RDA Exam Flashcards

Q: What does the California RDA exam cover?

The California Registered Dental Assistant Combined Written and Law and Ethics Examination covers four domains from the 2023 Dental Board outline: Dental Procedures (50%), Infection Control and Health/Safety (25%), Assessment and Diagnostic Records (15%), and Laws and Regulations (10%). The exam blends clinical chairside knowledge with California-specific scope-of-practice and ethics content, and is delivered by PSI after the Dental Board approves your RDA Examination and Licensure application.

Q: How many questions are on the California RDA exam?

The current RDA exam has 125 total multiple-choice items: 100 scored items and 25 unscored pretest items. Candidates have 3 hours to finish. Results are reported as pass or fail using a criterion-referenced passing standard, so the Dental Board does not release a numeric score. The 2023 outline drives item distribution, with Dental Procedures the largest single domain at 50%.

Q: How much does the California RDA exam cost in 2026?

Plan for at least $166.59: a nonrefundable $120 Dental Board of California application fee plus a $46.59 PSI examination registration fee. Additional costs depend on your pathway and may include required courses (Radiation Safety, Coronal Polishing, Pit and Fissure Sealants, Infection Control, California Dental Practice Act, Basic Life Support), board-approved education or work documentation, and DOJ/FBI fingerprint Live Scan fees.

Q: What is the RDA scope of practice in California?

Registered Dental Assistants in California may perform expanded supervised duties beyond an unlicensed dental assistant. Under direct or general dentist supervision (depending on the procedure) RDAs can place and adjust temporary restorations, take final impressions for indirect restorations, apply pit-and-fissure sealants, place periodontal dressings, perform coronal polishing, expose radiographs, take vital signs, and assist with anesthesia. The full list is defined in Business and Professions Code section 1750.1 and Title 16 CCR section 1085.

Q: How long does it take to study for the California RDA exam?

Most candidates plan 60 to 100 hours of study spread over 4 to 8 weeks. Weight your schedule by domain: about half your time on Dental Procedures, a quarter on Infection Control and Health/Safety, and the remainder on Assessment/Diagnostic Records and California Laws and Regulations. Combine flashcards for vocabulary recall with timed practice questions and full-length practice exams to build endurance for the 3-hour PSI session.

Q: What happens if I fail the California RDA exam?

PSI automatically receives retake eligibility about one week after a failed or missed attempt, and you can usually reschedule with PSI in 7 to 10 business days without filing a new Dental Board application. The Dental Board does not impose a cap on attempts, but you must take the exam within two years after the Board receives your application. If that window expires you must reapply and pay the $120 application fee again.

Question 1

Universal Numbering System

Accepted Answer

Adopted by the ADA in the United States. Permanent teeth are numbered 1-32 starting at the maxillary right third molar (#1) and ending at the mandibular right third molar (#32). Primary teeth use letters A-T in the same sequence.

Question 2

Palmer Notation System

Accepted Answer

Divides the mouth into four quadrants using a bracket symbol. Each quadrant numbers permanent teeth 1-8 starting at the central incisor and moving distally. Primary teeth use letters A-E in the same pattern. Commonly used in orthodontics.

Question 3

FDI (ISO 3950) Two-Digit Notation

Accepted Answer

International system used outside the U.S. First digit identifies quadrant (1-4 permanent, 5-8 primary), second digit identifies tooth position 1-8 from the midline. Example: #11 is the permanent maxillary right central incisor.

Question 4

Anatomical Tooth Surfaces

Accepted Answer

Five surfaces per tooth: Mesial (toward midline), Distal (away from midline), Facial/Buccal/Labial (toward cheek or lip), Lingual/Palatal (toward tongue or palate), Occlusal (chewing surface of posteriors) or Incisal (biting edge of anteriors).

Question 5

Black's Cavity Classification

Accepted Answer

G.V. Black classified caries by location: Class I (pits and fissures), Class II (proximal of posteriors), Class III (proximal of anteriors, no incisal), Class IV (proximal of anteriors with incisal angle), Class V (cervical third of any tooth), Class VI (cusp tips or incisal edges).

Question 6

Dental Amalgam

Accepted Answer

A direct restorative alloy of mercury combined with silver, tin, copper, and sometimes zinc. Used in posterior teeth where strength matters more than esthetics. Triturated immediately before placement. Scrap amalgam must be captured by an ISO 11143-compliant amalgam separator under EPA dental effluent rules.

Question 7

Composite Resin

Accepted Answer

Tooth-colored restorative containing a resin matrix (typically Bis-GMA) with inorganic filler particles. Light-cured in 2 mm increments to reduce polymerization shrinkage. Requires a dry, acid-etched, bonded surface; moisture contamination causes failure.

