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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. Tooth development
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontogenesis
Commonly involves permanent maxillary lateral incisor and 3rd molars
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

2. What layer serves as protection for the enamel organ?
The outer enamel epithelium
The ameloblasts
Faulty development of enamel from interference involving ameloblasts
The dental lamina

3. What happens during initiation?
Dental follicle
Cementoblasts
Ectoderm lining stomodeum gives rise to the oral epithelium and then to the dental lamina - adjacent to deeper ectomesenchyme - Which is influenced by the neural crest cells. Both tissues are seperated by a basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

4. What are the formative cells for enamel?
Induction
Cementocytes
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Ameloblasts

5. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Morphogenesis
Trauma - pressure or metabolic disease
Absence of single or multiple teeth

6. What are the formative cells for cementum?
Odontoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ameloblasts
Cementoblasts

7. What happens during the bell stage?
Union of root structure of two or more teeth by cementum
Enamel secreting cells (ameloblasts)
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontogenesis

8. What hard tissue has vascularity?
Initiation
Absence of single or multiple teeth
Alveolar bone
When the gingiva recedes and no actual tooth movement takes place

9. What happens when the reduced enamel epithelium is created?
Epithelial rests of Malassez
The primary tooth can now erupt into the oral cavity - the REE fuses with the oral epithelium - then enzymes from the REE disintegrate the central portion of the epithelial tissue leaving an epithelial tunnel for the tooth to erupt
Odontoclasts
Proliferation - differentiation - morphogenesis

10. What is the site for the future dentioenamel junction?
The primary tooth can now erupt into the oral cavity - the REE fuses with the oral epithelium - then enzymes from the REE disintegrate the central portion of the epithelial tissue leaving an epithelial tunnel for the tooth to erupt
The basement membrane that seperates the enamel organ and dental papilla
Enamel pearl - enamel dysplasia - and concresence
Odontoclasts

11. What happens during the bud stage?
Into odontoblasts
Cementoblasts
Faulty development of enamel from interference involving ameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

12. What stage does supernumerary teeth occur?
Tooth germ
Enamel pearl - enamel dysplasia - and concresence
Initiation
The apposition of the enamel matrix

13. What is the predominate process of the cap stage?
Odontoblastic process
Maturation
Morphogenesis
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

14. The stratum intermediate is located inner or outer?
Inner
Connective
Oral epithelium
Faulty development of enamel from interference involving ameloblasts

15. What hard tissue is can not have tissue formation after eruption?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Induction
Enamel
Faulty development of enamel from interference involving ameloblasts

16. What are the clinical ramifications of fusion?
Connective
The primary tooth can now erupt into the oral cavity - the REE fuses with the oral epithelium - then enzymes from the REE disintegrate the central portion of the epithelial tissue leaving an epithelial tunnel for the tooth to erupt
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementocytes

17. What are entrapped cementoblasts called?
Future dentin and pulp tissue
Large single rooted tooth with one pulp cavity and exhibits 'twinning' in crown area. normal number of teeth in dentition. may cause problems in appearance and spacing
Cementocytes
Common with permanent maxillary molars

18. When does dens in dente occur?
Initiation
Absence of single or multiple teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
During the cap stage

19. How is the reduced enamel epithelium created?
The enamel organ is compressed
Apposition of the cementum
The enamel organ
When the gingiva recedes and no actual tooth movement takes place

20. The oral epithelium is induced by the ectomesenchyme to produce what?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The dental lamina
11th to 12th weeks
Common with permanent maxillary molars

21. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
During the cap stage

22. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Cementocytes
The dental sac
6th to 7th weeks
There are none - they are lost with eruption

23. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
9th to 10th weeks
The enamel - dentin - and cementum are secreted in successive layers
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontoclasts

24. What is microdontia?
Abnormally small teeth
Apposition of the cementum
6th to 7th weeks
Cementoblasts

25. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Enamel organ invaginates into the dental papilla
Dental tissues secreted as matrix in successive layers.
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

