Free Practice Questions for RDA

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Key Facts: RDA Exam

125

Exam Questions

100 scored + 25 pretest

Pass/Fail

Passing Score

Criterion-referenced

3 hrs

Exam Duration

PSI

$166.59

Exam Fee

Application + PSI

50%

Dental Procedures

Largest domain

2 years

License Renewal

CE required

The California RDA combined written and law/ethics exam currently has 125 total multiple-choice items: 100 scored and 25 pretest. Candidates have 3 hours, the passing standard is criterion-referenced, and PSI reports pass/fail results without releasing the actual score. The official 2023 outline weights Dental Procedures at 50%, Infection Control and Health/Safety at 25%, Assessment and Diagnostic Records at 15%, and Laws and Regulations at 10%. Applicants pay a $120 Dental Board application fee plus a $46.59 PSI exam registration fee.

Sample RDA Practice Questions

Try these sample questions to review concepts for the RDA exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1When reviewing a patient's medical history, which condition requires the dental assistant to alert the dentist before beginning treatment?

A.Patient had a dental cleaning 6 months ago

B.Patient is taking blood thinning medication

C.Patient prefers morning appointments

D.Patient has dental insurance

Explanation: Blood thinning medications can increase bleeding risk during dental procedures. The dentist must be informed to evaluate bleeding risk and potentially adjust the treatment plan or medication schedule with the patient's physician.

2Which of the following is NOT typically included in a comprehensive dental patient history form?

A.Current medications

B.Previous surgeries

C.Employment salary history

D.Allergies to medications

Explanation: Patient employment salary information is not medically relevant and should not be included in a dental health history form. Medical conditions, medications, allergies, and previous surgeries are all essential components.

3What is the normal range for adult blood pressure?

A.90/60 to 120/80 mmHg

B.120/80 to 140/90 mmHg

C.100/70 to 130/85 mmHg

D.110/70 to 140/90 mmHg

Explanation: Normal adult blood pressure is typically considered to be between 90/60 mmHg and 120/80 mmHg. Readings above 120/80 may indicate prehypertension or hypertension, requiring dental modifications or physician referral.

4Where is the radial pulse most commonly assessed on a patient?

A.At the base of the neck

B.On the inner aspect of the wrist

C.At the temple near the ear

D.Behind the knee

Explanation: The radial pulse is located on the thumb side of the wrist, over the radial artery. This is the most common site for routine pulse assessment because it is easily accessible and requires minimal patient positioning.

5In the Universal Numbering System, which tooth is designated as tooth #8?

A.Maxillary right central incisor

B.Maxillary left central incisor

C.Mandibular right central incisor

D.Maxillary right lateral incisor

Explanation: In the Universal Numbering System, tooth #8 is the maxillary right central incisor. The system numbers teeth 1-16 for the upper arch (right to left) and 17-32 for the lower arch (left to right).

6Which charting symbol represents a missing tooth?

A.Circle around the tooth

B.X through the tooth

C.Triangle pointing down

D.Horizontal line across the tooth

Explanation: An X drawn through a tooth on a dental chart indicates that the tooth is missing. This is the standard notation used across most charting systems to denote edentulous spaces.

7During an oral examination, what color should healthy gingival tissue appear?

A.Bright red

B.Coral pink

C.Dark purple

D.Pale white

Explanation: Healthy gingival tissue typically appears coral pink in color. Redness may indicate inflammation, while pale tissue could suggest anemia or other systemic conditions.

8What instrument is commonly used to measure periodontal pocket depths?

A.Dental explorer

B.Periodontal probe

C.Curette

D.Mirror handle

Explanation: A periodontal probe is specifically designed with calibrated markings to measure pocket depths around teeth. Normal sulcus depth is 1-3 mm; depths greater than 3 mm indicate periodontal disease.

9What type of radiograph shows the entire tooth including the crown, root, and surrounding bone?

