1
CDA Exam Actual Exam 2026/2027 | Certified Dental
Assistant Practice Test | Accurate Solutions with Clinical
Rationales | Aligned with 2026 CODA/DAANCE Standards |
Pass Guaranteed - A+ Graded
SECTION 1: INFECTION CONTROL & OSHA STANDARDS
Q1: According to CDC guidelines, what is the minimum recommended time for handwashing
with soap and water before donning sterile gloves for surgical procedures?
A. 10 seconds
B. 30 seconds
C. 2 minutes
D. 5 minutes
Correct Answer: C
Rationale: The CDC recommends a minimum of 2 minutes of handwashing with soap and water
before surgical procedures to ensure adequate removal of transient microorganisms. Option A (10
seconds) is insufficient for surgical asepsis. Option B (30 seconds) is acceptable for routine
dental procedures but not surgical. Option D (5 minutes) exceeds the minimum requirement and
is not standard protocol. [CORRECT]
Q2: Which of the following is the appropriate method for sterilizing a dental handpiece?
A. Wiping with a surface disinfectant and storing in a clean drawer
B. Ultrasonic cleaning followed by dry heat sterilization
C. Cleaning, lubrication, and steam autoclave sterilization
D. Cold chemical sterilization for 10 minutes
Correct Answer: C
Rationale: Dental handpieces must be cleaned, lubricated according to manufacturer
specifications, and steam sterilized (autoclaved) between patients. Option A violates infection
control standards as surface disinfectants do not sterilize internal components. Option B is
incorrect because dry heat is not recommended for handpieces due to potential damage. Option
D is insufficient as cold chemical sterilization requires 6-10 hours of immersion, not 10 minutes.
[CORRECT]
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Q3: A dental assistant is exposed to blood from a patient with unknown HIV status. According to
OSHA's Bloodborne Pathogens Standard, what is the first required action?
A. Complete incident report and continue working
B. Wash exposed area with soap and water immediately
C. Begin post-exposure prophylaxis immediately
D. Wait for patient consent to test for HIV
Correct Answer: B
Rationale: Immediate washing of the exposed area with soap and water is the critical first step to
reduce viral load exposure. Option A delays essential first aid. Option C is incorrect because
post-exposure prophylaxis is initiated only after risk assessment by a healthcare provider, not
immediately. Option D violates the standard as patient testing protocols follow established
procedures without requiring immediate consent for the exposed worker's first aid. [CORRECT]
Q4: Which personal protective equipment (PPE) is required when using a dental handpiece to
remove caries?
A. Gloves and mask only
B. Gloves, mask, protective eyewear, and gown
C. Gloves and protective eyewear only
D. Mask and gown only
Correct Answer: B
Rationale: Standard precautions require gloves, mask, protective eyewear, and gown (or lab
coat) during procedures likely to generate splatter or aerosols. Option A lacks eye protection and
body coverage. Option C lacks respiratory protection and body coverage. Option D lacks hand
protection and is incomplete. [CORRECT]
Q5: What is the proper sequence for donning PPE before a dental procedure?
A. Gown → Mask → Eyewear → Gloves
B. Mask → Eyewear → Gown → Gloves
C. Gloves → Gown → Mask → Eyewear
D. Eyewear → Mask → Gloves → Gown
Correct Answer: A
Rationale: The correct sequence is gown first (to protect clothing), then mask (to protect
respiratory tract), then eyewear (to protect eyes from contamination during mask adjustment),
and finally gloves (to protect hands and ensure all other PPE is properly positioned). Options B,
CDA Exam Actual Exam 2026/2027 | Certified Dental
Assistant Practice Test | Accurate Solutions with Clinical
Rationales | Aligned with 2026 CODA/DAANCE Standards |
Pass Guaranteed - A+ Graded
SECTION 1: INFECTION CONTROL & OSHA STANDARDS
Q1: According to CDC guidelines, what is the minimum recommended time for handwashing
with soap and water before donning sterile gloves for surgical procedures?
A. 10 seconds
B. 30 seconds
C. 2 minutes
D. 5 minutes
Correct Answer: C
Rationale: The CDC recommends a minimum of 2 minutes of handwashing with soap and water
before surgical procedures to ensure adequate removal of transient microorganisms. Option A (10
seconds) is insufficient for surgical asepsis. Option B (30 seconds) is acceptable for routine
dental procedures but not surgical. Option D (5 minutes) exceeds the minimum requirement and
is not standard protocol. [CORRECT]
Q2: Which of the following is the appropriate method for sterilizing a dental handpiece?
A. Wiping with a surface disinfectant and storing in a clean drawer
B. Ultrasonic cleaning followed by dry heat sterilization
C. Cleaning, lubrication, and steam autoclave sterilization
D. Cold chemical sterilization for 10 minutes
Correct Answer: C
Rationale: Dental handpieces must be cleaned, lubricated according to manufacturer
specifications, and steam sterilized (autoclaved) between patients. Option A violates infection
control standards as surface disinfectants do not sterilize internal components. Option B is
incorrect because dry heat is not recommended for handpieces due to potential damage. Option
D is insufficient as cold chemical sterilization requires 6-10 hours of immersion, not 10 minutes.
[CORRECT]
, 2
Q3: A dental assistant is exposed to blood from a patient with unknown HIV status. According to
OSHA's Bloodborne Pathogens Standard, what is the first required action?
A. Complete incident report and continue working
B. Wash exposed area with soap and water immediately
C. Begin post-exposure prophylaxis immediately
D. Wait for patient consent to test for HIV
Correct Answer: B
Rationale: Immediate washing of the exposed area with soap and water is the critical first step to
reduce viral load exposure. Option A delays essential first aid. Option C is incorrect because
post-exposure prophylaxis is initiated only after risk assessment by a healthcare provider, not
immediately. Option D violates the standard as patient testing protocols follow established
procedures without requiring immediate consent for the exposed worker's first aid. [CORRECT]
Q4: Which personal protective equipment (PPE) is required when using a dental handpiece to
remove caries?
A. Gloves and mask only
B. Gloves, mask, protective eyewear, and gown
C. Gloves and protective eyewear only
D. Mask and gown only
Correct Answer: B
Rationale: Standard precautions require gloves, mask, protective eyewear, and gown (or lab
coat) during procedures likely to generate splatter or aerosols. Option A lacks eye protection and
body coverage. Option C lacks respiratory protection and body coverage. Option D lacks hand
protection and is incomplete. [CORRECT]
Q5: What is the proper sequence for donning PPE before a dental procedure?
A. Gown → Mask → Eyewear → Gloves
B. Mask → Eyewear → Gown → Gloves
C. Gloves → Gown → Mask → Eyewear
D. Eyewear → Mask → Gloves → Gown
Correct Answer: A
Rationale: The correct sequence is gown first (to protect clothing), then mask (to protect
respiratory tract), then eyewear (to protect eyes from contamination during mask adjustment),
and finally gloves (to protect hands and ensure all other PPE is properly positioned). Options B,
