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

2. What are entrapped cementoblasts called?
Maturation
Cementocytes
During the cap stage
Extra cusp due to effects on enamel organ

3. What is matrix?
Differentiation - proliferation - morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Common on permanent molars or cingulum of anterior teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

4. What type of tissue is dentin - cementum - and alveolar bone?
Connective
11th to 12th weeks
The basement membrane that seperates the enamel organ and dental papilla
The enamel - dentin - and cementum are secreted in successive layers

5. When does the process of root development take place?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction - proliferation

6. How is the dentinocemental junction formed?
Development of one or more extra teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
As a result of the apposition of cementum over dentin
Union of root structure of two or more teeth by cementum

7. What are the etiological factors for fusion?
Preameloblasts
Pressure on the area
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Ameloblasts

8. What will the dental papilla eventually form?
Hereditary
Future dentin and pulp tissue
The actual vertical movement of the tooth
Morphogenesis

9. What is the outer portion of the ectoderm in the initiation stage?
Lines of Retzuis
Oral epithelium
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Trauma - pressure or metabolic disease

10. What are the clinical ramifications of dens in dente?
Cementocytes
The outer enamel epithelium
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

11. What are the clinical ramifications of concrescence?
The enamel - dentin - and cementum are secreted in successive layers
Osteocytes
Common with permanent maxillary molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

12. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The enamel organ
Epithelial rests of Malassez
Oral epithelium

13. What is microdontia?
Abnormally small teeth
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
Arrest and reversal lines
The dental sac

14. What are the clinical ramifications of enamel dysplasia?
The bud 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
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementocytes

15. What stage does anodontia occur?
Initiation stage
Dental papilla
The bud stage
Enamel pearl - enamel dysplasia - and concresence

16. What are the incremental lines for enamel?
Maturation
Lines of Retzuis
Osteocytes
The basement membrane

17. What happens during the maturation stage?
Compressed layer of flat to cuboidal cells
Displacement of ameloblasts to root surface
The bud stage
Dental tissues fully mineralize to their mature levels.

18. What is the primordium of the tooth?
Future dentin and pulp tissue
The tooth germ
Odontogenesis
Preameloblasts

19. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Into odontoblasts
When the gingiva recedes and no actual tooth movement takes place

20. What is the embryological background for enamel?
There are none - they are lost with eruption
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentin secreting cells (odontoblats)
Enamel organ

21. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
May be confused as calculus deposit on root
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

22. Tooth development
There is unequal growth in different parts of the tooth bud
Cementocytes
Bud stage
Odontogenesis

23. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla
Displacement of ameloblasts to root surface

24. What happens during initiation?
Proliferation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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

25. What happens during the apposition stage?
The enamel organ - dental papilla - dental sac
Dental tissues secreted as matrix in successive layers.
The dental lamina
Dental papilla

26. What will the outer cells of the dental lamina differentiate into?
Enamel organ
Dentin secreting cells (odontoblats)
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoclasts

27. What are the incremental lines for cementum and alveolar bone?
Hereditary
Arrest and reversal lines
Hereditary
The outer enamel epithelium

28. In the cap stage the tooth bud does not grow - what happens?
The enamel organ is compressed
Dentin and alveolar bone
There is unequal growth in different parts of the tooth bud
Enamel organ invaginates into the dental papilla

29. What layer serves as protection for the enamel organ?
Epithelial rests of Malassez
The outer enamel epithelium
Common on permanent molars or cingulum of anterior teeth
Dentin and alveolar bone

30. What is the time span for the bud stage?
Bud stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
8th week
A mineralized cylinder - the dentinal tubule

31. What else undergoes proliferation in the bud stage besides the dental lamina?
There are none - they are lost with eruption
The ectomesenchyme
Common with permanent maxillary molars
Arrest and reversal lines

32. What is amelogenisis?
Arrest and reversal lines
Development of one or more extra teeth
Dental papilla
The apposition of the enamel matrix

33. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Union of 2 adjacent tooth germs
The tooth germ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

34. The stratum intermediate is located inner or outer?
Differentiation
Hereditary
A bilayer rim that consists only IEE and OEE
Inner

35. What is fusion?
Oral epithelium
The ectomesenchyme
Connective
Union of 2 adjacent tooth germs

36. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontogenesis
Trauma - pressure or metabolic disease

37. What are the clinical ramifications of supernumerary teeth?
Cementocytes
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Enamel pearl - enamel dysplasia - and concresence
Only dentinal tubules with processes

38. What is the function of the Hertwig's epithelial root sheath?
Dental papilla
Traumatic injury or crowding of teeth
Absence of single or multiple teeth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

39. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Cementocytes
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

40. What are the development disturbances of the apposition and maturation stages?
Proliferation
Oral epithelium
Extra cusp due to effects on enamel organ
Enamel pearl - enamel dysplasia - and concresence

41. Which teeth are nonsuccedaneous?
The permanent molars
When the gingiva recedes and no actual tooth movement takes place
During the cap stage
Only dentinal tubules with processes

42. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Cementoid
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary in localized form. endocrine dysfunction is complete

43. What are the mature cells for dentin?
When the gingiva recedes and no actual tooth movement takes place
Only dentinal tubules with processes
The cementum - PDL - and alveolar bone
The basement membrane

44. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The cementum - PDL - and alveolar bone
Cementoblasts
Enamel secreting cells (ameloblasts)

45. 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.
The outer enamel epithelium
A mineralized cylinder - the dentinal tubule
The bud stage

46. What are the mature cells for enamel?
Tooth germ tries to divide
There are none - they are lost with eruption
Dental papilla
The dental lamina

47. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
When the gingiva recedes and no actual tooth movement takes place
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
6th to 7th weeks

48. What are the major components of the tooth germ?
Hereditary
The enamel organ - dental papilla - dental sac
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
A bilayer rim that consists only IEE and OEE

49. What is the main process involved in the bud stage?
Bud stage
The basement membrane
Cementoblasts
Proliferation

50. How many types of cells are found in the enamel organ in the bell stage?
4 types
Imbrication lines of von Ebner
The outer cells of the dental papilla and the central cells of the dental papilla
Extra cusp due to effects on enamel organ

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Dentistry Tooth Development And Eruption

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