26. What are the clinical ramifications of anodontia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The bud stage

27. In the cap stage the tooth bud does not grow - what happens?
Cuboidal cells
8th week
The basement membrane that seperates the enamel organ and dental papilla
There is unequal growth in different parts of the tooth bud

28. What are the formative cells for dentin?
The primordium of the pulp
Union of 2 adjacent tooth germs
A mineralized cylinder - the dentinal tubule
Odontoblasts

29. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
May be confused as calculus deposit on root
The basement membrane
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Tooth germ

30. What is dens in dente?
9th to 10th weeks
Enamel organ invaginates into the dental papilla
Enamel organ forms into cap - surrounding mass of dental papilla from the ectomesenchyme and surrounded by mass of dental sac also from the ectomesenchyme. Formation of the tooth germ.
The dental lamina

31. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Differentiation
4 types
Tooth germ
Dentin and alveolar bone

32. Active eruption
Proliferation
8th week
The outer cells of the dental papilla and the central cells of the dental papilla
The actual vertical movement of the tooth

33. What will the dental papilla eventually form?
Future dentin and pulp tissue
In the cap stage
The enamel organ is compressed
The ectomesenchyme - which was influenced by the neural crest cells

34. What are the etiological factors for enamel pearl?
Abnormally small teeth
Displacement of ameloblasts to root surface
Extra cusp due to effects on enamel organ
The tooth germ

35. What happens during the maturation stage?
The enamel organ
The stellate reticulum
The ectomesenchyme
Dental tissues fully mineralize to their mature levels.

36. What are the mature cells for enamel?
Cementocytes
The primordium of the pulp
Abnormally small teeth
There are none - they are lost with eruption

37. What stage does the dental tissues subsequently fully mineralize
Maturation
The outer cells of the dental papilla and the central cells of the dental papilla
Proliferation - differentiation - morphogenesis
There are none - they are lost with eruption

38. What are the etiological factors for anodontia?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Tall columnar cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Lines of Retzuis

39. What will the inner cells of the dental lamina differentiates into?
The outer enamel epithelium
Commonly involves permanent maxillary lateral incisor and 3rd molars
The primordium of the pulp
Cementoblasts

40. What happens during the appositional stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Pressure on the area
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel - dentin - and cementum are secreted in successive layers

41. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Inner
The cervical loop
Dental papilla
The basement membrane

42. What are the mature cells for dentin?
Only dentinal tubules with processes
The basement membrane
Ectoderm lining stomodeum gives rise to the oral epithelium and then to the dental lamina - adjacent to deeper ectomesenchyme - Which is influenced by the neural crest cells. Both tissues are seperated by a basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

43. What are the clinical ramifications?
Compressed layer of flat to cuboidal cells
The bud stage
Common on permanent molars or cingulum of anterior teeth
Odontoblasts

44. What is the main process involved in initiation?
Induction
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ameloblasts
Enamel organ

45. What is the outer portion of the ectoderm in the initiation stage?
The basement membrane
The ectomesenchyme
Oral epithelium
A bilayer rim that consists only IEE and OEE

46. How many types of cells are found in the enamel organ in the bell stage?
The primordium of the pulp
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The apposition of the enamel matrix
4 types

47. What are the incremental lines for cementum and alveolar bone?
The dental sac
Arrest and reversal lines
Enamel organ
Proliferation - differentiation - morphogenesis

48. What wll the inner enamel epithelium differentiate into?
Development of one or more extra teeth
Dental papilla
Enamel organ
Enamel secreting cells (ameloblasts)

49. Where is the dental sac originally derived from?
The ectomesenchyme
Local or systemic or hereditary
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Osteocytes

50. Where is the dental papilla originally derived from?
The apposition of the enamel matrix
The ectomesenchyme - which was influenced by the neural crest cells
During the cap stage
The outer enamel epithelium