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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. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Abnormally large teeth
Imbrication lines of von Ebner
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

2. Which layer in the bell stage has star shaped cells?
The cementum - PDL - and alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The stellate reticulum
The basement membrane

3. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Local or systemic or hereditary
The bud stage
Extra cusp due to effects on enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars

4. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Epithelial rests of Malassez
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Compressed layer of flat to cuboidal cells

5. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
A bilayer rim that consists only IEE and OEE
Pressure on the area

6. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
6th to 7th weeks
Local or systemic or hereditary
Extra cusp due to effects on enamel organ

7. What are the etiological factors of enamel dysplasia?
Cementoblasts
The actual vertical movement of the tooth
The bud stage
Local or systemic or hereditary

8. What is the time span for the bud stage?
Enamel organ invaginates into the dental papilla
The ectomesenchyme
Dental papilla
8th week

9. What are the mature cells for cementum?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementocytes
Extra cusp due to effects on enamel organ
A mineralized cylinder - the dentinal tubule

10. What is the embryological background for dentin - cementum 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
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental papilla
Cementoid

11. What is the time span for the bell stage?
Maturation
11th to 12th weeks
Union of root structure of two or more teeth by cementum
Displacement of ameloblasts to root surface

12. What are the incremental lines for cementum and alveolar bone?
Extra cusp due to effects on enamel organ
Arrest and reversal lines
Dental papilla
Compressed layer of flat to cuboidal cells

13. What are the incremental lines for dentin?
Proliferation - differentiation - morphogenesis
Dens in dente - gemination - tubercle - and fusion
Compressed layer of flat to cuboidal cells
Imbrication lines of von Ebner

14. What is tubercle?
Union of 2 adjacent tooth germs
Extra cusp due to effects on enamel organ
Odontogenesis
Dental papilla

15. What is the main process involved in the bud stage?
Hereditary
Proliferation
Into odontoblasts
Enamel pearl - enamel dysplasia - and concresence

16. What happens during the maturation stage?
Common on permanent molars or cingulum of anterior teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental tissues secreted as matrix in successive layers.
Dental tissues fully mineralize to their mature levels.

17. What are the formative cells for dentin?
Odontoblasts
Cementoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Common with permanent maxillary molars

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

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19. What are the processes involved in the cap stage?
May be confused as calculus deposit on root
Proliferation - differentiation - morphogenesis
Traumatic injury or crowding of teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

20. What is the structure responsible for root development?
Lines of Retzuis
The dental lamina
The cervical loop
The outer enamel epithelium

21. What are the mature cells for enamel?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Extra cusp due to effects on enamel organ
Union of root structure of two or more teeth by cementum
There are none - they are lost with eruption

22. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
In the cap stage
Cementoid
6th to 7th weeks

23. What are the clinical ramifications of enamel dysplasia?
Cuboidal cells
The basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Epithelial

24. What are the clinical ramifications of concrescence?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementoid
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Common with permanent maxillary molars

25. What stage does supernumerary teeth occur?
6th to 7th weeks
Enamel organ invaginates into the dental papilla
Enamel organ
Initiation

26. The stratum intermediate is located inner or outer?
Extra cusp due to effects on enamel organ
Abnormally large teeth
The permanent molars
Inner

27. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
The ectomesenchyme - which was influenced by the neural crest cells
11th to 12th weeks
Osteoblasts

28. In the cap stage the tooth bud does not grow - what happens?
Enamel organ invaginates into the dental papilla
There is unequal growth in different parts of the tooth bud
Imbrication lines of von Ebner
The ectomesenchyme - which was influenced by the neural crest cells

29. What happens during initiation?
Dental tissues fully mineralize to their mature levels.
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
Hereditary
Local or systemic or hereditary

30. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
Common on permanent molars or cingulum of anterior teeth
Sphere of enamel on root
Odontoclasts

31. What is the predominate process in the bell stage?
Differentiation
Osteocytes
Apposition of the cementum
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

32. What are the clinical ramifications of enamel pearl?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementocytes
May be confused as calculus deposit on root
The ameloblasts place an acellular dental cuticle on the new enamel surface

33. What is another name for the dental sac?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary
The dental lamina
Dental follicle

34. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Enamel secreting cells (ameloblasts)
Cementoblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity

35. What is matrix?
Initiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The enamel organ is compressed
Imbrication lines of von Ebner

36. What are the etiological factors for micro/macrodontia?
Enamel organ
The ectomesenchyme - which was influenced by the neural crest cells
May be confused as calculus deposit on root
Hereditary in localized form. endocrine dysfunction is complete

37. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The tooth germ
May be confused as calculus deposit on root

38. Where does the primordium of the permanent dentition develop?
The actual vertical movement of the tooth
Inner
Differentiation - proliferation - morphogenesis
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

39. What is the embryological background for enamel?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
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.
Enamel organ
Hereditary in localized form. endocrine dysfunction is complete

40. Passive eruption
Abnormally large teeth
When the gingiva recedes and no actual tooth movement takes place
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

41. What will the outer cells of the dental lamina differentiate into?
Common on permanent molars or cingulum of anterior teeth
Dentin secreting cells (odontoblats)
The tooth germ
11th to 12th weeks

42. What are entrapped cementoblasts called?
Cementocytes
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The bud stage
The outer enamel epithelium

43. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Enamel secreting cells (ameloblasts)
The apposition of the enamel matrix
A bilayer rim that consists only IEE and OEE

44. What is dens in dente?
Enamel organ invaginates into the dental papilla
Induction
A bilayer rim that consists only IEE and OEE
Compressed layer of flat to cuboidal cells

45. 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 bud stage
Inner
There is unequal growth in different parts of the tooth bud

46. What happens during the bell stage?
Dental papilla
Extra cusp due to effects on enamel organ
Proliferation - differentiation - morphogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

47. What is the time span for initiation?
Odontogenesis
6th to 7th weeks
Induction - proliferation
Dental papilla

48. What happens during the cap stage?
4 types
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.
In the cap stage
As a result of the apposition of cementum over dentin

49. What kind of cells reside in the stratum intermediate?
6th to 7th weeks
Compressed layer of flat to cuboidal cells
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
There are none - they are lost with eruption

50. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Hereditary in localized form. endocrine dysfunction is complete
It disintegrates as the developing oral mucosa comes to line the oral cavity
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementoid

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Dentistry Tooth Development And Eruption

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