Question 8

Glass Ionomer Cement (GIC)

Accepted Answer

Restorative and luting material that releases fluoride and bonds chemically to enamel and dentin. Used for Class V restorations, pediatric restorations, liners, and luting crowns. Sensitive to moisture during initial set but mechanically weaker than composite.

Question 9

Zinc Oxide-Eugenol (ZOE / IRM)

Accepted Answer

Provisional restorative and base material. Eugenol has a sedative effect on the pulp, making it useful under deep restorations. Should NOT be placed under resin-based restorations because eugenol inhibits polymerization of resin cements and composites.

Question 10

Alginate Impression Material

Accepted Answer

An irreversible hydrocolloid used for preliminary impressions, study models, and opposing arches. Mixed with water; setting accelerates in warm water. Must be poured within about 15 minutes to prevent dimensional change from syneresis (water loss) or imbibition (water gain).

Question 11

Polyvinyl Siloxane (PVS) Impression

Accepted Answer

An addition-reaction silicone elastomer used for final impressions because of high dimensional accuracy. Hydrophobic versions need a dry field. Latex gloves can inhibit set; use nitrile or vinyl gloves when handling unset PVS.

Question 12

Dental Dam (Rubber Dam)

Accepted Answer

Latex or non-latex sheet that isolates teeth, providing moisture control, soft-tissue retraction, and patient airway protection. Required for endodontic procedures to keep the canal field aseptic and to prevent aspiration or swallowing of instruments and irrigants.

Question 13

Four-Handed Dentistry Zones

Accepted Answer

The operatory is divided around the patient's head: Operator zone, Assistant zone, Transfer zone (where instruments are passed, above the patient's chest), and Static zone (behind the patient, for the mobile cart). Goal: efficient, ergonomic, instrument-ready support.

Question 14

High-Volume Evacuation (HVE)

Accepted Answer

Large-bore suction tip used by the assistant to remove water, saliva, blood, and aerosols during procedures. Reduces aerosol exposure when used with the high-speed handpiece. Tip should be parallel to the buccal surface of the tooth being treated and just distal to it.

Question 15

Provisional (Temporary) Restoration Purpose

Accepted Answer

Protects prepared tooth structure, maintains occlusal and proximal contacts, preserves esthetics, and prevents tooth migration while a permanent indirect restoration is fabricated. California RDAs may place and adjust provisional restorations under dentist supervision.

Question 16

Pit and Fissure Sealant

Accepted Answer

Resin-based coating applied to deep occlusal pits and fissures of caries-free posterior teeth to prevent decay. California requires a board-approved sealant course before an RDA may place sealants under the supervising dentist's authorization.

Question 17

Coronal Polishing

Accepted Answer

Removal of plaque and extrinsic stain from clinical crowns using a rubber cup and prophy paste; it does not remove calculus. California RDAs may perform coronal polishing only after completing a board-approved course; supragingival scaling remains an RDH function.

Question 18

Topical Fluoride Application

Accepted Answer

Delivered as foam, gel, varnish, or rinse to strengthen enamel and reverse early demineralization. 5% sodium fluoride varnish (22,600 ppm F) is the workhorse for in-office application. Instruct caries patients to avoid eating, drinking, or brushing for at least 30 minutes after varnish.

Question 19

Paralleling vs. Bisecting Angle Technique

Accepted Answer

Paralleling: film/sensor placed parallel to the long axis of the tooth, central ray perpendicular to both; produces the most accurate, lowest-distortion image and is the preferred intraoral method. Bisecting: central ray aimed perpendicular to an imaginary bisector between the tooth axis and the receptor; used when anatomy prevents paralleling.

Question 20

kVp vs. mA in Dental Radiography

Accepted Answer

kVp (kilovoltage peak) controls the energy/penetrating power of the X-ray beam and the image contrast - higher kVp produces longer scales of gray. mA (milliamperage) controls the quantity of electrons and therefore the density (overall darkness) of the image. Exposure time multiplies mA effects.

Question 21

ALARA Principle

Accepted Answer

As Low As Reasonably Achievable. Radiation exposure must be minimized through use of fast-speed receptors (F-speed film or digital sensors), rectangular collimation, lead apron with thyroid collar, proper technique, and operator distance and shielding.

Question 22

Operator Position During X-Ray Exposure

Accepted Answer

Stand at least 6 feet from the tube head OR behind a protective barrier (lead-equivalent wall). Position at a 90-135 degree angle to the primary beam. Never hold the receptor or tube head for the patient.

Question 23

Lead Apron and Thyroid Collar

Accepted Answer

Required for every intraoral and most extraoral exposures in California. The thyroid collar is omitted only when it would obscure the diagnostic field (some panoramic and cephalometric views). Aprons should be stored flat or on a rounded hanger, never folded, to prevent cracks in the lead.

