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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 is the time span for the cap stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementoblasts
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
9th to 10th weeks

2. Where is the enamal organ originally derived from?
A bilayer rim that consists only IEE and OEE
The basement membrane
The ectoderm
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

3. What is the predominate process in the bell stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Apposition of the cementum
6th to 7th weeks
Differentiation

4. What is the function of the Hertwig's epithelial root sheath?
Dental follicle
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
6th to 7th weeks

5. How is the reduced enamel epithelium created?
Absence of single or multiple teeth
The enamel organ is compressed
Odontoblastic process
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

6. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
A mineralized cylinder - the dentinal tubule
Enamel pearl - enamel dysplasia - and concresence
Proliferation

7. Tooth development
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Odontogenesis
11th to 12th weeks
Odontoclasts

8. What are the etiological factors for anodontia?
Differentiation - proliferation - morphogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The tooth germ
The ameloblasts place an acellular dental cuticle on the new enamel surface

9. 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
Absence of single or multiple teeth
Inner
Faulty development of enamel from interference involving ameloblasts

10. What is the predominate process of the cap stage?
Abnormally large teeth
Morphogenesis
The outer cells of the dental papilla and the central cells of the dental papilla
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

11. What is tubercle?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane
Connective
Extra cusp due to effects on enamel organ

12. What is the embryological background for enamel?
Compressed layer of flat to cuboidal cells
Enamel organ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Enamel pearl - enamel dysplasia - and concresence

13. What hard tissue has vascularity?
Traumatic injury or crowding of teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Alveolar bone
Extra cusp due to effects on enamel organ

14. What is cementogenisis?
Enamel organ
Dens in dente - gemination - tubercle - and fusion
Cementocytes
Apposition of the cementum

15. What are the etiological factors for dens in dente and gemination?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Hereditary
Hereditary in localized form. endocrine dysfunction is complete
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

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

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17. Passive eruption
Enamel pearl - enamel dysplasia - and concresence
Extra cusp due to effects on enamel organ
The basement membrane
When the gingiva recedes and no actual tooth movement takes place

18. What happens when the reduced enamel epithelium is created?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Maturation
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 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

19. What are the clinical ramifications of fusion?
Abnormally large teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The outer enamel epithelium
Enamel pearl - enamel dysplasia - and concresence

20. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The permanent molars
Union of 2 adjacent tooth germs
Outer

21. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Epithelial
The basement membrane
The ectomesenchyme
Traumatic injury or crowding of teeth

22. What happens during the bell stage?
Cementocytes
Development of one or more extra teeth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Compressed layer of flat to cuboidal cells

23. What is dens in dente?
Odontoclasts
Enamel organ invaginates into the dental papilla
Dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

24. What are the mature cells for cementum?
Tall columnar cells
The enamel organ is compressed
Cementocytes
Cuboidal cells

25. What is the cap in the cap stage?
The enamel organ
Extra cusp due to effects on enamel organ
Odontoclasts
Enamel secreting cells (ameloblasts)

26. What are the clinical ramifications of gemination?

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27. Where is the dental papilla originally derived from?
Hereditary in localized form. endocrine dysfunction is complete
Enamel organ invaginates into the dental papilla
The ectomesenchyme - which was influenced by the neural crest cells
Hereditary

28. What kind of cells occur in the inner enamel epithelium?
Dentin and alveolar bone
Tooth germ
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
Tall columnar cells

29. Which teeth are nonsuccedaneous?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The permanent molars
Inner
Lines of Retzuis

30. What are the formative cells for alveolar bone?
Osteoblasts
6th to 7th weeks
Induction
Displacement of ameloblasts to root surface

31. What is concrescence?
Union of 2 adjacent tooth germs
Arrest and reversal lines
Union of root structure of two or more teeth by cementum
The ectomesenchyme

32. What is gemination?
Hereditary
Bud stage
Tooth germ tries to divide
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

33. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Compressed layer of flat to cuboidal cells
Enamel secreting cells (ameloblasts)
Epithelial
Epithelial rests of Malassez

34. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The basement membrane
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
9th to 10th weeks

35. What is fusion?
The dental lamina
Union of 2 adjacent tooth germs
Differentiation - proliferation - morphogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

36. What are the cell layers found in the enamel organ in the bell stage?
Initiation
6th to 7th weeks
Oral epithelium
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

37. What are the etiological factors of enamel dysplasia?
Epithelial
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
Imbrication lines of von Ebner
Local or systemic or hereditary

38. What is the main process involved in the bud stage?
Epithelial
Proliferation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Osteoblasts

39. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Traumatic injury or crowding of teeth
Odontogenesis

40. What is matrix?
Hereditary in localized form. endocrine dysfunction is complete
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Tooth germ tries to divide
The basement membrane

41. What does the cervical loop consist of?
The actual vertical movement of the tooth
A bilayer rim that consists only IEE and OEE
11th to 12th weeks
The dental sac

42. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Hereditary
Only dentinal tubules with processes
The ameloblasts

43. What will the outer cells of the dental lamina differentiate into?
The primordium of the pulp
Dentin secreting cells (odontoblats)
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

44. What are the clinical ramifications of anodontia?
Dens in dente - gemination - tubercle - and fusion
Traumatic injury or crowding of teeth
There is unequal growth in different parts of the tooth bud
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

45. What are the processes involved in the cap stage?
Osteoblasts
Cementoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Proliferation - differentiation - morphogenesis

46. What are the formative cells for dentin?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Odontoblasts

47. The stratum intermediate is located inner or outer?
Enamel pearl - enamel dysplasia - and concresence
Alveolar bone
Dental papilla
Inner

48. What are the clinical ramifications of enamel dysplasia?
The cementum - PDL - and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Enamel

49. The oral epithelium is induced by the ectomesenchyme to produce what?
Induction - proliferation
Tooth germ tries to divide
Union of 2 adjacent tooth germs
The dental lamina

50. What are the mature cells for alveolar bone?
Inner
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Induction - proliferation
Osteocytes