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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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1. What are the incremental lines for dentin?
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
Induction
Imbrication lines of von Ebner
Dental follicle

2. What else undergoes proliferation in the bud stage besides the dental lamina?
Enamel pearl - enamel dysplasia - and concresence
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Maturation
The ectomesenchyme

3. What will the dental papilla eventually form?
Future dentin and pulp tissue
Cuboidal cells
Epithelial
Dental papilla

4. Where is the enamal organ originally derived from?
The ectoderm
Maturation
Maturation
The permanent molars

5. What kind of cells occur in the outer enamel epithelium in the bell stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cuboidal cells
Enamel
9th to 10th weeks

6. What is the predominate process in the bell stage?
The primordium of the pulp
Differentiation
The basement membrane that seperates the enamel organ and dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

7. What are the formative cells for enamel?
Osteocytes
Induction - proliferation
Enamel organ invaginates into the dental papilla
Ameloblasts

8. What are the clinical ramifications of enamel pearl?
Odontoblasts
May be confused as calculus deposit on root
Dental tissues secreted as matrix in successive layers.
Trauma - pressure or metabolic disease

9. What is matrix?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

10. What is the main process involved in initiation?
Epithelial
The enamel organ
Induction
Tooth germ tries to divide

11. The stratum intermediate is located inner or outer?
The outer enamel epithelium
Abnormally small teeth
6th to 7th weeks
Inner

12. Active eruption
The actual vertical movement of the tooth
Proliferation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dens in dente - gemination - tubercle - and fusion

13. 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
Odontoblastic process
Initiation stage
The actual vertical movement of the tooth

14. What stage does supernumerary teeth occur?
Enamel organ
In the cap stage
Bud stage
Initiation

15. When does macro/microdontia occur?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Bud stage
When the gingiva recedes and no actual tooth movement takes place
The permanent molars

16. What type of tissue is dentin - cementum - and alveolar bone?
Lines of Retzuis
Connective
The enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars

17. What is the outer portion of the ectoderm in the initiation stage?
The ectomesenchyme
Enamel organ invaginates into the dental papilla
Oral epithelium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

18. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Lines of Retzuis
Development of one or more extra teeth
Dentin secreting cells (odontoblats)

19. What are entrapped cementoblasts called?
Dental papilla
The dental sac
Induction - proliferation
Cementocytes

20. Do odontoblasts start their secretion of matrix before the ameloblasts?
Initiation stage
Apposition of the cementum
May be confused as calculus deposit on root
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

21. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Common with permanent maxillary molars
Hereditary
Hereditary

22. What are the mature cells for cementum?
Cementocytes
Lines of Retzuis
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Hereditary

23. How is the reduced enamel epithelium created?
The enamel organ is compressed
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane
Into odontoblasts

24. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
May be confused as calculus deposit on root
Common with permanent maxillary molars
Outer

25. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Sphere of enamel on root
Dens in dente - gemination - tubercle - and fusion
The enamel organ

26. What are the etiological factors of tubercle?
9th to 10th weeks
Apposition of the cementum
Hereditary
Trauma - pressure or metabolic disease

27. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Ameloblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementoblasts

28. How many types of cells are found in the enamel organ in the bell stage?
4 types
May be confused as calculus deposit on root
Initiation stage
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

29. What is the cementum matrix called?
Bud stage
Proliferation
Cementoid
8th week

30. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Cementoid
Hereditary
Into odontoblasts

31. What are the incremental lines for enamel?
Apposition of the cementum
Lines of Retzuis
Induction
As a result of the apposition of cementum over dentin

32. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Hereditary
Union of 2 adjacent tooth germs
May be confused as calculus deposit on root

33. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Cementocytes
The ameloblasts
Hereditary in localized form. endocrine dysfunction is complete
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

34. Where is the dental sac originally derived from?
The apposition of the enamel matrix
Tooth germ tries to divide
The cementum - PDL - and alveolar bone
The ectomesenchyme

35. What do the odontoblasts do?
Osteocytes
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The basement membrane

36. What is amelogenisis?
Osteocytes
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
In the cap stage

37. What are the mature cells for enamel?
Union of 2 adjacent tooth germs
The actual vertical movement of the tooth
There are none - they are lost with eruption
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

38. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
The enamel organ is compressed
The ectomesenchyme - which was influenced by the neural crest cells
Tooth germ tries to divide

39. What happens during initiation?
Traumatic injury or crowding of teeth
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 outer enamel epithelium
Hereditary in localized form. endocrine dysfunction is complete

40. What happens during the apposition stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoclasts
Dental tissues secreted as matrix in successive layers.

41. 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
Dentin secreting cells (odontoblats)
The enamel organ
The basement membrane that seperates the enamel organ and dental papilla

42. What is the site for the future dentioenamel junction?
Extra cusp due to effects on enamel organ
Dental tissues secreted as matrix 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.
The basement membrane that seperates the enamel organ and dental papilla

43. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
May be confused as calculus deposit on root
Initiation stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

44. Which teeth are nonsuccedaneous?
Initiation stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The permanent molars
In the cap stage

45. What is the main process involved in the bud stage?
Initiation stage
Proliferation
Sphere of enamel on root
As a result of the apposition of cementum over dentin

46. Where does the primordium of the permanent dentition develop?
The enamel - dentin - and cementum are secreted in successive layers
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
During the cap stage

47. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental tissues secreted as matrix in successive layers.
Cementoblasts
The bud stage

48. Tooth development
Outer
Dental papilla
Odontogenesis
Imbrication lines of von Ebner

49. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Differentiation
Dens in dente - gemination - tubercle - and fusion
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementocytes

50. What does the cervical loop consist of?
Dental tissues secreted as matrix in successive layers.
A bilayer rim that consists only IEE and OEE
Enamel organ
The bud stage

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Dentistry Tooth Development And Eruption

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