TN MGR Med Univ Previous year Question papers 1990- 2013

Enamel

1.    Describe life cycle of ameloblasts.

2.    Microscopic feature of enamel     

3.    Age changes in enamel

4.    Enamel lamellae

5.    Dentinoenamel junction

6.    Enamel tufts

7.    Gnarled enamel      

8.    Histological structure of enamel  

9.    Ameloblasts 

10. Enamel spindle       

11. Enumerate hypocalcified areas of enamel and decribe enamel lamellae, tufts. Give their clinical significance  

12. Lines of enamel      

13. Enamel rods 

14. Describe micrscopic appearance of enamel       

15. Describe structure of mature enamel      

16. Maturation of enamel       

17. Hunter-Scherger bands     

18. Incremental lines of Retzius        

19. Describe amelogenesis with suitable diagrams  

20. Discuss in detail the life cycle of ameloblast     

21. Enumerate with suitable diagrams the microscopic structure of enamel.

22. Life cycle of ameloblast     

23. Hypocalcified structures of enamel        

24. Morphodifferentiation of enamel organ

TN MGR Med Univ Previous year Question papers 1990- 2013

Development of face

1.    Meckel’s cartilage

2.    Development of Maxilla and Mandible

3.    development of mandible

4.    Development of middle third of face

5.    Derivatives of second pharyngeal arch

Development of teeth

1.    Mention various stages of tooth development. Describe in detail the life cycle of ameloblasts with diagrams

2.    Describe the development of roots of maxillary permanent molar.

3.    Functions of stellate reticulum     

4.    Fate of dental lamina        

5.    development of pulp        

6.    Hertwig's epithelial root sheath   

7.    Describe various stages of tooth development

8.    Cell rests of Malassez       

9.    Histodifferentiation and morphodifferentiation of ameloblasts        

10. Describe the different stages of tooth development.

11. Enumerate the various stages of tooth development. Describe in detail the advanced bell stage.

12. Describe various stages of tooth development and describe in detail the bell stage.

13. Bell stage

14. Late bell stage

15. Epithelial-mesenchymal interaction in tooth development.

16. Write an essay about tooth development. Add a note on histological and morphological differentiation of odontogenesis.

17. Describe the bell stage of tooth development with help of diagrams and add a note on root development

Enamel

Questions	Answers
In which stage of amelogenesis does resoprtion of basal lamina of inner enamel epithelium occur	Presecretory stage. During histodifferentiation.
In which stage of amelogenesis  does initial layer of aprismatic enamel forms	Secretory stage. This event marks the start of secretory stage
In which stage of amelogenesis does, ameloblast dies?	In late secretory stage and the transition stage where morphologically most of ameloblasts shorten while 50% of them die
In which stage of amelogenesis does vascular invagination of enamel organ occur	In transition stage
In which stage of amelogenesis does the basal lamina of ameloblast reformed	In transition stage
In which stage of amelogenesis does matrix secretion ceases	In transition stage
In which stage of amelogenesis  does selective matrix withdrawal or resorption occur	In transition stage
In which stage of amelogenesis does cycling of ruffled and smooth bordered ameloblast occur	in maturation stage
In which stage of amelogenesis does the full width of immature enamel matrix is laid down	In transition stage
In which stage of amelogenesis does the rough bordered ameloblast turn smooth	in maturation stage
How long does the maturation stage of enamel lasts	three to four years
The dimension of differentiated ameloblast is	60 micrometer in height and 2-4 micrometers in width
Odontoblast differentiation is mediated by inner enamel epithelium through	transforming growth factor - beta
The pre-ameloblasts releases enzyme by	exocytosis
The non-collagenous protein of odontoblast that mediates epithelium-mesenchymal interaction is	Dentin sialophosphoprotein
In aprismatic enamel near DEJ, the enamel crystallites are arranged	in random orientation
In aprismatic enamel at peripery [outer surface of crown] , the enamel crystallites are arranged	uniformly parallel to each other
The shape of the Tomes process is responsible for	prismatic architechture of enamel
Each enamel prism is formed by	single ameloblast but four contribute to the interprismatic substance
The mineralizing front of enamel is observed under electron microscopy as	honeycomb pattern
Ameloblasts are joined to each other by	terminal bar apparatus distally at the base of the Tome's process
The juntion of terminal web apparatus of ameloblsts is	Zonular in nature
Cell junction at basal end of ameloblasts [near to st.intermedium]	Macular in nature
The prism boundaries of enamel	are formed first giving the deveeloping enamel front a pit-like surface appearance
Initiation of mineralization of enamel is mediated by	Dentin sialophosphoprotein
Ameloblastin determines	the prismatic pattern
Enamel crystallite growth  and nucleation of enamel are controlled by	Tuftlin
Within the enamel prism, the amelogenin are located in the	center of the prism. Non-amelogenins in periphery of the prisms.
Number of rows of ameloblasts that are generated each week at cervical loop is	seven
The transcription factor responsible for regulating cell destiny is	Egr-1
The gene product that is localized to enamel knot is	Msx-2
The regulator of enamel morphogenesis is	Msx-2
The commonest site of enamel pearl formation is	near furcation region in root, nearer to the cervical region

