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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. What wll the inner enamel epithelium differentiate into?
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
Future dentin and pulp tissue
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Enamel secreting cells (ameloblasts)

2. When does dens in dente occur?
During the cap stage
Into odontoblasts
The enamel - dentin - and cementum are secreted in successive layers
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.

3. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Cementoid
It disintegrates as the developing oral mucosa comes to line the oral cavity
Bud stage
Abnormally small teeth

4. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Osteocytes
Odontoblastic process
Dental papilla

5. What processes are involved in the bell stage?
Maturation
Enamel
Differentiation - proliferation - morphogenesis
It disintegrates as the developing oral mucosa comes to line the oral cavity

6. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
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
9th to 10th weeks
Dentin and alveolar bone

7. What are the clinical ramifications of micro/macrodontia?
Displacement of ameloblasts to root surface
Proliferation - differentiation - morphogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface
Commonly involves permanent maxillary lateral incisor and 3rd molars

8. What is another name for the dental sac?
Extra cusp due to effects on enamel organ
Cementoblasts
Abnormally large teeth
Dental follicle

9. What hard tissue has vascularity?
Osteoblasts
Future dentin and pulp tissue
Alveolar bone
The dental sac

10. What hard tissue is can not have tissue formation after eruption?
Displacement of ameloblasts to root surface
Enamel organ invaginates into the dental papilla
Dental tissues secreted as matrix in successive layers.
Enamel

11. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The dental sac
Cementocytes
The apposition of the enamel matrix
The basement membrane

12. How is the reduced enamel epithelium created?
The enamel organ is compressed
Induction - proliferation
Dental follicle
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

13. When does macro/microdontia occur?
Cementoblasts
Bud stage
Maturation
Local or systemic or hereditary

14. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Differentiation - proliferation - morphogenesis
The stellate reticulum

15. What are the clinical ramifications of concrescence?
Differentiation - proliferation - morphogenesis
Common with permanent maxillary molars
4 types
The enamel organ

16. What will the inner cells of the dental lamina differentiates into?
Hereditary
The primordium of the pulp
Outer
11th to 12th weeks

17. What are the clinical ramifications of gemination?

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18. What hard tissue is innervated by nerves?
Dentin and 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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementoblasts

19. What is cementogenisis?
Compressed layer of flat to cuboidal cells
Apposition of the cementum
Enamel pearl - enamel dysplasia - and concresence
Morphogenesis

20. What stage does the dental tissues subsequently fully mineralize
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
Maturation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectomesenchyme - which was influenced by the neural crest cells

21. What is the structure responsible for root development?
When the gingiva recedes and no actual tooth movement takes place
The cervical loop
Induction
Abnormally large teeth

22. What are the formative cells for dentin?
Enamel
Dentin secreting cells (odontoblats)
The basement membrane
Odontoblasts

23. What are the cell layers found in the enamel organ in the bell stage?
Pressure on the area
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Imbrication lines of von Ebner
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

24. What are the etiological factors for fusion?
Sphere of enamel on root
Pressure on the area
The enamel organ - dental papilla - dental sac
Enamel pearl - enamel dysplasia - and concresence

25. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Differentiation - proliferation - morphogenesis
In the cap stage

26. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Initiation
The enamel organ
The outer enamel epithelium

27. In the cap stage the tooth bud does not grow - what happens?
Cuboidal cells
Development of one or more extra teeth
11th to 12th weeks
There is unequal growth in different parts of the tooth bud

28. What is anodontia?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Absence of single or multiple teeth
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
9th to 10th weeks

29. What is matrix?
4 types
Alveolar bone
The enamel - dentin - and cementum are secreted in successive layers
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

30. What else undergoes proliferation in the bud stage besides the dental lamina?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The actual vertical movement of the tooth
The ectomesenchyme
4 types

31. What will the outer cells of the dental lamina differentiate into?
The ectomesenchyme
A bilayer rim that consists only IEE and OEE
Dentin secreting cells (odontoblats)
The outer enamel epithelium

32. What is fusion?
Union of 2 adjacent tooth germs
The ectomesenchyme
Proliferation
Cementocytes

33. What are the mature cells for alveolar bone?
Osteocytes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ectomesenchyme - which was influenced by the neural crest cells
Morphogenesis

34. What does the cervical loop consist of?
Only dentinal tubules with processes
Compressed layer of flat to cuboidal cells
A bilayer rim that consists only IEE and OEE
The cervical loop

35. What happens during the maturation stage?
Ameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ectomesenchyme
Dental tissues fully mineralize to their mature levels.

36. What is the predominate process in the bell stage?
Union of 2 adjacent tooth germs
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoid
Differentiation

37. What kind of cells occur in the inner enamel epithelium?
Enamel organ invaginates into the dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Differentiation - proliferation - morphogenesis
Tall columnar cells

38. What are the incremental lines for enamel?
Tall columnar cells
The ectomesenchyme
Odontogenesis
Lines of Retzuis

39. What is the time span for initiation?
6th to 7th weeks
In the cap stage
During the cap stage
Cementocytes

40. What happens during initiation?
Abnormally large teeth
Osteoblasts
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
Dentin secreting cells (odontoblats)

41. What processes are involved with the apposition stage?
Dentin and alveolar bone
Induction - proliferation
Enamel
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

42. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Cuboidal cells
Hereditary
The dental sac
Initiation stage

43. What is the time span for the cap stage?
Cementocytes
The enamel - dentin - and cementum are secreted in successive layers
9th to 10th weeks
Proliferation

44. What kind of cells reside in the stratum intermediate?
Cuboidal cells
Compressed layer of flat to cuboidal cells
The stellate reticulum
Local or systemic or hereditary

45. What stage does supernumerary teeth occur?
Local or systemic or hereditary
The bud stage
There are none - they are lost with eruption
Initiation

46. What is the process involved in the maturation stage?
Faulty development of enamel from interference involving ameloblasts
Cuboidal cells
Osteocytes
Maturation

47. What are the odontoblastic processes is contained in what?
Preameloblasts
Enamel secreting cells (ameloblasts)
A mineralized cylinder - the dentinal tubule
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

48. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Compressed layer of flat to cuboidal cells
Absence of single or multiple teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface

49. The stratum intermediate is located inner or outer?
Morphogenesis
Inner
The bud stage
The basement membrane that seperates the enamel organ and dental papilla

50. What is the primordium of the tooth?
The tooth germ
There is unequal growth in different parts of the tooth bud
Hereditary in localized form. endocrine dysfunction is complete
9th to 10th weeks