RDA Cheat Sheet 2026

The 30 highest-yield RDA facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which type of glove is NOT acceptable for use during patient examination and treatment procedures in dentistry? → Household utility gloves used for patient care
2. Which statement best describes the concept of direct supervision in dental assisting? → The dentist is physically present in the facility and authorizes each procedure performed
3. Overlapping of the interproximal contacts on a bitewing radiograph is a common error caused by: → Incorrect horizontal angulation
4. In a dental office, RDAs typically work closely with which of the following professionals? → Dentists and dental hygienists
5. What type of radiograph is used to examine the floor of the mouth, calculi in salivary glands, or impacted teeth? → Occlusal radiograph
6. Which cement is most appropriate for the final cementation of a porcelain-fused-to-metal (PFM) crown on a vital tooth? → Resin-modified glass ionomer (RMGI) cement
7. According to the Spaulding Classification system, which of the following is considered a semi-critical instrument? → Amalgam condenser
8. To minimize musculoskeletal strain, an RDA should position the patient so that: → The operative field is at the operator's elbow height
9. How should an RDA handle a patient who is nervous about a procedure? → Explain the procedure calmly and provide reassurance
10. Using the Universal Numbering System, what number is assigned to the maxillary left central incisor? → #9
11. Which of the following actions would be considered a violation of HIPAA and a breach of patient confidentiality? → Discussing a patient's treatment in the office reception area
12. If a patient experiences a grand mal seizure in the dental chair, the primary responsibility of the dental team is to: → Prevent the patient from injury and clear the area
13. What is the correct compression-to-ventilation ratio for adult CPR according to the AHA? → 30:2
14. A child patient refuses to open their mouth for an examination. Which approach reflects the BEST use of behavior management skills? → Use tell-show-do technique and speak calmly at the child's level
15. Which of the following BEST describes good ergonomic practices for an RDA during long procedures? → Maintaining neutral posture, adjusting chair height, and taking micro-breaks when possible
16. Regarding dental unit waterlines, what is the recommended colony-forming unit (CFU) standard for dental treatment water? → Less than 500 CFU/mL (CDC-recommended standard for dental water)
17. Which local anesthetic agent is classified as an amide and is the most commonly used in dentistry? → Lidocaine
18. What is one of the RDA’s key roles in maintaining a sterile environment in the dental office? → Sterilizing dental instruments and equipment
19. Why is compassion an important trait for a Registered Dental Assistant? → It improves communication with patients and relieves their anxiety
20. Which behavior BEST demonstrates professionalism when a coworker makes a clinical error that affects patient care? → Correct the error using appropriate channels and report it according to office protocol
21. What is the RDA's role when a patient has a latex allergy and requires dental treatment? → Ensure all latex-containing products are removed from the operatory before treatment
22. The non-functional, fifth cusp often found on the mesiolingual surface of a permanent maxillary first molar is called the: → Cusp of Carabelli
23. Which of the following is the MOST important attribute for maintaining patient confidentiality in a dental office? → Sharing information only with those directly involved in the patient's care
24. An RDA is charting during a dental examination. The dentist calls out 'MOD' on tooth #19. What does this abbreviation indicate? → A mesial, occlusal, and distal surface restoration or caries
25. What condition describes teeth that overlap horizontally, where the upper anterior teeth protrude beyond the lower anteriors? → Overjet
26. An RDA notices a patient's chart lists a penicillin allergy but the dentist writes a prescription for amoxicillin. What should the RDA do? → Alert the dentist immediately about the potential allergy conflict
27. Which item should be placed in a sharps container immediately after use in the dental setting? → Used local anesthetic needle
28. The radiographic error that results in images appearing shorter and more stout than their actual size is called foreshortening. What is the cause? → Excessive vertical angulation
29. An anxious patient begins to breathe rapidly and complains of tingling in their fingers and lightheadedness. This is most likely a sign of: → Hyperventilation
30. Why do some states require RDAs to pass a state-specific jurisprudence exam? → To ensure candidates understand state dental practice laws and regulations