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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. What processes are involved with the apposition stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Traumatic injury or crowding of teeth
Induction - proliferation
Future dentin and pulp tissue

2. What are the etiological factors for supernumerary teeth?
Hereditary
The actual vertical movement of the tooth
Proliferation - differentiation - morphogenesis
Connective

3. What kind of cells occur in the outer enamel epithelium in the bell stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The actual vertical movement of the tooth
Cuboidal cells
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

4. What stage does the dental tissues subsequently fully mineralize
Cementocytes
The ectomesenchyme
The basement membrane
Maturation

5. What causes the induction of the preameloblasts to differentiate into ameloblasts?
6th to 7th weeks
The enamel organ - dental papilla - dental sac
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
It disintegrates as the developing oral mucosa comes to line the oral cavity

6. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Maturation
Dentin and alveolar bone
8th week
The dental sac

7. Where is the enamel matrix secreted from by the ameloblasts?

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8. What is the cementum matrix called?
Morphogenesis
Cementoid
Extra cusp due to effects on enamel organ
Initiation

9. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Preameloblasts
Common on permanent molars or cingulum of anterior teeth
Cementoblasts
8th week

10. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Initiation
The cervical loop
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

11. Where is the dental papilla originally derived from?
Enamel organ invaginates into the dental papilla
The ectomesenchyme - which was influenced by the neural crest cells
The ectoderm
Common on permanent molars or cingulum of anterior teeth

12. What do the odontoblasts do?
Dental follicle
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Maturation
Osteoblasts

13. What happens during the bud stage?
Trauma - pressure or metabolic disease
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
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dental tissues fully mineralize to their mature levels.

14. Where does the primordium of the permanent dentition develop?
The enamel organ - dental papilla - dental sac
Imbrication lines of von Ebner
Union of root structure of two or more teeth by cementum
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

15. What are entrapped cementoblasts called?
Hereditary
The outer enamel epithelium
Cementocytes
A bilayer rim that consists only IEE and OEE

16. What is the process involved in the maturation stage?
Maturation
Imbrication lines of von Ebner
The ectomesenchyme - which was influenced by the neural crest cells
There is unequal growth in different parts of the tooth bud

17. What are the cell layers found in the enamel organ in the bell stage?
Cuboidal cells
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The permanent molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

18. What happens to the thickened non tooth producing portions of the dental lamina eventually?
A mineralized cylinder - the dentinal tubule
Absence of single or multiple teeth
Displacement of ameloblasts to root surface
It disintegrates as the developing oral mucosa comes to line the oral cavity

19. The stellate reticulum is located inner or outer?
Odontogenesis
May be confused as calculus deposit on root
Dental papilla
Outer

20. What is the time span for the bell stage?
Induction
11th to 12th weeks
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

21. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
The enamel organ
The outer cells of the dental papilla and the central cells of the dental papilla
The permanent molars

22. What are the incremental lines for enamel?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The cervical loop
Lines of Retzuis
Osteocytes

23. What stage does anodontia occur?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Initiation stage
Union of root structure of two or more teeth by cementum
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

24. What wll the inner enamel epithelium differentiate into?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel secreting cells (ameloblasts)
The primordium of the pulp

25. The preameloblasts induce dental papilla cells to differentiate into what?
The enamel - dentin - and cementum are secreted in successive layers
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Into odontoblasts
Enamel

26. Tooth development
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontogenesis
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
Differentiation

27. What are the formative cells for dentin?
Future dentin and pulp tissue
Dentin and alveolar bone
Odontoblasts
Dens in dente - gemination - tubercle - and fusion

28. How many types of cells are found in the enamel organ in the bell stage?
Initiation stage
Future dentin and pulp tissue
The cervical loop
4 types

29. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Inner
During the cap stage
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ameloblasts

30. When does the tooth bud become a tooth germ?
Induction - proliferation
The ameloblasts
Cuboidal cells
In the cap stage

31. What else undergoes proliferation in the bud stage besides the dental lamina?
Traumatic injury or crowding of teeth
The tooth germ
The ectomesenchyme
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

32. What is fusion?
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementoid
Union of 2 adjacent tooth germs

33. The stratum intermediate is located inner or outer?
Tooth germ tries to divide
Inner
A bilayer rim that consists only IEE and OEE
Proliferation

34. What happens when the reduced enamel epithelium is created?
The basement membrane
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
Only dentinal tubules with processes
As a result of the apposition of cementum over dentin

35. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
6th to 7th weeks
The outer cells of the dental papilla and the central cells of the dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

36. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Dentin secreting cells (odontoblats)
Oral epithelium
Cementocytes

37. The oral epithelium is induced by the ectomesenchyme to produce what?
The ectomesenchyme - which was influenced by the neural crest cells
The dental lamina
Imbrication lines of von Ebner
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

38. What is matrix?
Local or systemic or hereditary
The outer cells of the dental papilla and the central cells of the dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

39. What are the formative cells for cementum?
Dens in dente - gemination - tubercle - and fusion
Inner
6th to 7th weeks
Cementoblasts

40. What are the clinical ramifications of micro/macrodontia?
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
Tooth germ tries to divide
Commonly involves permanent maxillary lateral incisor and 3rd molars
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

41. Where is the enamal organ originally derived from?
Morphogenesis
Tooth germ tries to divide
Differentiation - proliferation - morphogenesis
The ectoderm

42. What hard tissue has vascularity?
Only dentinal tubules with processes
Dental tissues fully mineralize to their mature levels.
Alveolar bone
The cementum - PDL - and alveolar bone

43. What are the mature cells for cementum?
Cementocytes
As a result of the apposition of cementum over dentin
The basement membrane
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

44. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Inner
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
There are none - they are lost with eruption

45. What is microdontia?
Absence of single or multiple teeth
Abnormally small teeth
Differentiation
Cementoid

46. What are the mature cells for alveolar bone?
Osteocytes
The apposition of the enamel matrix
Into odontoblasts
The cementum - PDL - and alveolar bone

47. What are the clinical ramifications of enamel pearl?
Absence of single or multiple teeth
The outer enamel epithelium
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
May be confused as calculus deposit on root

48. What are the etiological factors of concrescence?
The bud stage
Oral epithelium
Cementocytes
Traumatic injury or crowding of teeth

49. What happens during initiation?
The primordium of the pulp
Abnormally small teeth
Preameloblasts
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

50. What are the clinical ramifications of anodontia?
Compressed layer of flat to cuboidal cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

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Dentistry Tooth Development And Eruption

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