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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 is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
The ectomesenchyme - which was influenced by the neural crest cells
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
9th to 10th weeks

2. What are the formative cells for enamel?
The stellate reticulum
Ameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Differentiation - proliferation - morphogenesis

3. Where is the dental sac originally derived from?
Cementocytes
The ectomesenchyme
Development of one or more extra teeth
Cementoblasts

4. What happens during initiation?
Cementocytes
During the cap stage
Cuboidal cells
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

5. What are the formative cells for dentin?
Cementocytes
The enamel organ is compressed
Odontoblasts
Union of root structure of two or more teeth by cementum

6. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Tooth germ
Union of root structure of two or more teeth by cementum
Local or systemic or hereditary

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

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8. What type of tissue is enamel?
Dental tissues secreted as matrix in successive layers.
The basement membrane
The dental sac
Epithelial

9. What are the etiological factors for fusion?
Pressure on the area
Cuboidal cells
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
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

10. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
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
Ameloblasts
Osteoblasts

11. What are the formative cells for cementum?
Oral epithelium
Cementoblasts
Osteocytes
Dentin and alveolar bone

12. Active eruption
6th to 7th weeks
The actual vertical movement of the tooth
Common on permanent molars or cingulum of anterior teeth
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

13. What are the clinical ramifications of gemination?

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14. What is an enamel pearl?
The stellate reticulum
The ectomesenchyme
Sphere of enamel on root
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

15. What is macrodontia?
Abnormally large teeth
Absence of single or multiple teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The permanent molars

16. The stratum intermediate is located inner or outer?
Tall columnar cells
Only dentinal tubules with processes
Inner
Dentin and alveolar bone

17. How is the dentinocemental junction formed?
The cementum - PDL - and alveolar bone
Enamel organ
As a result of the apposition of cementum over dentin
The actual vertical movement of the tooth

18. What are the clinical ramifications of enamel pearl?
Faulty development of enamel from interference involving ameloblasts
May be confused as calculus deposit on root
The tooth germ
Development of one or more extra teeth

19. What are the mature cells for alveolar bone?
Odontogenesis
Osteocytes
Odontoclasts
Induction - proliferation

20. What is dens in dente?
Enamel organ invaginates into the dental papilla
The permanent molars
During the cap stage
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

21. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Development of one or more extra teeth
The cervical loop
Absence of single or multiple teeth

22. What happens during the bell stage?
The bud stage
The basement membrane
The outer enamel epithelium
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

23. What is the main process involved in the bud stage?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Maturation
9th to 10th weeks
Proliferation

24. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Outer
Common with permanent maxillary molars
The basement membrane
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.

25. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Extra cusp due to effects on enamel organ
The enamel organ - dental papilla - dental sac
It disintegrates as the developing oral mucosa comes to line the oral cavity
The ameloblasts

26. What is the cap in the cap stage?
Development of one or more extra teeth
The enamel organ
Cementoid
The ectomesenchyme

27. Which teeth are nonsuccedaneous?
Maturation
Odontogenesis
Enamel organ
The permanent molars

28. What are supernumerary teeth?
Maturation
Tall columnar cells
Faulty development of enamel from interference involving ameloblasts
Development of one or more extra teeth

29. What is the time span for the bell stage?
8th week
11th to 12th weeks
9th to 10th weeks
Union of 2 adjacent tooth germs

30. What is the predominate process of the cap stage?
Dental follicle
Morphogenesis
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 dental sac

31. What happens during the cap stage?
When the gingiva recedes and no actual tooth movement takes place
Union of root structure of two or more teeth by cementum
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.
Connective

32. What is the embryological background for enamel?
Enamel organ
Induction
The basement membrane
Dental tissues secreted as matrix in successive layers.

33. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Odontoblastic process
Induction

34. What are the clinical ramifications of anodontia?
Abnormally large teeth
Initiation stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Maturation

35. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
4 types
Cementocytes
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

36. When does macro/microdontia occur?
Differentiation - proliferation - morphogenesis
Pressure on the area
Bud stage
Dentin secreting cells (odontoblats)

37. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The actual vertical movement of the tooth
The enamel organ - dental papilla - dental sac
Odontoblastic process
Cuboidal cells

38. What does the cervical loop consist of?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
A bilayer rim that consists only IEE and OEE
The ectomesenchyme
Sphere of enamel on root

39. What are the processes involved in the cap stage?
Enamel organ invaginates into the dental papilla
Proliferation - differentiation - morphogenesis
May be confused as calculus deposit on root
Tooth germ

40. What is the time span for initiation?
6th to 7th weeks
The ectoderm
9th to 10th weeks
Abnormally large teeth

41. Which layer in the bell stage has star shaped cells?
The stellate reticulum
The permanent molars
The outer enamel epithelium
Dental follicle

42. The stellate reticulum is located inner or outer?
The enamel organ is compressed
Lines of Retzuis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Outer

43. What stage does anodontia occur?
The dental sac
Cementocytes
Initiation stage
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

44. What is the time span for the bud stage?
8th week
Cuboidal cells
A bilayer rim that consists only IEE and OEE
Dental papilla

45. What are the incremental lines for cementum and alveolar bone?
Cementocytes
Development of one or more extra teeth
Arrest and reversal lines
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

46. What is the process involved in the maturation stage?
The outer cells of the dental papilla and the central cells of the dental papilla
Maturation
Enamel organ invaginates into the dental papilla
Absence of single or multiple teeth

47. What happens during the maturation stage?
The primordium of the pulp
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
Odontoclasts
Dental tissues fully mineralize to their mature levels.

48. What is the structure responsible for root development?
Odontoblastic process
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The cervical loop

49. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Trauma - pressure or metabolic disease
9th to 10th weeks
Osteoblasts
The bud stage

50. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Future dentin and pulp tissue
Hereditary
When the gingiva recedes and no actual tooth movement takes place