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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 cell layers found in the enamel organ in the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Maturation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Pressure on the area

2. What does the cervical loop consist of?
The stellate reticulum
Inner
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

3. What are the odontoblastic processes is contained in what?
Inner
It disintegrates as the developing oral mucosa comes to line the oral cavity
A mineralized cylinder - the dentinal tubule
Maturation

4. What is the time span for initiation?
The permanent molars
6th to 7th weeks
When the gingiva recedes and no actual tooth movement takes place
Common with permanent maxillary molars

5. What is tubercle?
Dental tissues secreted as matrix in successive layers.
Extra cusp due to effects on enamel organ
Cementocytes
The cementum - PDL - and alveolar bone

6. What are the mature cells for enamel?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementoid
There are none - they are lost with eruption
Odontogenesis

7. What is enamel dysplasia?
Bud stage
Faulty development of enamel from interference involving ameloblasts
Lines of Retzuis
In the cap stage

8. What are the formative cells for cementum?
Extra cusp due to effects on enamel organ
The enamel organ is compressed
Cementoblasts
Proliferation - differentiation - morphogenesis

9. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Extra cusp due to effects on enamel organ
The permanent molars
Preameloblasts
There is unequal growth in different parts of the tooth bud

10. What is the embryological background for enamel?
As a result of the apposition of cementum over dentin
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Enamel organ
8th week

11. What are the clinical ramifications of gemination?

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12. What kind of cells occur in the inner enamel epithelium?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Tall columnar cells
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

13. What are the incremental lines for cementum and alveolar bone?
The ectomesenchyme
Arrest and reversal lines
Differentiation - proliferation - morphogenesis
Abnormally small teeth

14. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Maturation
Differentiation
Cementoblasts
The ectomesenchyme

15. The stratum intermediate is located inner or outer?
The basement membrane
The cervical loop
Initiation
Inner

16. What is the time span for the bud stage?
8th week
Differentiation - proliferation - morphogenesis
Commonly involves permanent maxillary lateral incisor and 3rd molars
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

17. What are the etiological factors of enamel dysplasia?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Local or systemic or hereditary
Hereditary in localized form. endocrine dysfunction is complete
Commonly involves permanent maxillary lateral incisor and 3rd molars

18. What hard tissue has vascularity?
Enamel organ invaginates into the dental papilla
As a result of the apposition of cementum over dentin
Alveolar bone
Dental follicle

19. Tooth development
May be confused as calculus deposit on root
Odontogenesis
Oral epithelium
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

20. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Extra cusp due to effects on enamel organ
Tooth germ tries to divide
As a result of the apposition of cementum over dentin

21. What else undergoes proliferation in the bud stage besides the dental lamina?
Dental tissues secreted as matrix in successive layers.
The ectomesenchyme
The ectoderm
Commonly involves permanent maxillary lateral incisor and 3rd molars

22. What are the incremental lines for dentin?
Hereditary
Only dentinal tubules with processes
Imbrication lines of von Ebner
The ectomesenchyme

23. What are succedaneous teeth?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Local or systemic or hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cuboidal cells

24. What are the formative cells for dentin?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The basement membrane
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
Odontoblasts

25. What is dens in dente?
Enamel organ invaginates into the dental papilla
The tooth germ
It disintegrates as the developing oral mucosa comes to line the oral cavity
The ectomesenchyme

26. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Common on permanent molars or cingulum of anterior teeth
Development of one or more extra teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
During the cap stage

27. What hard tissue is innervated by nerves?
Local or systemic or hereditary
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental papilla
Dentin and alveolar bone

28. What happens during the cap stage?
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.
Dens in dente - gemination - tubercle - and fusion
Ameloblasts
Osteoblasts

29. What are the incremental lines for enamel?
Cementoid
Lines of Retzuis
The bud stage
Extra cusp due to effects on enamel organ

30. What are the mature cells for cementum?
Cementocytes
The ectoderm
Odontoblastic process
Abnormally small teeth

31. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Development of one or more extra teeth
Dentin and alveolar bone
May be confused as calculus deposit on root

32. What do the odontoblasts do?
Ameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Hereditary

33. What are the etiological factors for enamel pearl?
When the gingiva recedes and no actual tooth movement takes place
Displacement of ameloblasts to root surface
Osteocytes
The ectomesenchyme

34. What is the site for the future dentioenamel junction?
Dental papilla
Common with permanent maxillary molars
The basement membrane that seperates the enamel organ and dental papilla
11th to 12th weeks

35. What is macrodontia?
Common with permanent maxillary molars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Abnormally large teeth
The enamel organ - dental papilla - dental sac

36. What will the outer cells of the dental lamina differentiate into?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
There is unequal growth in different parts of the tooth bud
Odontogenesis
Dentin secreting cells (odontoblats)

37. What is fusion?
The ectomesenchyme - which was influenced by the neural crest cells
Union of 2 adjacent tooth germs
Sphere of enamel on root
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

38. What is cementogenisis?
Tall columnar cells
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Development of one or more extra teeth
Apposition of the cementum

39. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The ectomesenchyme - which was influenced by the neural crest cells
The basement membrane that seperates the enamel organ and dental papilla
There is unequal growth in different parts of the tooth bud
Dental papilla

40. What is the main process involved in the bud stage?
8th week
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The stellate reticulum
Proliferation

41. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Cementoblasts
The ectomesenchyme
The ectomesenchyme - which was influenced by the neural crest cells

42. What is amelogenisis?
Pressure on the area
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The apposition of the enamel matrix

43. What is concrescence?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Union of root structure of two or more teeth by cementum
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

44. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The enamel - dentin - and cementum are secreted in successive layers
Odontoblastic process
The outer cells of the dental papilla and the central cells of the dental papilla
Only dentinal tubules with processes

45. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
As a result of the apposition of cementum over dentin
Imbrication lines of von Ebner
Pressure on the area
Odontoclasts

46. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
The basement membrane
Oral epithelium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

47. What is the time span for the bell stage?
Enamel secreting cells (ameloblasts)
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The dental sac
11th to 12th weeks

48. What are the etiological factors of tubercle?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Trauma - pressure or metabolic disease
Proliferation - differentiation - morphogenesis
Morphogenesis

49. What will the dental papilla eventually form?
Dental follicle
Cementoid
Future dentin and pulp tissue
Only dentinal tubules with processes

50. What are the clinical ramifications of enamel pearl?
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.
Pressure on the area
Odontoblastic process
May be confused as calculus deposit on root