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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 main process involved in the bud stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Trauma - pressure or metabolic disease
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Proliferation

2. 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
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The dental lamina
Outer

3. 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
Imbrication lines of von Ebner
The outer cells of the dental papilla and the central cells of the dental papilla
Common on permanent molars or cingulum of anterior teeth

4. How is the dentinocemental junction formed?
Dental papilla
Future dentin and pulp tissue
Dental follicle
As a result of the apposition of cementum over dentin

5. Where is the dental sac originally derived from?
Cementocytes
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel pearl - enamel dysplasia - and concresence
The ectomesenchyme

6. What stage does supernumerary teeth occur?
6th to 7th weeks
Initiation
Cementoid
Osteoblasts

7. What are supernumerary teeth?
Development of one or more extra teeth
Connective
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

8. How many types of cells are found in the enamel organ in the bell stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
4 types
Enamel organ invaginates into the dental papilla
Dentin and alveolar bone

9. What are the etiological factors for micro/macrodontia?
Odontoblasts
Epithelial rests of Malassez
Hereditary in localized form. endocrine dysfunction is complete
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

10. What are the clinical ramifications of concrescence?
9th to 10th weeks
Inner
Common with permanent maxillary molars
The stellate reticulum

11. How is the reduced enamel epithelium created?
The apposition of the enamel matrix
The enamel organ is compressed
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity

12. What are the etiological factors for supernumerary teeth?
Enamel
Union of 2 adjacent tooth germs
Hereditary
The enamel organ - dental papilla - dental sac

13. What will the dental papilla eventually form?
Future dentin and pulp tissue
11th to 12th weeks
Enamel secreting cells (ameloblasts)
Absence of single or multiple teeth

14. What are the incremental lines for enamel?
Ameloblasts
Lines of Retzuis
The enamel - dentin - and cementum are secreted in successive layers
Enamel secreting cells (ameloblasts)

15. What are the clinical ramifications of gemination?

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16. What are the mature cells for dentin?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Only dentinal tubules with processes
Odontoclasts
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.

17. What happens during the appositional stage?
Initiation
The enamel - dentin - and cementum are secreted in successive layers
Only dentinal tubules with processes
Into odontoblasts

18. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Cementocytes
Union of 2 adjacent tooth germs
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

19. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The ectoderm
Odontoclasts
The enamel organ
Abnormally small teeth

20. What is the primordium of the tooth?
The tooth germ
Enamel
Cementoblasts
The dental lamina

21. In the cap stage the tooth bud does not grow - what happens?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Arrest and reversal lines
There is unequal growth in different parts of the tooth bud
The enamel organ is compressed

22. What is the process involved in the maturation stage?
The apposition of the enamel matrix
Maturation
The ameloblasts place an acellular dental cuticle on the new enamel surface
Union of 2 adjacent tooth germs

23. What are the etiological factors for anodontia?
In the cap stage
Odontoclasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

24. What are the clinical ramifications of supernumerary teeth?
There are none - they are lost with eruption
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

25. Tooth development
Sphere of enamel on root
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Arrest and reversal lines
Odontogenesis

26. What kind of cells occur in the inner enamel epithelium?
Dental papilla
Tall columnar cells
6th to 7th weeks
Morphogenesis

27. What are the clinical ramifications of enamel pearl?
Compressed layer of flat to cuboidal cells
May be confused as calculus deposit on root
Epithelial
Maturation

28. The preameloblasts induce dental papilla cells to differentiate into what?
Odontoclasts
Compressed layer of flat to cuboidal cells
Connective
Into odontoblasts

29. The stellate reticulum is located inner or outer?
Outer
Enamel pearl - enamel dysplasia - and concresence
Imbrication lines of von Ebner
Cuboidal cells

30. What are the clinical ramifications of enamel dysplasia?
Differentiation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Connective

31. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontoblasts
Dental follicle

32. What processes are involved in the bell stage?
Cuboidal cells
Differentiation - proliferation - morphogenesis
Future dentin and pulp tissue
Enamel secreting cells (ameloblasts)

33. What stage does anodontia occur?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Induction
Initiation stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

34. What stage does the dental tissues subsequently fully mineralize
In 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.
Maturation
Proliferation

35. What are the etiological factors of tubercle?
Hereditary
Osteocytes
Common with permanent maxillary molars
Trauma - pressure or metabolic disease

36. What happens when the reduced enamel epithelium is created?
The ameloblasts
Morphogenesis
Arrest and reversal lines
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

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

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38. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Maturation
Abnormally large teeth
Epithelial

39. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
When the gingiva recedes and no actual tooth movement takes place
The primordium of the pulp
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

40. When does dens in dente occur?
During the cap stage
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
Hereditary

41. What are the etiological factors of concrescence?
There is unequal growth in different parts of the tooth bud
Cementoid
Common on permanent molars or cingulum of anterior teeth
Traumatic injury or crowding of teeth

42. 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.
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

43. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Abnormally large teeth
Cementocytes
Local or systemic or hereditary

44. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
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.

45. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The permanent molars
In the cap stage
There are none - they are lost with eruption
The bud stage

46. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Epithelial rests of Malassez
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
A bilayer rim that consists only IEE and OEE

47. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The dental lamina
Commonly involves permanent maxillary lateral incisor and 3rd molars
Tooth germ
Morphogenesis

48. What is the cap in the cap stage?
The outer enamel epithelium
The enamel organ
Apposition of the cementum
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

49. What are the major components of the tooth germ?
6th to 7th weeks
Enamel organ invaginates into the dental papilla
The enamel organ - dental papilla - dental sac
Union of 2 adjacent tooth germs

50. What are the mature cells for enamel?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Inner
Dental papilla
There are none - they are lost with eruption

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Dentistry Tooth Development And Eruption

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