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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 are the mature cells for dentin?
11th to 12th weeks
Epithelial
Only dentinal tubules with processes
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

2. What is microdontia?
Development of one or more extra teeth
Common with permanent maxillary molars
Only dentinal tubules with processes
Abnormally small teeth

3. What happens during the appositional stage?
Trauma - pressure or metabolic disease
The basement membrane
Enamel secreting cells (ameloblasts)
The enamel - dentin - and cementum are secreted in successive layers

4. What is the main process involved in the bud stage?
Proliferation
Common with permanent maxillary molars
The ectomesenchyme
Enamel organ invaginates into the dental papilla

5. What is cementogenisis?
Apposition of the cementum
Initiation stage
Proliferation - differentiation - morphogenesis
Morphogenesis

6. What are the incremental lines for cementum and alveolar bone?
The cementum - PDL - and alveolar bone
Arrest and reversal lines
Dentin and alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity

7. What are the major components of the tooth germ?
Local or systemic or hereditary
The enamel organ - dental papilla - dental sac
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Development of one or more extra teeth

8. What is the predominate process of the cap stage?
Morphogenesis
Induction - proliferation
Initiation
The enamel - dentin - and cementum are secreted in successive layers

9. Where does the primordium of the permanent dentition develop?
Displacement of ameloblasts to root surface
Dens in dente - gemination - tubercle - and fusion
Hereditary in localized form. endocrine dysfunction is complete
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

10. What happens during the apposition stage?
4 types
Union of root structure of two or more teeth by cementum
Dental tissues secreted as matrix in successive layers.
Development of one or more extra teeth

11. What does the cervical loop consist of?
Dental follicle
A bilayer rim that consists only IEE and OEE
Common on permanent molars or cingulum of anterior teeth
Induction

12. What are the clinical ramifications of supernumerary teeth?
Enamel secreting cells (ameloblasts)
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
Absence of single or multiple teeth

13. Where is the dental sac originally derived from?
The enamel organ is compressed
The enamel - dentin - and cementum are secreted in successive layers
The ectomesenchyme
There is unequal growth in different parts of the tooth bud

14. What are the formative cells for alveolar bone?
Osteoblasts
A bilayer rim that consists only IEE and OEE
In the cap stage
6th to 7th weeks

15. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Hereditary
Faulty development of enamel from interference involving ameloblasts
The dental sac

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

17. What type of tissue is dentin - cementum - and alveolar bone?
The ectomesenchyme
Future dentin and pulp tissue
In the cap stage
Connective

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

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19. What happens during the bell stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontogenesis
Imbrication lines of von Ebner
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

20. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Local or systemic or hereditary
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental tissues fully mineralize to their mature levels.

21. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
The enamel - dentin - and cementum are secreted in successive layers
There are none - they are lost with eruption
The outer cells of the dental papilla and the central cells of the dental papilla

22. What is tubercle?
Initiation stage
Extra cusp due to effects on enamel organ
Future dentin and pulp tissue
Enamel pearl - enamel dysplasia - and concresence

23. What kind of cells occur in the inner enamel epithelium?
As a result of the apposition of cementum over dentin
Tooth germ
Tall columnar cells
May be confused as calculus deposit on root

24. What are the incremental lines for dentin?
Union of 2 adjacent tooth germs
Imbrication lines of von Ebner
Trauma - pressure or metabolic disease
Compressed layer of flat to cuboidal cells

25. What is the process involved in the maturation stage?
Tooth germ tries to divide
Maturation
The dental sac
Sphere of enamel on root

26. What happens during initiation?
There are none - they are lost with eruption
The apposition of the enamel matrix
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

27. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Tooth germ tries to divide
The outer cells of the dental papilla and the central cells of the dental papilla

28. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Dental tissues fully mineralize to their mature levels.
Dental papilla
Absence of single or multiple teeth
The basement membrane

29. What happens during the cap stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
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.
Displacement of ameloblasts to root surface
Union of 2 adjacent tooth germs

30. What will the inner cells of the dental lamina differentiates into?
Proliferation - differentiation - morphogenesis
The primordium of the pulp
The enamel organ is compressed
The ectomesenchyme

31. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Tooth germ
Epithelial rests of Malassez
Apposition of the cementum
Extra cusp due to effects on enamel organ

32. What stage does anodontia occur?
Initiation stage
Preameloblasts
The permanent molars
Cementocytes

33. What are supernumerary teeth?
Abnormally small teeth
Development of one or more extra teeth
The bud stage
The dental sac

34. What are the formative cells for cementum?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementoblasts
Hereditary

35. What is anodontia?
Enamel organ
Arrest and reversal lines
Absence of single or multiple teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

36. What happens during the bud stage?
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
Ameloblasts
Cementocytes

37. What is the cementum matrix called?
The enamel - dentin - and cementum are secreted in successive layers
The cervical loop
Cementoid
A bilayer rim that consists only IEE and OEE

38. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
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
Tooth germ
Local or systemic or hereditary

39. What is fusion?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Union of 2 adjacent tooth germs
Dental tissues secreted as matrix in successive layers.

40. When does the process of root development take place?
Dental tissues fully mineralize to their mature levels.
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Maturation

41. Which layer in the bell stage has star shaped cells?
6th to 7th weeks
Osteocytes
The stellate reticulum
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

42. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Union of 2 adjacent tooth germs
The cervical loop
During the cap stage

43. What is the primordium of the tooth?
The cementum - PDL - and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The tooth germ
Hereditary

44. What are the formative cells for dentin?
The primordium of the pulp
Odontoblasts
In the cap stage
Alveolar bone

45. What is concrescence?
Union of 2 adjacent tooth germs
Union of root structure of two or more teeth by cementum
Initiation stage
Extra cusp due to effects on enamel organ

46. In the cap stage the tooth bud does not grow - what happens?
The stellate reticulum
Ameloblasts
Dens in dente - gemination - tubercle - and fusion
There is unequal growth in different parts of the tooth bud

47. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Pressure on the area
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Proliferation

48. What is the time span for the bud stage?
8th week
Compressed layer of flat to cuboidal cells
Tooth germ
Oral epithelium

49. 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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ - dental papilla - dental sac
Displacement of ameloblasts to root surface

50. What kind of cells reside in the stratum intermediate?
Abnormally large teeth
The apposition of the enamel matrix
There are none - they are lost with eruption
Compressed layer of flat to cuboidal cells