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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 happens to the thickened non tooth producing portions of the dental lamina eventually?
The primordium of the pulp
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
It disintegrates as the developing oral mucosa comes to line the oral cavity
Trauma - pressure or metabolic disease

2. What happens when the reduced enamel epithelium is created?
As a result of the apposition of cementum over dentin
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
Cementoblasts
Induction

3. What are the formative cells for enamel?
The ectomesenchyme
The basement membrane that seperates the enamel organ and dental papilla
Ameloblasts
Cementocytes

4. The stellate reticulum is located inner or outer?
As a result of the apposition of cementum over dentin
Dental papilla
Outer
Dental tissues secreted as matrix in successive layers.

5. What are the etiological factors for supernumerary teeth?
Common on permanent molars or cingulum of anterior teeth
Hereditary
Sphere of enamel on root
Odontoblasts

6. What layer serves as protection for the enamel organ?
Sphere of enamel on root
The outer enamel epithelium
Development of one or more extra teeth
Cementoblasts

7. What is cementogenisis?
Apposition of the cementum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectomesenchyme
Union of 2 adjacent tooth germs

8. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Cementoblasts
Absence of single or multiple teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Odontoclasts

9. What processes are involved with the apposition stage?
Induction - proliferation
Connective
Bud 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

10. What will the inner cells of the dental lamina differentiates into?
Differentiation
The basement membrane that seperates the enamel organ and dental papilla
The primordium of the pulp
The enamel organ

11. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Future dentin and pulp tissue
Maturation
Bud stage

12. What are the etiological factors of concrescence?
Absence of single or multiple teeth
The ectomesenchyme - which was influenced by the neural crest cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Traumatic injury or crowding of teeth

13. What are the formative cells for alveolar bone?
The tooth germ
Differentiation
Osteoblasts
The ectomesenchyme

14. What is the main process involved in initiation?
Differentiation - proliferation - morphogenesis
Induction
Morphogenesis
Maturation

15. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
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
Cementoblasts
9th to 10th weeks

16. When does macro/microdontia occur?
Cementocytes
8th week
The dental sac
Bud stage

17. When does dens in dente occur?
During the cap stage
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Union of root structure of two or more teeth by cementum
Proliferation - differentiation - morphogenesis

18. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Future dentin and pulp tissue
The actual vertical movement of the tooth
In the cap stage

19. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Extra cusp due to effects on enamel organ
May be confused as calculus deposit on root
Development of one or more extra teeth

20. What else undergoes proliferation in the bud stage besides the dental lamina?
6th to 7th weeks
The ectomesenchyme
Preameloblasts
Union of root structure of two or more teeth by cementum

21. What is the outer portion of the ectoderm in the initiation stage?
Osteocytes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ameloblasts place an acellular dental cuticle on the new enamel surface
Oral epithelium

22. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Traumatic injury or crowding of teeth
Initiation stage
The basement membrane that seperates the enamel organ and dental papilla

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

24. What is an enamel pearl?
Sphere of enamel on root
The permanent molars
Osteoblasts
Maturation

25. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
The bud stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dental follicle

26. Which teeth are nonsuccedaneous?
Abnormally large teeth
6th to 7th weeks
The permanent molars
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

27. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary
The ameloblasts

28. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The cervical loop
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Cementoblasts

29. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Union of root structure of two or more teeth by cementum
Dental papilla
The enamel organ - dental papilla - dental sac
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

30. What is gemination?
The permanent molars
Maturation
Cuboidal cells
Tooth germ tries to divide

31. What stage does anodontia occur?
Cementoblasts
During the cap stage
Initiation stage
Sphere of enamel on root

32. What are the mature cells for enamel?
Odontogenesis
There are none - they are lost with eruption
Into odontoblasts
The outer enamel epithelium

33. What is another name for the dental sac?
Induction
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental follicle
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

34. How many types of cells are found in the enamel organ in the bell stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The outer cells of the dental papilla and the central cells of the dental papilla
The stellate reticulum
4 types

35. What is the cementum matrix called?
Cementoid
Dental papilla
6th to 7th weeks
When the gingiva recedes and no actual tooth movement takes place

36. When does the process of root development take place?
The outer cells of the dental papilla and the central cells of the dental papilla
The permanent molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
9th to 10th weeks

37. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
8th week
Imbrication lines of von Ebner
Sphere of enamel on root

38. 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.
Enamel
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
During the cap stage

39. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The enamel organ - dental papilla - dental sac
Connective
The outer cells of the dental papilla and the central cells of the dental papilla

40. What are the mature cells for cementum?
The ameloblasts
Initiation stage
Cementocytes
Cuboidal cells

41. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ is compressed
The outer enamel epithelium

42. What are the etiological factors for anodontia?
Abnormally large teeth
Extra cusp due to effects on enamel organ
In the cap stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

43. What are the development disturbances of the apposition and maturation stages?
Abnormally small teeth
Dens in dente - gemination - tubercle - and fusion
The basement membrane
Enamel pearl - enamel dysplasia - and concresence

44. What is the process involved in the maturation stage?
Maturation
4 types
Cementoblasts
Odontogenesis

45. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Odontoblastic process
Induction
The ameloblasts place an acellular dental cuticle on the new enamel surface
Sphere of enamel on root

46. What are the etiological factors of tubercle?
The basement membrane that seperates the enamel organ and dental papilla
Tooth germ
Trauma - pressure or metabolic disease
The enamel organ

47. What are the clinical ramifications of concrescence?
May be confused as calculus deposit on root
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Common with permanent maxillary molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

48. Active eruption
The actual vertical movement of the tooth
Enamel
Hereditary
Dentin secreting cells (odontoblats)

49. What happens during the apposition stage?
Pressure on the area
Dental tissues secreted as matrix in successive layers.
There is unequal growth in different parts of the tooth bud
Dens in dente - gemination - tubercle - and fusion

50. What is the structure responsible for root development?
Apposition of the cementum
Differentiation - proliferation - morphogenesis
6th to 7th weeks
The cervical loop