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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 are the clinical ramifications of micro/macrodontia?
Imbrication lines of von Ebner
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Commonly involves permanent maxillary lateral incisor and 3rd molars
4 types

2. What layer serves as protection for the enamel organ?
11th to 12th weeks
The ectomesenchyme
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer enamel epithelium

3. What is the process involved in the maturation stage?
Maturation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoblasts
Osteocytes

4. What happens to the thickened non tooth producing portions of the dental lamina eventually?
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
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementoblasts

5. What are the etiological factors for micro/macrodontia?
Epithelial
Hereditary in localized form. endocrine dysfunction is complete
Dentin secreting cells (odontoblats)
The permanent molars

6. What are the incremental lines for enamel?
Induction
Lines of Retzuis
It disintegrates as the developing oral mucosa comes to line the oral cavity
Differentiation

7. What is tubercle?
Initiation
Only dentinal tubules with processes
Extra cusp due to effects on enamel organ
Traumatic injury or crowding of teeth

8. What are the formative cells for alveolar bone?
Osteoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentin and alveolar bone

9. Which layer in the bell stage has star shaped cells?
Dens in dente - gemination - tubercle - and fusion
The stellate reticulum
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
Trauma - pressure or metabolic disease

10. What are the incremental lines for dentin?
The outer cells of the dental papilla and the central cells of the dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Imbrication lines of von Ebner

11. When does the process of root development take place?
The apposition of the enamel matrix
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Tooth germ
9th to 10th weeks

12. Active eruption
The actual vertical movement of the tooth
The enamel organ is compressed
Odontoblastic process
9th to 10th weeks

13. Tooth development
Odontoclasts
There are none - they are lost with eruption
Odontogenesis
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

14. The stellate reticulum is located inner or outer?
Osteoblasts
May be confused as calculus deposit on root
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Outer

15. What happens during the maturation stage?
Enamel pearl - enamel dysplasia - and concresence
Dental tissues fully mineralize to their mature levels.
11th to 12th weeks
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

16. Which teeth are nonsuccedaneous?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ectomesenchyme
Epithelial
The permanent molars

17. The stratum intermediate is located inner or outer?
Lines of Retzuis
Ameloblasts
Inner
Enamel organ invaginates into the dental papilla

18. What is the embryological background for dentin - cementum and alveolar bone?
The stellate reticulum
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental papilla
Odontoclasts

19. What is the cap in the cap stage?
The actual vertical movement of the tooth
Odontoblastic process
The enamel organ
Displacement of ameloblasts to root surface

20. What is the time span for the cap stage?
9th to 10th weeks
Epithelial
Proliferation
Maturation

21. What are the mature cells for cementum?
Trauma - pressure or metabolic disease
The cementum - PDL - and alveolar bone
The permanent molars
Cementocytes

22. What are the clinical ramifications of gemination?

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23. What are the etiological factors for enamel pearl?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementoblasts
Displacement of ameloblasts to root surface
The enamel - dentin - and cementum are secreted in successive layers

24. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Only dentinal tubules with processes
The ectomesenchyme
Cementocytes
Preameloblasts

25. What happens during the cap stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dentin and alveolar bone
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.
There are none - they are lost with eruption

26. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Pressure on the area
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental sac
Dental papilla

27. What is fusion?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
A mineralized cylinder - the dentinal tubule
Union of 2 adjacent tooth germs
Odontoblastic process

28. Where is the dental papilla originally derived from?
Lines of Retzuis
Differentiation - proliferation - morphogenesis
Induction - proliferation
The ectomesenchyme - which was influenced by the neural crest cells

29. What kind of cells occur in the outer enamel epithelium in the bell stage?
Odontoclasts
Dentin secreting cells (odontoblats)
Cuboidal cells
Common on permanent molars or cingulum of anterior teeth

30. What is the structure responsible for root development?
8th week
Proliferation
The cervical loop
The cementum - PDL - and alveolar bone

31. What is macrodontia?
Abnormally large teeth
Common with permanent maxillary molars
Alveolar bone
The outer cells of the dental papilla and the central cells of the dental papilla

32. What are the clinical ramifications of enamel dysplasia?
Lines of Retzuis
Absence of single or multiple teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Maturation

33. What are the development disturbances of the apposition and maturation stages?
Epithelial
Enamel pearl - enamel dysplasia - and concresence
Connective
Maturation

34. What is the time span for the bell stage?
The outer cells of the dental papilla and the central cells of the dental papilla
11th to 12th weeks
Trauma - pressure or metabolic disease
When the gingiva recedes and no actual tooth movement takes place

35. What is concrescence?
Union of root structure of two or more teeth by cementum
Local or systemic or hereditary
A bilayer rim that consists only IEE and OEE
The enamel organ - dental papilla - dental sac

36. What are the incremental lines for cementum and alveolar bone?
11th to 12th weeks
Arrest and reversal lines
Abnormally large teeth
Pressure on the area

37. What are supernumerary teeth?
The actual vertical movement of the tooth
Development of one or more extra teeth
Initiation stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

38. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Tall columnar cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The enamel - dentin - and cementum are secreted in successive layers

39. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Local or systemic or hereditary
The basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Osteocytes

40. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Pressure on the area
Dental papilla
Lines of Retzuis
The basement membrane

41. What happens during the appositional stage?
Connective
Ameloblasts
The enamel - dentin - and cementum are secreted in successive layers
The apposition of the enamel matrix

42. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Future dentin and pulp tissue
Outer
The ameloblasts place an acellular dental cuticle on the new enamel surface
4 types

43. What are the etiological factors for supernumerary teeth?
Hereditary
Osteocytes
Arrest and reversal lines
Enamel secreting cells (ameloblasts)

44. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Induction - proliferation
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
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dental tissues fully mineralize to their mature levels.

45. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Tall columnar cells
The enamel - dentin - and cementum are secreted in successive layers
Differentiation

46. Do odontoblasts start their secretion of matrix before the ameloblasts?
Bud stage
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
Lines of Retzuis
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

47. What kind of cells reside in the stratum intermediate?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The stellate reticulum
During the cap stage
Compressed layer of flat to cuboidal cells

48. Passive eruption
Sphere of enamel on root
9th to 10th weeks
When the gingiva recedes and no actual tooth movement takes place
Dentin secreting cells (odontoblats)

49. What happens during initiation?
Only dentinal tubules with processes
Hereditary in localized form. endocrine dysfunction is complete
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
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

50. What is anodontia?
Absence of single or multiple teeth
Tooth germ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Outer