ADAA X-Ray Exam: Complete Practice Question Bank
SECTION 1: RADIOGRAPH IDENTIFICATION & TECHNIQUE
Question 1
What type of radiograph is used to show the entire crowns and supporting bone structures
of the teeth in a specific arch?
A) Bitewing (BW)
B) Periapical (PA)
C) Panorex (PANO)
D) Cephalometric
Answer: B) Periapical (PA)
Rationale: Periapical radiographs show the entire tooth from crown to approximately 2-3
mm beyond the apex, including the surrounding bone. This allows visualization of the root
structures, periapical pathology, and supporting bone. The name "periapical" literally means
"around the apex."
Question 2
Which radiographic view captures both the upper and lower teeth in occlusion and is
primarily used to detect interproximal caries?
A) Periapical
B) Panorex
C) Bitewing
D) Occlusal
Answer: C) Bitewing
Rationale: Bitewing radiographs (BW or BWX) show the crowns of both maxillary and
mandibular teeth in one image and are specifically designed to detect interproximal
(between teeth) caries. They are most commonly positioned horizontally.
Question 3
What type of image receptor exposure provides a broad, overall view of the entire dentition,
including the maxillary sinuses and temporomandibular joints?
A) Full Mouth Series (FMX)
,B) Panorex
C) Periapical
D) Cephalometric
Answer: B) Panorex
Rationale: A Panorex (panoramic radiograph) provides a comprehensive extraoral view of
the entire dentition, both jaws, maxillary sinuses, nasal cavity, and mandibular nerve canal in
a single image. It is invaluable for initial assessment and evaluating trauma or pathology.
Question 4
A complete Full Mouth Series (FMX) typically consists of how many individual x-ray
exposures?
A) 12
B) 14
C) 16
D) 18
Answer: D) 18
Rationale: A standard Full Mouth Series (FMX) typically consists of 18 images: 4 bitewings
and 14 periapicals (8 posterior and 6 anterior). This provides comprehensive coverage of all
teeth and their supporting structures.
Question 5
Which position is used for anterior periapical radiographs?
A) Horizontal
B) Vertical
C) Diagonal
D) Perpendicular
Answer: B) Vertical
Rationale: Anterior periapical radiographs are taken with a vertical orientation (the receptor
is positioned vertically) because anterior teeth are narrow and vertically aligned. Posterior
periapicals are taken horizontally to capture the wider posterior tooth anatomy.
Question 6
Which position is used for posterior periapical radiographs?
A) Horizontal
B) Vertical
,C) Diagonal
D) Perpendicular
Answer: A) Horizontal
Rationale: Posterior periapical radiographs are taken with a horizontal orientation because
posterior teeth are wider mesiodistally and the horizontal orientation captures more of the
tooth structure and surrounding bone.
Question 7
What is the primary purpose of a bitewing radiograph?
A) Evaluate root morphology
B) Detect interproximal caries
C) Assess periapical pathology
D) Evaluate TMJ disorders
Answer: B) Detect interproximal caries
Rationale: Bitewing radiographs are specifically designed to detect interproximal caries
(decay between teeth). They show the crowns of both maxillary and mandibular teeth in
occlusion, making them ideal for detecting caries that are not visible clinically.
Question 8
Which radiographic technique is used to evaluate the temporomandibular joint (TMJ)?
A) Periapical
B) Bitewing
C) Panoramic
D) Cephalometric
Answer: C) Panoramic
Rationale: Panoramic radiographs (Panorex) provide visualization of the temporomandibular
joints (TMJs) bilaterally. They allow assessment of the condylar heads and the joint spaces,
although specialized TMJ views may be needed for detailed evaluation.
Question 9
A cephalometric radiograph is primarily used for:
A) Caries detection
B) Orthodontic treatment planning
C) Periapical pathology assessment
D) Periodontal evaluation
, Answer: B) Orthodontic treatment planning
Rationale: Cephalometric radiographs are used extensively in orthodontic treatment
planning. They provide a lateral (profile) view of the skull, allowing measurement of cranial
and facial structures to assess growth patterns and plan orthodontic treatment.
Question 10
What is the purpose of an occlusal radiograph?
A) Detect interproximal caries
B) Evaluate the entire arch from a perpendicular view
C) Assess root morphology
D) Evaluate TMJ disorders
Answer: B) Evaluate the entire arch from a perpendicular view
Rationale: Occlusal radiographs provide a view of the entire arch from a perpendicular (top-
down) perspective. They are used to evaluate the palate, floor of the mouth, and to locate
retained roots, supernumerary teeth, or foreign bodies.
Question 11
The paralleling technique requires the film/sensor to be placed:
A) Parallel to the long axis of the tooth
B) Perpendicular to the long axis of the tooth
C) At a 45-degree angle to the tooth
D) Parallel to the floor
Answer: A) Parallel to the long axis of the tooth
Rationale: In the paralleling technique, the film/sensor is placed parallel to the long axis of
the tooth being radiographed. This technique minimizes geometric distortion and produces
images with accurate anatomical representation.
Question 12
The bisecting angle technique requires the film/sensor to be placed:
A) Parallel to the long axis of the tooth
B) Perpendicular to the long axis of the tooth
C) At a 90-degree angle to the tooth
D) At an angle determined by the bisector of the angle formed by the tooth and the film
SECTION 1: RADIOGRAPH IDENTIFICATION & TECHNIQUE
Question 1
What type of radiograph is used to show the entire crowns and supporting bone structures
of the teeth in a specific arch?
