DANB CDA Certified Dental Assistant Exam 2026 Latest
Comprehensive Study Guide with Practice Questions Dental
Assisting Review, Verified Answers, Detailed Rationales,
Success Workbook
SECTION 1: GENERAL CHAIRSIDE ASSISTING (GC) – Questions 1-40
DOMAIN: Collection and Recording of Clinical Data (Questions 1-6)
QUESTION 1
Which of the following is the correct order of the universal numbering system for
permanent teeth?
A) 1-16 for maxillary teeth, 17-32 for mandibular teeth
B) 1-16 for mandibular teeth, 17-32 for maxillary teeth
C) 1-32 starting from the maxillary right third molar to the mandibular right third
molar
D) A-T for primary teeth and 1-32 for permanent teeth
ANSWER: A) 1-16 for maxillary teeth, 17-32 for mandibular teeth
RATIONALE: In the Universal Numbering System, permanent teeth are
numbered 1 through 32. Tooth #1 is the maxillary right third molar, and numbering
continues across the maxillary arch to tooth #16 (maxillary left third molar). Tooth
#17 is the mandibular left third molar, and numbering continues across the
mandibular arch to tooth #32 (mandibular right third molar). Option B reverses the
arches. Option C is incorrect regarding the starting point. Option D describes the
Palmer notation system for primary teeth, not the Universal system.
QUESTION 2
When recording a patient's chief complaint, the dental assistant should document:
A) Only the diagnosis provided by the dentist
B) The patient's own words describing the reason for seeking care
,C) The treatment plan proposed by the dentist
D) The patient's medical history
ANSWER: B) The patient's own words describing the reason for seeking care
RATIONALE: The chief complaint should be recorded in the patient's own words
as accurately as possible. This provides an objective record of why the patient is
seeking care. Recording only the dentist's diagnosis (A) would miss the patient's
perspective. The treatment plan (C) is documented separately. The medical history
(D) is a different component of the clinical record.
QUESTION 3
Which of the following is NOT a normal component of a complete blood pressure
reading?
A) Systolic pressure
B) Diastolic pressure
C) Pulse pressure
D) Mean arterial pressure
ANSWER: D) Mean arterial pressure
RATIONALE: A complete blood pressure reading consists of systolic pressure
(the pressure during heart contraction) and diastolic pressure (the pressure during
heart relaxation). Pulse pressure (the difference between systolic and diastolic) is
derived from these values. Mean arterial pressure is a calculated value used in
some clinical settings but is not a standard component of a routine blood pressure
reading recorded in dental records.
QUESTION 4
During a preliminary examination, the dental assistant notices a patient has an
unsteady gait and poor skin turgor. These findings should be:
A) Ignored as they are not relevant to dental treatment
B) Recorded as abnormal findings in the patient's chart
C) Discussed only with the patient's family
D) Documented only if the patient complains about them
ANSWER: B) Recorded as abnormal findings in the patient's chart
,RATIONALE: During the preliminary examination, the dental assistant should
assess the patient's general physical condition, including skin, gait, and any
abnormal characteristics. These findings should be documented in the patient's
chart as they may indicate underlying health conditions that could affect dental
treatment. Ignoring such findings (A) is negligent. Discussing with family without
patient consent (C) violates confidentiality. Waiting for patient complaints (D)
misses important clinical observations.
QUESTION 5
Using the Universal Numbering System, tooth #30 is a:
A) Maxillary first molar
B) Mandibular first molar
C) Maxillary second molar
D) Mandibular second molar
ANSWER: B) Mandibular first molar
RATIONALE: In the Universal Numbering System, tooth #30 is the mandibular
right first molar. Teeth #17-32 are in the mandibular arch, with #17 being the
mandibular left third molar and #32 being the mandibular right third molar. Tooth
#30 falls in the mandibular right quadrant and is the first molar.
QUESTION 6
Which of the following tooth surfaces is located toward the midline?
A) Distal
B) Mesial
C) Buccal
D) Lingual
ANSWER: B) Mesial
RATIONALE: The mesial surface is the tooth surface that faces toward the
midline (the imaginary vertical line dividing the dental arches into right and left
halves). The distal surface (A) faces away from the midline. The buccal surface (C)
faces the cheeks. The lingual surface (D) faces the tongue.
, DOMAIN: Chairside Dental Procedures (Questions 7-21)
QUESTION 7
The primary purpose of using a dental dam during restorative procedures is to:
A) Improve patient comfort
B) Isolate the operative field and protect the patient
C) Reduce the need for local anesthesia
D) Enhance the taste of dental materials
ANSWER: B) Isolate the operative field and protect the patient
RATIONALE: The dental dam isolates the operative field by providing a dry,
clean working environment, which is essential for adhesion of restorative
materials. It also protects the patient by preventing the aspiration or ingestion of
instruments and materials. While it may improve comfort (A), this is secondary. It
does not reduce the need for anesthesia (C) or affect the taste of materials (D).
QUESTION 8
The high-volume evacuator (HVE) is primarily used to:
A) Remove saliva from the floor of the mouth
B) Control aerosols and remove fluids during high-speed procedures
C) Provide oxygen to the patient
D) Deliver water to the tooth surface
ANSWER: B) Control aerosols and remove fluids during high-speed
procedures
RATIONALE: The high-volume evacuator (HVE) is used to control aerosols and
remove fluids, water, and debris during high-speed procedures such as tooth
preparation. It is operated by the dental assistant. The saliva ejector (A) is a low-
volume suction device used for moisture control. The HVE does not provide
oxygen (C) or deliver water (D).
