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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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1. What happens when the reduced enamel epithelium is created?
The actual vertical movement of the tooth
Maturation
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
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

2. What are the etiological factors for supernumerary teeth?
Morphogenesis
Local or systemic or hereditary
Common with permanent maxillary molars
Hereditary

3. Passive eruption
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The enamel - dentin - and cementum are secreted in successive layers
Dental papilla
When the gingiva recedes and no actual tooth movement takes place

4. What will the dental sac give rise to?
Cementoblasts
The enamel - dentin - and cementum are secreted in successive layers
The actual vertical movement of the tooth
The cementum - PDL - and alveolar bone

5. What are the processes involved in the cap stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Hereditary
Maturation
Proliferation - differentiation - morphogenesis

6. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
The stellate reticulum
Enamel organ
The cervical loop

7. What are the etiological factors of concrescence?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Epithelial rests of Malassez
As a result of the apposition of cementum over dentin
Traumatic injury or crowding of teeth

8. What are the etiological factors for fusion?
Pressure on the area
Cementoblasts
Trauma - pressure or metabolic disease
Displacement of ameloblasts to root surface

9. The stratum intermediate is located inner or outer?
Enamel pearl - enamel dysplasia - and concresence
Epithelial rests of Malassez
Enamel organ
Inner

10. What happens during the bud stage?
Dental papilla
Imbrication lines of von Ebner
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

11. What is enamel dysplasia?
Future dentin and pulp tissue
Faulty development of enamel from interference involving ameloblasts
Union of root structure of two or more teeth by cementum
Proliferation - differentiation - morphogenesis

12. What are the formative cells for enamel?
Ameloblasts
The permanent molars
Epithelial rests of Malassez
Outer

13. What is another name for the dental sac?
Cementocytes
Dental follicle
Epithelial
During the cap stage

14. Do odontoblasts start their secretion of matrix before the ameloblasts?
The ectoderm
During the cap stage
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Common on permanent molars or cingulum of anterior teeth

15. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Only dentinal tubules with processes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The dental sac
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

16. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The enamel organ is compressed
Dental papilla
The ectomesenchyme
Enamel secreting cells (ameloblasts)

17. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Maturation
Lines of Retzuis
The basement membrane

18. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Tooth germ tries to divide
Lines of Retzuis
Faulty development of enamel from interference involving ameloblasts

19. When does the tooth bud become a tooth germ?
In the cap stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The enamel organ is compressed
The ectomesenchyme - which was influenced by the neural crest cells

20. Which layer in the bell stage has star shaped cells?
The bud stage
The stellate reticulum
The ameloblasts
Dental tissues secreted as matrix in successive layers.

21. 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
Trauma - pressure or metabolic disease
Epithelial
The basement membrane that seperates the enamel organ and dental papilla

22. When does the process of root development take place?
Enamel pearl - enamel dysplasia - and concresence
The outer enamel epithelium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The ameloblasts

23. What is the predominate process in the bell stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Differentiation
Dental follicle
Trauma - pressure or metabolic disease

24. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Compressed layer of flat to cuboidal cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Epithelial rests of Malassez

25. What processes are involved in the bell stage?
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane that seperates the enamel organ and dental papilla
During the cap stage
Differentiation - proliferation - morphogenesis

26. What is the outer portion of the ectoderm in the initiation stage?
The outer cells of the dental papilla and the central cells of the dental papilla
The apposition of the enamel matrix
Induction
Oral epithelium

27. What are the mature cells for dentin?
Preameloblasts
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
Only dentinal tubules with processes

28. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Morphogenesis
The basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontogenesis

29. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Common on permanent molars or cingulum of anterior teeth
As a result of the apposition of cementum over dentin
The enamel organ - dental papilla - dental sac

30. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Abnormally small teeth
The ectomesenchyme
Initiation
The bud stage

31. What is amelogenisis?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The apposition of the enamel matrix
Dental follicle
Tooth germ tries to divide

32. What are the mature cells for enamel?
Oral epithelium
There are none - they are lost with eruption
Epithelial rests of Malassez
The basement membrane

33. What are the clinical ramifications of anodontia?
The actual vertical movement of the tooth
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane
Dens in dente - gemination - tubercle - and fusion

34. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontoclasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cuboidal cells

35. What is the time span for initiation?
Dental follicle
6th to 7th weeks
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally large teeth

36. What are supernumerary teeth?
Development of one or more extra teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental tissues secreted as matrix in successive layers.
Initiation stage

37. What is an enamel pearl?
Inner
Sphere of enamel on root
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The cementum - PDL - and alveolar bone

38. What is the time span for the bud stage?
Apposition of the cementum
Cementocytes
Common with permanent maxillary molars
8th week

39. What happens during the appositional stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
A bilayer rim that consists only IEE and OEE
The enamel - dentin - and cementum are secreted in successive layers
The dental lamina

40. What are the mature cells for cementum?
Hereditary
Cementocytes
Inner
Induction

41. In the cap stage the tooth bud does not grow - what happens?
The ameloblasts
Dental tissues secreted as matrix in successive layers.
Union of 2 adjacent tooth germs
There is unequal growth in different parts of the tooth bud

42. What are the developmental disturbances of the cap stage?
The permanent molars
There is unequal growth in different parts of the tooth bud
The primordium of the pulp
Dens in dente - gemination - tubercle - and fusion

43. What is concrescence?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Union of root structure of two or more teeth by cementum
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The actual vertical movement of the tooth

44. What are the clinical ramifications of concrescence?
Enamel secreting cells (ameloblasts)
Common with permanent maxillary molars
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
A mineralized cylinder - the dentinal tubule

45. What hard tissue has vascularity?
Dental papilla
A bilayer rim that consists only IEE and OEE
Alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity

46. What is the main process involved in initiation?
Induction
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
A mineralized cylinder - the dentinal tubule
The ectomesenchyme

47. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
The apposition of the enamel matrix
Differentiation
Enamel organ invaginates into the dental papilla

48. Which teeth are nonsuccedaneous?
Dental papilla
The permanent molars
Osteocytes
Inner

49. The preameloblasts induce dental papilla cells to differentiate into what?
The basement membrane that seperates the enamel organ and dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Into odontoblasts
Compressed layer of flat to cuboidal cells

50. What stage does supernumerary teeth occur?
Into odontoblasts
Cementoblasts
Future dentin and pulp tissue
Initiation

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Dentistry Tooth Development And Eruption

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