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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 the cap in the cap stage?
The dental lamina
Common on permanent molars or cingulum of anterior teeth
Differentiation
The enamel organ

2. What is fusion?
The cementum - PDL - and alveolar bone
Union of 2 adjacent tooth germs
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane

3. What kind of cells occur in the inner enamel epithelium?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
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
Dental papilla
Tall columnar cells

4. Where is the dental sac originally derived from?
Absence of single or multiple teeth
Extra cusp due to effects on enamel organ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme

5. What are the etiological factors for fusion?
Tooth germ tries to divide
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary in localized form. endocrine dysfunction is complete
Pressure on the area

6. What is the main process involved in initiation?
Faulty development of enamel from interference involving ameloblasts
9th to 10th weeks
Induction
The apposition of the enamel matrix

7. How many types of cells are found in the enamel organ in the bell stage?
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
Future dentin and pulp tissue
4 types
The primordium of the pulp

8. Which teeth are nonsuccedaneous?
4 types
Absence of single or multiple teeth
The permanent molars
Cementoblasts

9. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Differentiation
There are none - they are lost with eruption
Cuboidal cells

10. What are the formative cells for cementum?
Cementoblasts
Induction - proliferation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Morphogenesis

11. What is the cementum matrix called?
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 enamel organ - dental papilla - dental sac
Cementoid
A mineralized cylinder - the dentinal tubule

12. What are the clinical ramifications of concrescence?
The bud stage
Common with permanent maxillary molars
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
6th to 7th weeks

13. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Osteoblasts
Cementoid
The ameloblasts
A mineralized cylinder - the dentinal tubule

14. What is cementogenisis?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating 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
There is unequal growth in different parts of the tooth bud
Apposition of the cementum

15. What hard tissue is can not have tissue formation after eruption?
Enamel
The basement membrane that seperates the enamel organ and dental papilla
Initiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

16. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction - proliferation
8th week
A mineralized cylinder - the dentinal tubule

17. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Proliferation
Enamel organ
Cementocytes

18. What is tubercle?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
9th to 10th weeks
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Extra cusp due to effects on enamel organ

19. Where is the enamal organ originally derived from?
Abnormally small teeth
The ectoderm
9th to 10th weeks
Cementoblasts

20. What is microdontia?
Extra cusp due to effects on enamel organ
Abnormally small teeth
The enamel - dentin - and cementum are secreted in successive layers
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

21. When does the tooth bud become a tooth germ?
When the gingiva recedes and no actual tooth movement takes place
In the cap stage
8th week
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

22. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Future dentin and pulp tissue
The actual vertical movement of the tooth
Development of one or more extra teeth

23. Do odontoblasts start their secretion of matrix before the ameloblasts?
The outer cells of the dental papilla and the central cells of the dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ameloblasts
Displacement of ameloblasts to root surface

24. What happens when the reduced enamel epithelium is created?
Proliferation
Osteocytes
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
4 types

25. What will the outer cells of the dental lamina differentiate into?
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
Dentin secreting cells (odontoblats)
Trauma - pressure or metabolic disease
Cementoblasts

26. What is the predominate process of the cap stage?
In the cap stage
Bud stage
Morphogenesis
The ameloblasts

27. What layer serves as protection for the enamel organ?
Odontoblastic process
The enamel organ is compressed
The outer enamel epithelium
Hereditary

28. What stage does supernumerary teeth occur?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The cervical loop
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Initiation

29. What is the time span for the bell stage?
Union of 2 adjacent tooth germs
Connective
11th to 12th weeks
Outer

30. What is enamel dysplasia?
Osteocytes
Faulty development of enamel from interference involving ameloblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Union of 2 adjacent tooth germs

31. What is the outer portion of the ectoderm in the initiation stage?
Enamel secreting cells (ameloblasts)
Oral epithelium
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
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

32. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Initiation stage
The apposition of the enamel matrix
The outer cells of the dental papilla and the central cells of the dental papilla

33. What is the site for the future dentioenamel junction?
Osteocytes
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementoblasts
The basement membrane that seperates the enamel organ and dental papilla

34. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Dens in dente - gemination - tubercle - and fusion
4 types
Only dentinal tubules with processes

35. What are the clinical ramifications of gemination?

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36. What kind of cells reside in the stratum intermediate?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Displacement of ameloblasts to root surface
Maturation
Compressed layer of flat to cuboidal cells

37. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The ectomesenchyme - which was influenced by the neural crest cells
Preameloblasts
Pressure on the area
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

38. What are the incremental lines for enamel?
Initiation stage
Abnormally small teeth
Lines of Retzuis
The apposition of the enamel matrix

39. Tooth development
The enamel organ - dental papilla - dental sac
Extra cusp due to effects on enamel organ
The basement membrane
Odontogenesis

40. The oral epithelium is induced by the ectomesenchyme to produce what?
Proliferation - differentiation - morphogenesis
The dental lamina
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Common on permanent molars or cingulum of anterior teeth

41. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
11th to 12th weeks
Cementocytes
Cementoblasts
The outer cells of the dental papilla and the central cells of the dental papilla

42. What will the dental papilla eventually form?
Future dentin and pulp tissue
Local or systemic or hereditary
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
A mineralized cylinder - the dentinal tubule

43. What are supernumerary teeth?
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.
Development of one or more extra teeth
During the cap stage
Induction

44. What are the major components of the tooth germ?
Dental follicle
Dentin and alveolar bone
Bud stage
The enamel organ - dental papilla - dental sac

45. What stage does anodontia occur?
The ectomesenchyme
Initiation stage
Into odontoblasts
Dental tissues secreted as matrix in successive layers.

46. The stratum intermediate is located inner or outer?
Tooth germ tries to divide
Local or systemic or hereditary
Inner
Common on permanent molars or cingulum of anterior teeth

47. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Hereditary
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.
Arrest and reversal lines

48. When does dens in dente occur?
Preameloblasts
The basement membrane
Cementoid
During the cap stage

49. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Tooth germ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

50. What does the cervical loop consist of?
Dentin secreting cells (odontoblats)
A bilayer rim that consists only IEE and OEE
Abnormally small teeth
8th week

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Dentistry Tooth Development And Eruption

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