Comprehensive Study Guide with Practice Questions Dental
Assisting Review, Verified Answers, Detailed Rationales,
Success Workbook
SECTION 1: GENERAL CHAIRSIDE ASSISTING (GC) – Questions 1-40
DOMAIN: Collection and Recording of Clinical Data (Questions 1-6)
QUESTION 1
Which of the following is the correct order of the universal numbering system for
permanent teeth?
A) 1-16 for maxillary teeth, 17-32 for mandibular teeth
B) 1-16 for mandibular teeth, 17-32 for maxillary teeth
C) 1-32 starting from the maxillary right third molar to the mandibular right third
molar
D) A-T for primary teeth and 1-32 for permanent teeth
ANSWER: A) 1-16 for maxillary teeth, 17-32 for mandibular teeth
RATIONALE: In the Universal Numbering System, permanent teeth are
numbered 1 through 32. Tooth #1 is the maxillary right third molar, and numbering
continues across the maxillary arch to tooth #16 (maxillary left third molar). Tooth
#17 is the mandibular left third molar, and numbering continues across the
mandibular arch to tooth #32 (mandibular right third molar). Option B reverses the
arches. Option C is incorrect regarding the starting point. Option D describes the
Palmer notation system for primary teeth, not the Universal system.
QUESTION 2
When recording a patient's chief complaint, the dental assistant should document:
A) Only the diagnosis provided by the dentist
B) The patient's own words describing the reason for seeking care
,C) The treatment plan proposed by the dentist
D) The patient's medical history
ANSWER: B) The patient's own words describing the reason for seeking care
RATIONALE: The chief complaint should be recorded in the patient's own words
as accurately as possible. This provides an objective record of why the patient is
seeking care. Recording only the dentist's diagnosis (A) would miss the patient's
perspective. The treatment plan (C) is documented separately. The medical history
(D) is a different component of the clinical record.
QUESTION 3
Which of the following is NOT a normal component of a complete blood pressure
reading?
A) Systolic pressure
B) Diastolic pressure
C) Pulse pressure
D) Mean arterial pressure
ANSWER: D) Mean arterial pressure
RATIONALE: A complete blood pressure reading consists of systolic pressure
(the pressure during heart contraction) and diastolic pressure (the pressure during
heart relaxation). Pulse pressure (the difference between systolic and diastolic) is
derived from these values. Mean arterial pressure is a calculated value used in
some clinical settings but is not a standard component of a routine blood pressure
reading recorded in dental records.
QUESTION 4
During a preliminary examination, the dental assistant notices a patient has an
unsteady gait and poor skin turgor. These findings should be:
A) Ignored as they are not relevant to dental treatment
B) Recorded as abnormal findings in the patient's chart
C) Discussed only with the patient's family
D) Documented only if the patient complains about them
ANSWER: B) Recorded as abnormal findings in the patient's chart
,RATIONALE: During the preliminary examination, the dental assistant should
assess the patient's general physical condition, including skin, gait, and any
abnormal characteristics. These findings should be documented in the patient's
chart as they may indicate underlying health conditions that could affect dental
treatment. Ignoring such findings (A) is negligent. Discussing with family without
patient consent (C) violates confidentiality. Waiting for patient complaints (D)
misses important clinical observations.
QUESTION 5
Using the Universal Numbering System, tooth #30 is a:
A) Maxillary first molar
B) Mandibular first molar
C) Maxillary second molar
D) Mandibular second molar
ANSWER: B) Mandibular first molar
RATIONALE: In the Universal Numbering System, tooth #30 is the mandibular
right first molar. Teeth #17-32 are in the mandibular arch, with #17 being the
mandibular left third molar and #32 being the mandibular right third molar. Tooth
#30 falls in the mandibular right quadrant and is the first molar.
QUESTION 6
Which of the following tooth surfaces is located toward the midline?
A) Distal
B) Mesial
C) Buccal
D) Lingual
ANSWER: B) Mesial
RATIONALE: The mesial surface is the tooth surface that faces toward the
midline (the imaginary vertical line dividing the dental arches into right and left
halves). The distal surface (A) faces away from the midline. The buccal surface (C)
faces the cheeks. The lingual surface (D) faces the tongue.
, DOMAIN: Chairside Dental Procedures (Questions 7-21)
QUESTION 7
The primary purpose of using a dental dam during restorative procedures is to:
A) Improve patient comfort
B) Isolate the operative field and protect the patient
C) Reduce the need for local anesthesia
D) Enhance the taste of dental materials
ANSWER: B) Isolate the operative field and protect the patient
RATIONALE: The dental dam isolates the operative field by providing a dry,
clean working environment, which is essential for adhesion of restorative
materials. It also protects the patient by preventing the aspiration or ingestion of
instruments and materials. While it may improve comfort (A), this is secondary. It
does not reduce the need for anesthesia (C) or affect the taste of materials (D).
QUESTION 8
The high-volume evacuator (HVE) is primarily used to:
A) Remove saliva from the floor of the mouth
B) Control aerosols and remove fluids during high-speed procedures
C) Provide oxygen to the patient
D) Deliver water to the tooth surface
ANSWER: B) Control aerosols and remove fluids during high-speed
procedures
RATIONALE: The high-volume evacuator (HVE) is used to control aerosols and
remove fluids, water, and debris during high-speed procedures such as tooth
preparation. It is operated by the dental assistant. The saliva ejector (A) is a low-
volume suction device used for moisture control. The HVE does not provide
oxygen (C) or deliver water (D).
