DANBs Orthodontic Assisting (OA)
Exam
Question 1. Which craniofacial bone is primarily involved in forming the
palate and the nasal cavity floor?
A) Maxilla
B) Palatine
C) Ethmoid
D) Vomer
Answer: A
Explanation: The maxilla is the main bone forming the upper jaw, palate,
and part of the nasal cavity floor, playing a crucial role in craniofacial
structure and occlusion.
Question 2. Which muscle is primarily responsible for elevating the
mandible during mastication?
A) Temporalis
B) Masseter
C) Medial pterygoid
D) Lateral pterygoid
,DANBs Orthodontic Assisting (OA)
Exam
Answer: B
Explanation: The masseter muscle is a powerful elevator of the
mandible, essential for biting and chewing functions.
Question 3. The temporomandibular joint (TMJ) is classified as which
type of synovial joint?
A) Hinge joint
B) Condyloid joint
C) Plane joint
D) Ball-and-socket joint
Answer: B
Explanation: The TMJ is a condyloid joint allowing movement in multiple
planes, including opening, closing, and lateral excursions.
Question 4. Which of the following describes Angle's Class I occlusion?
A) Molar relationship where mesiobuccal cusp of maxillary first molar
,DANBs Orthodontic Assisting (OA)
Exam
aligns with the mesiobuccal groove of mandibular first molar
B) Molar relationship where maxillary molar is distal to mandibular
molar
C) Molar relationship where mandibular first molar is advanced
anteriorly
D) Molar relationship with crossbite
Answer: A
Explanation: Class I occlusion is characterized by a normal molar
relationship where the maxillary first molar's mesiobuccal cusp aligns
with the mandibular first molar's mesiobuccal groove.
Question 5. Which environmental factor is most associated with the
development of malocclusion?
A) Genetic mutations
B) Thumb sucking
C) Craniosynostosis
D) Congenital syphilis
, DANBs Orthodontic Assisting (OA)
Exam
Answer: B
Explanation: Habits like thumb sucking exert functional pressure that
can alter normal growth patterns, leading to malocclusion.
Question 6. During orthodontic growth, which craniofacial structure
continues to develop into late adolescence?
A) Maxilla
B) Mandible
C) Nasal bones
D) Zygomatic arch
Answer: B
Explanation: The mandible continues to grow into late adolescence due
to its endochondral growth, affecting occlusion and facial profile.
Question 7. Which biomechanical principle is utilized when applying
light, continuous forces to move teeth orthodontically?
Exam
Question 1. Which craniofacial bone is primarily involved in forming the
palate and the nasal cavity floor?
A) Maxilla
B) Palatine
C) Ethmoid
D) Vomer
Answer: A
Explanation: The maxilla is the main bone forming the upper jaw, palate,
and part of the nasal cavity floor, playing a crucial role in craniofacial
structure and occlusion.
Question 2. Which muscle is primarily responsible for elevating the
mandible during mastication?
A) Temporalis
B) Masseter
C) Medial pterygoid
D) Lateral pterygoid
,DANBs Orthodontic Assisting (OA)
Exam
Answer: B
Explanation: The masseter muscle is a powerful elevator of the
mandible, essential for biting and chewing functions.
Question 3. The temporomandibular joint (TMJ) is classified as which
type of synovial joint?
A) Hinge joint
B) Condyloid joint
C) Plane joint
D) Ball-and-socket joint
Answer: B
Explanation: The TMJ is a condyloid joint allowing movement in multiple
planes, including opening, closing, and lateral excursions.
Question 4. Which of the following describes Angle's Class I occlusion?
A) Molar relationship where mesiobuccal cusp of maxillary first molar
,DANBs Orthodontic Assisting (OA)
Exam
aligns with the mesiobuccal groove of mandibular first molar
B) Molar relationship where maxillary molar is distal to mandibular
molar
C) Molar relationship where mandibular first molar is advanced
anteriorly
D) Molar relationship with crossbite
Answer: A
Explanation: Class I occlusion is characterized by a normal molar
relationship where the maxillary first molar's mesiobuccal cusp aligns
with the mandibular first molar's mesiobuccal groove.
Question 5. Which environmental factor is most associated with the
development of malocclusion?
A) Genetic mutations
B) Thumb sucking
C) Craniosynostosis
D) Congenital syphilis
, DANBs Orthodontic Assisting (OA)
Exam
Answer: B
Explanation: Habits like thumb sucking exert functional pressure that
can alter normal growth patterns, leading to malocclusion.
Question 6. During orthodontic growth, which craniofacial structure
continues to develop into late adolescence?
A) Maxilla
B) Mandible
C) Nasal bones
D) Zygomatic arch
Answer: B
Explanation: The mandible continues to grow into late adolescence due
to its endochondral growth, affecting occlusion and facial profile.
Question 7. Which biomechanical principle is utilized when applying
light, continuous forces to move teeth orthodontically?
