compared to radiopaque structures, radiolucent structures | appear dark on an image | appear light on a radiograph | absorb more radiation | are dense |
| Foreshortening of the maxillary radiographic image results from | increased vertical angulation | decreased horizontal angulation | decreased vertical angulation | increased horizontal angulation |
| Paralleling technique requires the image receptor be placed | away from the tooth, toward the middle of the oral cavity | toward the tooth, away from the oral cavity | against the occlusal surface of the tooth | against the lingual surface of the tooth |
| The maximum permissible dose (MPD) of ionizing radiation for occupational exposure is | 5.0 rem per year (0.005 Sv) | 0.05 rem per year (0.0005 Sv) | 1.0 rem per year (0.01 Sv) | 0.5 rem per year (0.05 Sv) |
| The best way to minimize cross-contamination when exposing radiographs is to | touch as few surfaces as possible | dispose of items according to regulations | prepare the room after the patient is seated | wash hands before and after procedures |
| What does Cone beam computed tomography use? | three-dimensional technology | two-dimensional technology | customized image holders | panoramic cassettes. |
| What may cause unnecessary radiation exposure to the patient? | Radiograph technique errors | standard radiographs during exam appointment | standard radiographs during recall appointment | endodontic radiographs |
| Who is most susceptible to radiation damage? | infants | teenagers | seniors citizenz | middle-aged adults |
| Using a lead apron with a thyroid collar during dental radiographs protects the patient from | scatter radiation | the primary beam | infectious agents | hazardous materials |
| Which device is a disposable intraoral PSP holder? | Stabe | Endoray | Rinn XCP | Eezee grip |
| What position-indicating device (PID) shape most effectively reduces patient exposure to radiation? | rectangular | conical | oblong | round |
| Which semicritical item should be sterilized before reuse? | positioning device | Sensor | Lead apron | NONE OF THE ABOVE |
| What is the advantage of using digital radiography? | Reduces the radiation to patient | increases image density | reduces image contrast | increases comfort for the patient |
| What was established to address the education and certification of radiographic equipment operators? | National Council on Consumer-patient Radiation Health and Safety Act | Radiation Control for health and Safety | Radiation Protection and Measurements | International Commission on Radiation Units and Measurements |
| After use, a dental sensor should be | prepared for reuse according to manufacturer instructions | washed with a mild soap and rinsed with sterile water | processed in a dry heat sterilizer | placed into a paper cup and covered with high level disinfectant |
| What prevents x-rays from escaping the tubehead? | lead-glass housing | Cathode | Anode | Tungsten filament |
| A panoramic image appears to have a "reverse smile" when the | Frankfort plane is angled upward | Frankfort plane is angled downward | midsagittal plane is angled to the right | midsagittal plane is angled to the left |
| What is observed on a panoramic radiograph when the patient's chin is tipped down? | Exaggerated smile | Anterior teeth appear widened | Narrow smile | Teeth appear superimposed |
| What radiographic technique is recommended for a patient with a shallow palate? | Bisecting | Periapical | Paralleling | Occlusal |
| What is the most common radiographic exposure used to detect periodontal disease? What is the most common radiographic exposure used to detect periodontal disease | bitewing | panoramic | periapical | occlusal |
| Leakage radiation is any radiation that is | From the primary beam | received from the patient | received from the operator | from the secondary beam |
| What is the primary function of collimation? | restrict the size of the beam | increase target-receptor distance | eliminate cone cuts | decrease target-receptor distance |
| Which of the following item is considered biohazardous waste in a dental office? | Bloody gauze | fixer solution | Tray covers | Bitewing tabs |
| The edentulous radiographic series may include all the following EXCEPT | bitewings | panoramic | occlusals | periapicals |
| If a patient's gag reflex is stimulated during the radiographic procedure, | apply distraction techniques to divert his or her attention | tell the patient it is all in his or her mind | avoid small talk to help him or her relax | ask the patient if he or she is a gagger |
| If a patient's gag reflex is stimulated during the radiographic procedure, | 2 | 0 | 3 | 4 |
| The use of a thyroid collar is recommended for all of the following radiographic exposures EXCEPT | panoramic | periapical | bitewing | occlusal |
| The use of a thyroid collar is recommended for all of the following radiographic exposures EXCEPT | occspring | blood cells | the patient | bone marrow |
| The use of a thyroid collar is recommended for all of the following radiographic exposures EXCEPT | 20 seconds | 15 seconds | 30 seconds | 25 seconds |
| The annual maximum accumulated dose (MAD) of radiation for dental assistant is based on which of the following calculations? | Age minus 18 times 5 rems/year | age plus 18 times 5 rems/year | age minus 18 times 3 rems/year | age plus 18 times 3 rems/year |
| Which organization regulates the manufacturing and installation of x-ray equipment? | Federal government | American Dental Association | Local Government | State Government |
| Which protection technique is used to minimize x-radiation exposure to the operator? | structural shielding | standing next to the tubehead | Wearing a dosimeter | wearing a lead line apron |
| What is used to measure excessive occupational exposure? | Dosimeter | Lead apron | protective barrier | sensor sleeve |
| What results in a double image on a PSP radiograph? | Exposing the same PSP twice | Processing two unexposed plates together | Processing two exposed plates together | Exposing sensor twice |
| The degree of radiation injury can be determined by the amount of | Tissue irradiated | Free radicals present | genetic effects observed | alpha particles present |
| The BEST radiograph to evaluate a suspected salivary stone in the submandibular gland is a/an | occlusal | panoramic | cephalometric | periapical |
| Which sequence best describes radiation injury to tissue? | Latent period, period of injury, period of recovery | Period of recovery, period of injury, latent period | period of injury, latent period, period of recovery | latent period, period of recovery, period of injury |
| The diameter of the cone-shaped beam produced from a circular collimator is | 275 inches | 2.5 inches | 1.75 inches | 1.50 inches |
| On a computer template for an image, what is automatically labeled? | Date of image | Dentist name | patient address | dental assistant name |
| Radiation injury can be measured by | dose rate | kVp | somatic dose | Ma |
| What structure appears radiopaque on a dental radiograph? | Bone | Air space | Pulp tissue | Periodontal ligament |
| Which condition may mimic caries on an intraoral image? | Root resorption | Residual cysts of the mandible | Pulp stones | Secondary dentin formation |
| What causes elongation on a radiograph? | insufficient vertical angulation | Excessive horizontal angulation | Excessive vertical angulation | Insufficient horizontal angulation |
| Which landmark is seen in a maxillary anterior periapical image? | incisive foramen | Mental foramen | Zygomatic process | genial tubercule |
| Which landmark is useful when mounting images in the maxillary posterior area? | Floor of the maxillary sinus | inferior nasal conchae | internal obilque ridge | external oblique ridge |
Created by:
Chairside
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