Free Registered Dental Assistant Certification Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Registered Dental Assistant Certification Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1When answering a prospective patient's call, which greeting follows the ADA's recommended standard?

   1. A. Give the practice name and ask the caller to state the reason for calling.
   2. B. Give the practice name and staff member's name, then invite the reason for the call.
   3. C. Give the staff member's name and request insurance details before asking the reason.
   4. D. Give the staff member's name and transfer the call before asking the reason.

   Answer: B

   Explanation: The ADA says a standard greeting "mentions the name of the practice, the name of the person speaking and that it invites the caller to share the reason for their call." B includes all three elements.

   Reference: Phone Calls from Prospective Patients — Phone Calls from Prospective Patients, telephone greeting

2. 2Which type of tooth is located at the front of the mouth and is used for cutting food?

   1. A. Incisor
   2. B. Premolar
   3. C. Molar
   4. D. Third molar

   Answer: A

   Explanation: The ADA glossary defines an incisor as "A tooth for cutting or gnawing; located in the front of the mouth in both jaws." This identifies A.

   Reference: Glossary of Dental Terms — I, incisor

3. 3Why must an air-driven dental handpiece be reprocessed between patients even when its exterior looks clean?

   1. A. Its internal components can retain patient material.
   2. B. An exterior wipe removes all material retained inside the handpiece.
   3. C. A clean-looking exterior proves internal parts need no processing.
   4. D. A brief waterline flush alone sterilizes internal components.

   Answer: A

   Explanation: CDC states, "The internal components of air-driven dental handpieces (both low-speed and high-speed devices) can become contaminated with patient material during use." Exterior appearance does not reveal that internal contamination.

   Reference: Best Practices for Dental Handpieces — Why it matters

4. 4Which receptors does the FDA describe as direct digital dental radiography detectors?

   1. A. CCD and CMOS solid-state sensors
   2. B. Photostimulable phosphor plates only
   3. C. Conventional film packets only
   4. D. Rare-earth intensifying screens only

   Answer: A

   Explanation: The FDA states, "Systems that use CCD and CMOS- based, solid-state detectors are called “direct.”" These sensors transmit image signals to a computer without plate scanning.

   Reference: The Selection of Patients for Dental Radiographic Examinations — Receptor Selection, digital imaging

5. 5What is the main purpose of using scripts for common dental office telephone topics?

   1. A. To ensure a consistent message reaches each patient.
   2. B. To eliminate the need to listen to each patient.
   3. C. To replace the patient's intake documentation.
   4. D. To make every call follow the same length.

   Answer: A

   Explanation: The ADA explains that "Scripts ensure that the same message is communicated to every patient every time." Consistency is the purpose; scripts do not replace listening or documentation.

   Reference: Phone Calls from Prospective Patients — Phone Calls from Prospective Patients, telephone scripts

6. 6Which teeth lie behind the premolars and have broad chewing surfaces for grinding?

   1. A. Incisors
   2. B. Cuspids
   3. C. Molars
   4. D. Premolars

   Answer: C

   Explanation: The ADA glossary identifies molars as "Teeth posterior to the premolars (bicuspids) on either side of the jaw; grinding teeth, having large crowns and broad chewing surfaces." C fits both location and function.

   Reference: Glossary of Dental Terms — M, molar

7. 7Which reprocessing method does CDC recommend for a removable dental handpiece between patients?

   1. A. Clean and heat sterilize it.
   2. B. Wipe its exterior with a low-level disinfectant.
   3. C. Immerse it in a chemical germicide.
   4. D. Flush it with water and store it dry.

   Answer: A

   Explanation: CDC directs staff to "Clean and heat sterilize handpieces and other intraoral instruments that can be removed from the air- and waterlines of dental units." The other methods do not reprocess internal surfaces adequately.

   Reference: Best Practices for Dental Handpieces — Key points

8. 8What distinguishes a photostimulable phosphor plate from a direct digital sensor after X-ray exposure?

   1. A. It stores a latent image that must be scanned.
   2. B. It exposes conventional film by chemical development.
   3. C. It displays an image immediately without scanning.
   4. D. It replaces the X-ray beam with visible light.

   Answer: A

   Explanation: The FDA explains, "When these plates are irradiated, a latent image is stored on them. The plate is then scanned and the scanner transmits the image to the computer." This scan step characterizes indirect PSP imaging.

   Reference: The Selection of Patients for Dental Radiographic Examinations — Receptor Selection, PSP plates

9. 9During a prospective patient's first appointment call, which detail helps identify whether the concern may be urgent?

   1. A. The date of the last dental appointment.
   2. B. The patient's preferred contact method.
   3. C. The reason for the call and whether it involves an emergency.
   4. D. The patient's dental benefit plan.

   Answer: C

   Explanation: The ADA lists "The reason for the call, especially whether it’s an emergency or a specific dental concern" among intake questions. That detail directly identifies urgency.

   Reference: Phone Calls from Prospective Patients — Phone Calls from Prospective Patients, new patient intake questions

10. 10What tissue covers dentin in the crown of a tooth?

    1. A. Cementum
    2. B. Enamel
    3. C. Pulp
    4. D. Periodontal ligament

    Answer: B

    Explanation: ADA MouthHealthy defines enamel as "Hard calcified tissue covering the dentin in the crown of tooth." B is the crown covering.

    Reference: Tooth — The Anatomy of a Tooth, Enamel