CERTIFIED DENTAL ASSISTANT (CDA) EXAM PREP 2026
Latest Comprehensive Study Guide with Practice
Questions, Comprehensive Dental Assisting Certification
Review, Detailed Explanations, Verified Answers,
Complete Success Workbook
SECTION 1: GENERAL CHAIRSIDE ASSISTING (GC) — Questions 1-50
This section covers dental anatomy, four-handed dentistry, instrument
identification, dental materials, impressions, patient management, vital signs,
medical emergencies, and treatment documentation.
Question 1
A dental assistant is preparing the treatment room for a restorative
procedure. Which of the following should be done FIRST?
A) Set up the instrument tray
B) Position the dental chair
C) Prepare the treatment room by ensuring all surfaces are clean and barriers
are in place
D) Greet the patient and escort them to the room
Correct Answer: C
Rationale: The first step in preparing the treatment room is to ensure all
surfaces are clean and barriers are in place to maintain infection control.
Setting up the instrument tray (A) and positioning the chair (B) are part of
room preparation but should follow surface preparation. Greeting the patient
(D) occurs after the room is ready.
Question 2
,According to the Universal Numbering System, which tooth number
corresponds to the maxillary right first molar?
A) #1
B) #2
C) #3
D) #14
E) #30
Correct Answer: C
Rationale: In the Universal Numbering System, tooth #1 is the maxillary right
third molar, #2 is the maxillary right second molar, and #3 is the maxillary
right first molar. Option A is the third molar, B is the second molar, D (#14) is
the maxillary left first molar, and E (#30) is the mandibular right first molar.
Question 3
Which of the following instruments is used to remove decay from a cavity
preparation?
A) Amalgam carrier
B) Excavator
C) Explorer
D) Burnisher
E) Carver
Correct Answer: B
Rationale: An excavator (spoon excavator) is used to remove decay (carious
dentin) from a cavity preparation. An amalgam carrier (A) is used to place
amalgam. An explorer (C) is used to detect caries and calculus. A burnisher
(D) is used to polish and adapt restorations. A carver (E) is used to carve
amalgam restorations.
,Question 4
A patient presents with a blood pressure reading of 145/92 mmHg. The dental
assistant should:
A) Proceed with treatment as scheduled
B) Record the reading and notify the dentist
C) Send the patient home immediately
D) Ask the patient to take deep breaths and recheck in 5 minutes
E) Administer antihypertensive medication
Correct Answer: B
Rationale: A blood pressure reading of 145/92 mmHg is elevated (Stage 1
hypertension). The dental assistant should record the reading and notify the
dentist. Proceeding without notification (A) is inappropriate. Sending the
patient home (C) is premature. Rechecking (D) may be done but after
notifying the dentist. Administering medication (E) is outside the dental
assistant's scope of practice.
Question 5
Which of the following is the correct sequence for seating a patient?
A) Greet patient, position dental chair, adjust headrest, place napkin, ask
about medical history
B) Greet patient, ask about medical history, position dental chair, adjust
headrest, place napkin
C) Position dental chair, greet patient, adjust headrest, place napkin, ask about
medical history
D) Place napkin, greet patient, ask about medical history, position dental
chair, adjust headrest
E) Adjust headrest, greet patient, ask about medical history, position dental
chair, place napkin
Correct Answer: B
, Rationale: The correct sequence is: greet the patient, ask about medical
history (updates/changes), position the dental chair, adjust the headrest, and
place the napkin. This ensures patient comfort and safety. Options A, C, D, and
E present incorrect sequences.
Question 6
In four-handed dentistry, the dental assistant's operating zone for a right-
handed dentist is typically:
A) 7 to 9 o'clock position
B) 9 to 11 o'clock position
C) 2 to 4 o'clock position
D) 11 to 1 o'clock position
E) 4 to 6 o'clock position
Correct Answer: A
Rationale: For a right-handed dentist, the dental assistant typically operates
from the 7 to 9 o'clock position (right side of the patient). The dentist operates
from the 11 to 1 o'clock position. Options B, C, D, and E describe other
positions used for different procedures or operatories.
Question 7
Which of the following is the correct instrument transfer technique in four-
handed dentistry?
