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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 is the predominate process in the bell 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.
4 types
Differentiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

2. The stratum intermediate is located inner or outer?
Inner
In the cap stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
There are none - they are lost with eruption

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

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4. What stage does anodontia occur?
The bud stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Initiation stage
Extra cusp due to effects on enamel organ

5. Which teeth are nonsuccedaneous?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The permanent molars
Inner

6. What is enamel dysplasia?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ectomesenchyme
The enamel - dentin - and cementum are secreted in successive layers
Faulty development of enamel from interference involving ameloblasts

7. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The ameloblasts
Into odontoblasts
The bud stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

8. What is amelogenisis?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The apposition of the enamel matrix
Hereditary in localized form. endocrine dysfunction is complete
Traumatic injury or crowding of teeth

9. What is microdontia?
Abnormally small teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Union of root structure of two or more teeth by cementum
Compressed layer of flat to cuboidal cells

10. What is the predominate process of the cap stage?
Morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementoid
The ectomesenchyme

11. What are the etiological factors for dens in dente and gemination?
Oral epithelium
Cuboidal cells
Hereditary
Trauma - pressure or metabolic disease

12. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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

13. What is the primordium of the tooth?
Enamel organ invaginates into the dental papilla
Only dentinal tubules with processes
Imbrication lines of von Ebner
The tooth germ

14. How is the reduced enamel epithelium created?
Abnormally large teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
A bilayer rim that consists only IEE and OEE
The enamel organ is compressed

15. Where is the dental papilla originally derived from?
Displacement of ameloblasts to root surface
Odontoblastic process
The ectomesenchyme - which was influenced by the neural crest cells
Initiation

16. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Lines of Retzuis
The basement membrane that seperates the enamel organ and dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

17. What are the mature cells for enamel?
There are none - they are lost with eruption
The ectomesenchyme - which was influenced by the neural crest cells
The cementum - PDL - and alveolar bone
Odontoblasts

18. What hard tissue has vascularity?
The basement membrane that seperates the enamel organ and dental papilla
A mineralized cylinder - the dentinal tubule
A bilayer rim that consists only IEE and OEE
Alveolar bone

19. What will the inner cells of the dental lamina differentiates into?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Extra cusp due to effects on enamel organ
The primordium of the pulp
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

20. What are the etiological factors for anodontia?
Odontoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
There is unequal growth in different parts of the tooth bud
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

21. When does dens in dente occur?
Pressure on the area
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The bud stage
During the cap stage

22. The stellate reticulum is located inner or outer?
Outer
Abnormally large teeth
The outer cells of the dental papilla and the central cells of the dental papilla
Common with permanent maxillary molars

23. What are the mature cells for dentin?
Osteoblasts
Cementocytes
The bud stage
Only dentinal tubules with processes

24. What is the cap in the cap stage?
Extra cusp due to effects on enamel organ
The enamel organ
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Only dentinal tubules with processes

25. What are entrapped cementoblasts called?
In the cap stage
The enamel - dentin - and cementum are secreted in successive layers
9th to 10th weeks
Cementocytes

26. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The tooth germ
Displacement of ameloblasts to root surface
8th week

27. Where is the dental sac originally derived from?
The ectomesenchyme
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementocytes
The enamel organ

28. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Hereditary
Tooth germ
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

29. What is the process involved in the maturation stage?
Maturation
Enamel pearl - enamel dysplasia - and concresence
Ameloblasts
Common with permanent maxillary molars

30. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Apposition of the cementum
Abnormally small teeth
Maturation

31. What is anodontia?
Induction
Absence of single or multiple teeth
The enamel organ - dental papilla - dental sac
A mineralized cylinder - the dentinal tubule

32. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Oral epithelium
Absence of single or multiple teeth
Abnormally small teeth

33. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
In the cap stage
Union of 2 adjacent tooth germs
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

34. What is concrescence?
The ectomesenchyme
Union of root structure of two or more teeth by cementum
As a result of the apposition of cementum over dentin
Alveolar bone

35. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Extra cusp due to effects on enamel organ
Union of root structure of two or more teeth by cementum
The basement membrane
Induction

36. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Future dentin and pulp tissue
The outer cells of the dental papilla and the central cells of the dental papilla
Enamel pearl - enamel dysplasia - and concresence

37. How is the dentinocemental junction formed?
The outer enamel epithelium
In the cap stage
As a result of the apposition of cementum over dentin
Commonly involves permanent maxillary lateral incisor and 3rd molars

38. What else undergoes proliferation in the bud stage besides the dental lamina?
There is unequal growth in different parts of the tooth bud
Lines of Retzuis
Local or systemic or hereditary
The ectomesenchyme

39. What will the dental sac give rise to?
As a result of the apposition of cementum over dentin
Odontoblasts
The cementum - PDL - and alveolar bone
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

40. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Traumatic injury or crowding of teeth
8th week
Tooth germ
When the gingiva recedes and no actual tooth movement takes place

41. What is the time span for the bell stage?
11th to 12th weeks
The dental lamina
In the cap stage
A bilayer rim that consists only IEE and OEE

42. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ectomesenchyme - which was influenced by the neural crest cells
Induction - proliferation

43. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The bud stage
The basement membrane
Bud stage
Differentiation - proliferation - morphogenesis

44. What happens during initiation?
Dental tissues fully mineralize to their mature levels.
Common with permanent maxillary molars
Dentin secreting cells (odontoblats)
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

45. What type of tissue is dentin - cementum - and alveolar bone?
Tooth germ
The outer cells of the dental papilla and the central cells of the dental papilla
Maturation
Connective

46. What are the major components of the tooth germ?
The basement membrane
The enamel organ - dental papilla - dental sac
The permanent molars
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

47. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
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 permanent molars
The ameloblasts place an acellular dental cuticle on the new enamel surface
Displacement of ameloblasts to root surface

48. What is an enamel pearl?
Dental follicle
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Sphere of enamel on root
Common with permanent maxillary molars

49. What are succedaneous teeth?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Oral epithelium
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation

50. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Traumatic injury or crowding of teeth
Odontoclasts
Abnormally large teeth