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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. How many types of cells are found in the enamel organ in the bell stage?
Initiation stage
4 types
Imbrication lines of von Ebner
The basement membrane

2. What are the mature cells for cementum?
Abnormally large teeth
Ameloblasts
The cervical loop
Cementocytes

3. What are the formative cells for alveolar bone?
The ectomesenchyme
Compressed layer of flat to 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
Osteoblasts

4. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Odontoblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
9th to 10th weeks
The ameloblasts place an acellular dental cuticle on the new enamel surface

5. What are the cell layers found in the enamel organ in the bell stage?
Differentiation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The enamel organ is compressed
The basement membrane

6. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
During the cap stage
Dentin secreting cells (odontoblats)
Tooth germ
The basement membrane

7. When does dens in dente occur?
During the cap stage
Inner
The bud stage
The enamel organ - dental papilla - dental sac

8. What type of tissue is dentin - cementum - and alveolar bone?
During the cap stage
Connective
Hereditary in localized form. endocrine dysfunction is complete
Odontoblasts

9. What are the etiological factors for micro/macrodontia?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Epithelial rests of Malassez
Compressed layer of flat to cuboidal cells
Hereditary in localized form. endocrine dysfunction is complete

10. What is anodontia?
Enamel organ invaginates into the dental papilla
Faulty development of enamel from interference involving ameloblasts
Absence of single or multiple teeth
Initiation

11. When does macro/microdontia occur?
The cervical loop
Union of 2 adjacent tooth germs
Bud stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

12. What stage does supernumerary teeth occur?
Initiation
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 outer enamel epithelium
Dentin secreting cells (odontoblats)

13. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The enamel organ
The basement membrane
Initiation stage
Induction - proliferation

14. What is cementogenisis?
Imbrication lines of von Ebner
The ameloblasts place an acellular dental cuticle on the new enamel surface
The enamel organ is compressed
Apposition of the cementum

15. What stage does the dental tissues subsequently fully mineralize
11th to 12th weeks
Maturation
When the gingiva recedes and no actual tooth movement takes place
In the cap stage

16. What hard tissue has vascularity?
Enamel organ
Enamel secreting cells (ameloblasts)
Alveolar bone
In the cap stage

17. What type of tissue is enamel?
Epithelial
The enamel organ - dental papilla - dental sac
Induction
Hereditary

18. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Development of one or more extra teeth
Odontoclasts
The tooth germ

19. What processes are involved with the apposition stage?
Differentiation - proliferation - morphogenesis
Induction - proliferation
Dental tissues fully mineralize to their mature levels.
Odontoblastic process

20. What are entrapped cementoblasts called?
Cementoblasts
Faulty development of enamel from interference involving ameloblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementocytes

21. What do the odontoblasts do?
Differentiation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Initiation stage
Induction

22. What is another name for the dental sac?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Apposition of the cementum
Morphogenesis
Dental follicle

23. What are the clinical ramifications of concrescence?
Apposition of the cementum
Common with permanent maxillary molars
Maturation
As a result of the apposition of cementum over dentin

24. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Dens in dente - gemination - tubercle - and fusion
The outer cells of the dental papilla and the central cells of the dental papilla
Odontoblastic process

25. What kind of cells occur in the outer enamel epithelium in the bell stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cuboidal cells
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Traumatic injury or crowding of teeth

26. What are the incremental lines for cementum and alveolar bone?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Arrest and reversal lines
11th to 12th weeks
The dental sac

27. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Union of root structure of two or more teeth by cementum
Tooth germ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The basement membrane

28. Active eruption
The actual vertical movement of the tooth
Displacement of ameloblasts to root surface
There are none - they are lost with eruption
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

29. What does the cervical loop consist of?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Pressure on the area
Epithelial rests of Malassez
A bilayer rim that consists only IEE and OEE

30. Where is the dental sac originally derived from?
The enamel organ
A mineralized cylinder - the dentinal tubule
The ectomesenchyme
In the cap stage

31. The stratum intermediate is located inner or outer?
Inner
Maturation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The cementum - PDL - and alveolar bone

32. What is the predominate process of the cap stage?
Morphogenesis
Epithelial rests of Malassez
Abnormally large teeth
Dental papilla

33. Which teeth are nonsuccedaneous?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
There is unequal growth in different parts of the tooth bud
The ameloblasts
The permanent molars

34. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The enamel - dentin - and cementum are secreted in successive layers
8th week
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Hereditary

35. What is the time span for the bud stage?
Dentin secreting cells (odontoblats)
Odontogenesis
As a result of the apposition of cementum over dentin
8th week

36. What kind of cells reside in the stratum intermediate?
The primordium of the pulp
Absence of single or multiple teeth
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
Compressed layer of flat to cuboidal cells

37. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The basement membrane that seperates the enamel organ and dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla
The enamel organ is compressed

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

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39. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla
Maturation
The apposition of the enamel matrix

40. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Hereditary in localized form. endocrine dysfunction is complete
Odontoblastic process
Enamel secreting cells (ameloblasts)
Differentiation

41. What are the mature cells for dentin?
Only dentinal tubules with processes
The stellate reticulum
Extra cusp due to effects on enamel organ
The cementum - PDL - and alveolar bone

42. What hard tissue is can not have tissue formation after eruption?
Union of root structure of two or more teeth by cementum
Union of 2 adjacent tooth germs
Proliferation - differentiation - morphogenesis
Enamel

43. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Sphere of enamel on root
The outer cells of the dental papilla and the central cells of the dental papilla
Tooth germ
Compressed layer of flat to cuboidal cells

44. The preameloblasts induce dental papilla cells to differentiate into what?
When the gingiva recedes and no actual tooth movement takes place
Into odontoblasts
Only dentinal tubules with processes
Compressed layer of flat to cuboidal cells

45. What are the mature cells for alveolar bone?
The basement membrane
Osteocytes
Morphogenesis
Cementoblasts

46. What are the development disturbances of the apposition and maturation stages?
The basement membrane
The enamel - dentin - and cementum are secreted in successive layers
Enamel pearl - enamel dysplasia - and concresence
Osteocytes

47. The stellate reticulum is located inner or outer?
Osteocytes
Dental papilla
Outer
The dental lamina

48. What is the time span for the cap stage?
9th to 10th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary in localized form. endocrine dysfunction is complete
Commonly involves permanent maxillary lateral incisor and 3rd molars

49. What is the cementum matrix called?
Extra cusp due to effects on enamel organ
Cementoid
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.
Apposition of the cementum

50. What is the process involved in the maturation stage?
Maturation
Imbrication lines of von Ebner
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.
Cuboidal cells