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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 are the major components of the tooth germ?
The ectomesenchyme - which was influenced by the neural crest cells
Cementoid
The enamel organ - dental papilla - dental sac
Oral epithelium

2. What are entrapped cementoblasts called?
Odontogenesis
Cementocytes
Induction - proliferation
There is unequal growth in different parts of the tooth bud

3. What are the clinical ramifications of gemination?

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4. What hard tissue has vascularity?
Alveolar bone
Hereditary
As a result of the apposition of cementum over dentin
Odontoblastic process

5. What is anodontia?
Dentin secreting cells (odontoblats)
The basement membrane that seperates the enamel organ and dental papilla
Development of one or more extra teeth
Absence of single or multiple teeth

6. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
4 types
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Displacement of ameloblasts to root surface
The ameloblasts place an acellular dental cuticle on the new enamel surface

7. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
A bilayer rim that consists only IEE and OEE
Dental papilla
Trauma - pressure or metabolic disease

8. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane
Apposition of the cementum

9. Active eruption
Dentin secreting cells (odontoblats)
Arrest and reversal lines
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
The actual vertical movement of the tooth

10. What is cementogenisis?
May be confused as calculus deposit on root
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
Apposition of the cementum

11. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Trauma - pressure or metabolic disease
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The bud stage
Odontogenesis

12. The preameloblasts induce dental papilla cells to differentiate into what?
Local or systemic or hereditary
Into odontoblasts
Dental tissues fully mineralize to their mature levels.
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

13. What are the processes involved in the cap stage?
The outer cells of the dental papilla and the central cells of the dental papilla
Dentin secreting cells (odontoblats)
Proliferation - differentiation - morphogenesis
The basement membrane that seperates the enamel organ and dental papilla

14. The stratum intermediate is located inner or outer?
Inner
Epithelial
Hereditary
Odontoblasts

15. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Common with permanent maxillary molars
Dental follicle
Odontoclasts
The tooth germ

16. When does dens in dente occur?
Maturation
The primordium of the pulp
During the cap stage
Epithelial

17. What is the time span for the cap stage?
9th to 10th weeks
4 types
Dental papilla
During the cap stage

18. What are the mature cells for enamel?
Enamel organ invaginates into the dental papilla
There are none - they are lost with eruption
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel pearl - enamel dysplasia - and concresence

19. What are the etiological factors for enamel pearl?
Tall columnar cells
Dentin and alveolar bone
Displacement of ameloblasts to root surface
When the gingiva recedes and no actual tooth movement takes place

20. What are the clinical ramifications of dens in dente?
Arrest and reversal lines
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dentin and alveolar bone
11th to 12th weeks

21. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Odontoblasts
Enamel organ invaginates into the dental papilla
Dentin secreting cells (odontoblats)

22. What are the etiological factors of tubercle?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Trauma - pressure or metabolic disease
Preameloblasts
Maturation

23. What are the mature cells for dentin?
4 types
Only dentinal tubules with processes
Pressure on the area
The basement membrane

24. What are the clinical ramifications?
4 types
Dental tissues fully mineralize to their mature levels.
11th to 12th weeks
Common on permanent molars or cingulum of anterior teeth

25. What will the dental papilla eventually form?
Cementoblasts
Dental follicle
Common with permanent maxillary molars
Future dentin and pulp tissue

26. What is the predominate process in the bell stage?
The cervical loop
Proliferation - differentiation - morphogenesis
Preameloblasts
Differentiation

27. What are the clinical ramifications of anodontia?
Tall columnar cells
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
11th to 12th weeks
Tooth germ tries to divide

28. What happens during the cap stage?
Outer
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The basement membrane that seperates the enamel organ and 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.

29. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Hereditary
There is unequal growth in different parts of the tooth bud
Cementoblasts
The basement membrane

30. What is microdontia?
Abnormally small teeth
Cementoid
Dentin secreting cells (odontoblats)
Preameloblasts

31. What are the formative cells for dentin?
Oral epithelium
Differentiation - proliferation - morphogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontoblasts

32. What stage does anodontia occur?
Trauma - pressure or metabolic disease
Lines of Retzuis
Initiation stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

33. When does the tooth bud become a tooth germ?
The enamel organ is compressed
In the cap stage
Epithelial rests of Malassez
11th to 12th weeks

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

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35. What is dens in dente?
Initiation stage
Dental papilla
Enamel organ invaginates into the dental papilla
Osteocytes

36. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Extra cusp due to effects on enamel organ
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Epithelial rests of Malassez
Initiation stage

37. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
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
Proliferation

38. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
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
The outer enamel epithelium
The dental sac

39. What are the formative cells for enamel?
Ameloblasts
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
Inner

40. What is the site for the future dentioenamel junction?
The ameloblasts place an acellular dental cuticle on the new enamel surface
A mineralized cylinder - the dentinal tubule
There are none - they are lost with eruption
The basement membrane that seperates the enamel organ and dental papilla

41. What is the time span for the bud stage?
Oral epithelium
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
8th week
Alveolar bone

42. What is fusion?
Lines of Retzuis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Local or systemic or hereditary
Union of 2 adjacent tooth germs

43. What is the primordium of the tooth?
Tooth germ
Apposition of the cementum
The tooth germ
Enamel secreting cells (ameloblasts)

44. What is the cap in the cap stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The enamel organ
Hereditary
The basement membrane that seperates the enamel organ and dental papilla

45. What are supernumerary teeth?
Inner
Epithelial
The cementum - PDL - and alveolar bone
Development of one or more extra teeth

46. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Cementocytes
Alveolar bone
The ameloblasts
8th week

47. What are the formative cells for cementum?
Enamel secreting cells (ameloblasts)
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cementoblasts
Tooth germ tries to divide

48. How many types of cells are found in the enamel organ in the bell stage?
Cuboidal cells
Union of 2 adjacent tooth germs
Arrest and reversal lines
4 types

49. What is the process involved in the maturation stage?
Maturation
Absence of single or multiple teeth
Hereditary
The basement membrane

50. The oral epithelium is induced by the ectomesenchyme to produce what?
Dental follicle
Dens in dente - gemination - tubercle - and fusion
The dental lamina
Alveolar bone