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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. When does macro/microdontia occur?
Compressed layer of flat to cuboidal cells
Oral epithelium
Common with permanent maxillary molars
Bud stage

2. What are the etiological factors for dens in dente and gemination?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Hereditary
The enamel organ - dental papilla - dental sac
The bud stage

3. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Abnormally small teeth
The cementum - PDL - and alveolar bone
Preameloblasts
Future dentin and pulp tissue

4. What hard tissue has vascularity?
Epithelial rests of Malassez
Alveolar bone
The cementum - PDL - and alveolar bone
As a result of the apposition of cementum over dentin

5. What are the mature cells for enamel?
There are none - they are lost with eruption
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
When the gingiva recedes and no actual tooth movement takes place
Oral epithelium

6. When does the tooth bud become a tooth germ?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The apposition of the enamel matrix
In the cap stage
The bud stage

7. What will the dental sac give rise to?
Connective
The cementum - PDL - and alveolar bone
Compressed layer of flat to cuboidal cells
8th week

8. What is fusion?
Union of 2 adjacent tooth germs
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
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla

9. What are the etiological factors for micro/macrodontia?
The bud stage
Hereditary in localized form. endocrine dysfunction is complete
Odontoblasts
Cementoblasts

10. What are the etiological factors of enamel dysplasia?
Odontoblastic process
Local or systemic or hereditary
Osteocytes
Dental tissues fully mineralize to their mature levels.

11. What else undergoes proliferation in the bud stage besides the dental lamina?
Dental tissues secreted as matrix in successive layers.
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme

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

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13. What stage does anodontia occur?
Cementocytes
Pressure on the area
Initiation stage
The cervical loop

14. What is anodontia?
Absence of single or multiple teeth
Union of 2 adjacent tooth germs
Epithelial
The dental lamina

15. What are the clinical ramifications of gemination?

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16. What stage does the dental tissues subsequently fully mineralize
Lines of Retzuis
Maturation
The basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

17. Passive eruption
Proliferation - differentiation - morphogenesis
When the gingiva recedes and no actual tooth movement takes place
Development of one or more extra teeth
Enamel organ invaginates into the dental papilla

18. What are the incremental lines for enamel?
Lines of Retzuis
Dens in dente - gemination - tubercle - and fusion
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
A mineralized cylinder - the dentinal tubule

19. Where is the dental papilla originally derived from?
Dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ectomesenchyme - which was influenced by the neural crest cells
Cementocytes

20. Where is the dental sac originally derived from?
Induction
Only dentinal tubules with processes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ectomesenchyme

21. What is the process involved in the maturation stage?
4 types
Only dentinal tubules with processes
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
Maturation

22. What layer serves as protection for the enamel organ?
The apposition of the enamel matrix
Apposition of the cementum
The outer enamel epithelium
4 types

23. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Sphere of enamel on root
Differentiation - proliferation - morphogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

24. What is gemination?
The bud stage
Hereditary
Tooth germ tries to divide
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

25. What are the etiological factors for supernumerary teeth?
Tooth germ
The actual vertical movement of the tooth
Hereditary
Imbrication lines of von Ebner

26. What is the predominate process of the cap stage?
Morphogenesis
The outer cells of the dental papilla and the central cells of the dental papilla
Displacement of ameloblasts to root surface
Development of one or more extra teeth

27. What kind of cells occur in the outer enamel epithelium in the bell stage?
The apposition of the enamel matrix
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cuboidal cells
The enamel - dentin - and cementum are secreted in successive layers

28. What does the cervical loop consist of?
Cementoblasts
The actual vertical movement of the tooth
The ectoderm
A bilayer rim that consists only IEE and OEE

29. What happens during initiation?
Proliferation - differentiation - morphogenesis
Development of one or more extra teeth
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
Local or systemic or hereditary

30. What is enamel dysplasia?
4 types
Faulty development of enamel from interference involving ameloblasts
Tall columnar cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

31. What is the main process involved in the bud stage?
The ameloblasts
Osteocytes
Proliferation
4 types

32. What are the etiological factors for anodontia?
The outer enamel epithelium
Proliferation
Into odontoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

33. What is the time span for the bud stage?
The enamel - dentin - and cementum are secreted in successive layers
Enamel organ invaginates into the dental papilla
8th week
Cementoblasts

34. What is the time span for the bell stage?
Arrest and reversal lines
Absence of single or multiple teeth
11th to 12th weeks
As a result of the apposition of cementum over dentin

35. What kind of cells occur in the inner enamel epithelium?
Hereditary
The ectoderm
Tall columnar cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

36. What are the formative cells for dentin?
Osteocytes
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
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Odontoblasts

37. What are the clinical ramifications of concrescence?
Pressure on the area
Ameloblasts
Common with permanent maxillary molars
Enamel organ invaginates into the dental papilla

38. What are the cell layers found in the enamel organ in the bell stage?
Cementocytes
Maturation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The enamel organ

39. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The apposition of the enamel matrix
The ectomesenchyme
The basement membrane

40. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Preameloblasts
Odontoclasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

41. What are the etiological factors of concrescence?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Traumatic injury or crowding of teeth
6th to 7th weeks
Proliferation - differentiation - morphogenesis

42. What happens during the bud stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Epithelial
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
As a result of the apposition of cementum over dentin

43. The stratum intermediate is located inner or outer?
Inner
The ectoderm
Trauma - pressure or metabolic disease
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

44. The stellate reticulum is located inner or outer?
Outer
Induction - proliferation
Cementoblasts
The enamel organ - dental papilla - dental sac

45. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The dental lamina
When the gingiva recedes and no actual tooth movement takes place
Common on permanent molars or cingulum of anterior teeth
Odontoclasts

46. What are the formative cells for alveolar bone?
The actual vertical movement of the tooth
The enamel - dentin - and cementum are secreted in successive layers
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Osteoblasts

47. The preameloblasts induce dental papilla cells to differentiate into what?
The permanent molars
Traumatic injury or crowding of teeth
Into odontoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

48. What is the structure responsible for root development?
The cervical loop
May be confused as calculus deposit on root
The ectomesenchyme - which was influenced by the neural crest cells
Only dentinal tubules with processes

49. How many types of cells are found in the enamel organ in the bell stage?
4 types
Enamel secreting cells (ameloblasts)
Trauma - pressure or metabolic disease
Union of 2 adjacent tooth germs

50. What stage does supernumerary teeth occur?
Compressed layer of flat to cuboidal cells
The outer cells of the dental papilla and the central cells of the dental papilla
Initiation
Tooth germ tries to divide