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
2
Q
- 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
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
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
5
Q
- 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
6
Q
- 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
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
8
Q
12. Which one of the following is not part of the periodontium? • Gingiva • Dentine • Periodontal ligament • Cementum • Alveolar bone
A
• Dentine
9
Q
- 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
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
11
Q
16. Which of the following is not a derivative of mesoderm? • Skeleton • Blood • Kidney • Nervous system • Skeletal muscle
A
• Nervous system
12
Q
17. Incremental lines of Retzius are seen in: • Enamel • Dentine • Cementum • Pulp • Periodontal ligament
A
• Enamel
13
Q
- The 5th cusp on the lower permanent first molar is located where?
- Mesio-buccally
- Disto-buccally
- Mesio-palatally
- Disto-palatally
- Occlusally
A
- Disto-buccally
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
15
Q
- 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
16
Q
23. Which type of cartilage lines the articular surfaces of the TMJ? • Hyaline • Fibrocartilage • Elastic • Fibroelastic • Keratohyalin
A
• Fibrocartilage
17
Q
- 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
- Dentinal tubules are calcified in:
- translucent dentine
- Primary dentine
- secondary dentine
- interglobular dentine
A
- translucent dentine
21
Q
- 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
