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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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Match each statement with the correct term.
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1. How is the dentinocemental junction formed?
A mineralized cylinder - the dentinal tubule
There is unequal growth in different parts of the tooth bud
During the cap stage
As a result of the apposition of cementum over dentin

2. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Alveolar bone
The primordium of the pulp
The enamel - dentin - and cementum are secreted in successive layers
Preameloblasts

3. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Displacement of ameloblasts to root surface
The basement membrane
During the cap stage
The cementum - PDL - and alveolar bone

4. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
The dental lamina
Faulty development of enamel from interference involving ameloblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity

5. What stage does the dental tissues subsequently fully mineralize
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Maturation
The ectomesenchyme

6. What is the main process involved in the bud stage?
Enamel organ
The tooth germ
The dental lamina
Proliferation

7. What is tubercle?
In the cap stage
Dental follicle
9th to 10th weeks
Extra cusp due to effects on enamel organ

8. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Maturation
Traumatic injury or crowding of teeth
There is unequal growth in different parts of the tooth bud

9. What do the odontoblasts do?
The dental lamina
Odontoblastic process
Outer
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

10. What are the mature cells for alveolar bone?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Osteocytes
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel secreting cells (ameloblasts)

11. What are the incremental lines for enamel?
Bud stage
When the gingiva recedes and no actual tooth movement takes place
Lines of Retzuis
9th to 10th weeks

12. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Bud stage
Maturation

13. The stratum intermediate is located inner or outer?
Cuboidal cells
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Inner

14. What is the time span for the bell stage?
Union of 2 adjacent tooth germs
Enamel secreting cells (ameloblasts)
Cementocytes
11th to 12th weeks

15. What are the clinical ramifications of fusion?
Maturation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Lines of Retzuis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

16. What type of tissue is enamel?
Preameloblasts
The actual vertical movement of the tooth
Epithelial
Union of 2 adjacent tooth germs

17. Where does the primordium of the permanent dentition develop?
The apposition of the enamel matrix
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
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.

18. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
11th to 12th weeks
Extra cusp due to effects on enamel organ
May be confused as calculus deposit on root
The outer cells of the dental papilla and the central cells of the dental papilla

19. What are the mature cells for dentin?
The cervical loop
Only dentinal tubules with processes
Oral epithelium
Arrest and reversal lines

20. What are the formative cells for dentin?
Hereditary in localized form. endocrine dysfunction is complete
Odontoblasts
Cementoblasts
There are none - they are lost with eruption

21. What are the formative cells for cementum?
Tooth germ tries to divide
Cementoblasts
Development of one or more extra teeth
The basement membrane

22. When does the tooth bud become a tooth germ?
11th to 12th weeks
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental follicle
In the cap stage

23. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
6th to 7th weeks
Proliferation

24. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Sphere of enamel on root
The dental sac
The enamel - dentin - and cementum are secreted in successive layers

25. What are the incremental lines for cementum and alveolar bone?
Initiation
Arrest and reversal lines
The ectomesenchyme
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

26. Do odontoblasts start their secretion of matrix before the ameloblasts?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Future dentin and pulp tissue
As a result of the apposition of cementum over dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

27. When does the process of root development take place?
Only dentinal tubules with processes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Initiation

28. What are the clinical ramifications of supernumerary teeth?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The enamel organ is compressed
Osteocytes
Extra cusp due to effects on enamel organ

29. What are the formative cells for enamel?
Oral epithelium
The cervical loop
Ameloblasts
Cementocytes

30. What is macrodontia?
Induction
Dental tissues secreted as matrix in successive layers.
Abnormally large teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

31. What will the dental sac give rise to?
The bud stage
The cementum - PDL - and alveolar bone
Union of 2 adjacent tooth germs
9th to 10th weeks

32. What is fusion?
Proliferation - differentiation - morphogenesis
Cementoblasts
Union of 2 adjacent tooth germs
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

33. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Alveolar bone
Differentiation
Odontoclasts
Abnormally small teeth

34. Active eruption
The permanent molars
The actual vertical movement of the tooth
Hereditary
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.

35. What are the etiological factors for dens in dente and gemination?
The ectomesenchyme
The primordium of the pulp
Hereditary
Tall columnar cells

36. What stage does supernumerary teeth occur?
Initiation
Imbrication lines of von Ebner
The apposition of the enamel matrix
Dental follicle

37. What layer serves as protection for the enamel organ?
Alveolar bone
Pressure on the area
Proliferation - differentiation - morphogenesis
The outer enamel epithelium

38. What are the clinical ramifications of anodontia?
Cementocytes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel - dentin - and cementum are secreted in successive layers
Enamel organ invaginates into the dental papilla

39. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
It disintegrates as the developing oral mucosa comes to line the oral cavity
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

40. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Future dentin and pulp tissue
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementoblasts
As a result of the apposition of cementum over dentin

41. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Cementoblasts
Morphogenesis
Sphere of enamel on root

42. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dental papilla
Common with permanent maxillary molars
Cementocytes

43. What are the formative cells for alveolar bone?
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
Osteoblasts
The primordium of the pulp
A bilayer rim that consists only IEE and OEE

44. What is another name for the dental sac?
Differentiation - proliferation - morphogenesis
Dental follicle
Dens in dente - gemination - tubercle - and fusion
Cementocytes

45. What is the site for the future dentioenamel junction?
Development of one or more extra teeth
Compressed layer of flat to cuboidal cells
The basement membrane that seperates the enamel organ and dental papilla
Dental papilla

46. Which teeth are nonsuccedaneous?
Hereditary
The permanent molars
Lines of Retzuis
The enamel organ is compressed

47. What are the mature cells for enamel?
There are none - they are lost with eruption
Differentiation
The enamel organ
The basement membrane

48. What happens when the reduced enamel epithelium is created?
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
Common on permanent molars or cingulum of anterior teeth
Imbrication lines of von Ebner
The ectomesenchyme

49. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Morphogenesis
The ameloblasts
The actual vertical movement of the tooth
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

50. What will the outer cells of the dental lamina differentiate into?
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.
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dentin secreting cells (odontoblats)
9th to 10th weeks

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Dentistry Tooth Development And Eruption

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