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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. What is anodontia?
A mineralized cylinder - the dentinal tubule
Cementoblasts
Inner
Absence of single or multiple teeth

2. What is the primordium of the tooth?
Oral epithelium
In the cap stage
Cementocytes
The tooth germ

3. What are the clinical ramifications of supernumerary teeth?
Cuboidal cells
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
8th week
Into odontoblasts

4. What are the formative cells for alveolar bone?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Osteoblasts
Ameloblasts
Imbrication lines of von Ebner

5. What are supernumerary teeth?
Outer
Cementoblasts
Development of one or more extra teeth
Extra cusp due to effects on enamel organ

6. What is the site for the future dentioenamel junction?
Commonly involves permanent maxillary lateral incisor and 3rd molars
A bilayer rim that consists only IEE and OEE
The basement membrane that seperates the enamel organ and dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

7. How many types of cells are found in the enamel organ in the bell stage?
The basement membrane
Hereditary
Dens in dente - gemination - tubercle - and fusion
4 types

8. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Epithelial rests of Malassez
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.
Osteocytes

9. What does the cervical loop consist of?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The enamel organ - dental papilla - dental sac
A bilayer rim that consists only IEE and OEE

10. What is matrix?
Enamel organ
Enamel
Morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

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

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12. Which layer in the bell stage has star shaped cells?
The stellate reticulum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Preameloblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

13. Tooth development
Union of 2 adjacent tooth germs
Outer
Odontogenesis
Enamel pearl - enamel dysplasia - and concresence

14. Active eruption
Connective
8th week
The actual vertical movement of the tooth
Hereditary

15. What are the developmental disturbances of the cap stage?
Development of one or more extra teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dens in dente - gemination - tubercle - and fusion
The ectomesenchyme - which was influenced by the neural crest cells

16. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Induction - proliferation
The cervical loop
The dental sac
The ameloblasts

17. What happens during the bud stage?
Faulty development of enamel from interference involving ameloblasts
The outer enamel epithelium
Cementocytes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

18. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Apposition of the cementum
Tooth germ
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

19. Where is the enamal organ originally derived from?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Trauma - pressure or metabolic disease
The ectoderm

20. What else undergoes proliferation in the bud stage besides the dental lamina?
Lines of Retzuis
Arrest and reversal lines
Ameloblasts
The ectomesenchyme

21. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Cementoid
Dental papilla
The basement membrane
Cementoblasts

22. What is macrodontia?
Dental papilla
Abnormally large teeth
The basement membrane
Preameloblasts

23. What is the structure responsible for root development?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
There is unequal growth in different parts of the tooth bud
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop

24. In the cap stage the tooth bud does not grow - what happens?
Cementoid
There is unequal growth in different parts of the tooth bud
The actual vertical movement of the tooth
8th week

25. What are the etiological factors for dens in dente and gemination?
Hereditary
During the cap stage
Absence of single or multiple teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

26. What are entrapped cementoblasts called?
The enamel organ - dental papilla - dental sac
Odontoclasts
Pressure on the area
Cementocytes

27. What stage does anodontia occur?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Absence of single or multiple teeth
Initiation stage
Enamel pearl - enamel dysplasia - and concresence

28. What happens during the cap stage?
When the gingiva recedes and no actual tooth movement takes place
The enamel - dentin - and cementum are secreted in successive layers
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.
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

29. What is enamel dysplasia?
The enamel organ
Dens in dente - gemination - tubercle - and fusion
Faulty development of enamel from interference involving ameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

30. What stage does the dental tissues subsequently fully mineralize
The ectomesenchyme
Maturation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Enamel secreting cells (ameloblasts)

31. What are the etiological factors for supernumerary teeth?
Odontoclasts
Hereditary
Dental papilla
Proliferation - differentiation - morphogenesis

32. What type of tissue is enamel?
Development of one or more extra teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The permanent molars
Epithelial

33. What is another name for the dental sac?
Dentin secreting cells (odontoblats)
Tall columnar cells
Dental follicle
The cementum - PDL - and alveolar bone

34. What are the formative cells for cementum?
Cementoblasts
Sphere of enamel on root
Local or systemic or hereditary
During the cap stage

35. The stellate reticulum is located inner or outer?
The outer enamel epithelium
Outer
Future dentin and pulp tissue
Hereditary

36. What are the incremental lines for cementum and alveolar bone?
Dental tissues secreted as matrix in successive layers.
Traumatic injury or crowding of teeth
Union of 2 adjacent tooth germs
Arrest and reversal lines

37. What layer serves as protection for the enamel organ?
Into odontoblasts
The outer enamel epithelium
The ectomesenchyme
Hereditary

38. What are the clinical ramifications of anodontia?
Alveolar bone
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Development of one or more extra teeth
Odontoclasts

39. What are the mature cells for alveolar bone?
Osteocytes
Only dentinal tubules with processes
Tall columnar cells
Abnormally small teeth

40. When does the tooth bud become a tooth germ?
As a result of the apposition of cementum over dentin
In the cap stage
The cementum - PDL - and alveolar bone
Alveolar bone

41. What is amelogenisis?
Osteoblasts
The apposition of the enamel matrix
Cuboidal cells
Cementoblasts

42. What happens during the bell stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Tall columnar cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

43. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Cementoid
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ

44. Which teeth are nonsuccedaneous?
The enamel organ is compressed
The primordium of the pulp
Cementoblasts
The permanent molars

45. What is tubercle?
Cuboidal cells
The outer cells of the dental papilla and the central cells of the dental papilla
Extra cusp due to effects on enamel organ
Lines of Retzuis

46. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
As a result of the apposition of cementum over dentin
A bilayer rim that consists only IEE and OEE
The bud stage
Osteocytes

47. What are the major components of the tooth germ?
Proliferation
The enamel organ - dental papilla - dental sac
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
11th to 12th weeks

48. 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
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The tooth germ
Local or systemic or hereditary

49. What is the predominate process of the cap stage?
Dentin secreting cells (odontoblats)
Morphogenesis
Apposition of the cementum
The permanent molars

50. What is the embryological background for enamel?
Development of one or more extra teeth
The basement membrane
Enamel organ
The bud stage

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Dentistry Tooth Development And Eruption

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