Free DANB RHS Practice Test Review

1. How does the use of photostimulable storage phosphor (PSP) plates affect digital radiography?

A. PSP plates are the thickest form of sensor and are the most uncomfortable to the patient
B. PSP plates allow for heat sterilization, making infection control easier to manage
C. PSP plates provide slightly more radiation exposure to the patient than traditional dental film
D. PSP plates do not offer immediate access to the digital image

2. What type of chemical is used in the developing agent to convert the silver halide crystals to black?

A. Potassium bromide
B. Sodium sulfite.
C. Acetic acid
D. Hydroquinone

3. When mounting dental film, the preferred order is:

A.
1. Maxillary anterior periapical
2. Mandibular anterior periapical
3. Bitewing
4. Maxillary posterior periapical
5. Mandibular posterior periapical

B.
1. Bitewing
2. Maxillary anterior periapical
3. Mandibular anterior periapical
4. Maxillary posterior periapical
5. Mandibular posterior periapical

C.
1. Maxillary posterior periapical
2. Mandibular posterior periapical
3. Bitewing
4. Maxillary anterior periapical
5. Mandibular anterior periapical

D.
1. Maxillary anterior periapical
2. Mandibular anterior periapical
3. Maxillary posterior periapical
4. Mandibular posterior periapical
5. Bitewing

4. A patient is moving and asks for the most recent x-rays for the new dentist. Which of the following is NOT the preferred procedure for fulfilling this request?

A. Obtain the original x-rays from the patient's record and give them to the patient to take to the new dentist
B. Prepare a copy of the films and allow the patient to take these to the dentist
C. Obtain contact information from the patient and mail to the new dentist
D. Obtain an email address for the new dentist and send the digital images electronically

5. Which of the following do NOT include anatomical landmarks of the mandible?

A. Lingual foramen, coronoid process, ramus
B. Incisive foramen, mental foramen, genial tubercle
C. Medial sigmoid notch, symphysis, external oblique notch
D. Trabecular patterns, alveolar crest, internal oblique ridge

Answers and Explanation

1. D: There are many advantages to digital radiography in dental offices. Photostimulable storage phosphor (PSP) plates are often used to assist with imaging. The images must first be processed using a processing device that scans the images. Although they are not ready for immediate viewing, they are ready more quickly than images taken with film. PSP plates expose the patient to less radiation and they are thinner and more comfortable for the patient than other types of sensors. Digital radiography allows for instant communication with other dentists or dental professionals if needed for consultation. Digital radiography allows for manipulation of the image as needed for more or less contrast, enlargement of the image, or placement of different colors for diagnostic or viewing purposes.

2. D: Hydroquinone is the type of chemical that is used in the developing agent to turn the silver halide crystals into black metallic crystals. The developing solution is also required to soften the film during the developing process. The developing agent should be rinsed when the film is removed from the solution to stop the developing process. An acidic solution, such as sodium thiosulfate or ammonium thiosulfate, is the fixing agent, and is used to remove any of the undeveloped silver halide crystals from the film. After the fixing agent is used, the film must be washed in a water bath and then dried. Many dental offices have automatic film-developing processors but it is still helpful to be able to knowledgeable about the process.

3. A: When mounting a full-mouth series of dental x-rays, it is important to start with clean hands to prevent finger marks from getting onto the films. The embossed dot on each film needs to be placed with the dot facing up. This is called the labial mounting method and the dots are convex. The films should then be sorted according to the view: anterior periapical, bitewing, and posterior periapical views. The roots for each should be pointed in the correct direction depending upon whether it is mandibular or maxillary. The preferred order for mounting is maxillary anterior periapical, followed by mandibular anterior periapical, followed by bitewing films, followed by maxillary posterior periapical, followed by mandibular posterior periapical films. After the films are sorted and mounted, the orientation of the dots and the order should be double-checked for accuracy.

4. A:All dental radiographs are the legal property of the dentist. Patients do have the right to obtain copies of their x-rays for purposes such as transferring to a new dentist or seeing a specialist such as an orthodontist. Original x-rays should never be given to a patient. All dental records should be kept indefinitely for legal purposes. Only copies should be given. The patient can physically take copies of radiographs to the new dentist or they can be mailed once contact information is provided. Digital radiographs can be e-mailed electronically to a new dentist or to a specialist. Legal requirements for patient confidentiality must be adhered to. Digital images may require encryption if the public Internet is used. The patient should also sign a release in regard to x-ray transfer, and a notation should be made in the patient's record regarding this issue.

5. B: Anatomical landmarks of the mandible are located around the lower jaw. The incisive foramen is a maxillary landmark. There are many mandibular anatomical landmarks. It is important to be able to identify these landmarks based on location and degree of radiopacity or radiolucency. Mandibular landmarks include mental foramen, mandibular canal, external oblique ridge, trabecular patterns, and alveolar crest. Mandibular landmarks also include the mandibular retromolar area, lingual foramen, genial tubercle, internal oblique ridge, mandibular foramen, border of the mandible, and the body of the mandible. Landmarks also include the condyle, coronoid process, medial sigmoid notch, ramus, symphysis, and nutrient canals. Sometimes the hyoid bone can be seen on dental x-ray.

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Last Updated: 04/18/2018


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