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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 of concrescence?
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
Connective
Traumatic injury or crowding of teeth
Alveolar bone

2. What happens during the bell stage?
Differentiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
During the cap stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

3. How many types of cells are found in the enamel organ in the bell stage?
Dentin secreting cells (odontoblats)
Epithelial
Tooth germ tries to divide
4 types

4. What stage does anodontia occur?
Initiation stage
Ameloblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel pearl - enamel dysplasia - and concresence

5. What are the mature cells for alveolar bone?
Osteocytes
The primordium of the pulp
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Proliferation - differentiation - morphogenesis

6. What layer serves as protection for the enamel organ?
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
Odontoblastic process
Connective
The outer enamel epithelium

7. Passive eruption
The cementum - PDL - and alveolar bone
When the gingiva recedes and no actual tooth movement takes place
Compressed layer of flat to cuboidal cells
The outer enamel epithelium

8. What are the clinical ramifications of gemination?

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9. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementoblasts
Outer

10. What is the predominate process in the bell stage?
8th week
Differentiation
Dental papilla
Enamel

11. What are the etiological factors for dens in dente and gemination?
Osteocytes
Hereditary
Pressure on the area
Compressed layer of flat to cuboidal cells

12. Where is the enamal organ originally derived from?
The basement membrane that seperates the enamel organ and dental papilla
4 types
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectoderm

13. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Dental tissues fully mineralize to their mature levels.
Differentiation - proliferation - morphogenesis
The cementum - PDL - and alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

14. What does the cervical loop consist of?
Compressed layer of flat to cuboidal cells
4 types
A bilayer rim that consists only IEE and OEE
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

15. What are the odontoblastic processes is contained in what?
May be confused as calculus deposit on root
Enamel secreting cells (ameloblasts)
A mineralized cylinder - the dentinal tubule
Epithelial

16. In the cap stage the tooth bud does not grow - what happens?
Future dentin and pulp tissue
There is unequal growth in different parts of the tooth bud
Enamel secreting cells (ameloblasts)
In the cap stage

17. What will the outer cells of the dental lamina differentiate into?
Cementoblasts
Epithelial
Dentin secreting cells (odontoblats)
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

18. What is fusion?
Union of 2 adjacent tooth germs
A mineralized cylinder - the dentinal tubule
Dental tissues fully mineralize to their mature levels.
Absence of single or multiple teeth

19. What is the process involved in the maturation stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ is compressed
Maturation
Epithelial rests of Malassez

20. What is the structure responsible for root development?
Enamel pearl - enamel dysplasia - and concresence
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop
Future dentin and pulp tissue

21. What is the function of the Hertwig's epithelial root sheath?
Union of root structure of two or more teeth by cementum
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Maturation

22. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Tall columnar cells
The dental sac
Differentiation
The ectomesenchyme

23. 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
Oral epithelium
The ameloblasts place an acellular dental cuticle on the new enamel surface
Alveolar bone

24. What is the predominate process of the cap stage?
Dens in dente - gemination - tubercle - and fusion
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
A mineralized cylinder - the dentinal tubule
Morphogenesis

25. What is anodontia?
Alveolar bone
The basement membrane
Absence of single or multiple teeth
Odontogenesis

26. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Initiation stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ameloblasts
The cementum - PDL - and alveolar bone

27. What is the main process involved in initiation?
Induction
The ectomesenchyme - which was influenced by the neural crest cells
The ameloblasts
Dens in dente - gemination - tubercle - and fusion

28. What is concrescence?
The cementum - PDL - and alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Union of root structure of two or more teeth by cementum
Tooth germ tries to divide

29. What is the main process involved in the bud stage?
Osteocytes
Trauma - pressure or metabolic disease
A mineralized cylinder - the dentinal tubule
Proliferation

30. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
The ameloblasts
Oral epithelium
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

31. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
It disintegrates as the developing oral mucosa comes to line the oral cavity

32. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Development of one or more extra teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
9th to 10th weeks

33. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Alveolar bone
Tooth germ
The enamel organ is compressed
11th to 12th weeks

34. What is the embryological background for dentin - cementum and alveolar bone?
Dentin and alveolar bone
A bilayer rim that consists only IEE and OEE
The outer enamel epithelium
Dental papilla

35. What is the cap in the cap stage?
Dens in dente - gemination - tubercle - and fusion
Proliferation - differentiation - morphogenesis
The enamel organ
Union of 2 adjacent tooth germs

36. What will the dental sac give rise to?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Trauma - pressure or metabolic disease
Induction
The cementum - PDL - and alveolar bone

37. What are the formative cells for dentin?
Maturation
As a result of the apposition of cementum over dentin
Enamel organ invaginates into the dental papilla
Odontoblasts

38. What are the formative cells for alveolar bone?
Osteoblasts
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
Common with permanent maxillary molars
The actual vertical movement of the tooth

39. What is an enamel pearl?
Sphere of enamel on root
Odontoblastic process
Differentiation - proliferation - morphogenesis
Dental tissues fully mineralize to their mature levels.

40. What hard tissue is can not have tissue formation after eruption?
Enamel
Initiation stage
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
The enamel organ

41. What happens during the cap stage?
Odontogenesis
Cuboidal cells
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.
Local or systemic or hereditary

42. What is the time span for the bell stage?
11th to 12th weeks
Cementoblasts
Dentin and alveolar bone
Dental tissues secreted as matrix in successive layers.

43. What will the dental papilla eventually form?
The enamel organ - dental papilla - dental sac
Future dentin and pulp tissue
11th to 12th weeks
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

44. Active eruption
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The actual vertical movement of the tooth
A bilayer rim that consists only IEE and OEE
The stellate reticulum

45. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Pressure on the area
There is unequal growth in different parts of the tooth bud

46. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Future dentin and pulp tissue
The enamel organ - dental papilla - dental sac
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

47. What kind of cells occur in the outer enamel epithelium in the bell stage?
Odontoblastic process
Cuboidal cells
Arrest and reversal lines
Dental tissues secreted as matrix in successive layers.

48. What processes are involved with the apposition stage?
Induction - proliferation
Bud stage
Absence of single or multiple teeth
Cementocytes

49. What are the processes involved in the cap stage?
The ectomesenchyme
Differentiation
Proliferation - differentiation - morphogenesis
Union of 2 adjacent tooth germs

50. 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
Common with permanent maxillary molars
A bilayer rim that consists only IEE and OEE
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

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Dentistry Tooth Development And Eruption

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