RHS EXAM PRACTICE EXAM AND STUDY GUIDE
300+ QUESTIONS AND CORRECT ANSWERS (ALREADY GRADED
A+) | LATEST EDITION
DOMAIN 1: PURPOSE AND TECHNIQUE
Section 1.1: Image Types and Purposes
Question 1
Which radiographic view is specifically designed to show the crowns
and alveolar bone levels of both maxillary and mandibular teeth on a
single image?
A) Periapical
B) Panoramic
C) Bitewing
D) Occlusal
E) Cephalometric
Correct Answer: C) Bitewing
Rationale: Bitewing radiographs are primarily used for detecting
interproximal caries and evaluating alveolar bone levels. They show the
crowns and coronal thirds of both upper and lower teeth
simultaneously .
Question 2
Which radiographic image is BEST for evaluating the entire tooth from
crown to apex, including surrounding bone and the root apex?
A) Bitewing
B) Panoramic
C) Periapical
,D) Occlusal
E) Cephalometric
Correct Answer: C) Periapical
Rationale: Periapical images are essential for evaluating the health of
the root apex and the surrounding supportive structures, including the
periodontal ligament and alveolar bone .
Question 3
A full mouth series (FMS) typically consists of which combination of
images?
A) 8 bitewings and 10 periapicals
B) 4 bitewings and 6 periapicals
C) 14 periapicals and 4 bitewings
D) 18 periapicals only
E) 2 panoramic and 4 bitewings
Correct Answer: C) 14 periapicals and 4 bitewings
Rationale: A complete FMS for an adult usually includes 14 periapical
views (7 per arch) and 4 bitewing views (2 per side), totaling 18 images.
Question 4
Which of the following is the PRIMARY purpose of an occlusal
radiograph?
A) To detect interproximal caries
B) To evaluate root apices
C) To image large areas of the maxilla or mandible
D) To assess temporomandibular joint function
E) To evaluate soft tissue contours
Correct Answer: C) To image large areas of the maxilla or mandible
Rationale: Occlusal radiographs are used to image large areas of the
,maxilla or mandible, including the palate or floor of the mouth, and can
reveal unerupted teeth, cysts, or fractures .
Question 5
A panoramic radiograph is BEST described as:
A) An intraoral view of 2-3 teeth
B) An extraoral view showing the entire dentition and surrounding
structures
C) A view specifically for interproximal caries detection
D) A view for evaluating the TMJ only
E) A view for determining pulp health
Correct Answer: B) An extraoral view showing the entire dentition and
surrounding structures
Rationale: Panoramic radiography provides a broad extraoral view of
the entire maxilla and mandible, including the dentition, sinuses, and
TMJs, in a single image .
Question 6
Cephalometric radiographs are primarily used for:
A) Endodontic evaluation
B) Caries detection
C) Orthodontic treatment planning and growth assessment
D) Periodontal disease evaluation
E) Implant placement
Correct Answer: C) Orthodontic treatment planning and growth
assessment
Rationale: Cephalometric radiographs are standardized extraoral views
used in orthodontics to assess skeletal relationships, growth patterns,
and for treatment planning .
, Question 7
Cone Beam Computed Tomography (CBCT) in dentistry provides:
A) Two-dimensional images of teeth
B) Three-dimensional images of maxillofacial structures
C) Four-dimensional imaging for TMJ
D) Only soft tissue imaging
E) Radiation-free imaging
Correct Answer: B) Three-dimensional images of maxillofacial
structures
Rationale: CBCT provides 3D imaging of the maxillofacial region, useful
for implant planning, impacted tooth assessment, and evaluating
pathologies .
Section 1.2: Radiographic Technique (Paralleling vs. Bisecting)
Question 8
The paralleling technique requires which of the following to be parallel?
A) The patient's head and the x-ray tubehead
B) The image receptor and the long axis of the tooth
C) The x-ray beam and the tooth
D) The image receptor and the floor
E) The film and the x-ray tubehead
Correct Answer: B) The image receptor and the long axis of the tooth
Rationale: In the paralleling technique, the receptor is placed parallel to
the long axis of the tooth, and the central ray is directed perpendicular
to both.
