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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 stage does supernumerary teeth occur?
Enamel secreting cells (ameloblasts)
The outer enamel epithelium
6th to 7th weeks
Initiation

2. What are the clinical ramifications of micro/macrodontia?
Faulty development of enamel from interference involving ameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars

3. What will the dental sac give rise to?
Alveolar bone
Morphogenesis
Dentin and alveolar bone
The cementum - PDL - and alveolar bone

4. What is the embryological background for enamel?
Enamel pearl - enamel dysplasia - and concresence
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel organ
Tall columnar cells

5. What are the formative cells for cementum?
Cementoblasts
Odontoblasts
Displacement of ameloblasts to root surface
Arrest and reversal lines

6. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
In the cap stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
Inner

7. What are the etiological factors for micro/macrodontia?
The cementum - PDL - and alveolar bone
The outer enamel epithelium
The ectomesenchyme - which was influenced by the neural crest cells
Hereditary in localized form. endocrine dysfunction is complete

8. What stage does the dental tissues subsequently fully mineralize
Maturation
Absence of single or multiple teeth
Hereditary
Future dentin and pulp tissue

9. When does the tooth bud become a tooth germ?
The ectoderm
Abnormally large teeth
In the cap stage
Hereditary

10. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ
Odontoblasts

11. What happens during initiation?
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
Maturation
The ectoderm
Enamel

12. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
The ectomesenchyme - which was influenced by the neural crest cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Faulty development of enamel from interference involving ameloblasts

13. What is the time span for the bud stage?
A bilayer rim that consists only IEE and OEE
8th week
Dental follicle
Sphere of enamel on root

14. What is the main process involved in the bud stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Proliferation
The permanent molars
Sphere of enamel on root

15. What kind of cells reside in the stratum intermediate?
The ectomesenchyme
Development of one or more extra teeth
Compressed layer of flat to cuboidal cells
Osteoblasts

16. How many types of cells are found in the enamel organ in the bell stage?
Future dentin and pulp tissue
The ectoderm
4 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

17. What hard tissue is innervated by nerves?
The outer enamel epithelium
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 basement membrane
Dentin and alveolar bone

18. Which layer in the bell stage has star shaped cells?
Tooth germ
The stellate reticulum
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
8th week

19. What are the mature cells for enamel?
The cervical loop
There are none - they are lost with eruption
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The enamel - dentin - and cementum are secreted in successive layers

20. What is the primordium of the tooth?
A bilayer rim that consists only IEE and OEE
Outer
The cementum - PDL - and alveolar bone
The tooth germ

21. What else undergoes proliferation in the bud stage besides the dental lamina?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectomesenchyme
Cementoblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

22. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Union of 2 adjacent tooth germs
Local or systemic or hereditary

23. What is matrix?
Cementoid
The ectomesenchyme - which was influenced by the neural crest cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The ameloblasts place an acellular dental cuticle on the new enamel surface

24. What are the formative cells for enamel?
Ameloblasts
Enamel
A bilayer rim that consists only IEE and OEE
Osteocytes

25. What wll the inner enamel epithelium differentiate into?
The permanent molars
Enamel secreting cells (ameloblasts)
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Proliferation - differentiation - morphogenesis

26. What are the clinical ramifications of gemination?

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27. What is the predominate process of the cap stage?
Morphogenesis
Compressed layer of flat to cuboidal cells
Odontoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

28. What is the process involved in the maturation stage?
Maturation
Preameloblasts
Lines of Retzuis
8th week

29. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Cementoid
The dental sac
Hereditary in localized form. endocrine dysfunction is complete
The permanent molars

30. What type of tissue is enamel?
Epithelial
Into odontoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation - proliferation - morphogenesis

31. What are entrapped cementoblasts called?
Cementocytes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
11th to 12th weeks

32. Which teeth are nonsuccedaneous?
Only dentinal tubules with processes
Local or systemic or hereditary
The permanent molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

33. Where is the dental sac originally derived from?
The ectomesenchyme
Cuboidal cells
Dens in dente - gemination - tubercle - and fusion
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

34. What is concrescence?
Union of root structure of two or more teeth by cementum
9th to 10th weeks
There is unequal growth in different parts of the tooth bud
Only dentinal tubules with processes

35. What is an enamel pearl?
Union of root structure of two or more teeth by cementum
Enamel organ
Sphere of enamel on root
Dentin secreting cells (odontoblats)

36. What are the processes involved in the cap stage?
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
Proliferation - differentiation - morphogenesis
Dental follicle

37. What is the time span for the bell stage?
11th to 12th weeks
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The enamel organ is compressed
Odontoclasts

38. What are the etiological factors of concrescence?
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
Traumatic injury or crowding of teeth
Hereditary

39. Active eruption
There is unequal growth in different parts of the tooth bud
The actual vertical movement of the tooth
Epithelial
The apposition of the enamel matrix

40. Where does the primordium of the permanent dentition develop?
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
In the cap stage
Osteocytes

41. What are the etiological factors for fusion?
Traumatic injury or crowding of teeth
The basement membrane that seperates the enamel organ and dental papilla
Pressure on the area
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

42. What is the time span for the cap stage?
Cementoid
The cementum - PDL - and alveolar bone
9th to 10th weeks
Tooth germ

43. What is the main process involved in initiation?
Cementoblasts
Induction
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Alveolar bone

44. What will the outer cells of the dental lamina differentiate into?
Proliferation - differentiation - morphogenesis
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
Tooth germ
Dentin secreting cells (odontoblats)

45. What is cementogenisis?
Odontoblasts
Apposition of the cementum
Cementoblasts
Common with permanent maxillary molars

46. What is enamel dysplasia?
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
Connective
Faulty development of enamel from interference involving ameloblasts
Epithelial

47. What are the clinical ramifications of enamel dysplasia?
Dental papilla
The basement membrane that seperates the enamel organ and dental papilla
There are none - they are lost with eruption
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

48. In the cap stage the tooth bud does not grow - what happens?
The apposition of the enamel matrix
There is unequal growth in different parts of the tooth bud
Osteoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

49. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
8th week
The bud stage
Tall columnar cells
Enamel pearl - enamel dysplasia - and concresence

50. The stellate reticulum is located inner or outer?
Trauma - pressure or metabolic disease
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
Outer
Abnormally small teeth

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Dentistry Tooth Development And Eruption

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