Question 24

NCRP Occupational Dose Limit

Accepted Answer

The National Council on Radiation Protection and Measurements recommends an annual occupational whole-body effective dose limit of 50 mSv (5 rem) and a lifetime cumulative limit of 10 mSv times the worker's age. The pregnant occupational worker monthly equivalent dose limit is 0.5 mSv to the embryo/fetus.

Question 25

Image Receptor Speed

Accepted Answer

F-speed (InSight) film requires roughly 60% less radiation than D-speed film for the same diagnostic image and is the current ADA-recommended film. Digital sensors (CCD/CMOS or PSP plates) typically reduce dose another 30-50% compared to F-speed film.

Question 26

Spaulding Classification

Accepted Answer

Categorizes patient-care items by infection risk: Critical (penetrate soft tissue or bone - need STERILIZATION), Semi-critical (contact mucous membranes or non-intact skin - need sterilization or high-level disinfection), Non-critical (contact intact skin only - need low- or intermediate-level disinfection).

Question 27

Sterilization vs. Disinfection

Accepted Answer

Sterilization destroys ALL microorganisms including bacterial spores and is required for critical and semi-critical items. Disinfection destroys most pathogens but not all spores and is used on non-critical surfaces or heat-sensitive items. Always clean before sterilizing or disinfecting.

Question 28

Steam Autoclave Parameters

Accepted Answer

Standard gravity-displacement cycle: 121 degrees C (250 degrees F) at 15 PSI for at least 15-30 minutes. Flash/pre-vacuum cycles run hotter and shorter (e.g., 132 degrees C / 270 degrees F for 4 minutes wrapped). Items must be cleaned, dried, and properly packaged before the cycle.

Question 29

Dry Heat Sterilization

Accepted Answer

Used for items that corrode in steam (carbon-steel burs, cutting instruments). Typical cycle: 160 degrees C (320 degrees F) for 2 hours or 170 degrees C (340 degrees F) for 1 hour. Slower than autoclaving and unsuitable for heat-sensitive plastics.

Question 30

Sterilization Monitoring (CDC)

Accepted Answer

Three indicators: Mechanical (time, temperature, pressure gauges each cycle), Chemical (process indicator on each package + internal indicator inside), and Biological (spore test) at LEAST WEEKLY using Geobacillus stearothermophilus for steam autoclaves. Log all results and quarantine implants until biological results return negative.

Question 31

OSHA Bloodborne Pathogen Standard (29 CFR 1910.1030)

Accepted Answer

Requires a written exposure control plan reviewed annually, free Hepatitis B vaccination for at-risk employees, engineering and work-practice controls, free PPE, sharps injury log, annual training, and post-exposure evaluation. In California, Cal/OSHA's Aerosol Transmissible Diseases (ATD) standard adds airborne and droplet pathogen controls.

Question 32

Dental Unit Waterline (DUWL) Quality

Accepted Answer

CDC and ADA recommend that dental unit water used for non-surgical procedures contain no more than 500 CFU/mL of heterotrophic bacteria, matching EPA drinking-water standards. Routine treatment requires chemical germicides, periodic shocking, and monitoring per manufacturer instructions.

Question 33

Standard Precautions

Accepted Answer

Infection-control practices applied to EVERY patient regardless of known disease status. Treat all blood, saliva, and other body fluids as potentially infectious. Includes hand hygiene, PPE, safe injection practices, sharps safety, environmental surface disinfection, and proper instrument reprocessing.

Question 34

PPE Donning and Doffing Sequence

Accepted Answer

Donning order: gown -> mask/respirator -> protective eyewear/face shield -> gloves. Doffing order (most-to-least contaminated): gloves -> eyewear -> gown -> mask. Perform hand hygiene immediately after removing all PPE and any time gloves are changed.

Question 35

Surgical Mask vs. N95 Respirator

Accepted Answer

A surgical/procedure mask blocks splatter and large droplets but does not seal to the face. An N95 filtering facepiece respirator filters at least 95% of 0.3-micron airborne particles and requires medical clearance, annual fit testing, and a user seal check each time it is worn under the Cal/OSHA ATD standard.

Question 36

Sharps Safety and Recapping

Accepted Answer

Never bend, break, or two-hand recap a contaminated needle. Use a one-handed scoop technique or a mechanical recapping device. Dispose of sharps immediately in an FDA-cleared, puncture-resistant, leak-proof, labeled (biohazard) container that is not overfilled past the fill line.

Question 37

Post-Exposure Protocol for Needlestick

Accepted Answer

Immediately wash the site with soap and water (flush mucous membranes with saline or water), report to the supervisor, and start the OSHA-required post-exposure evaluation within 1-2 hours: source-patient testing, exposed worker baseline labs (HBV, HCV, HIV), and consideration of HIV post-exposure prophylaxis.

