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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. Where is the dental papilla originally derived from?
Cementoid
The ectomesenchyme - which was influenced by the neural crest cells
Imbrication lines of von Ebner
The dental lamina

2. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
It disintegrates as the developing oral mucosa comes to line the oral cavity
6th to 7th weeks

3. Where does the primordium of the permanent dentition develop?
Induction
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Local or systemic or hereditary

4. What are the etiological factors for supernumerary teeth?
4 types
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Only dentinal tubules with processes
Hereditary

5. The stratum intermediate is located inner or outer?
The ectomesenchyme
Inner
During the cap stage
Tooth germ tries to divide

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

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7. What is the primordium of the tooth?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The tooth germ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

8. What are supernumerary teeth?
Dental papilla
Development of one or more extra teeth
Tall columnar cells
Arrest and reversal lines

9. Do odontoblasts start their secretion of matrix before the ameloblasts?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There is unequal growth in different parts of the tooth bud
The actual vertical movement of the tooth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

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

11. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Induction
Dental tissues secreted as matrix in successive layers.
Initiation stage

12. Active eruption
The basement membrane
Hereditary in localized form. endocrine dysfunction is complete
The actual vertical movement of the tooth
Odontoblasts

13. What stage does anodontia occur?
Initiation stage
Hereditary
Dental tissues fully mineralize to their mature levels.
Outer

14. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Cuboidal cells
The outer cells of the dental papilla and the central cells of the dental papilla
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

15. What are the formative cells for alveolar bone?
Enamel
Osteoblasts
The basement membrane
Cementoid

16. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The basement membrane
Inner
Commonly involves permanent maxillary lateral incisor and 3rd molars

17. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
A bilayer rim that consists only IEE and OEE
Union of 2 adjacent tooth germs
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

18. What are the major components of the tooth germ?
The primordium of the pulp
8th week
The enamel organ - dental papilla - dental sac
Odontoclasts

19. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Abnormally large teeth
Induction
Maturation

20. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
In the cap stage
The bud stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The basement membrane

21. What is the embryological background for enamel?
Traumatic injury or crowding of teeth
The bud stage
The enamel organ - dental papilla - dental sac
Enamel organ

22. What happens during the bell stage?
Extra cusp due to effects on enamel organ
The enamel organ - dental papilla - dental sac
The ameloblasts place an acellular dental cuticle on the new enamel surface
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

23. What hard tissue has vascularity?
Alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Arrest and reversal lines
Extra cusp due to effects on enamel organ

24. What are the clinical ramifications of gemination?

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25. When does dens in dente occur?
Cementocytes
During the cap stage
Sphere of enamel on root
Differentiation - proliferation - morphogenesis

26. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
4 types
Odontoblasts
The bud stage
The ectomesenchyme

27. What is the cap in the cap stage?
Induction
The enamel organ
Union of 2 adjacent tooth germs
Extra cusp due to effects on enamel organ

28. What are the etiological factors for enamel pearl?
The tooth germ
Displacement of ameloblasts to root surface
Sphere of enamel on root
The apposition of the enamel matrix

29. What is fusion?
May be confused as calculus deposit on root
Sphere of enamel on root
Common on permanent molars or cingulum of anterior teeth
Union of 2 adjacent tooth germs

30. What stage does the dental tissues subsequently fully mineralize
The ectomesenchyme
Maturation
Proliferation
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

31. What is dens in dente?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel organ invaginates into the dental papilla
Initiation
The enamel - dentin - and cementum are secreted in successive layers

32. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoclasts
The cementum - PDL - and alveolar bone

33. What are the formative cells for dentin?
Odontoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Arrest and reversal lines
Proliferation

34. What happens during the maturation stage?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental tissues fully mineralize to their mature levels.
When the gingiva recedes and no actual tooth movement takes place
Enamel organ

35. What type of tissue is enamel?
Dental tissues fully mineralize to their mature levels.
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Epithelial
The tooth germ

36. What layer serves as protection for the enamel organ?
The enamel - dentin - and cementum are secreted in successive layers
11th to 12th weeks
Faulty development of enamel from interference involving ameloblasts
The outer enamel epithelium

37. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
In the cap stage
Odontoblastic process
Cuboidal cells
Bud stage

38. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Union of root structure of two or more teeth by cementum
The cementum - PDL - and alveolar bone

39. What are the incremental lines for dentin?
Initiation
Imbrication lines of von Ebner
Morphogenesis
Enamel secreting cells (ameloblasts)

40. Passive eruption
Osteocytes
9th to 10th weeks
The basement membrane
When the gingiva recedes and no actual tooth movement takes place

41. What do the odontoblasts do?
The basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
The basement membrane that seperates the enamel organ and dental papilla
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

42. What is tubercle?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Maturation
Extra cusp due to effects on enamel organ
Tooth germ

43. What are the mature cells for cementum?
Cementocytes
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The basement membrane that seperates the enamel organ and dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

44. What kind of cells occur in the outer enamel epithelium in the bell stage?
Preameloblasts
The basement membrane
Cuboidal cells
Hereditary

45. What kind of cells reside in the stratum intermediate?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Compressed layer of flat to cuboidal cells
Union of root structure of two or more teeth by cementum
6th to 7th weeks

46. What is concrescence?
Differentiation - proliferation - morphogenesis
Enamel organ invaginates into the dental papilla
Union of root structure of two or more teeth by cementum
The dental lamina

47. What are the clinical ramifications of anodontia?
Displacement of ameloblasts to root surface
Odontoblastic process
Trauma - pressure or metabolic disease
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

48. What type of tissue is dentin - cementum - and alveolar bone?
The ectoderm
The cementum - PDL - and alveolar bone
Connective
It disintegrates as the developing oral mucosa comes to line the oral cavity

49. What are entrapped cementoblasts called?
Odontoclasts
Faulty development of enamel from interference involving ameloblasts
Absence of single or multiple teeth
Cementocytes

50. What are the incremental lines for enamel?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel organ is compressed
Dental papilla
Lines of Retzuis