OCB Qs Flashcards

1
Q
1. Which of the following tissues is formed by the oral epithelium?
• Dentine
• Cementum
• Enamel
• Dental pulp
• Periodontal ligament
A

Enamel

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2
Q
  1. Which of the following statements is false?
    • Neural crest cells undergo ectodermal- to-mesenchymal transitions
    • Neural crest cells are multipotent
    • The initiation stage of tooth development is not part of morphogenesis
    • The thickening of the epithelium in the primary epithelial band is due to an
    increased rate of cell proliferation
    • If the mesenchymal condensation around the epithelial bud does not occur tooth development will stop at the bud stage
A

• The thickening of the epithelium in the primary epithelial band is due to an
increased rate of cell proliferation

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3
Q
3. Which two of the following does the dental follicle not give rise to?
• The dentine
• The periodontal ligament
• The alveolar bone socket
• The cementum
• The dental pulp
A
  • The dentine

* The dental pulp

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4
Q
5. At which stage of tooth development do tooth buds for the permanent teeth
begin to form?
• Bud stage
• Early cap stage
• Late cap stage
• Early bell stage
• Late bell stage
A

• Late bell stage

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5
Q
  1. Which of the following statements is false?
    • The coronal two thirds of the root contain acellular cementum
    • The dental papilla controls alveolar bone metabolism during tooth eruption
    • The cervical loop is where the inner enamel epithelium joins the outer enamel
    epithelium
    • The breakdown of HERS causes cementum and periodontal ligament
    formation
    • HERS maps out the root shape 
A

• The coronal two thirds of the root contain acellular cementum

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6
Q
  1. Which of the follow statements is false?
    • The pulp is often called the dentine-pulp complex because the odontoblast processes extend at least one-third into the dentinal tubules
    • Enamel contains type 1 collagen fibres
    • In older patients the pulp reduces in size
    • Odontoblasts are post mitotic cells and therefore cannot divide
    • The nerves of the dental pulp are both myelinated and unmyelinated
A

• Enamel contains type 1 collagen fibres

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7
Q
11. Which of the following is not a purpose of the dental pulp?
• To form dentine
• To form the periodontal ligament
• Defence against infection
• To repair dentine
• To form the root
A

• To form the periodontal ligament

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8
Q
12. Which one of the following is not part of the periodontium?
• Gingiva
• Dentine
• Periodontal ligament
• Cementum
• Alveolar bone
A

• Dentine

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9
Q
  1. Which of the following statements is true about attached gingivae?
    • It is slightly loose
    • It is bound from the free gingival groove to the tooth
    • It is keratanised
    • It is always stippled
A

• It is keratanised

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10
Q
15. Which tooth has the canine fossa?
• Maxillary first premolar
• Mandibular first premolar
• Maxillary canine
• Mandibular canine
• Mandibular second premolar
A

• Maxillary first premolar

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11
Q
16. Which of the following is not a derivative of mesoderm?
• Skeleton
• Blood
• Kidney
• Nervous system
• Skeletal muscle
A

• Nervous system

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12
Q
17. Incremental lines of Retzius are seen in:
• Enamel
• Dentine
• Cementum
• Pulp
• Periodontal ligament
A

• Enamel

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13
Q
  1. The 5th cusp on the lower permanent first molar is located where?
    - Mesio-buccally
    - Disto-buccally
    - Mesio-palatally
    - Disto-palatally
    - Occlusally
A
  • Disto-buccally
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14
Q
20. By weight how much inorganic material does dentine contain?
• 96 percent
• 70 percent
• 55 percent
• 84 percent
• 43 percent
A

• 96 percent

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15
Q
  1. Which of the following statements is false?
    • Coronal dentine consists only of mantle and circumpulpal dentine
    • Peritubular dentine is hypercalcified compared to intertubular dentine
    • There is often a neonatal line in dentine
    • Interglobular dentine is areas of highly calcified dentine formed by over fusion
    of the calcospherites
    • Tertiary dentine can be reactionary or reparative
A

• Interglobular dentine is areas of highly calcified dentine formed by over fusion

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16
Q
23. Which type of cartilage lines the articular surfaces of the TMJ?
• Hyaline
• Fibrocartilage
• Elastic
• Fibroelastic
• Keratohyalin
A

• Fibrocartilage

17
Q
  1. The proximal part of the mandible is divided into three processes; the
    coronoid process, the condylar process and the angular process. Which of the
    muscles listed below is the coronoid process a site of attachment for?
    • Temporalis muscle
    • Lateral Pterygoid
    • Medial Pterygoid
    • Mylohyoid
    • Digastric
A

• Temporalis muscle

18
Q
26. Which of the following is responsible for the development of the angular
process?
• RunX2
• Pax 9
• TGF – beta 2
• BMP4
• IHH
A

• TGF – beta 2

19
Q
27. Which of these below is the last deciduous tooth to erupt?
• lower second deciduous molar
• upper first deciduous molar
• upper first deciduous central incisor
• lower deciduous canine
• upper first lateral incisor
A

• lower second deciduous molar

20
Q
  1. Dentinal tubules are calcified in:
    - translucent dentine
    - Primary dentine
    - secondary dentine
    - interglobular dentine
A
  • translucent dentine
21
Q
  1. Which of the following statements is false?
    - There is no 5th pharyngeal arch
    - The basic structure of each branchial arch consists of cartilage, a nerve and an artery
    - Within the maxillary process is located the Meckels cartilage
    - the nerve supply to the third pharyngeal arch is the glossopharyngeal nerve
    - The midbrain and rhombomeres 1 and 2 contribute to the face and the first branchial arch
A
  • Within the maxillary process is located the Meckels cartilage