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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 an enamel pearl?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Proliferation - differentiation - morphogenesis
Sphere of enamel on root
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

2. What are the formative cells for enamel?
Trauma - pressure or metabolic disease
Differentiation
Ameloblasts
The dental sac

3. What kind of cells occur in the inner enamel epithelium?
Oral epithelium
Tall columnar cells
The primordium of the pulp
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

4. What is the cementum matrix called?
Hereditary
Initiation
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
Cementoid

5. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontogenesis
6th to 7th weeks

6. What are the clinical ramifications of enamel pearl?
There are none - they are lost with eruption
Hereditary
May be confused as calculus deposit on root
The enamel - dentin - and cementum are secreted in successive layers

7. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Future dentin and pulp tissue
As a result of the apposition of cementum over dentin
Cementocytes

8. What processes are involved with the apposition stage?
When the gingiva recedes and no actual tooth movement takes place
Morphogenesis
Enamel
Induction - proliferation

9. What are the etiological factors for anodontia?
Absence of single or multiple teeth
The actual vertical movement of the tooth
Epithelial rests of Malassez
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

10. What is the site for the future dentioenamel junction?
The enamel organ
The basement membrane that seperates the enamel organ and dental papilla
Ameloblasts
Bud stage

11. What is the function of the Hertwig's epithelial root sheath?
Abnormally large teeth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Odontoclasts
4 types

12. What does the cervical loop consist of?
Preameloblasts
The bud stage
The outer enamel epithelium
A bilayer rim that consists only IEE and OEE

13. What is the time span for the cap stage?
There are none - they are lost with eruption
Odontoclasts
8th week
9th to 10th weeks

14. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Compressed layer of flat to cuboidal cells
The basement membrane
Induction
The ameloblasts

15. What happens during the appositional stage?
Hereditary in localized form. endocrine dysfunction is complete
The enamel - dentin - and cementum are secreted in successive layers
There are none - they are lost with eruption
The ectomesenchyme - which was influenced by the neural crest cells

16. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Connective
The bud stage

17. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Alveolar bone
The enamel organ
Tall columnar cells
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

18. What is fusion?
Union of 2 adjacent tooth germs
Development of one or more extra teeth
Odontoclasts
Oral epithelium

19. What is the outer portion of the ectoderm in the initiation stage?
The basement membrane that seperates the enamel organ and dental papilla
There is unequal growth in different parts of the tooth bud
The cementum - PDL - and alveolar bone
Oral epithelium

20. What type of tissue is enamel?
There is unequal growth in different parts of the tooth bud
Epithelial
Osteoblasts
During the cap stage

21. What are the clinical ramifications of anodontia?
Epithelial
Alveolar bone
The basement membrane that seperates the enamel organ and dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

22. What happens when the reduced enamel epithelium is created?
Enamel organ invaginates into the dental papilla
Odontogenesis
The stellate reticulum
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

23. What wll the inner enamel epithelium differentiate into?
Faulty development of enamel from interference involving ameloblasts
Osteoblasts
Extra cusp due to effects on enamel organ
Enamel secreting cells (ameloblasts)

24. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Enamel
Hereditary
May be confused as calculus deposit on root

25. When does dens in dente occur?
Hereditary
During the cap stage
Dental tissues fully mineralize to their mature levels.
Morphogenesis

26. What are the etiological factors of tubercle?
Extra cusp due to effects on enamel organ
Induction
Cementoid
Trauma - pressure or metabolic disease

27. What is another name for the dental sac?
Union of root structure of two or more teeth by cementum
Cementoid
Dental follicle
Maturation

28. What is the time span for initiation?
Dentin and alveolar bone
6th to 7th weeks
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
Tall columnar cells

29. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Hereditary
Proliferation - differentiation - morphogenesis
Tooth germ
Displacement of ameloblasts to root surface

30. What are the mature cells for cementum?
Maturation
The cementum - PDL - and alveolar bone
The ectomesenchyme - which was influenced by the neural crest cells
Cementocytes

31. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Outer
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental tissues secreted as matrix in successive layers.
Local or systemic or hereditary

32. In the cap stage the tooth bud does not grow - what happens?
The basement membrane
The enamel organ is compressed
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
There is unequal growth in different parts of the tooth bud

33. The oral epithelium is induced by the ectomesenchyme to produce what?
Imbrication lines of von Ebner
Differentiation - proliferation - morphogenesis
Induction
The dental lamina

34. What will the inner cells of the dental lamina differentiates into?
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
Preameloblasts
In the cap stage

35. What is concrescence?
Cementoblasts
Union of root structure of two or more teeth by cementum
The enamel organ - dental papilla - dental sac
The basement membrane

36. When does macro/microdontia occur?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Hereditary
Bud stage
Common on permanent molars or cingulum of anterior teeth

37. What are the cell layers found in the enamel organ in the bell stage?
Cementoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The dental lamina
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. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
There is unequal growth in different parts of the tooth bud

39. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Connective
Imbrication lines of von Ebner
Local or systemic or hereditary

40. What are supernumerary teeth?
Dens in dente - gemination - tubercle - and fusion
Development of one or more extra teeth
11th to 12th weeks
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

41. What is the embryological background for enamel?
Dentin and alveolar bone
Common with permanent maxillary molars
Enamel organ
Abnormally small teeth

42. What is the primordium of the tooth?
The bud stage
The tooth germ
Trauma - pressure or metabolic disease
Induction - proliferation

43. What are entrapped cementoblasts called?
Epithelial
Cementocytes
Maturation
Common with permanent maxillary molars

44. What are the formative cells for dentin?
Proliferation - differentiation - morphogenesis
Connective
Odontoblasts
Odontogenesis

45. The stratum intermediate is located inner or outer?
Alveolar bone
Inner
Proliferation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

46. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dentin and alveolar bone
Odontoblastic process
Into odontoblasts
Development of one or more extra teeth

47. How is the reduced enamel epithelium created?
The enamel organ is compressed
Hereditary
Odontoblasts
When the gingiva recedes and no actual tooth movement takes place

48. What is anodontia?
The tooth germ
Absence of single or multiple teeth
Sphere of enamel on root
The enamel - dentin - and cementum are secreted in successive layers

49. 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
Dens in dente - gemination - tubercle - and fusion
There are none - they are lost with eruption
The dental sac

50. What is enamel dysplasia?
There is unequal growth in different parts of the tooth bud
The primordium of the pulp
Faulty development of enamel from interference involving ameloblasts
Bud stage