ANAT 3030 NOVEMBER 2012 EXAMINATION

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2 Hours 9/11/2012 EXAMS OFFICE USE ONLY

University of the Witwatersrand, Johannesburg

Course or topic No(s) ANAT 3030

Course or topic name(s)

Paper Number & title

BDS III : ORAL BIOLOGY FOR DENTAL

STUDENTS

Examination to be

Held during month of

NOVEMBER 2012

Year of Study

(Arts & Science leave blank)

THIRD

Degree/Diplomas for which

This course is prescribed

BACHELOR OF DENTAL SURGERY

Faculty/ies presenting

Candidates

FACULTY OF HEALTH SCIENCES

SCHOOL OF ORAL HEALTH SCIENCES

Internal examiner(s)

And telephone extension

Number(s)

DR N MASUMBUKO (011 – 717 – 2208)

(COURSE COORDINATOR)

External examiner(s) DR S MEER

Special materials required

(graph/music/drawing paper)

maps, diagrams, tables,

computer cards, etc.

Time allowance Course Nos. ANAT 3030 Hours TWO

Instructions to candidates

(Examiners may wish to use

this space to indicate, inter alia,

the contribution made by this

examination or test towards the

year mark, if appropriate)

ANSWER ALL QUESTIONS. ONLY SCRIPTS

WRITTEN IN BLUE OR BLACK INK WILL BE

MARKED.

Internal Examiners or Heads of Department are requested to sign the declaration overleaf.

ANAT 3030 NOVEMBER 2012 EXAMINATION

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FACULTY OF HEALTH SCIENCES

SCHOOLS OF ANATOMICAL SCIENCES AND PHYSIOLOGY

ORAL BIOLOGY FOR DENTAL STUDENTS (ANAT 3030)

EXAM: 9 NOVEMBER 2012

TIME = 2 HOURS MARKS = 100

ANSWER ALL QUESTIONS IN THE SPACES PROVIDED

STUDENT NUMBER_________________________________________

FOR MARKERS ONLY

QUESTION ONE / 10

QUESTION TWO / 6

QUESTION THREE / 6

QUESTION FOUR / 7

QUESTION FIVE / 8.5

QUESTION SIX / 10

QUESTION SEVEN / 5.5

QUESTION EIGHT / 10

QUESTION NINE / 37

TOTAL: /100

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SECTION A: ANATOMY

QUESTION ONE

1. Name and give the specific causes of FIVE hereditary disturbances of

mineralization in teeth (10)

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QUESTION TWO

2. Describe in detail, accompanied by diagrams, the epithelio-

mesenchymal interactions, which initiate enamel formation. (6)

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QUESTION THREE

3.1 Define ante-mortem tooth loss and post-mortem tooth loss and briefly

describe the features you would look for when describing ante-mortem

and post-mortem tooth loss in DRY BONE. (3)

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3.2 Describe the anterior-posterior relationship of the maxillary and

mandibular incisors in Angle Class I, II and III occlusions (1.5)

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3.3 With what structures does the tip of the mesiobuccal cusp of the

maxillary first molar align in Angle Class I, II and III occlusions (1.5)

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QUESTION FOUR

4.1 Write note on the vascular supply during dentinogenesis (4)

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4.2 How is intratubular (peritubular) dentin formed? (1)

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4.3 Write notes on tertiary dentin (2)

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QUESTION FIVE

5.1 Differentiate between Intra-parenchymal and extra-parenchymal

innervation and give an example of each. (4)

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5.2 Briefly describe the development of the tongue (4.5)

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QUESTION SIX

6.1 Identify the oral mucosa shown on the photograph. BE SPECIFIC (1)

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6.2 Give three (3) reasons for your answer. (3)

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6.3 Explain in detail the process of maturation of the tissue previously

identified. (6)

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QUESTION SEVEN

In these electron micrographs:

7.1 Identify the structure labelled A. (0.5)

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7.2 Identify the structure labelled B. (0.5)

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7.3 What is the mineral component of structures A and B? (0.5)

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7.4. Name the structure that separates A and B. What is the main

composition of this structure? (2)

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7.5 Name the cells which secrete the structures A and B represented in the

electron micrographs. BE SPECIFIC. (2)

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QUESTION EIGHT

8.1 Describe the structure and functions of the periodontium. (3)

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8.2 Describe the embryonic development of the periodontium. (BE

SPECIFIC). (3)

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8.3 Using a fully labelled diagram, illustrate the different fibres of the

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Periodontal ligament in a multirooted tooth. (4)

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SECTION B: PHYSIOLOGY

QUESTION NINE

9.1 Give a description of the level of development a tooth has reached at the point when it starts erupting. (3)

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9.4 Explain the changes in saliva composition after administration of atropine. (5)

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(2) ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….... ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….... 9.6 Describe the functions of salivary IgA in the mouth. (4) ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….... ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….... ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….... ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………....

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9.7 Give a biological explanation for each of the following aspects of mastication:

a) the distance that the mandible Hhb drops when opening is not constant for all chewing cycles. b) when chewing a tough substance, the chewing cycles become shorter as the substance softens. c) the most forceful contraction of the mandibular elevator muscles is achieved when the maxillary and mandibular molars are a few millimeters apart. d) the maximum masticatory force that an individual can generate is higher on intra-osseus implant supported teeth than on full denture based teeth. (8)

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GRAND TOTAL: 100 MARKS