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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 fusion?
The tooth germ
Pressure on the area
Maturation
Common with permanent maxillary molars

2. What are the odontoblastic processes is contained in what?
Imbrication lines of von Ebner
The primordium of the pulp
Common on permanent molars or cingulum of anterior teeth
A mineralized cylinder - the dentinal tubule

3. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
A bilayer rim that consists only IEE and OEE
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Odontoblastic process

4. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The dental sac
The basement membrane
Cuboidal cells

5. What are the clinical ramifications of concrescence?
Oral epithelium
Faulty development of enamel from interference involving ameloblasts
Dental tissues fully mineralize to their mature levels.
Common with permanent maxillary molars

6. What are the formative cells for dentin?
Epithelial
Traumatic injury or crowding of teeth
Odontoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

7. What is microdontia?
Abnormally small teeth
Lines of Retzuis
Apposition of the cementum
Common with permanent maxillary molars

8. When does dens in dente occur?
During the cap stage
Commonly involves permanent maxillary lateral incisor and 3rd molars
Proliferation
Tall columnar cells

9. What are the mature cells for enamel?
The tooth germ
The basement membrane
There are none - they are lost with eruption
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

10. The stellate reticulum is located inner or outer?
Extra cusp due to effects on enamel organ
Sphere of enamel on root
Outer
It disintegrates as the developing oral mucosa comes to line the oral cavity

11. What are the mature cells for cementum?
Alveolar bone
Development of one or more extra teeth
Dental tissues secreted as matrix in successive layers.
Cementocytes

12. What is tubercle?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
8th week
The ameloblasts
Extra cusp due to effects on enamel organ

13. The oral epithelium is induced by the ectomesenchyme to produce what?
11th to 12th weeks
The dental lamina
In the cap stage
Tooth germ

14. Passive eruption
The enamel organ is compressed
When the gingiva recedes and no actual tooth movement takes place
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.
Trauma - pressure or metabolic disease

15. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
Pressure on the area
The basement membrane
8th week

16. What is the embryological background for dentin - cementum and alveolar bone?
Dentin and alveolar bone
Future dentin and pulp tissue
Dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

17. Tooth development
Odontogenesis
Bud stage
Odontoblasts
The enamel organ

18. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Tall columnar cells
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The enamel organ is compressed

19. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
4 types
The bud stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
In the cap stage

20. What is the function of the Hertwig's epithelial root sheath?
Proliferation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Compressed layer of flat to cuboidal cells
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

21. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
The apposition of the enamel matrix
Dentin secreting cells (odontoblats)
6th to 7th weeks

22. What processes are involved in the bell stage?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Differentiation - proliferation - morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dental follicle

23. What will the dental papilla eventually form?
Epithelial
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Inner
Future dentin and pulp tissue

24. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Displacement of ameloblasts to root surface
The dental sac
When the gingiva recedes and no actual tooth movement takes place
Maturation

25. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Traumatic injury or crowding of teeth
Proliferation - differentiation - morphogenesis
Epithelial

26. What hard tissue is innervated by nerves?
The dental sac
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dentin and alveolar bone
Ameloblasts

27. What happens when the reduced enamel epithelium is created?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Alveolar bone
Tooth germ tries to divide
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

28. 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
May be confused as calculus deposit on root
The ectoderm

29. What is another name for the dental sac?
Dentin and alveolar bone
Dental follicle
Union of 2 adjacent tooth germs
There is unequal growth in different parts of the tooth bud

30. What kind of cells occur in the outer enamel epithelium in the bell stage?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Trauma - pressure or metabolic disease
Cuboidal cells
The enamel organ is compressed

31. What hard tissue has vascularity?
Initiation stage
Alveolar bone
Trauma - pressure or metabolic disease
The cervical loop

32. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
A bilayer rim that consists only IEE and OEE
Traumatic injury or crowding of teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars

33. What is the predominate process in the bell stage?
Alveolar bone
Traumatic injury or crowding of teeth
Cementoblasts
Differentiation

34. The stratum intermediate is located inner or outer?
There is unequal growth in different parts of the tooth bud
Inner
The enamel organ
As a result of the apposition of cementum over dentin

35. What is macrodontia?
Epithelial
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
Abnormally large teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

36. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Proliferation - differentiation - morphogenesis
May be confused as calculus deposit on root
It disintegrates as the developing oral mucosa comes to line the oral cavity

37. What are the formative cells for alveolar bone?
Cementocytes
Dentin and alveolar bone
Sphere of enamel on root
Osteoblasts

38. What are the formative cells for cementum?
The tooth germ
Odontoclasts
The cementum - PDL - and alveolar bone
Cementoblasts

39. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Odontogenesis
Cementoblasts
The outer cells of the dental papilla and the central cells of the dental papilla
8th week

40. What happens during initiation?
Cementocytes
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Induction
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

41. Which layer in the bell stage has star shaped cells?
The stellate reticulum
When the gingiva recedes and no actual tooth movement takes place
Proliferation - differentiation - morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

42. What is anodontia?
Odontoblasts
Absence of single or multiple teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
During the cap stage

43. What are the etiological factors of enamel dysplasia?
Dens in dente - gemination - tubercle - and fusion
Union of 2 adjacent tooth germs
Local or systemic or hereditary
Odontoblasts

44. What is cementogenisis?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel pearl - enamel dysplasia - and concresence
Lines of Retzuis
Apposition of the cementum

45. What are the formative cells for enamel?
Ameloblasts
Future dentin and pulp tissue
Epithelial
Lines of Retzuis

46. What is the time span for the bell stage?
The enamel organ - dental papilla - dental sac
11th to 12th weeks
Cuboidal cells
The apposition of the enamel matrix

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

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48. What is the time span for initiation?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
6th to 7th weeks
Initiation
Proliferation - differentiation - morphogenesis

49. What are the clinical ramifications?
The enamel - dentin - and cementum are secreted in successive layers
Common on permanent molars or cingulum of anterior teeth
A mineralized cylinder - the dentinal tubule
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

50. What are the etiological factors for anodontia?
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 - endocrine dysfunction - systemic disease - excess radiation exposure
Traumatic injury or crowding of teeth
Future dentin and pulp tissue

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Dentistry Tooth Development And Eruption

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