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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. What will the dental papilla eventually form?
Abnormally large teeth
Displacement of ameloblasts to root surface
The stellate reticulum
Future dentin and pulp tissue

2. What happens during the appositional stage?
Cementocytes
The enamel - dentin - and cementum are secreted in successive layers
Odontoblastic process
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

3. What layer serves as protection for the enamel organ?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ameloblasts place an acellular dental cuticle on the new enamel surface
The outer enamel epithelium
Dental follicle

4. What are the development disturbances of the apposition and maturation stages?
The enamel organ is compressed
Common with permanent maxillary molars
Enamel pearl - enamel dysplasia - and concresence
Commonly involves permanent maxillary lateral incisor and 3rd molars

5. What kind of cells occur in the inner enamel epithelium?
Union of 2 adjacent tooth germs
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tall columnar cells
Oral epithelium

6. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The outer enamel epithelium
Abnormally small teeth
There is unequal growth in different parts of the tooth bud

7. Where is the dental sac originally derived from?
Outer
The ectomesenchyme
The basement membrane
Imbrication lines of von Ebner

8. When does the process of root development take place?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial rests of Malassez
Induction - proliferation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

9. What happens during initiation?
The basement membrane
Extra cusp due to effects on enamel organ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
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

10. What are the clinical ramifications of enamel dysplasia?
Arrest and reversal lines
Initiation stage
Union of 2 adjacent tooth germs
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

11. What causes the induction of the preameloblasts to differentiate into ameloblasts?
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
Odontoblastic process
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

12. What stage does the dental tissues subsequently fully mineralize
Maturation
The actual vertical movement of the tooth
The cementum - PDL - and alveolar bone
Abnormally small teeth

13. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Dental papilla
Maturation
Initiation stage

14. What are the major components of the tooth germ?
Dental tissues fully mineralize to their mature levels.
Apposition of the cementum
Commonly involves permanent maxillary lateral incisor and 3rd molars
The enamel organ - dental papilla - dental sac

15. The oral epithelium is induced by the ectomesenchyme to produce what?
As a result of the apposition of cementum over dentin
The outer cells of the dental papilla and the central cells of the dental papilla
The dental lamina
Cementocytes

16. What are the etiological factors for fusion?
Union of 2 adjacent tooth germs
Displacement of ameloblasts to root surface
Pressure on the area
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

17. In the cap stage the tooth bud does not grow - what happens?
Enamel pearl - enamel dysplasia - and concresence
Initiation
There is unequal growth in different parts of the tooth bud
Arrest and reversal lines

18. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
The basement membrane that seperates the enamel organ and dental papilla
There are none - they are lost with eruption
9th to 10th weeks

19. What is microdontia?
Osteocytes
The dental lamina
Abnormally small 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

20. What processes are involved in the bell stage?
Differentiation
The tooth germ
Odontogenesis
Differentiation - proliferation - morphogenesis

21. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Connective
Odontogenesis
The basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

22. What else undergoes proliferation in the bud stage besides the dental lamina?
Pressure on the area
The ectomesenchyme
Enamel secreting cells (ameloblasts)
The basement membrane that seperates the enamel organ and dental papilla

23. What is the main process involved in the bud stage?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Initiation
Proliferation
Proliferation - differentiation - morphogenesis

24. What are the mature cells for dentin?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Maturation
Cuboidal cells
Only dentinal tubules with processes

25. What are the clinical ramifications of gemination?

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26. What is tubercle?
Extra cusp due to effects on enamel organ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental follicle
The outer enamel epithelium

27. What kind of cells reside in the stratum intermediate?
Extra cusp due to effects on enamel organ
Compressed layer of flat to cuboidal cells
Tooth germ
Bud stage

28. Active eruption
The cervical loop
The actual vertical movement of the tooth
Morphogenesis
Dental papilla

29. What stage does supernumerary teeth occur?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Initiation
Ameloblasts
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

30. What is the embryological background for enamel?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel organ
The enamel organ - dental papilla - dental sac
Dentin secreting cells (odontoblats)

31. What hard tissue is innervated by nerves?
Development of one or more extra teeth
Odontoblasts
Dentin and alveolar bone
Enamel organ invaginates into the dental papilla

32. What are the mature cells for alveolar bone?
11th to 12th weeks
Enamel organ invaginates into the dental papilla
Differentiation - proliferation - morphogenesis
Osteocytes

33. What are the formative cells for cementum?
Local or systemic or hereditary
The ectomesenchyme
Cementoblasts
6th to 7th weeks

34. What type of tissue is enamel?
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
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Epithelial
The enamel - dentin - and cementum are secreted in successive layers

35. The stellate reticulum is located inner or outer?
Preameloblasts
The enamel organ is compressed
Outer
A mineralized cylinder - the dentinal tubule

36. What are the formative cells for enamel?
Outer
Osteoblasts
Differentiation
Ameloblasts

37. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The ectoderm
Dental papilla
The basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

38. What is the predominate process in the bell stage?
The enamel organ - dental papilla - dental sac
Common on permanent molars or cingulum of anterior teeth
Differentiation
Local or systemic or hereditary

39. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Enamel
The enamel organ

40. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Compressed layer of flat to cuboidal cells
Epithelial rests of Malassez
Common on permanent molars or cingulum of anterior teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

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

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42. The stratum intermediate is located inner or outer?
Dens in dente - gemination - tubercle - and fusion
Inner
The ameloblasts
The dental sac

43. The preameloblasts induce dental papilla cells to differentiate into what?
Odontoblastic process
Proliferation - differentiation - morphogenesis
The ectomesenchyme
Into odontoblasts

44. What are 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.
Dentin and alveolar bone
Development of one or more extra teeth
Extra cusp due to effects on enamel organ

45. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Cementocytes
Dental papilla
Oral epithelium
The enamel organ is compressed

46. What do the odontoblasts do?
The actual vertical movement of the tooth
Faulty development of enamel from interference involving ameloblasts
Inner
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

47. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Cementocytes
Maturation

48. 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
Preameloblasts
Dental tissues fully mineralize to their mature levels.
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.

49. What is the cementum matrix called?
Dentin secreting cells (odontoblats)
Imbrication lines of von Ebner
Cementoid
Outer

50. What are succedaneous teeth?
The stellate reticulum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation
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.

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Dentistry Tooth Development And Eruption

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