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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 are the clinical ramifications of anodontia?
Odontogenesis
Displacement of ameloblasts to root surface
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ectoderm

2. Passive eruption
The cervical loop
Oral epithelium
Dentin and alveolar bone
When the gingiva recedes and no actual tooth movement takes place

3. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Proliferation - differentiation - morphogenesis
Common on permanent molars or cingulum of anterior teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity

4. What are entrapped cementoblasts called?
Dentin secreting cells (odontoblats)
Hereditary in localized form. endocrine dysfunction is complete
Absence of single or multiple teeth
Cementocytes

5. The stratum intermediate is located inner or outer?
Inner
Epithelial rests of Malassez
The basement membrane
Hereditary

6. What else undergoes proliferation in the bud stage besides the dental lamina?
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
8th week
The ectomesenchyme
Odontoblastic process

7. How is the reduced enamel epithelium created?
The enamel organ is compressed
Odontoblastic process
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel organ invaginates into the dental papilla

8. What are the formative cells for dentin?
Arrest and reversal lines
Odontoclasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontoblasts

9. What are the clinical ramifications of gemination?

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10. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Into odontoblasts
Maturation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

11. Where is the dental papilla originally derived from?
Morphogenesis
Cementoblasts
When the gingiva recedes and no actual tooth movement takes place
The ectomesenchyme - which was influenced by the neural crest cells

12. What stage does the dental tissues subsequently fully mineralize
A mineralized cylinder - the dentinal tubule
Initiation
Maturation
The ameloblasts place an acellular dental cuticle on the new enamel surface

13. What are the etiological factors for fusion?
Pressure on the area
Compressed layer of flat to cuboidal cells
Dental tissues fully mineralize to their mature levels.
Commonly involves permanent maxillary lateral incisor and 3rd molars

14. What are the clinical ramifications of micro/macrodontia?
Tooth germ
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Commonly involves permanent maxillary lateral incisor and 3rd molars
The dental lamina

15. What are the clinical ramifications of fusion?
Cementoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Cementoid

16. What processes are involved with the apposition stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectomesenchyme
Induction - proliferation
The ameloblasts place an acellular dental cuticle on the new enamel surface

17. Which teeth are nonsuccedaneous?
The enamel organ
The permanent molars
Initiation stage
Bud stage

18. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
The basement membrane that seperates the enamel organ and dental papilla
Abnormally large teeth
May be confused as calculus deposit on root

19. The preameloblasts induce dental papilla cells to differentiate into what?
Only dentinal tubules with processes
Epithelial rests of Malassez
Into odontoblasts
Tooth germ

20. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Only dentinal tubules with processes
A mineralized cylinder - the dentinal tubule
Hereditary in localized form. endocrine dysfunction is complete

21. What is the time span for the cap stage?
The outer cells of the dental papilla and the central cells of the dental papilla
9th to 10th weeks
Tall columnar cells
When the gingiva recedes and no actual tooth movement takes place

22. What is the predominate process in the bell stage?
The enamel organ
Differentiation
Morphogenesis
Odontoclasts

23. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ameloblasts
The enamel organ
Into odontoblasts

24. Where is the enamal organ originally derived from?
The ectoderm
The dental sac
Dental follicle
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

25. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
There are none - they are lost with eruption

26. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Enamel pearl - enamel dysplasia - and concresence
Compressed layer of flat to cuboidal cells
Odontoclasts
The cervical loop

27. What are the cell layers found in the enamel organ in the bell stage?
Cementoblasts
Union of root structure of two or more teeth by cementum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The permanent molars

28. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Ameloblasts
Cementoblasts
Enamel pearl - enamel dysplasia - and concresence
Tooth germ tries to divide

29. When does dens in dente occur?
During the cap stage
Local or systemic or hereditary
Dental tissues secreted as matrix in successive layers.
There is unequal growth in different parts of the tooth bud

30. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
It disintegrates as the developing oral mucosa comes to line the oral cavity
Osteoblasts
The ectomesenchyme

31. What is cementogenisis?
Odontogenesis
Apposition of the cementum
Dental tissues fully mineralize to their mature levels.
Enamel organ

32. How is the dentinocemental junction formed?
A bilayer rim that consists only IEE and OEE
The basement membrane that seperates the enamel organ and dental papilla
As a result of the apposition of cementum over dentin
The ectomesenchyme - which was influenced by the neural crest cells

33. What type of tissue is enamel?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Absence of single or multiple teeth
Epithelial
Extra cusp due to effects on enamel organ

34. What will the dental papilla eventually form?
Future dentin and pulp tissue
As a result of the apposition of cementum over dentin
The bud stage
11th to 12th weeks

35. What is the embryological background for dentin - cementum and alveolar bone?
The stellate reticulum
Extra cusp due to effects on enamel organ
Enamel organ
Dental papilla

36. What is the time span for the bell stage?
Proliferation - differentiation - morphogenesis
Tall columnar cells
11th to 12th weeks
The ameloblasts

37. What layer serves as protection for the enamel organ?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Inner
The ectomesenchyme - which was influenced by the neural crest cells
The outer enamel epithelium

38. When does the process of root development take place?
Traumatic injury or crowding of teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The stellate reticulum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

39. What are the clinical ramifications of concrescence?
Initiation
The enamel organ - dental papilla - dental sac
Dentin secreting cells (odontoblats)
Common with permanent maxillary molars

40. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Enamel secreting cells (ameloblasts)
Osteocytes
Connective

41. What happens during the bell stage?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
A mineralized cylinder - the dentinal tubule
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Osteocytes

42. What is the cementum matrix called?
Cementoid
Lines of Retzuis
Sphere of enamel on root
Enamel

43. How many types of cells are found in the enamel organ in the bell stage?
The outer cells of the dental papilla and the central cells of the dental papilla
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
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.
4 types

44. What kind of cells occur in the inner enamel epithelium?
The actual vertical movement of the tooth
Proliferation
Displacement of ameloblasts to root surface
Tall columnar cells

45. What is concrescence?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Induction - proliferation
Union of root structure of two or more teeth by cementum
Cementocytes

46. What is gemination?
The stellate reticulum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Tooth germ tries to divide
Enamel

47. Where is the dental sac originally derived from?
As a result of the apposition of cementum over dentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Cementocytes
The ectomesenchyme

48. What happens during the appositional stage?
The ectomesenchyme
Arrest and reversal lines
The ectoderm
The enamel - dentin - and cementum are secreted in successive layers

49. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Morphogenesis
Hereditary
Enamel

50. What is enamel dysplasia?
Cuboidal cells
Faulty development of enamel from interference involving ameloblasts
Induction - proliferation
The basement membrane

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Dentistry Tooth Development And Eruption

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