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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 hard tissue is innervated by nerves?
Compressed layer of flat to cuboidal cells
Tooth germ tries to divide
The apposition of the enamel matrix
Dentin and alveolar bone

2. What are the etiological factors of tubercle?
6th to 7th weeks
Trauma - pressure or metabolic disease
There are none - they are lost with eruption
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

3. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The ectomesenchyme - which was influenced by the neural crest cells
Proliferation - differentiation - morphogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Epithelial rests of Malassez

4. What is the structure responsible for root development?
Cementocytes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The cervical loop
A mineralized cylinder - the dentinal tubule

5. What happens during the cap stage?
Outer
Abnormally small teeth
Morphogenesis
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.

6. What is another name for the dental sac?
Dental follicle
The actual vertical movement of the tooth
The ectomesenchyme
Proliferation

7. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The stellate reticulum
Odontoclasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

8. Which teeth are nonsuccedaneous?
Pressure on the area
The primordium of the pulp
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The permanent molars

9. How is the dentinocemental junction formed?
The dental sac
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
As a result of the apposition of cementum over dentin
The apposition of the enamel matrix

10. Where is the dental papilla originally derived from?
Enamel
The ectomesenchyme - which was influenced by the neural crest cells
Cementoblasts
The bud stage

11. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
The dental sac
Osteoblasts
Only dentinal tubules with processes

12. What are the clinical ramifications of anodontia?
Local or systemic or hereditary
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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
May be confused as calculus deposit on root

13. What layer serves as protection for the enamel organ?
Dental papilla
Common on permanent molars or cingulum of anterior teeth
The outer enamel epithelium
Compressed layer of flat to cuboidal cells

14. What is the process involved in the maturation stage?
The apposition of the enamel matrix
Maturation
11th to 12th weeks
Epithelial rests of Malassez

15. What are the formative cells for cementum?
The outer cells of the dental papilla and the central cells of the dental papilla
Cementoblasts
Odontoclasts
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

16. What happens during the maturation stage?
The outer cells of the dental papilla and the central cells of the dental papilla
Dental tissues fully mineralize to their mature levels.
Induction
Abnormally small teeth

17. 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 successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
There are none - they are lost with eruption
The stellate reticulum

18. When does macro/microdontia occur?
Ameloblasts
Bud stage
11th to 12th weeks
Odontoclasts

19. What is the predominate process of the cap stage?
Common on permanent molars or cingulum of anterior teeth
Union of 2 adjacent tooth germs
Morphogenesis
In the cap stage

20. What will the dental papilla eventually form?
Extra cusp due to effects on enamel organ
A mineralized cylinder - the dentinal tubule
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Future dentin and pulp tissue

21. What are entrapped cementoblasts called?
Cementocytes
The cementum - PDL - and alveolar bone
Maturation
Alveolar bone

22. What else undergoes proliferation in the bud stage besides the dental lamina?
Induction - proliferation
The ectomesenchyme
Hereditary
Dental papilla

23. What happens during the apposition stage?
The basement membrane
Dental tissues secreted as matrix in successive layers.
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Tall columnar cells

24. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Arrest and reversal lines
Dental papilla
Dental papilla

25. What are the formative cells for enamel?
Ameloblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Tooth germ tries to divide

26. What are the odontoblastic processes is contained in what?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Apposition of the cementum
Bud stage
A mineralized cylinder - the dentinal tubule

27. What are the development disturbances of the apposition and maturation stages?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel pearl - enamel dysplasia - and concresence
The enamel - dentin - and cementum are secreted in successive layers

28. When does the process of root development take place?
Differentiation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The bud stage
Imbrication lines of von Ebner

29. What kind of cells occur in the inner enamel epithelium?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Tall columnar cells
Proliferation
The basement membrane

30. Where is the dental sac originally derived from?
Induction
Alveolar bone
The ectomesenchyme
There is unequal growth in different parts of the tooth bud

31. What are the etiological factors for micro/macrodontia?
The ectoderm
Only dentinal tubules with processes
Abnormally large teeth
Hereditary in localized form. endocrine dysfunction is complete

32. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Cementocytes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Epithelial rests of Malassez

33. What is the predominate process in the bell stage?
Dens in dente - gemination - tubercle - and fusion
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
Differentiation
When the gingiva recedes and no actual tooth movement takes place

34. What stage does supernumerary teeth occur?
The permanent molars
Initiation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental tissues secreted as matrix in successive layers.

35. What are the cell layers found in the enamel organ in the bell stage?
Cuboidal cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel organ

36. What are the etiological factors for supernumerary teeth?
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.
Development of one or more extra teeth
The ectoderm
Hereditary

37. What is tubercle?
The outer enamel epithelium
Extra cusp due to effects on enamel organ
As a result of the apposition of cementum over dentin
The apposition of the enamel matrix

38. What is microdontia?
Abnormally small teeth
There is unequal growth in different parts of the tooth bud
Only dentinal tubules with processes
When the gingiva recedes and no actual tooth movement takes place

39. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Initiation stage
Bud stage
4 types

40. What are the mature cells for alveolar bone?
Osteocytes
A bilayer rim that consists only IEE and OEE
Odontoblasts
Arrest and reversal lines

41. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Odontogenesis
Common on permanent molars or cingulum of anterior teeth
The enamel - dentin - and cementum are secreted in successive layers
Tooth germ

42. What is gemination?
The stellate reticulum
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dentin secreting cells (odontoblats)
Tooth germ tries to divide

43. What happens during the appositional stage?
Enamel pearl - enamel dysplasia - and concresence
The enamel - dentin - and cementum are secreted in successive layers
Dentin secreting cells (odontoblats)
Abnormally large teeth

44. What is dens in dente?
The ectomesenchyme - which was influenced by the neural crest cells
Ameloblasts
Enamel organ invaginates into the dental papilla
The cementum - PDL - and alveolar bone

45. What are the clinical ramifications of enamel pearl?
6th to 7th weeks
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
May be confused as calculus deposit on root
Tooth germ tries to divide

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

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47. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementoblasts
The basement membrane
As a result of the apposition of cementum over dentin

48. In the cap stage the tooth bud does not grow - what happens?
Differentiation - proliferation - morphogenesis
There is unequal growth in different parts of the tooth bud
Cementocytes
Arrest and reversal lines

49. What is macrodontia?
Abnormally large teeth
Proliferation - differentiation - morphogenesis
In the cap stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

50. What is the embryological background for dentin - cementum and alveolar bone?
Odontoclasts
As a result of the apposition of cementum over dentin
The enamel organ is compressed
Dental papilla

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Dentistry Tooth Development And Eruption

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