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DAMB RHS EXAM
Question | Answer |
---|---|
Why do we take x-rays? | To determine the dental health status of a patient beyond the oral exam (clinical exam). |
What is a periapical (PA) | The tissues surrounding the apex of the root of a tooth 2-3mm |
Who benefits from dental x-rays? | Patient, Practice, Insurance |
What is the primary benefit of an xray? | To detect disease. Decay and Periodontal disease |
What can be found in an xray | Developing teeth, missing teeth, supernumary teeth (extra), impacted teeth, caries, recurrent caries, periodontal disease, dilacerated roots (abnormal curves), retained root tips, periapical lesions/infections |
Define 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 |
Difference between interpretation and diagnosis | Interpretation- ability to read and explain what is revealed by a radiograph. Diagnosis- Giving a disease or condition to the image that is seen |
Define Density | The overall darkness of the x-ray picture |
Define contrast | Level of differentation between the black/white/gray areas of the film. Higher contrast is very black and white, lower contrast has more shades of gray |
What are the three factors for an x-ray | Time, kilovoltage, and miliamperage |
Within the x-ray tube, electrons are generated by the | tungsten filament in the cathode |
The "Guidelines for Prescribing Dental Radiographs" states that | Dentulous adult recall patients who are not at increased risk for caries should have posterior bite-wing examinations at 24-36 month intervals |
You are going to take dental images on your patient/ He is larger than average. What machine setting adjustment should you make prior to taking dental images | Increase impulses |
Stochastic biologic effects from radiation | occur as a result of exposure, but severity is not determines by dose |
When the film exits the film processor, you notic that is appears foggy and tacks detail. What could be a possible solution to prevent this from occuring with the next patient's film | Eliminate light leaks |
The stepwedge technique for evaluating developer strength relies on exposing one exposed stepwedge film | each day |
To test the automatic film processor, {BLANK} in the automatic processor. | Unwrap two unexposed films, expose one to light and then process both films |
What is true about the development step in film processing | Developing is the first step in processing film |
The overall apperance of your film is too dark. Which of the following is the cause of this error | Film was in the developer too long |
To create a reference radiograph, what needs to be fresh | FIlm, developer, fixer |
In order to perform the safelighting test, you would use {BLANK} | a coin |
When a stepwedge technique is used to evaluate developer strength, and the density on the daily radiograph differs from that on the standard radiograph by more than one {blank} steps, the developer solution is depleted | Two |
Generally, there are {blank} elements to informed consent | Four |
Your former patient has moved and would like his records including the original radiographs sent to his new dentist. What would you do? | Keep the original films, and send the news dentist a duplicate set |
The bite-wing image is used in the | interproximal examination |
Your patient has no clinical sign of disease, how frequently should you take a CMS on your patient | You CANNOT take a CMS |
your new adult patient has no clinical sign of disease and no restorations. What type of images should you take | Bite-Wings |
Mounted radiographs increase | accessibility for interpretation |
In the labial mounting method, radiographs are placed with the {blank} side of the identification dot facing the viewer. They are then viewed from the {blank} aspect | Raised Labial |
According to your text , when viewing radiographs in sequential order, the third step in viewing radiographs should begin with the | mandibular left side |
Which of the following areas would appear the most radiopaque on a dental image | Enamel |
If the operating kilovoltage is increased, the receptor density {blank} because the average energy of the x-rays is raised | increases |
A stepwedge will reveal that images taken at a lowes kV will have {BLANK} than images taken at a higher kV | a higher contrast |
the geometric characteristic of {BLANK} referes to an image that appears larger than the actual size of the object it represents | Magnification |
What are the influencing factors would degrade sharpess | Larger silver halide crystal size AND Larger focal spot |
What is a true statemtnt reguarding the use of lead aprons and throid collars | The apron should cover from the neck to just above the patient's knees |
A dental assistant experiencences an occupational exposure. A patient's blood has splased into the employee's eye. What is an appropriate step to take? | Document the incident, including the source individual, the employee, route of exposure, and how it happened |
What is flase regarding handwashing | Alcohol-based hand gel can be used in place of soap and water on hands that are visibly dirty |
A new patient has recently moved to the area and arrives for her first appointment in the detal practice. She is 6 months pregnant. She is complaining of a tootache. She does not bring dental records with her. What would be the most appropriate? | Only x-ray the area she is complaining about using the lead apron and thyroid collar for protection |
How does the use of photostimulable storage phosphor (PSP) plates affect digital radiography | PSP plates do not offer immeditate access to the digital image |
What would NOT be a reason for the dental x-ray image to come out black? | Processing time is too short |
What will happen to an x-ray film that is left in the processing solution too long | The image with be either partially or completely missing |
During manual processing, how long should the film remain in the developer solution if the temperature of the solution is 65F | 6 minutes |
What can be disposed of in the regular trash or down the drain | Developer |
What do NOT include anatomical landmarks of the mandible | Incisive foramen, mental foramen, genial tubercle |
When identifying anatomical structures and dental materials on radiograph, what is TRUE | The dentin is not as radiopaque as enamel |
For manual duplication of x-ray films, what conditions is incorrect | Film duplication can be done in the regular office setting without any special conditions |
What is the function of the collimator | It forms the shape and size of the x-ray beam upon leaving the tubehead |
What best describes the effects of long-term low-dose radiation exposure | The effect of long-term low-dose radiation exposure can cause changes at the cellular level in the human body that would b be observed for many years |
A young patient is having difficulty holding still for x-rays. What is the most appropriate step for the dental assistant to take? | Ask the parent to have the child sit on his or her lap with both covered by the lead apron |