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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What are the formative cells for dentin?
Odontoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
May be confused as calculus deposit on root
Outer

2. What are the mature cells for enamel?
Proliferation
Development of one or more extra teeth
Absence of single or multiple teeth
There are none - they are lost with eruption

3. What happens during the maturation stage?
The ectomesenchyme - which was influenced by the neural crest cells
Sphere of enamel on root
Dental tissues fully mineralize to their mature levels.
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

4. What is the time span for the bud stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
11th to 12th weeks
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
8th week

5. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
There are none - they are lost with eruption
Epithelial rests of Malassez
Tall columnar cells
Dentin secreting cells (odontoblats)

6. What are the formative cells for enamel?
Dentin secreting cells (odontoblats)
Ameloblasts
The cervical loop
There is unequal growth in different parts of the tooth bud

7. What is dens in dente?
Tooth germ
Into odontoblasts
The tooth germ
Enamel organ invaginates into the dental papilla

8. What is tubercle?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The tooth germ
Extra cusp due to effects on enamel organ
Ameloblasts

9. What is fusion?
Development of one or more extra teeth
Union of 2 adjacent tooth germs
The enamel organ
Differentiation

10. What happens during the appositional stage?
As a result of the apposition of cementum over dentin
The ectomesenchyme
The enamel - dentin - and cementum are secreted in successive layers
When the gingiva recedes and no actual tooth movement takes place

11. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Odontogenesis
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 tooth germ

12. What are the clinical ramifications of enamel dysplasia?
The basement membrane
The permanent molars
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The enamel organ

13. Where is the enamal organ originally derived from?
Dental tissues fully mineralize to their mature levels.
The ectoderm
Enamel secreting cells (ameloblasts)
The enamel - dentin - and cementum are secreted in successive layers

14. What kind of cells reside in the stratum intermediate?
Odontogenesis
Compressed layer of flat to cuboidal cells
The ectoderm
The basement membrane that seperates the enamel organ and dental papilla

15. What is the cementum matrix called?
The actual vertical movement of the tooth
Outer
Cementoid
Bud stage

16. How many types of cells are found in the enamel organ in the bell stage?
Induction
4 types
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ameloblasts

17. What hard tissue has vascularity?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Alveolar bone
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
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

18. What is the main process involved in the bud stage?
Outer
Proliferation
The basement membrane
May be confused as calculus deposit on root

19. What hard tissue is innervated by nerves?
8th week
Dentin and alveolar bone
Lines of Retzuis
The cervical loop

20. How is the reduced enamel epithelium created?
Enamel secreting cells (ameloblasts)
The enamel organ is compressed
Common on permanent molars or cingulum of anterior teeth
Proliferation - differentiation - morphogenesis

21. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontogenesis
Proliferation
Into odontoblasts

22. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Bud stage
Osteoblasts
As a result of the apposition of cementum over dentin

23. What layer serves as protection for the enamel organ?
A bilayer rim that consists only IEE and OEE
Only dentinal tubules with processes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The outer enamel epithelium

24. What happens during initiation?
The ectomesenchyme
Cementocytes
Connective
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

25. What are the incremental lines for enamel?
Enamel organ
Common on permanent molars or cingulum of anterior teeth
Lines of Retzuis
Epithelial

26. 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.
Absence of single or multiple teeth
Dentin secreting cells (odontoblats)
The enamel organ

27. What are the processes involved in the cap stage?
Common on permanent molars or cingulum of anterior teeth
The outer enamel epithelium
Pressure on the area
Proliferation - differentiation - morphogenesis

28. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
The stellate reticulum
Imbrication lines of von Ebner
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

29. What are the etiological factors of concrescence?
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
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Traumatic injury or crowding of teeth

30. The stellate reticulum is located inner or outer?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The cementum - PDL - and alveolar bone
Abnormally small teeth
Outer

31. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Induction - proliferation
Maturation

32. What is another name for the dental sac?
Dental follicle
During the cap stage
Cementoid
Enamel

33. What are entrapped cementoblasts called?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementocytes
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
Dentin secreting cells (odontoblats)

34. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Hereditary in localized form. endocrine dysfunction is complete
The primordium of the pulp
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

35. What is anodontia?
Absence of single or multiple teeth
A bilayer rim that consists only IEE and OEE
Tooth germ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

36. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Hereditary
There are none - they are lost with eruption
Hereditary in localized form. endocrine dysfunction is complete

37. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Local or systemic or hereditary
Abnormally large 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.

38. What are the etiological factors for anodontia?
Proliferation
Bud stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Traumatic injury or crowding of teeth

39. What is the time span for the cap stage?
9th to 10th weeks
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
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

40. What is an enamel pearl?
Apposition of the cementum
Sphere of enamel on root
Initiation stage
Dens in dente - gemination - tubercle - and fusion

41. Passive eruption
Cementoid
Cementoblasts
Bud stage
When the gingiva recedes and no actual tooth movement takes place

42. What stage does supernumerary teeth occur?
Connective
Induction
The stellate reticulum
Initiation

43. When does dens in dente occur?
Tall columnar cells
During the cap stage
The ectomesenchyme
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

44. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane

45. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Dental papilla
Union of 2 adjacent tooth germs
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

46. What are the etiological factors for dens in dente and gemination?
Enamel
Hereditary
Imbrication lines of von Ebner
The enamel organ is compressed

47. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Proliferation - differentiation - morphogenesis
Odontoblastic process

48. What stage does anodontia occur?
Abnormally small teeth
Initiation stage
Dens in dente - gemination - tubercle - and fusion
Dentin secreting cells (odontoblats)

49. What are the odontoblastic processes is contained in what?
Initiation stage
A bilayer rim that consists only IEE and OEE
A mineralized cylinder - the dentinal tubule
Enamel secreting cells (ameloblasts)

50. Where does the primordium of the permanent dentition develop?
Hereditary
Development of one or more extra teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs