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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 dens in dente?
The outer cells of the dental papilla and the central cells of the dental papilla
Osteoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel organ invaginates into the dental papilla

2. What are the etiological factors for fusion?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Initiation stage
Osteocytes
Pressure on the area

3. What is the time span for the bud stage?
Initiation
8th week
The basement membrane that seperates the enamel organ and dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

4. What are the clinical ramifications of gemination?

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5. When does dens in dente occur?
During the cap stage
Dental tissues fully mineralize to their mature levels.
Hereditary
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

6. What are the clinical ramifications of fusion?
Differentiation - proliferation - morphogenesis
Proliferation - differentiation - morphogenesis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

7. What are the clinical ramifications of micro/macrodontia?
6th to 7th weeks
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ectomesenchyme
Local or systemic or hereditary

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

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9. What are the formative cells for cementum?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Cementoblasts
Odontoclasts
The actual vertical movement of the tooth

10. What is the main process involved in the bud stage?
Initiation stage
In the cap stage
The outer enamel epithelium
Proliferation

11. What are the etiological factors for micro/macrodontia?
As a result of the apposition of cementum over dentin
Proliferation - differentiation - morphogenesis
Enamel organ
Hereditary in localized form. endocrine dysfunction is complete

12. What is the structure responsible for root development?
Induction - proliferation
9th to 10th weeks
The cervical loop
Extra cusp due to effects on enamel organ

13. Passive eruption
Cuboidal cells
Cementoid
The actual vertical movement of the tooth
When the gingiva recedes and no actual tooth movement takes place

14. What layer serves as protection for the enamel organ?
Initiation
The enamel organ - dental papilla - dental sac
Proliferation
The outer enamel epithelium

15. What are the developmental disturbances of the cap stage?
Cementocytes
Dens in dente - gemination - tubercle - and fusion
Common with permanent maxillary molars
The permanent molars

16. What wll the inner enamel epithelium differentiate into?
6th to 7th weeks
Pressure on the area
Enamel secreting cells (ameloblasts)
Maturation

17. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Displacement of ameloblasts to root surface
Local or systemic or hereditary
Epithelial rests of Malassez
The ameloblasts place an acellular dental cuticle on the new enamel surface

18. What are the development disturbances of the apposition and maturation stages?
Epithelial rests of Malassez
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Faulty development of enamel from interference involving ameloblasts
Enamel pearl - enamel dysplasia - and concresence

19. What is tubercle?
The permanent molars
Extra cusp due to effects on enamel organ
Dental tissues fully mineralize to their mature levels.
Imbrication lines of von Ebner

20. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
In the cap stage
Absence of single or multiple teeth
Local or systemic or hereditary

21. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The ectomesenchyme
Tooth germ
The basement membrane
Abnormally small teeth

22. What is the primordium of the tooth?
The tooth germ
The ectomesenchyme
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer enamel epithelium

23. What hard tissue is can not have tissue formation after eruption?
Enamel
Alveolar bone
The apposition of the enamel matrix
Hereditary in localized form. endocrine dysfunction is complete

24. 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
The cementum - PDL - and alveolar bone
Into odontoblasts
Absence of single or multiple teeth

25. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Outer
Odontoclasts
Initiation stage
Tooth germ tries to divide

26. Do odontoblasts start their secretion of matrix before the ameloblasts?
Epithelial rests of Malassez
Maturation
A bilayer rim that consists only IEE and OEE
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

27. Where is the dental papilla originally derived from?
Differentiation
Dental tissues fully mineralize to their mature levels.
The ectomesenchyme - which was influenced by the neural crest cells
Common with permanent maxillary molars

28. What processes are involved with the apposition stage?
Induction
Compressed layer of flat to cuboidal cells
Induction - proliferation
Ameloblasts

29. When does macro/microdontia occur?
Bud stage
8th week
The dental sac
The outer enamel epithelium

30. What happens when the reduced enamel epithelium is created?
As a result of the apposition of cementum over dentin
Outer
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
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

31. What hard tissue has vascularity?
Compressed layer of flat to cuboidal cells
Tooth germ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Alveolar bone

32. What are the formative cells for dentin?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoblasts
The actual vertical movement of the tooth
Hereditary

33. What are the etiological factors for supernumerary teeth?
Initiation
Hereditary
Odontoblasts
Union of 2 adjacent tooth germs

34. What is the embryological background for dentin - cementum and alveolar bone?
Tooth germ
Dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Into odontoblasts

35. What happens during the bell stage?
The permanent molars
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

36. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Union of root structure of two or more teeth by cementum
Odontoblasts
May be confused as calculus deposit on root

37. What is anodontia?
Absence of single or multiple teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental papilla
The basement membrane that seperates the enamel organ and dental papilla

38. What is the embryological background for enamel?
Hereditary in localized form. endocrine dysfunction is complete
Dentin and alveolar bone
The actual vertical movement of the tooth
Enamel organ

39. What is the time span for initiation?
Differentiation - proliferation - morphogenesis
6th to 7th weeks
Lines of Retzuis
Morphogenesis

40. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Outer
It disintegrates as the developing oral mucosa comes to line the oral cavity
Absence of single or multiple teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

41. The stratum intermediate is located inner or outer?
Local or systemic or hereditary
During the cap stage
There is unequal growth in different parts of the tooth bud
Inner

42. What is matrix?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The cervical loop

43. Where is the enamal organ originally derived from?
Osteoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ameloblasts place an acellular dental cuticle on the new enamel surface
The ectoderm

44. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Bud stage
Apposition of the cementum
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

45. What is the process involved in the maturation stage?
Cementocytes
Maturation
Dentin secreting cells (odontoblats)
Hereditary

46. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Future dentin and pulp tissue

47. What are the etiological factors of concrescence?
As a result of the apposition of cementum over dentin
The ectomesenchyme - which was influenced by the neural crest cells
Traumatic injury or crowding of teeth
Morphogenesis

48. What is fusion?
Dentin secreting cells (odontoblats)
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Union of 2 adjacent tooth germs
Odontogenesis

49. The preameloblasts induce dental papilla cells to differentiate into what?
When the gingiva recedes and no actual tooth movement takes place
Into odontoblasts
The basement membrane
Cementoblasts

50. Which layer in the bell stage has star shaped cells?
The stellate reticulum
As a result of the apposition of cementum over dentin
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Union of root structure of two or more teeth by cementum

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Dentistry Tooth Development And Eruption

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