Question 38

Vital Signs Reference Ranges (Adult)

Accepted Answer

Pulse 60-100 bpm; respirations 12-20 per minute; temperature about 37 degrees C (98.6 degrees F); blood pressure under 120/80 mmHg is normal per AHA, 120-129/<80 elevated, 130-139/80-89 stage 1 hypertension, and 140+/90+ stage 2. Document baseline before any procedure that may stress the cardiovascular system.

Question 39

ASA Physical Status Classification

Accepted Answer

American Society of Anesthesiologists scale: I healthy, II mild systemic disease (controlled hypertension, diabetes), III severe systemic disease that limits activity, IV severe disease that is a constant threat to life, V moribund, VI brain-dead organ donor. Routine outpatient dentistry is generally limited to ASA I-III without modification.

Question 40

Medical Conditions Requiring Dentist Alert

Accepted Answer

Always flag uncontrolled diabetes, recent myocardial infarction (within 6 months), bleeding disorders or anticoagulant therapy, pregnancy, latex/medication allergies, recent joint replacement requiring antibiotic prophylaxis per AHA/ADA guidance, immunosuppression, and active infectious disease before any procedure starts.

Question 41

Medical Emergency: Syncope

Accepted Answer

The most common dental medical emergency. Recognize pallor, sweating, lightheadedness. Place the patient in Trendelenburg (supine, feet elevated), maintain airway, administer oxygen, monitor pulse and BP, and use ammonia inhalants if needed. Document the event and obtain medical clearance before resuming treatment.

Question 42

Medical Emergency Kit Essentials

Accepted Answer

Oxygen with positive-pressure delivery, automated external defibrillator (AED), epinephrine 1:1,000 auto-injector for anaphylaxis, diphenhydramine (antihistamine), albuterol inhaler for asthma, nitroglycerin for angina, oral glucose for hypoglycemia, and aspirin 325 mg for suspected MI. Check expiration dates monthly.

Question 43

Local Anesthetic Maximum Dose

Accepted Answer

Lidocaine 2% with 1:100,000 epinephrine: maximum 7 mg/kg up to 500 mg in a healthy adult (about 13 cartridges of 1.8 mL). California RDAs do NOT administer local anesthetic injections; that scope belongs to dentists, dental hygienists in alternative practice, and RDAEFs with appropriate authorization.

Question 44

California Dental Practice Act

Accepted Answer

Business and Professions Code, Division 2, Chapter 4. Establishes the Dental Board of California, defines scope of practice and supervision levels (general, direct, personal), licenses dentists and allied dental personnel, and authorizes the Board to discipline licensees. RDAs are required to complete a Board-approved Dental Practice Act course.

Question 45

Levels of Supervision in California

Accepted Answer

General supervision: dentist has authorized procedures but need not be present. Direct supervision: dentist is present in the office, has examined the patient, and authorizes and checks the procedure. Personal supervision: dentist is in the operatory directing the procedure. Each RDA duty is mapped to one of these levels in Title 16 CCR.

Question 46

RDA Renewal and Continuing Education

Accepted Answer

California RDA licenses renew every 2 years. RDAs must complete 25 hours of approved continuing education each cycle, including required courses in California Dental Practice Act, Infection Control, and Basic Life Support. CE must be from Dental Board-approved providers; keep records for at least 4 years for audit.

Question 47

Mandated Reporting

Accepted Answer

Dental professionals are mandated reporters under California Penal Code section 11165.7 for suspected child abuse/neglect (report to law enforcement or Child Protective Services as soon as practicable, written within 36 hours) and elder/dependent adult abuse under Welfare and Institutions Code 15630. Failure to report is a misdemeanor.

Question 48

HIPAA Privacy Rule in Dental Practice

Accepted Answer

Protects individually identifiable health information (PHI). Requires a Notice of Privacy Practices, minimum-necessary disclosure, patient access to records (response within 30 days), business associate agreements with vendors handling PHI, and breach notification. California's CMIA can be stricter than HIPAA, so apply the more protective rule.

Question 49

Informed Consent in Dentistry

Accepted Answer

Requires that the patient (or legal guardian) understand the diagnosis, proposed treatment, material risks and benefits, reasonable alternatives, and the option of no treatment. The supervising dentist obtains informed consent; the RDA may witness the signature and confirm patient understanding but cannot legally provide the consent discussion.

Question 50

Dental Record Retention in California

Accepted Answer

Dentists must retain adult dental records for at least 7 years after the last visit and minors' records until the patient reaches age 25 (per Dental Board guidance and CCR Title 16). Records must include radiographs, treatment notes, consent forms, and a clear chronological history; alteration or destruction to defraud is grounds for discipline.

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