DANB RHS Exam study questions with COMPLETE SOLUTION | 150 Questions with 100% Correct Answers
DANB RHS Exam study questions
Why do we take x rays? - ✔✔To determine the dental health status of a patient beyond the oral
exam.
Periapical (PA) - ✔✔The tissues surrounding the apex of the root of a tooth.
Who benefits from dental xrays? - ✔✔Patient, Practice, Insurance.
What is the primary benefit of an xray? - ✔✔To detect disease.
Decay is the most common reason, Periodontal disease is the second most common reason.
What is the most lucrative reason for an xray in the State of Maine? - ✔✔Trauma xrays make the
most money in the state of Maine (at hospitals)
What is a Dental Fistula? - ✔✔Also called a gum boil or a parulis is an infection at the base of
the tooth which forms inflamed pus. Dental fistula if not treated starts with a tooth abscess and
normally ends on the gingiva or slightly in the oral vestibule.
What can be found in an xray? - ✔✔Developing teeth, missing teeth, supernumary teeth(extra),
impacted teeth, caries(decay), recurrent caries, periodontal disease, dilacerated roots(abnormal
curves), retained root tips, periapical lesions/infections.
Radiopaque - ✔✔The light or white areas of the film. The more dense the tissue or material, the
whiter it will appear.
Radiolucent - ✔✔Dark areas that x rays pass through easily.
Furcation - ✔✔Bone has been eaten away. Usually the result of periodontal disease.
What is the difference between radiographic interpretation and radiographic diagnosis? -
✔✔Interpretation is the ability to read and explain what is revealed by a radiograph. Diagnosis is
giving a disease or condition to the image that is seen.
THE DOCTOR IS THE ONLY ONE WHO CAN LEGALLY GIVE A RADIOGRAPHIC
DIAGNOSIS.
Density - ✔✔The overall darkness of the x-ray picture.
What are the 4 parts of a tooth? - ✔✔Enamel, dentin, root/pulp, cementum.
Contrast - ✔✔Level of differentation between the black/white/grey areas of the film. Higher
contrast is very black and white, lower contrast has more shades of grey.
What are the two things that radiographic contrast depend on? - ✔✔Subject contrast and film
contrast.
What is subject contrast? - ✔✔The result of differences in absorption of the xray by tissues.
What are the three factors in subject contrast? - ✔✔THE PATIENT:Each tissue has a different
contrast. Depending on size, the patient may have more levels of tissue for greater contrast.
KVP:this is the quality of the xray beam. the higher the beam, the more wavelengths are
produced and the greater the potential for contrast.
SCATTER RADIATION:The more that this sort of xray hits the film, the more it is exposed and
the kess contrast the picture will eventually take on.
What is film contrast? - ✔✔The contrast that comes from characteristics of the film and
processing.
What are the three factors in film contrast? - ✔✔Film type, exposure time(over and undereposed
films will result in poor contrast), processing(if done incorrectly, it may ruin the contrast built
into the film by the manufacturer.
What happens if a film is exposed to too much/too little light? - ✔✔Too much-darker
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