Question 9
Which of the following is the PRIMARY advantage of the paralleling
300+ QUESTIONS AND CORRECT ANSWERS (ALREADY GRADED
A+) | LATEST EDITION
DOMAIN 1: PURPOSE AND TECHNIQUE
Section 1.1: Image Types and Purposes
Question 1
Which radiographic view is specifically designed to show the crowns
and alveolar bone levels of both maxillary and mandibular teeth on a
single image?
A) Periapical
B) Panoramic
C) Bitewing
D) Occlusal
E) Cephalometric
Correct Answer: C) Bitewing
Rationale: Bitewing radiographs are primarily used for detecting
interproximal caries and evaluating alveolar bone levels. They show the
crowns and coronal thirds of both upper and lower teeth
simultaneously .
Question 2
Which radiographic image is BEST for evaluating the entire tooth from
crown to apex, including surrounding bone and the root apex?
A) Bitewing
B) Panoramic
C) Periapical
,D) Occlusal
E) Cephalometric
Correct Answer: C) Periapical
Rationale: Periapical images are essential for evaluating the health of
the root apex and the surrounding supportive structures, including the
periodontal ligament and alveolar bone .
Question 3
A full mouth series (FMS) typically consists of which combination of
images?
A) 8 bitewings and 10 periapicals
B) 4 bitewings and 6 periapicals
C) 14 periapicals and 4 bitewings
D) 18 periapicals only
E) 2 panoramic and 4 bitewings
Correct Answer: C) 14 periapicals and 4 bitewings
Rationale: A complete FMS for an adult usually includes 14 periapical
views (7 per arch) and 4 bitewing views (2 per side), totaling 18 images.
Question 4
Which of the following is the PRIMARY purpose of an occlusal
radiograph?
A) To detect interproximal caries
B) To evaluate root apices
C) To image large areas of the maxilla or mandible
D) To assess temporomandibular joint function
E) To evaluate soft tissue contours
Correct Answer: C) To image large areas of the maxilla or mandible
Rationale: Occlusal radiographs are used to image large areas of the
,maxilla or mandible, including the palate or floor of the mouth, and can
reveal unerupted teeth, cysts, or fractures .
Question 5
A panoramic radiograph is BEST described as:
A) An intraoral view of 2-3 teeth
B) An extraoral view showing the entire dentition and surrounding
structures
C) A view specifically for interproximal caries detection
D) A view for evaluating the TMJ only
E) A view for determining pulp health
Correct Answer: B) An extraoral view showing the entire dentition and
surrounding structures
Rationale: Panoramic radiography provides a broad extraoral view of
the entire maxilla and mandible, including the dentition, sinuses, and
TMJs, in a single image .
Question 6
Cephalometric radiographs are primarily used for:
A) Endodontic evaluation
B) Caries detection
C) Orthodontic treatment planning and growth assessment
D) Periodontal disease evaluation
E) Implant placement
Correct Answer: C) Orthodontic treatment planning and growth
assessment
Rationale: Cephalometric radiographs are standardized extraoral views
used in orthodontics to assess skeletal relationships, growth patterns,
and for treatment planning .
, Question 7
Cone Beam Computed Tomography (CBCT) in dentistry provides:
A) Two-dimensional images of teeth
B) Three-dimensional images of maxillofacial structures
C) Four-dimensional imaging for TMJ
D) Only soft tissue imaging
E) Radiation-free imaging
Correct Answer: B) Three-dimensional images of maxillofacial
structures
Rationale: CBCT provides 3D imaging of the maxillofacial region, useful
for implant planning, impacted tooth assessment, and evaluating
pathologies .
Section 1.2: Radiographic Technique (Paralleling vs. Bisecting)
Question 8
The paralleling technique requires which of the following to be parallel?
A) The patient's head and the x-ray tubehead
B) The image receptor and the long axis of the tooth
C) The x-ray beam and the tooth
D) The image receptor and the floor
E) The film and the x-ray tubehead
Correct Answer: B) The image receptor and the long axis of the tooth
Rationale: In the paralleling technique, the receptor is placed parallel to
the long axis of the tooth, and the central ray is directed perpendicular
to both.
Question 9
Which of the following is the PRIMARY advantage of the paralleling
