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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. The stellate reticulum is located inner or outer?
Union of root structure of two or more teeth by cementum
Epithelial rests of Malassez
Differentiation
Outer

2. What kind of cells reside in the stratum intermediate?
Epithelial rests of Malassez
Union of 2 adjacent tooth germs
Cuboidal cells
Compressed layer of flat to cuboidal cells

3. What is the predominate process of the cap stage?
Initiation stage
Oral epithelium
Morphogenesis
The ectomesenchyme

4. What are the etiological factors for enamel pearl?
Pressure on the area
Differentiation
Displacement of ameloblasts to root surface
Induction - proliferation

5. What else undergoes proliferation in the bud stage besides the dental lamina?
Development of one or more extra teeth
The enamel organ is compressed
The ectomesenchyme
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

6. The stratum intermediate is located inner or outer?
Oral epithelium
Cementocytes
Dentin and alveolar bone
Inner

7. Where is the dental papilla originally derived from?
Induction
The enamel organ
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
The ectomesenchyme - which was influenced by the neural crest cells

8. What are the etiological factors of concrescence?
The stellate reticulum
Traumatic injury or crowding of teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
The primordium of the pulp

9. 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
Enamel organ
Odontoblastic process
9th to 10th weeks

10. When does macro/microdontia occur?
Bud stage
Epithelial
Maturation
The outer enamel epithelium

11. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Osteocytes
Enamel secreting cells (ameloblasts)
Enamel

12. What are the clinical ramifications of gemination?

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13. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Commonly involves permanent maxillary lateral incisor and 3rd molars
A bilayer rim that consists only IEE and OEE
Dentin secreting cells (odontoblats)

14. What are the formative cells for cementum?
Union of root structure of two or more teeth by cementum
Cementoblasts
Arrest and reversal lines
The actual vertical movement of the tooth

15. Where is the dental sac originally derived from?
The ectomesenchyme
9th to 10th weeks
Odontoclasts
6th to 7th weeks

16. What stage does anodontia occur?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Initiation stage
Outer
The basement membrane

17. What is anodontia?
Compressed layer of flat to cuboidal cells
8th week
The basement membrane
Absence of single or multiple teeth

18. What are supernumerary teeth?
Differentiation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Development of one or more extra teeth
6th to 7th weeks

19. Passive eruption
Imbrication lines of von Ebner
The enamel - dentin - and cementum are secreted in successive layers
Osteocytes
When the gingiva recedes and no actual tooth movement takes place

20. What is amelogenisis?
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 apposition of the enamel matrix
9th to 10th weeks
Proliferation - differentiation - morphogenesis

21. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The enamel organ - dental papilla - dental sac
Imbrication lines of von Ebner
The outer cells of the dental papilla and the central cells of the dental papilla
The cervical loop

22. What is the process involved in the maturation stage?
The enamel organ
Apposition of the cementum
Trauma - pressure or metabolic disease
Maturation

23. What happens during the bud stage?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoclasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dentin secreting cells (odontoblats)

24. Do odontoblasts start their secretion of matrix before the ameloblasts?
Odontogenesis
The cementum - PDL - and alveolar bone
The apposition of the enamel matrix
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

25. What are the processes involved in the cap stage?
Dentin secreting cells (odontoblats)
Tooth germ tries to divide
Proliferation - differentiation - morphogenesis
Cementoblasts

26. What happens during the apposition stage?
Compressed layer of flat to cuboidal cells
Tooth germ tries to divide
Inner
Dental tissues secreted as matrix in successive layers.

27. What kind of cells occur in the outer enamel epithelium in the bell stage?
Pressure on the area
Development of one or more extra teeth
Enamel secreting cells (ameloblasts)
Cuboidal cells

28. What is the predominate process in the bell stage?
Epithelial rests of Malassez
The enamel organ is compressed
Differentiation
The outer enamel epithelium

29. What is fusion?
A mineralized cylinder - the dentinal tubule
Dental papilla
Union of 2 adjacent tooth germs
Epithelial rests of Malassez

30. What are the etiological factors of tubercle?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Hereditary in localized form. endocrine dysfunction is complete
Trauma - pressure or metabolic disease

31. What will the inner cells of the dental lamina differentiates into?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ameloblasts place an acellular dental cuticle on the new enamel surface
Common with permanent maxillary molars
The primordium of the pulp

32. What is tubercle?
Extra cusp due to effects on enamel organ
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.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity

33. What are the etiological factors for supernumerary teeth?
Dental papilla
Hereditary
The basement membrane that seperates the enamel organ and dental papilla
Maturation

34. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Arrest and reversal lines
Tooth germ
Maturation
The dental lamina

35. What are the etiological factors for anodontia?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel organ invaginates into the dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

36. What will the dental sac give rise to?
Epithelial rests of Malassez
The cementum - PDL - and alveolar bone
The dental lamina
Tooth germ

37. What hard tissue has vascularity?
Enamel
The outer enamel epithelium
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Alveolar bone

38. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
9th to 10th weeks
11th to 12th weeks
Enamel secreting cells (ameloblasts)

39. How is the dentinocemental junction formed?
When the gingiva recedes and no actual tooth movement takes place
Oral epithelium
As a result of the apposition of cementum over dentin
Dens in dente - gemination - tubercle - and fusion

40. Which layer in the bell stage has star shaped cells?
Abnormally small teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars
The stellate reticulum
Local or systemic or hereditary

41. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Maturation
It disintegrates as the developing oral mucosa comes to line the oral cavity
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dens in dente - gemination - tubercle - and fusion

42. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
The outer enamel epithelium
Compressed layer of flat to cuboidal cells
Bud stage

43. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Abnormally large teeth
Epithelial rests of Malassez
Cuboidal cells

44. What is macrodontia?
Arrest and reversal lines
Abnormally large teeth
Enamel
Dental tissues secreted as matrix in successive layers.

45. What are the incremental lines for enamel?
Lines of Retzuis
Odontoclasts
The enamel - dentin - and cementum are secreted in successive layers
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

46. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
During the cap stage
Proliferation
Dental papilla

47. Active eruption
The actual vertical movement of the tooth
The dental sac
The enamel organ is compressed
Odontoblasts

48. What is the site for the future dentioenamel junction?
The stellate reticulum
The basement membrane that seperates the enamel organ and dental papilla
Pressure on the area
The ectomesenchyme

49. What happens during initiation?
Outer
Induction - proliferation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
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

50. Tooth development
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dentin and alveolar bone
The outer enamel epithelium
Odontogenesis

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Dentistry Tooth Development And Eruption

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