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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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1. What is microdontia?
Abnormally small teeth
Enamel
Abnormally large teeth
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

2. What happens when the reduced enamel epithelium is created?
Abnormally large teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
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
Dens in dente - gemination - tubercle - and fusion

3. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Common on permanent molars or cingulum of anterior teeth
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
Enamel organ

4. What are the clinical ramifications of gemination?

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5. What are the incremental lines for dentin?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The bud stage
Imbrication lines of von Ebner
Cementocytes

6. What is the main process involved in initiation?
Epithelial rests of Malassez
In the cap stage
Induction
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

7. What are the clinical ramifications?
Dentin secreting cells (odontoblats)
Lines of Retzuis
Tooth germ
Common on permanent molars or cingulum of anterior teeth

8. What wll the inner enamel epithelium differentiate into?
The cervical loop
The actual vertical movement of the tooth
Enamel secreting cells (ameloblasts)
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

9. What is gemination?
Tooth germ tries to divide
Local or systemic or hereditary
Dental tissues secreted as matrix in successive layers.
Displacement of ameloblasts to root surface

10. What is fusion?
Imbrication lines of von Ebner
May be confused as calculus deposit on root
Union of 2 adjacent tooth germs
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

11. Where is the dental sac originally derived from?
Into odontoblasts
The enamel organ
The ectomesenchyme
Abnormally large teeth

12. Where does the primordium of the permanent dentition develop?
Cuboidal cells
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The primordium of the pulp

13. What does the cervical loop consist of?
Hereditary in localized form. endocrine dysfunction is complete
Alveolar bone
Enamel organ
A bilayer rim that consists only IEE and OEE

14. What is the time span for initiation?
Outer
The ameloblasts place an acellular dental cuticle on the new enamel surface
6th to 7th weeks
Bud stage

15. What is amelogenisis?
As a result of the apposition of cementum over dentin
The apposition of the enamel matrix
Apposition of the cementum
Enamel pearl - enamel dysplasia - and concresence

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

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17. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental follicle
The basement membrane
Differentiation

18. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Into odontoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Ameloblasts

19. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The enamel organ - dental papilla - dental sac
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontoclasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

20. In the cap stage the tooth bud does not grow - what happens?
Enamel organ
There is unequal growth in different parts of the tooth bud
9th to 10th weeks
Proliferation - differentiation - morphogenesis

21. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Inner
The ectomesenchyme - which was influenced by the neural crest cells
Extra cusp due to effects on enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

22. What stage does anodontia occur?
Displacement of ameloblasts to root surface
Initiation stage
Hereditary in localized form. endocrine dysfunction is complete
9th to 10th weeks

23. What is dens in dente?
May be confused as calculus deposit on root
Preameloblasts
Enamel organ invaginates into the dental papilla
Osteoblasts

24. Passive eruption
Lines of Retzuis
Induction
When the gingiva recedes and no actual tooth movement takes place
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

25. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Union of root structure of two or more teeth by cementum
Local or systemic or hereditary
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The dental sac

26. What is cementogenisis?
6th to 7th weeks
Apposition of the cementum
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ameloblasts

27. How is the reduced enamel epithelium created?
The enamel organ is compressed
The tooth germ
Morphogenesis
The enamel organ

28. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Union of root structure of two or more teeth by cementum
The stellate reticulum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

29. The oral epithelium is induced by the ectomesenchyme to produce what?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Common with permanent maxillary molars
Traumatic injury or crowding of teeth
The dental lamina

30. What are the mature cells for dentin?
May be confused as calculus deposit on root
Common on permanent molars or cingulum of anterior teeth
Abnormally large teeth
Only dentinal tubules with processes

31. What are the etiological factors for anodontia?
Compressed layer of flat to cuboidal cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Ameloblasts
Initiation

32. How is the dentinocemental junction formed?
The outer enamel epithelium
The primordium of the pulp
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
As a result of the apposition of cementum over dentin

33. Where is the enamal organ originally derived from?
Morphogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface
The enamel - dentin - and cementum are secreted in successive layers
The ectoderm

34. What happens during initiation?
The ectomesenchyme
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
The basement membrane that seperates the enamel organ and dental papilla
Epithelial rests of Malassez

35. What are the etiological factors for fusion?
Future dentin and pulp tissue
Enamel organ invaginates into the dental papilla
Pressure on the area
Oral epithelium

36. What is the process involved in the maturation stage?
The tooth germ
Traumatic injury or crowding of teeth
Tall columnar cells
Maturation

37. What layer serves as protection for the enamel organ?
As a result of the apposition of cementum over dentin
Tooth germ tries to divide
The outer enamel epithelium
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.

38. What is matrix?
Connective
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Maturation
Hereditary

39. What is the primordium of the tooth?
Union of 2 adjacent tooth germs
The outer cells of the dental papilla and the central cells of the dental papilla
Initiation
The tooth germ

40. What is the main process involved in the bud stage?
The ectoderm
Faulty development of enamel from interference involving ameloblasts
Enamel secreting cells (ameloblasts)
Proliferation

41. What are the mature cells for alveolar bone?
The ectomesenchyme
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
Future dentin and pulp tissue
Osteocytes

42. When does dens in dente occur?
During the cap stage
Odontoblastic process
A mineralized cylinder - the dentinal tubule
Differentiation - proliferation - morphogenesis

43. What are the formative cells for cementum?
Dental papilla
Into odontoblasts
Odontoblasts
Cementoblasts

44. What are the incremental lines for cementum and alveolar bone?
The basement membrane that seperates the enamel organ and dental papilla
Abnormally small teeth
Arrest and reversal lines
The enamel organ

45. What are the formative cells for enamel?
Ameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The primordium of the pulp
Imbrication lines of von Ebner

46. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Lines of Retzuis
The ameloblasts place an acellular dental cuticle on the new enamel surface
A mineralized cylinder - the dentinal tubule
Cementocytes

47. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Displacement of ameloblasts to root surface
Enamel secreting cells (ameloblasts)
Cementoblasts

48. What happens during the bell stage?
The cervical loop
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Sphere of enamel on root
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

49. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
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
Oral epithelium

50. What happens during the bud stage?
The tooth germ
Cuboidal cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Osteocytes

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Dentistry Tooth Development And Eruption

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