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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 initiation?
The bud stage
Induction
Proliferation
Initiation

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

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3. What are the etiological factors for dens in dente and gemination?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Hereditary
Epithelial
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

4. What layer serves as protection for the enamel organ?
Enamel
Traumatic injury or crowding of teeth
Abnormally small teeth
The outer enamel epithelium

5. What are the clinical ramifications of gemination?

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6. What is the embryological background for enamel?
Enamel organ
Odontogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Commonly involves permanent maxillary lateral incisor and 3rd molars

7. What are the etiological factors for fusion?
Abnormally large teeth
A mineralized cylinder - the dentinal tubule
Pressure on the area
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

8. 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
Hereditary in localized form. endocrine dysfunction is complete
Tooth germ
The primordium of the pulp

9. What are the major components of the tooth germ?
Into odontoblasts
The ectomesenchyme
The basement membrane that seperates the enamel organ and dental papilla
The enamel organ - dental papilla - dental sac

10. What is amelogenisis?
The apposition of the enamel matrix
The cervical loop
The basement membrane
Initiation

11. What is the time span for initiation?
6th to 7th weeks
Abnormally large teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
A mineralized cylinder - the dentinal tubule

12. What happens during the bell stage?
The ameloblasts
11th to 12th weeks
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

13. What kind of cells reside in the stratum intermediate?
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Compressed layer of flat to cuboidal cells

14. What are the mature cells for alveolar bone?
Osteocytes
The permanent molars
4 types
Dens in dente - gemination - tubercle - and fusion

15. What hard tissue is can not have tissue formation after eruption?
The basement membrane that seperates the enamel organ and dental papilla
Enamel
Odontogenesis
Enamel organ invaginates into the dental papilla

16. What else undergoes proliferation in the bud stage besides the dental lamina?
9th to 10th weeks
Union of 2 adjacent tooth germs
A mineralized cylinder - the dentinal tubule
The ectomesenchyme

17. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Abnormally small teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel organ invaginates into the dental papilla
Epithelial

18. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
The enamel organ - dental papilla - dental sac
Common with permanent maxillary molars
Abnormally large teeth

19. What is the cap in the cap stage?
Osteoblasts
The enamel organ
Dentin secreting cells (odontoblats)
Large single rooted tooth with one pulp cavity and exhibits 'twinning' in crown area. normal number of teeth in dentition. may cause problems in appearance and spacing

20. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
In the cap stage
11th to 12th weeks

21. What processes are involved with the apposition stage?
Induction - proliferation
Sphere of enamel on root
The bud stage
The permanent molars

22. What is the cementum matrix called?
The ectoderm
Preameloblasts
Tooth germ
Cementoid

23. What are the etiological factors for anodontia?
Inner
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectomesenchyme
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 anodontia?
The cementum - PDL - and alveolar bone
The tooth germ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Only dentinal tubules with processes

25. What is the primordium of the tooth?
Epithelial rests of Malassez
Induction
Extra cusp due to effects on enamel organ
The tooth germ

26. What are the clinical ramifications?
The ameloblasts
Connective
Into odontoblasts
Common on permanent molars or cingulum of anterior teeth

27. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
The ectoderm
Tooth germ
Dentin and alveolar bone

28. What are the etiological factors for enamel pearl?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Inner
Dental follicle
Displacement of ameloblasts to root surface

29. What is gemination?
Differentiation - proliferation - morphogenesis
Tooth germ tries to divide
There is unequal growth in different parts of the tooth bud
Faulty development of enamel from interference involving ameloblasts

30. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
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
Alveolar bone
The basement membrane

31. What are succedaneous teeth?
There is unequal growth in different parts of the tooth bud
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The cementum - PDL - and alveolar bone
Cementocytes

32. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The outer enamel epithelium
Commonly involves permanent maxillary lateral incisor and 3rd molars
Tooth germ
Tooth germ tries to divide

33. What wll the inner enamel epithelium differentiate into?
Odontogenesis
Enamel secreting cells (ameloblasts)
Arrest and reversal lines
Differentiation - proliferation - morphogenesis

34. What are the mature cells for dentin?
Enamel
Only dentinal tubules with processes
Future dentin and pulp tissue
There is unequal growth in different parts of the tooth bud

35. What type of tissue is dentin - cementum - and alveolar bone?
Future dentin and pulp tissue
Cementoid
Connective
Only dentinal tubules with processes

36. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
There is unequal growth in different parts of the tooth bud
Pressure on the area
The dental sac
Large single rooted tooth with one pulp cavity and exhibits 'twinning' in crown area. normal number of teeth in dentition. may cause problems in appearance and spacing

37. What are the formative cells for alveolar bone?
Bud stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Local or systemic or hereditary
Osteoblasts

38. What are the clinical ramifications of micro/macrodontia?
Enamel
Faulty development of enamel from interference involving ameloblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
Odontogenesis

39. Which layer in the bell stage has star shaped cells?
The stellate reticulum
The ectoderm
Abnormally large teeth
Dental papilla

40. What will the dental papilla eventually form?
Future dentin and pulp tissue
Hereditary
Cementocytes
May be confused as calculus deposit on root

41. What are supernumerary teeth?
Local or systemic or hereditary
Development of one or more extra teeth
8th week
Outer

42. What is the main process involved in the bud stage?
Proliferation
The ameloblasts place an acellular dental cuticle on the new enamel surface
A mineralized cylinder - the dentinal tubule
Ameloblasts

43. What happens during the appositional stage?
Traumatic injury or crowding of teeth
4 types
The enamel - dentin - and cementum are secreted in successive layers
The dental sac

44. The preameloblasts induce dental papilla cells to differentiate into what?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Into odontoblasts

45. Where is the dental papilla originally derived from?
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.
Inner
The ectomesenchyme - which was influenced by the neural crest cells
The enamel organ

46. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel pearl - enamel dysplasia - and concresence
Initiation stage

47. What stage does supernumerary teeth occur?
Initiation
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 cervical loop
Dental tissues fully mineralize to their mature levels.

48. What is microdontia?
The permanent molars
Abnormally small teeth
Tooth germ
The ectoderm

49. What processes are involved in the bell stage?
Maturation
Sphere of enamel on root
The bud stage
Differentiation - proliferation - morphogenesis

50. What hard tissue has vascularity?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental tissues secreted as matrix in successive layers.
Alveolar bone
The cementum - PDL - and alveolar bone