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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 the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
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
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Cementocytes

2. What is the site for the future dentioenamel junction?
During the cap stage
Induction
The basement membrane that seperates the enamel organ and dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

3. What is the time span for the cap stage?
9th to 10th weeks
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Morphogenesis
Enamel secreting cells (ameloblasts)

4. What layer serves as protection for the enamel organ?
Initiation
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ectoderm
The outer enamel epithelium

5. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Cementoblasts
Arrest and reversal lines
Common on permanent molars or cingulum of anterior teeth

6. What are the etiological factors for enamel pearl?
The outer cells of the dental papilla and the central cells of the dental papilla
Dens in dente - gemination - tubercle - and fusion
Displacement of ameloblasts to root surface
Abnormally large teeth

7. What is the structure responsible for root development?
The cervical loop
Odontoclasts
The dental lamina
The ameloblasts

8. What are the mature cells for cementum?
4 types
As a result of the apposition of cementum over dentin
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementocytes

9. What is the main process involved in initiation?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
4 types
Induction
Tooth germ

10. What is the outer portion of the ectoderm in the initiation stage?
The ectomesenchyme
Odontoblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Oral epithelium

11. What are the clinical ramifications of enamel pearl?
Alveolar bone
May be confused as calculus deposit on root
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The enamel - dentin - and cementum are secreted in successive layers

12. What hard tissue is innervated by nerves?
Dentin secreting cells (odontoblats)
Dentin and alveolar bone
Oral epithelium
Abnormally small teeth

13. How many types of cells are found in the enamel organ in the bell stage?
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
The basement membrane
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
4 types

14. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Cuboidal cells
The tooth germ
Enamel pearl - enamel dysplasia - and concresence
The bud stage

15. What is the predominate process of the cap stage?
Morphogenesis
The ectoderm
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel organ

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

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17. What is the main process involved in the bud stage?
Proliferation
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
The dental lamina
Dental papilla

18. What is the cap in the cap stage?
Cementocytes
The ectomesenchyme
Induction - proliferation
The enamel organ

19. What hard tissue has vascularity?
Inner
During the cap stage
Alveolar bone
Differentiation - proliferation - morphogenesis

20. What are the formative cells for enamel?
Dental follicle
Odontoclasts
Ameloblasts
Dental papilla

21. What is the time span for initiation?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
6th to 7th weeks
Outer
Lines of Retzuis

22. What is the process involved in the maturation stage?
Hereditary
The stellate reticulum
Maturation
The enamel - dentin - and cementum are secreted in successive layers

23. What is enamel dysplasia?
Maturation
Faulty development of enamel from interference involving ameloblasts
Hereditary
The apposition of the enamel matrix

24. What happens during the appositional stage?
Into odontoblasts
Abnormally small teeth
The enamel - dentin - and cementum are secreted in successive layers
Maturation

25. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
9th to 10th weeks
Lines of Retzuis
Morphogenesis
Odontoblastic process

26. What are the clinical ramifications?
The primordium of the pulp
Trauma - pressure or metabolic disease
Common on permanent molars or cingulum of anterior teeth
Hereditary

27. What is the time span for the bell stage?
11th to 12th weeks
Tooth germ
Proliferation
As a result of the apposition of cementum over dentin

28. What are the formative cells for cementum?
Morphogenesis
Epithelial rests of Malassez
Dens in dente - gemination - tubercle - and fusion
Cementoblasts

29. What are the formative cells for alveolar bone?
Osteoblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
Common with permanent maxillary molars
The enamel organ is compressed

30. What are the clinical ramifications of dens in dente?
4 types
The basement membrane that seperates the enamel organ and dental papilla
Tall columnar cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

31. What will the dental papilla eventually form?
Epithelial
The outer enamel epithelium
Alveolar bone
Future dentin and pulp tissue

32. What is the embryological background for dentin - cementum and alveolar bone?
Inner
Dental papilla
A bilayer rim that consists only IEE and OEE
Faulty development of enamel from interference involving ameloblasts

33. What kind of cells occur in the outer enamel epithelium in the bell stage?
The actual vertical movement of the tooth
As a result of the apposition of cementum over dentin
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
Cuboidal cells

34. What happens during the cap stage?
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.
The outer cells of the dental papilla and the central cells of the dental papilla
The ectoderm
Proliferation

35. What wll the inner enamel epithelium differentiate into?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The basement membrane
Enamel secreting cells (ameloblasts)
Dental papilla

36. What are the etiological factors for dens in dente and gemination?
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
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

37. What is tubercle?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Extra cusp due to effects on enamel organ
Faulty development of enamel from interference involving ameloblasts
There are none - they are lost with eruption

38. What processes are involved in the bell stage?
8th week
Future dentin and pulp tissue
Maturation
Differentiation - proliferation - morphogenesis

39. What type of tissue is dentin - cementum - and alveolar bone?
The enamel organ is compressed
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
Connective
Maturation

40. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The dental sac
Trauma - pressure or metabolic disease
The enamel organ is compressed

41. What are the clinical ramifications of gemination?

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42. What are the etiological factors for supernumerary teeth?
The apposition of the enamel matrix
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
The stellate reticulum
Hereditary

43. Where is the dental sac originally derived from?
Osteocytes
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
The ectomesenchyme
Odontoblastic process

44. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Dentin and alveolar bone
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Local or systemic or hereditary

45. What are the developmental disturbances of the cap stage?
There are none - they are lost with eruption
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Tooth germ
Dens in dente - gemination - tubercle - and fusion

46. What will the outer cells of the dental lamina differentiate into?
Tooth germ tries to divide
A mineralized cylinder - the dentinal tubule
9th to 10th weeks
Dentin secreting cells (odontoblats)

47. What is another name for 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
Hereditary in localized form. endocrine dysfunction is complete
Pressure on the area
Dental follicle

48. What stage does supernumerary teeth occur?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Alveolar bone
Initiation
Compressed layer of flat to cuboidal cells

49. When does dens in dente occur?
The ectomesenchyme
During the cap stage
Preameloblasts
A mineralized cylinder - the dentinal tubule

50. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The dental lamina
Enamel secreting cells (ameloblasts)
Dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

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Dentistry Tooth Development And Eruption

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