A) The assistant passes the instrument over the patient's face
B) The assistant passes the instrument under the patient's chin
C) The assistant passes the instrument over the patient's chest
D) The assistant places the instrument on the tray and the dentist picks it up
E) The assistant passes the instrument through the patient's mouth
Correct Answer: C
Latest Comprehensive Study Guide with Practice
Questions, Comprehensive Dental Assisting Certification
Review, Detailed Explanations, Verified Answers,
Complete Success Workbook
SECTION 1: GENERAL CHAIRSIDE ASSISTING (GC) — Questions 1-50
This section covers dental anatomy, four-handed dentistry, instrument
identification, dental materials, impressions, patient management, vital signs,
medical emergencies, and treatment documentation.
Question 1
A dental assistant is preparing the treatment room for a restorative
procedure. Which of the following should be done FIRST?
A) Set up the instrument tray
B) Position the dental chair
C) Prepare the treatment room by ensuring all surfaces are clean and barriers
are in place
D) Greet the patient and escort them to the room
Correct Answer: C
Rationale: The first step in preparing the treatment room is to ensure all
surfaces are clean and barriers are in place to maintain infection control.
Setting up the instrument tray (A) and positioning the chair (B) are part of
room preparation but should follow surface preparation. Greeting the patient
(D) occurs after the room is ready.
Question 2
,According to the Universal Numbering System, which tooth number
corresponds to the maxillary right first molar?
A) #1
B) #2
C) #3
D) #14
E) #30
Correct Answer: C
Rationale: In the Universal Numbering System, tooth #1 is the maxillary right
third molar, #2 is the maxillary right second molar, and #3 is the maxillary
right first molar. Option A is the third molar, B is the second molar, D (#14) is
the maxillary left first molar, and E (#30) is the mandibular right first molar.
Question 3
Which of the following instruments is used to remove decay from a cavity
preparation?
A) Amalgam carrier
B) Excavator
C) Explorer
D) Burnisher
E) Carver
Correct Answer: B
Rationale: An excavator (spoon excavator) is used to remove decay (carious
dentin) from a cavity preparation. An amalgam carrier (A) is used to place
amalgam. An explorer (C) is used to detect caries and calculus. A burnisher
(D) is used to polish and adapt restorations. A carver (E) is used to carve
amalgam restorations.
,Question 4
A patient presents with a blood pressure reading of 145/92 mmHg. The dental
assistant should:
A) Proceed with treatment as scheduled
B) Record the reading and notify the dentist
C) Send the patient home immediately
D) Ask the patient to take deep breaths and recheck in 5 minutes
E) Administer antihypertensive medication
Correct Answer: B
Rationale: A blood pressure reading of 145/92 mmHg is elevated (Stage 1
hypertension). The dental assistant should record the reading and notify the
dentist. Proceeding without notification (A) is inappropriate. Sending the
patient home (C) is premature. Rechecking (D) may be done but after
notifying the dentist. Administering medication (E) is outside the dental
assistant's scope of practice.
Question 5
Which of the following is the correct sequence for seating a patient?
A) Greet patient, position dental chair, adjust headrest, place napkin, ask
about medical history
B) Greet patient, ask about medical history, position dental chair, adjust
headrest, place napkin
C) Position dental chair, greet patient, adjust headrest, place napkin, ask about
medical history
D) Place napkin, greet patient, ask about medical history, position dental
chair, adjust headrest
E) Adjust headrest, greet patient, ask about medical history, position dental
chair, place napkin
Correct Answer: B
, Rationale: The correct sequence is: greet the patient, ask about medical
history (updates/changes), position the dental chair, adjust the headrest, and
place the napkin. This ensures patient comfort and safety. Options A, C, D, and
E present incorrect sequences.
Question 6
In four-handed dentistry, the dental assistant's operating zone for a right-
handed dentist is typically:
A) 7 to 9 o'clock position
B) 9 to 11 o'clock position
C) 2 to 4 o'clock position
D) 11 to 1 o'clock position
E) 4 to 6 o'clock position
Correct Answer: A
Rationale: For a right-handed dentist, the dental assistant typically operates
from the 7 to 9 o'clock position (right side of the patient). The dentist operates
from the 11 to 1 o'clock position. Options B, C, D, and E describe other
positions used for different procedures or operatories.
Question 7
Which of the following is the correct instrument transfer technique in four-
handed dentistry?
A) The assistant passes the instrument over the patient's face
B) The assistant passes the instrument under the patient's chin
C) The assistant passes the instrument over the patient's chest
D) The assistant places the instrument on the tray and the dentist picks it up
E) The assistant passes the instrument through the patient's mouth
Correct Answer: C
