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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 during the maturation stage?
Differentiation
May be confused as calculus deposit on root
Tall columnar cells
Dental tissues fully mineralize to their mature levels.

2. What will the dental papilla eventually form?
Future dentin and pulp tissue
Imbrication lines of von Ebner
Common with permanent maxillary molars
Compressed layer of flat to cuboidal cells

3. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Tooth germ tries to divide

4. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementoblasts
Cementoblasts

5. Which teeth are nonsuccedaneous?
Initiation stage
Initiation
The permanent molars
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

6. What is the time span for the bell stage?
Displacement of ameloblasts to root surface
Cementoblasts
Hereditary
11th to 12th weeks

7. What kind of cells occur in the outer enamel epithelium in the bell stage?
Traumatic injury or crowding of teeth
Epithelial
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.
Cuboidal cells

8. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars
There is unequal growth in different parts of the tooth bud
Abnormally small teeth

9. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The actual vertical movement of the tooth
May be confused as calculus deposit on root
Tooth germ
Odontoblastic process

10. Do odontoblasts start their secretion of matrix before the ameloblasts?
Faulty development of enamel from interference involving ameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The outer cells of the dental papilla and the central cells of the dental papilla
Outer

11. What is the function of the Hertwig's epithelial root sheath?
Sphere of enamel on root
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Pressure on the area
The actual vertical movement of the tooth

12. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Only dentinal tubules with processes
Common on permanent molars or cingulum of anterior teeth

13. What type of tissue is dentin - cementum - and alveolar bone?
Common with permanent maxillary molars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Connective
Odontoblasts

14. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The primordium of the pulp
Tooth germ
Osteoblasts
Connective

15. What hard tissue is can not have tissue formation after eruption?
Ameloblasts
Enamel
During the cap stage
Tooth germ tries to divide

16. What is the outer portion of the ectoderm in the initiation stage?
Common on permanent molars or cingulum of anterior teeth
Proliferation - differentiation - morphogenesis
Oral epithelium
In the cap stage

17. What are the formative cells for cementum?
Tooth germ tries to divide
Cementoblasts
The basement membrane
Initiation stage

18. Active eruption
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The actual vertical movement of the tooth
Local or systemic or hereditary
Sphere of enamel on root

19. What is the main process involved in initiation?
Extra cusp due to effects on enamel organ
Induction
The basement membrane that seperates the enamel organ and dental papilla
Preameloblasts

20. What is the time span for initiation?
A bilayer rim that consists only IEE and OEE
6th to 7th weeks
Cementocytes
Compressed layer of flat to cuboidal cells

21. Passive eruption
Dentin secreting cells (odontoblats)
When the gingiva recedes and no actual tooth movement takes place
Induction
The ectomesenchyme

22. What are the clinical ramifications of fusion?
Compressed layer of flat to cuboidal cells
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Differentiation
Commonly involves permanent maxillary lateral incisor and 3rd molars

23. What will the outer cells of the dental lamina differentiate into?
Initiation
The basement membrane
Dentin secreting cells (odontoblats)
Trauma - pressure or metabolic disease

24. What happens when the reduced enamel epithelium is created?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
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

25. What are the formative cells for alveolar bone?
A bilayer rim that consists only IEE and OEE
The bud stage
Union of root structure of two or more teeth by cementum
Osteoblasts

26. What are the clinical ramifications of enamel dysplasia?
As a result of the apposition of cementum over dentin
Absence of single or multiple teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoblasts

27. What happens during initiation?
Common with permanent maxillary molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoclasts
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

28. What is another name for the dental sac?
Enamel organ invaginates into the dental papilla
Dental follicle
Preameloblasts
Enamel organ

29. What happens during the appositional stage?
Dentin and alveolar bone
Dental tissues fully mineralize to their mature levels.
The basement membrane that seperates the enamel organ and dental papilla
The enamel - dentin - and cementum are secreted in successive layers

30. What happens during the apposition stage?
Dens in dente - gemination - tubercle - and fusion
Proliferation
Dental tissues secreted as matrix in successive layers.
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

31. What is the embryological background for enamel?
Hereditary
Enamel organ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The cervical loop

32. What processes are involved in the bell 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
Osteocytes
Cementoblasts
Differentiation - proliferation - morphogenesis

33. What is enamel dysplasia?
Inner
The cervical loop
Faulty development of enamel from interference involving ameloblasts
Dental papilla

34. How is the reduced enamel epithelium created?
Morphogenesis
Absence of single or multiple teeth
The enamel organ is compressed
Sphere of enamel on root

35. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Odontoclasts
Dentin secreting cells (odontoblats)
Osteoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

36. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Compressed layer of flat to cuboidal cells
Differentiation
The basement membrane

37. What are the etiological factors for supernumerary teeth?
Induction
Hereditary
Dental tissues fully mineralize to their mature levels.
Union of 2 adjacent tooth germs

38. The stellate reticulum is located inner or outer?
Dens in dente - gemination - tubercle - and fusion
The outer enamel epithelium
Outer
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.

39. What type of tissue is enamel?
Enamel
Epithelial
Future dentin and pulp tissue
The ameloblasts

40. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Common on permanent molars or cingulum of anterior teeth
Cuboidal cells
The cervical loop

41. What kind of cells reside in the stratum intermediate?
Tall columnar cells
Future dentin and pulp tissue
Compressed layer of flat to cuboidal cells
Odontoblasts

42. What is macrodontia?
Cementocytes
Abnormally large teeth
Maturation
Commonly involves permanent maxillary lateral incisor and 3rd molars

43. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The enamel organ - dental papilla - 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
Arrest and reversal lines
The ameloblasts place an acellular dental cuticle on the new enamel surface

44. What happens during the cap stage?
Sphere of enamel on root
Local or systemic or hereditary
Tall columnar cells
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.

45. What stage does the dental tissues subsequently fully mineralize
Abnormally small teeth
Union of 2 adjacent tooth germs
Maturation
There are none - they are lost with eruption

46. What are the etiological factors for dens in dente and gemination?
Alveolar bone
Hereditary
Imbrication lines of von Ebner
Morphogenesis

47. What is the cap in the cap stage?
Only dentinal tubules with processes
May be confused as calculus deposit on root
The enamel organ
The bud stage

48. What are the odontoblastic processes is contained in what?
Extra cusp due to effects on enamel organ
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
A mineralized cylinder - the dentinal tubule
The stellate reticulum

49. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Morphogenesis
Odontoblastic process

50. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The enamel organ - dental papilla - dental sac
The ectomesenchyme - which was influenced by the neural crest cells
Induction - proliferation
The basement membrane