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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. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The ameloblasts
Common with permanent maxillary molars
Traumatic injury or crowding of teeth
Tooth germ

2. The stratum intermediate is located inner or outer?
Initiation
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Inner
Displacement of ameloblasts to root surface

3. What is the time span for the cap stage?
Cementocytes
It disintegrates as the developing oral mucosa comes to line the oral cavity
9th to 10th weeks
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

4. What happens during the apposition 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
Dental tissues secreted as matrix in successive layers.
Ameloblasts
Dental papilla

5. What is fusion?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
It disintegrates as the developing oral mucosa comes to line the oral cavity
Induction - proliferation
Union of 2 adjacent tooth germs

6. What is the process involved in the maturation stage?
The basement membrane
The enamel - dentin - and cementum are secreted in successive layers
Maturation
Compressed layer of flat to cuboidal cells

7. What happens during the bud stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel organ invaginates into the dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

8. What are the mature cells for alveolar bone?
Osteocytes
Differentiation
There are none - they are lost with eruption
Epithelial

9. What happens during initiation?
Epithelial
11th to 12th weeks
Epithelial rests of Malassez
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

10. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Cuboidal cells
The tooth germ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

11. What does the cervical loop consist of?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Ameloblasts
A bilayer rim that consists only IEE and OEE
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

12. What processes are involved with the apposition stage?
Alveolar bone
The basement membrane that seperates the enamel organ and dental papilla
Preameloblasts
Induction - proliferation

13. What is another name for the dental sac?
Dental follicle
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Osteocytes
The cementum - PDL - and alveolar bone

14. The preameloblasts induce dental papilla cells to differentiate into what?
A bilayer rim that consists only IEE and OEE
Local or systemic or hereditary
Cementoid
Into odontoblasts

15. 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
Compressed layer of flat to cuboidal cells
Development of one or more extra teeth
4 types

16. What is the primordium of the tooth?
The ectomesenchyme - which was influenced by the neural crest cells
The tooth germ
Odontoblastic process
Hereditary

17. What are the etiological factors for anodontia?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Connective
Extra cusp due to effects on enamel organ

18. What are the incremental lines for dentin?
Abnormally large teeth
The ectoderm
Imbrication lines of von Ebner
May be confused as calculus deposit on root

19. What is the embryological background for enamel?
Enamel organ
Odontoclasts
The tooth germ
Enamel organ invaginates into the dental papilla

20. What are the formative cells for dentin?
Odontoblasts
Tooth germ
Outer
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. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Hereditary
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
There are none - they are lost with eruption
Inner

22. What stage does anodontia occur?
Epithelial
Odontoblastic process
Enamel secreting cells (ameloblasts)
Initiation stage

23. What are the mature cells for cementum?
Proliferation - differentiation - morphogenesis
Cementocytes
During the cap stage
The dental sac

24. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Dental papilla
As a result of the apposition of cementum over dentin
Union of 2 adjacent tooth germs

25. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The dental lamina
Union of 2 adjacent tooth germs
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The ameloblasts place an acellular dental cuticle on the new enamel surface

26. What is the embryological background for dentin - cementum and alveolar bone?
The basement membrane
Proliferation - differentiation - morphogenesis
Dental papilla
Imbrication lines of von Ebner

27. What are the etiological factors for supernumerary teeth?
Extra cusp due to effects on enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Hereditary

28. What will the outer cells of the dental lamina differentiate into?
Initiation stage
Trauma - pressure or metabolic disease
The cervical loop
Dentin secreting cells (odontoblats)

29. What are the incremental lines for enamel?
Tall columnar cells
Lines of Retzuis
Pressure on the area
Dental papilla

30. What are the clinical ramifications of enamel dysplasia?
The ectomesenchyme - which was influenced by the neural crest cells
11th to 12th weeks
There is unequal growth in different parts of the tooth bud
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

31. What are the etiological factors for dens in dente and gemination?
The ameloblasts place an acellular dental cuticle on the new enamel surface
A bilayer rim that consists only IEE and OEE
Hereditary
The tooth germ

32. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Faulty development of enamel from interference involving ameloblasts
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
The enamel - dentin - and cementum are secreted in successive layers
Cementoblasts

33. Which layer in the bell stage has star shaped cells?
Lines of Retzuis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoblastic process
The stellate reticulum

34. What are the mature cells for dentin?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Outer
Only dentinal tubules with processes
A bilayer rim that consists only IEE and OEE

35. In the cap stage the tooth bud does not grow - what happens?
A mineralized cylinder - the dentinal tubule
Initiation
There is unequal growth in different parts of the tooth bud
The enamel organ is compressed

36. What hard tissue is can not have tissue formation after eruption?
Enamel
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
Common with permanent maxillary molars
Union of root structure of two or more teeth by cementum

37. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Cementocytes
The ectomesenchyme

38. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Apposition of the cementum
Cementocytes
The bud stage
The cementum - PDL - and alveolar bone

39. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
9th to 10th weeks
Cementoblasts
Initiation stage

40. What is anodontia?
Dental tissues secreted as matrix in successive layers.
The cervical loop
Absence of single or multiple teeth
During the cap stage

41. 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
Proliferation
Enamel pearl - enamel dysplasia - and concresence
Tooth germ

42. What is the time span for the bud stage?
8th week
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary in localized form. endocrine dysfunction is complete
Epithelial rests of Malassez

43. What are entrapped cementoblasts called?
Proliferation - differentiation - morphogenesis
Cementocytes
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental tissues secreted as matrix in successive layers.

44. What will the dental sac give rise to?
Dental papilla
Abnormally small teeth
Oral epithelium
The cementum - PDL - and alveolar bone

45. Do odontoblasts start their secretion of matrix before the ameloblasts?
8th week
Cementocytes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
There are none - they are lost with eruption

46. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Lines of Retzuis
The outer cells of the dental papilla and the central cells of the dental papilla
The ectomesenchyme - which was influenced by the neural crest cells

47. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Initiation
The tooth germ
Proliferation - differentiation - morphogenesis

48. What are the clinical ramifications of gemination?

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49. What are the etiological factors of tubercle?
When the gingiva recedes and no actual tooth movement takes place
Trauma - pressure or metabolic disease
Proliferation
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.

50. What are the formative cells for cementum?
Odontoblastic process
The cervical loop
Preameloblasts
Cementoblasts