A) Bitewing (BW)
B) Periapical (PA)
C) Panorex (PANO)
D) Cephalometric
Answer: B) Periapical (PA)
Rationale: Periapical radiographs show the entire tooth from crown to approximately 2-3
mm beyond the apex, including the surrounding bone. This allows visualization of the root
structures, periapical pathology, and supporting bone. The name "periapical" literally means
"around the apex."
Question 2
Which radiographic view captures both the upper and lower teeth in occlusion and is
primarily used to detect interproximal caries?
A) Periapical
B) Panorex
C) Bitewing
D) Occlusal
Answer: C) Bitewing
Rationale: Bitewing radiographs (BW or BWX) show the crowns of both maxillary and
mandibular teeth in one image and are specifically designed to detect interproximal
(between teeth) caries. They are most commonly positioned horizontally.
Question 3
What type of image receptor exposure provides a broad, overall view of the entire dentition,
including the maxillary sinuses and temporomandibular joints?
A) Full Mouth Series (FMX)
,B) Panorex
C) Periapical
D) Cephalometric
Answer: B) Panorex
Rationale: A Panorex (panoramic radiograph) provides a comprehensive extraoral view of
the entire dentition, both jaws, maxillary sinuses, nasal cavity, and mandibular nerve canal in
a single image. It is invaluable for initial assessment and evaluating trauma or pathology.
Question 4
A complete Full Mouth Series (FMX) typically consists of how many individual x-ray
exposures?
A) 12
B) 14
C) 16
D) 18
Answer: D) 18
Rationale: A standard Full Mouth Series (FMX) typically consists of 18 images: 4 bitewings
and 14 periapicals (8 posterior and 6 anterior). This provides comprehensive coverage of all
teeth and their supporting structures.
Question 5
Which position is used for anterior periapical radiographs?
A) Horizontal
B) Vertical
C) Diagonal
D) Perpendicular
Answer: B) Vertical
Rationale: Anterior periapical radiographs are taken with a vertical orientation (the receptor
is positioned vertically) because anterior teeth are narrow and vertically aligned. Posterior
periapicals are taken horizontally to capture the wider posterior tooth anatomy.
Question 6
Which position is used for posterior periapical radiographs?
A) Horizontal
B) Vertical
,C) Diagonal
D) Perpendicular
Answer: A) Horizontal
Rationale: Posterior periapical radiographs are taken with a horizontal orientation because
posterior teeth are wider mesiodistally and the horizontal orientation captures more of the
tooth structure and surrounding bone.
Question 7
What is the primary purpose of a bitewing radiograph?
A) Evaluate root morphology
B) Detect interproximal caries
C) Assess periapical pathology
D) Evaluate TMJ disorders
Answer: B) Detect interproximal caries
Rationale: Bitewing radiographs are specifically designed to detect interproximal caries
(decay between teeth). They show the crowns of both maxillary and mandibular teeth in
occlusion, making them ideal for detecting caries that are not visible clinically.
Question 8
Which radiographic technique is used to evaluate the temporomandibular joint (TMJ)?
A) Periapical
B) Bitewing
C) Panoramic
D) Cephalometric
Answer: C) Panoramic
Rationale: Panoramic radiographs (Panorex) provide visualization of the temporomandibular
joints (TMJs) bilaterally. They allow assessment of the condylar heads and the joint spaces,
although specialized TMJ views may be needed for detailed evaluation.
Question 9
A cephalometric radiograph is primarily used for:
A) Caries detection
B) Orthodontic treatment planning
C) Periapical pathology assessment
D) Periodontal evaluation
, Answer: B) Orthodontic treatment planning
Rationale: Cephalometric radiographs are used extensively in orthodontic treatment
planning. They provide a lateral (profile) view of the skull, allowing measurement of cranial
and facial structures to assess growth patterns and plan orthodontic treatment.
Question 10
What is the purpose of an occlusal radiograph?
A) Detect interproximal caries
B) Evaluate the entire arch from a perpendicular view
C) Assess root morphology
D) Evaluate TMJ disorders
Answer: B) Evaluate the entire arch from a perpendicular view
Rationale: Occlusal radiographs provide a view of the entire arch from a perpendicular (top-
down) perspective. They are used to evaluate the palate, floor of the mouth, and to locate
retained roots, supernumerary teeth, or foreign bodies.
Question 11
The paralleling technique requires the film/sensor to be placed:
A) Parallel to the long axis of the tooth
B) Perpendicular to the long axis of the tooth
C) At a 45-degree angle to the tooth
D) Parallel to the floor
Answer: A) Parallel to the long axis of the tooth
Rationale: In the paralleling technique, the film/sensor is placed parallel to the long axis of
the tooth being radiographed. This technique minimizes geometric distortion and produces
images with accurate anatomical representation.
Question 12
The bisecting angle technique requires the film/sensor to be placed:
A) Parallel to the long axis of the tooth
B) Perpendicular to the long axis of the tooth
C) At a 90-degree angle to the tooth
D) At an angle determined by the bisector of the angle formed by the tooth and the film