Enamel

Questions

1. In which stage of amelogenesis does resoprtion of basal lamina of inner enamel epithelium occur
2. In which stage of amelogenesis  does initial layer of aprismatic enamel forms
3. In which stage of amelogenesis does, ameloblast dies?
4. In which stage of amelogenesis does vascular invagination of enamel organ occur
5. In which stage of amelogenesis does the basal lamina of ameloblast reformed
6. In which stage of amelogenesis does matrix secretion ceases
7. In which stage of amelogenesis  does selective matrix withdrawal or resorption occur
8. In which stage of amelogenesis does cycling of ruffled and smooth bordered ameloblast occur
9. In which stage of amelogenesis does the full width of immature enamel matrix is laid down
10. In which stage of amelogenesis does the rough bordered ameloblast turn smooth
11. How long does the maturation stage of enamel lasts
12. The dimension of differentiated ameloblast is
13. Odontoblast differentiation is mediated by inner enamel epithelium through
14. The pre-ameloblasts releases enzyme by
15. The non-collagenous protein of odontoblast that mediates epithelium-mesenchymal interaction is
16. In aprismatic enamel near DEJ, the enamel crystallites are arranged
17. In aprismatic enamel at peripery [outer surface of crown] , the enamel crystallites are arranged
18. The shape of the Tomes process is responsible for
19. Each enamel prism is formed by
20. The mineralizing front of enamel is observed under electron microscopy as
21. Ameloblasts are joined to each other by
22. The juntion of terminal web apparatus of ameloblsts is
23. Cell junction at basal end of ameloblasts [near to st.intermedium]
24. The prism boundaries of enamel
25. Initiation of mineralization of enamel is mediated by
26. Ameloblastin determines
27. Enamel crystallite growth  and nucleation of enamel are controlled by
28. Within the enamel prism, the amelogenin are located in the
29. Number of rows of ameloblasts that are generated each week at cervical loop is
30. The transcription factor responsible for regulating cell destiny is
31. The gene product that is localized to enamel knot is
32. The regulator of enamel morphogenesis is
33. The commonest site of enamel pearl formation is

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Enamel-4

Questions	Answers
Absence of Tomes process in first and final stage of enamel deposition causes	Deposition of non-prismatic enamel. Hence the outermost and inner most layer of enamel formed is highly mineralized.
Average width of cross striation in enamel rods	3 to 6 micrometers
short period deposition of incremental lines are commonly called as	cross striations
Long period records of incremental lines are commonly called as	Striae
Number of cross striation in an average human teeth	7 to 10 cross striations
Average distance between 2 cross striations is	4 micrometers
Average distance between 2 striae is	25 to 35 micrometers
In deciduous teeth enamel striae and perikymata can be best observed along	cervical enamel
what is enamel cap	Along lateral surface, small elevations of 10 to 15 micrometers of radius of enamel deposition over minute non-mineralizable deposits, often at areas of late development in surface of enamel. These are electron microscopical structures
What is enamel focal holes	Loss of enamel caps and underlying material by attrition or abrasion leads to openings in enamel called as focal holes. These are electron microscopical structures
What is enamel brouchs	large surface elevations like an enamel cap, 30 to 50 micrometers in diameter, often with fine radiation groups of crystals - These are electron microscopical structures.
The thickness of layer of the characteristic scalloping of DEJ is	25 to 100 micrometers
The DEJ is highly scalloped	Beneath the cusps and incisal edges. It is the area of concentration of shear forces.
The DEJ is relatively smoother	in lateral surface of coronal enamel
What is the size of microscallops in DEJ	2 to 5 micrometers
average distance between two enamel tuft is about	100 micrometers
The protein content of enamel is highest along	enamel tufts
Structure of enamel best visualized in longitudinal section is	enamel spindles
Structure of enamel best visualized in transverse section is	enamel tufts and enamel lamellae
In which stage of amelogenesis does enamel knot formation occur	presecretory stage. Includes morphodifferentiation and histodifferentiation stages

Enamel- 4

Questions

1. Absence of Tomes process in first and final stage of enamel deposition causes
2. Average width of cross striation in enamel rods
3. Short period deposition of incremental lines are commonly called as
4. Long period records of incremental lines are commonly called as
5. Number of cross striation in an average human teeth
6. Average distance between 2 cross striations is
7. Average distance between 2 striae are
8. In deciduous teeth enamel striae and perikymata can be best observed along
9. What is enamel cap
10. What is enamel focal holes
11. What is enamel brouchs
12. The thickness of layer of the characteristic scalloping of DEJ is
13. The DEJ is highly scalloped along the 
14. The DEJ is relatively smoother along the 
15. What is the size of microscallops in DEJ
16. Average distance between two enamel tuft is about
17. The protein content of enamel is highest along
18. Structure of enamel best visualized in longitudinal section is
19. Structure of enamel best visualized in transverse section is
20. In which stage of amelogenesis does enamel knot formation occur

Answers will be posted tomorrow