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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 is the inner mass in the cap stage that forms a concavity of the enamel organ?
Oral epithelium
Dental papilla
Compressed layer of flat to cuboidal cells
There are none - they are lost with eruption

2. What processes are involved in the bell stage?
Cuboidal cells
Cementoid
The permanent molars
Differentiation - proliferation - morphogenesis

3. What are the cell layers found in the enamel organ in the bell stage?
Compressed layer of flat to cuboidal cells
9th to 10th weeks
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Osteoblasts

4. What are the mature cells for cementum?
Dens in dente - gemination - tubercle - and fusion
Dental follicle
Odontoclasts
Cementocytes

5. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Tooth germ tries to divide
The apposition of the enamel matrix
The dental sac
Proliferation

6. Where is the dental sac originally derived from?
Morphogenesis
A mineralized cylinder - the dentinal tubule
The ectomesenchyme
Preameloblasts

7. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
The basement membrane that seperates the enamel organ and dental papilla
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Absence of single or multiple teeth

8. What kind of cells reside in the stratum intermediate?
The basement membrane
The actual vertical movement of the tooth
Hereditary
Compressed layer of flat to cuboidal cells

9. Where does the primordium of the permanent dentition develop?
Abnormally small teeth
Hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

10. Active eruption
Epithelial
The actual vertical movement of the tooth
Induction
Oral epithelium

11. What is gemination?
The stellate reticulum
Tooth germ tries to divide
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Only dentinal tubules with processes

12. What is the main process involved in initiation?
Proliferation - differentiation - morphogenesis
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
Induction
Future dentin and pulp tissue

13. What is macrodontia?
The basement membrane that seperates the enamel organ and dental papilla
Sphere of enamel on root
Abnormally large teeth
The enamel organ - dental papilla - dental sac

14. What are supernumerary teeth?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Development of one or more extra teeth
Extra cusp due to effects on enamel organ
Common on permanent molars or cingulum of anterior teeth

15. What will the outer cells of the dental lamina differentiate into?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Hereditary
Dentin secreting cells (odontoblats)
The tooth germ

16. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
4 types
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

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

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18. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Cementocytes
Inner
Preameloblasts
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

19. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Trauma - pressure or metabolic disease
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoblasts

20. What are the formative cells for alveolar bone?
Traumatic injury or crowding of teeth
Odontoblasts
Common on permanent molars or cingulum of anterior teeth
Osteoblasts

21. What is the site for the future dentioenamel junction?
The tooth germ
Initiation
The basement membrane that seperates the enamel organ and dental papilla
The outer cells of the dental papilla and the central cells of the dental papilla

22. What will the dental sac give rise to?
The ectomesenchyme - which was influenced by the neural crest cells
The bud stage
The cementum - PDL - and alveolar bone
Dentin secreting cells (odontoblats)

23. What are the clinical ramifications of micro/macrodontia?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The dental sac
Sphere of enamel on root
Commonly involves permanent maxillary lateral incisor and 3rd molars

24. What stage does supernumerary teeth occur?
Initiation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The apposition of the enamel matrix
Local or systemic or hereditary

25. What are the incremental lines for dentin?
Imbrication lines of von Ebner
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Preameloblasts
Bud stage

26. What happens when the reduced enamel epithelium is created?
A mineralized cylinder - the dentinal tubule
Imbrication lines of von Ebner
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
Dental tissues secreted as matrix in successive layers.

27. What is the predominate process of the cap stage?
Morphogenesis
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Epithelial

28. Tooth development
Odontogenesis
Tooth germ
Cementoblasts
Induction

29. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The bud stage
Preameloblasts
Enamel organ
Odontoclasts

30. Where is the dental papilla originally derived from?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ectomesenchyme - which was influenced by the neural crest cells
Dentin and alveolar bone
Apposition of the cementum

31. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Enamel pearl - enamel dysplasia - and concresence
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel organ

32. What are the clinical ramifications of anodontia?
The dental lamina
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary in localized form. endocrine dysfunction is complete

33. What happens during initiation?
A bilayer rim that consists only IEE and OEE
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
Tall columnar cells
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

34. When does macro/microdontia occur?
Dental papilla
Induction - proliferation
Bud stage
A bilayer rim that consists only IEE and OEE

35. What do the odontoblasts do?
Initiation stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

36. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The ameloblasts
The permanent molars
Tooth germ
Inner

37. When does dens in dente occur?
The dental sac
The ameloblasts place an acellular dental cuticle on the new enamel surface
During the cap stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

38. How is the dentinocemental junction formed?
Displacement of ameloblasts to root surface
Proliferation
Enamel
As a result of the apposition of cementum over dentin

39. What stage does anodontia occur?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Initiation stage
Imbrication lines of von Ebner
Proliferation

40. Which layer in the bell stage has star shaped cells?
Traumatic injury or crowding of teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The stellate reticulum
Development of one or more extra teeth

41. What are the developmental disturbances of the cap stage?
The ectoderm
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dens in dente - gemination - tubercle - and fusion
The ameloblasts place an acellular dental cuticle on the new enamel surface

42. What will the dental papilla eventually form?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The bud stage
Osteocytes
Future dentin and pulp tissue

43. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Absence of single or multiple teeth
The ectomesenchyme
Trauma - pressure or metabolic disease

44. What is anodontia?
The permanent molars
Induction
Into odontoblasts
Absence of single or multiple teeth

45. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Induction - proliferation
Epithelial rests of Malassez
Preameloblasts

46. Passive eruption
Inner
When the gingiva recedes and no actual tooth movement takes place
Osteoblasts
9th to 10th weeks

47. What kind of cells occur in the outer enamel epithelium in the bell stage?
The ameloblasts
Dental follicle
Cuboidal cells
Faulty development of enamel from interference involving ameloblasts

48. What are the etiological factors of tubercle?
Differentiation - proliferation - morphogenesis
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
Arrest and reversal lines
Trauma - pressure or metabolic disease

49. What is cementogenisis?
The enamel - dentin - and cementum are secreted in successive layers
Apposition of the cementum
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
9th to 10th weeks

50. What hard tissue is innervated by nerves?
The ectoderm
Dentin and alveolar bone
There is unequal growth in different parts of the tooth bud
The permanent molars

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Dentistry Tooth Development And Eruption

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