A.Bitewing

B.Periapical

C.Panoramic

D.Occlusal

Explanation: Periapical radiographs capture the entire tooth from crown to root tip, plus the surrounding periapical bone. They are essential for diagnosing abscesses, root fractures, and periapical pathology.

10Which radiographic view is primarily used to detect interproximal decay between posterior teeth?

A.Periapical

B.Bitewing

C.Panoramic

D.Cephalometric

Explanation: Bitewing radiographs are specifically designed to visualize the crowns of upper and lower posterior teeth simultaneously, making them ideal for detecting interproximal caries and monitoring bone levels.

About the RDA Exam

The California RDA Combined Written and Law and Ethics Examination validates registered dental assistant competence in assessment and diagnostic records, dental procedures, infection control and health/safety, and laws and regulations. The current Dental Board/OPES update reduced the exam to 100 scored items plus 25 pretest items while retaining the 3-hour testing time.

Exam sponsor: Dental Board of California / PSI Services. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

125 questions

Time Limit

3 hours

Passing Score

Criterion-referenced pass/fail standard

Exam / Certification Fees

$120 application + $46.59 PSI registration

Exam sponsor website

Reported exam pass rate: See monthly school statistics. The Dental Board publishes monthly RDA written examination statistics by approved school; the applicant page does not list one statewide annual pass rate. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

50%

Dental Procedures

Provisional restorations, preventive procedures, isolation techniques, materials/supplies, patient education

25%

Infection Control & Health/Safety

Hand hygiene, PPE, sterilization, disinfection, bloodborne pathogens, hazard communication

15%

Assessment & Diagnostic Records

Patient history, vital signs, oral assessment, charting, diagnostic records

10%

Laws & Regulations

Licensing requirements, scope of practice, professional conduct, ethics, HIPAA

Preparing for the RDA Exam

What You Need to Know

Passing score: Criterion-referenced pass/fail standard
Exam length: 125 questions
Time limit: 3 hours
Exam / certification fees: $120 application + $46.59 PSI registration Official sources

Using Our Practice Resources

Work through all 200 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

RDA: Suggested Study Strategy

1Focus on Dental Procedures (50%) — by far the largest domain covering restorations, preventive procedures, and isolation

2Master infection control protocols (25%): hand hygiene steps, PPE donning/doffing order, sterilization monitoring

3Know bloodborne pathogen standards and post-exposure protocols

4Study dental charting systems: Universal Numbering System, Palmer notation, and FDI notation

5Review California dental practice act: scope of practice, supervision levels, and permitted duties

6Understand HIPAA compliance requirements for dental office settings

Frequently Asked Questions

What is the RDA certification?

RDA (Registered Dental Assistant) is a California credential required to perform expanded duties as a dental assistant. It validates competency in dental procedures, infection control, patient assessment, and dental law compliance.

How many questions are on the RDA exam?

The current California RDA combined written and law/ethics exam has 125 total multiple-choice items: 100 scored items and 25 pretest items. You have 3 hours to complete the exam. It is administered by PSI after the Dental Board approves your RDA examination and licensure application.

What are the prerequisites for the RDA exam?

You must submit the Dental Board application and document one approved pathway, such as a board-approved RDA program, qualifying work experience, non-board-approved dental assisting education plus work experience, DANB CDA certification, an alternative program, a preceptorship, or qualifying California dental hygiene licensure. Depending on the pathway, required course certificates include Radiation Safety, Coronal Polishing, Pit and Fissure Sealants, Infection Control, California Dental Practice Act, and Basic Life Support.

What is the scope of practice for an RDA?

RDAs can perform expanded duties including placing provisional restorations, applying topical anesthetic, taking impressions, exposing radiographs, and performing coronal polishing under dentist supervision. Scope is defined by the Dental Board of California.

How should I prepare for the RDA exam?

Plan for 60-100 hours of study over 4-8 weeks. Focus on Dental Procedures (50%) — the largest domain by far. Also prioritize Infection Control (25%). Master sterilization protocols, hand hygiene, and PPE requirements.