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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. How many types of cells are found in the enamel organ in the bell stage?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
4 types
Tooth germ tries to divide
Dental tissues secreted as matrix in successive layers.

2. What are supernumerary teeth?
Development of one or more extra teeth
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.
Commonly involves permanent maxillary lateral incisor and 3rd molars
During the cap stage

3. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Cementocytes
Dental tissues fully mineralize to their mature levels.
The dental sac
Odontoblasts

4. What is anodontia?
8th week
The ameloblasts
Induction
Absence of single or multiple teeth

5. What is enamel dysplasia?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The permanent molars
Dental tissues fully mineralize to their mature levels.
Faulty development of enamel from interference involving ameloblasts

6. What is dens in dente?
Odontogenesis
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel organ invaginates into the dental papilla
Local or systemic or hereditary

7. What are the etiological factors for fusion?
The ectomesenchyme
11th to 12th weeks
It disintegrates as the developing oral mucosa comes to line the oral cavity
Pressure on the area

8. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
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
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary

9. What are entrapped cementoblasts called?
Dens in dente - gemination - tubercle - and fusion
Dental papilla
The basement membrane
Cementocytes

10. What are the formative cells for cementum?
Enamel organ invaginates into the dental papilla
A mineralized cylinder - the dentinal tubule
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.
Cementoblasts

11. What is the cap in the cap stage?
The enamel organ
Dental tissues fully mineralize to their mature levels.
Connective
The ectomesenchyme

12. The stratum intermediate is located inner or outer?
Tooth germ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Inner
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

13. What is another name for the dental sac?
The actual vertical movement of the tooth
The stellate reticulum
Dental follicle
Inner

14. What are the cell layers found in the enamel organ in the bell stage?
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
Hereditary
Faulty development of enamel from interference involving ameloblasts

15. What is the main process involved in initiation?
Trauma - pressure or metabolic disease
Osteocytes
Dental tissues secreted as matrix in successive layers.
Induction

16. What kind of cells occur in the inner enamel epithelium?
Dens in dente - gemination - tubercle - and fusion
Tall columnar cells
Trauma - pressure or metabolic disease
Proliferation - differentiation - morphogenesis

17. What will the outer cells of the dental lamina differentiate into?
Epithelial
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Arrest and reversal lines
Dentin secreting cells (odontoblats)

18. Which layer in the bell stage has star shaped 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.
The tooth germ
Commonly involves permanent maxillary lateral incisor and 3rd molars
The stellate reticulum

19. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Maturation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
When the gingiva recedes and no actual tooth movement takes place

20. What are the clinical ramifications of concrescence?
The bud stage
A mineralized cylinder - the dentinal tubule
Dental follicle
Common with permanent maxillary molars

21. What processes are involved with the apposition stage?
Induction - proliferation
The dental lamina
Dental tissues fully mineralize to their mature levels.
The ameloblasts

22. What are the etiological factors for enamel pearl?
Compressed layer of flat to cuboidal cells
8th week
Maturation
Displacement of ameloblasts to root surface

23. What hard tissue is innervated by nerves?
Proliferation
Dentin and alveolar bone
Dental tissues secreted as matrix in successive layers.
May be confused as calculus deposit on root

24. What kind of cells reside in the stratum intermediate?
The enamel organ - dental papilla - dental sac
Compressed layer of flat to cuboidal cells
Cementoid
Osteocytes

25. What are the etiological factors for anodontia?
Absence of single or multiple teeth
Compressed layer of flat to cuboidal cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontoblastic process

26. What hard tissue has vascularity?
Alveolar bone
Differentiation - proliferation - morphogenesis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental sac

27. What happens during initiation?
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
Enamel
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane

28. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The cervical loop
Osteoblasts
The basement membrane

29. What are the etiological factors for dens in dente and gemination?
The basement membrane
Hereditary
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The outer enamel epithelium

30. The oral epithelium is induced by the ectomesenchyme to produce what?
Tooth germ
Alveolar bone
The dental lamina
Dental papilla

31. When does macro/microdontia occur?
Differentiation
Bud stage
Enamel secreting cells (ameloblasts)
Trauma - pressure or metabolic disease

32. What are the mature cells for cementum?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Cementocytes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Enamel

33. What are the etiological factors of enamel dysplasia?
In the cap stage
Hereditary
Local or systemic or hereditary
Sphere of enamel on root

34. What are the mature cells for enamel?
There are none - they are lost with eruption
The stellate reticulum
The ectomesenchyme
Extra cusp due to effects on enamel organ

35. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Extra cusp due to effects on enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Induction - proliferation
9th to 10th weeks

36. What stage does supernumerary teeth occur?
Dental tissues secreted as matrix in successive layers.
Dens in dente - gemination - tubercle - and fusion
A bilayer rim that consists only IEE and OEE
Initiation

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

38. What is the structure responsible for root development?
Enamel organ
Epithelial rests of Malassez
The cervical loop
Enamel organ invaginates into the dental papilla

39. What are the etiological factors for supernumerary teeth?
The dental sac
Odontoblastic process
Hereditary
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

40. What are the clinical ramifications of enamel pearl?
Common with permanent maxillary molars
May be confused as calculus deposit on root
Arrest and reversal lines
A bilayer rim that consists only IEE and OEE

41. What stage does anodontia occur?
Displacement of ameloblasts to root surface
Initiation stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The outer enamel epithelium

42. Which teeth are nonsuccedaneous?
The permanent molars
Osteoblasts
Hereditary
Abnormally small teeth

43. What is fusion?
Hereditary in localized form. endocrine dysfunction is complete
Union of 2 adjacent tooth germs
6th to 7th weeks
The actual vertical movement of the tooth

44. What is the cementum matrix called?
Cementoid
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Oral epithelium
4 types

45. Where is the dental papilla originally derived from?
Hereditary
Ameloblasts
The ectomesenchyme - which was influenced by the neural crest cells
Maturation

46. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Union of root structure of two or more teeth by cementum
Dental papilla
The ectoderm

47. What is concrescence?
Union of root structure of two or more teeth by cementum
Initiation stage
The enamel - dentin - and cementum are secreted in successive layers
Common with permanent maxillary molars

48. What are the clinical ramifications of gemination?

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49. When does dens in dente occur?
The enamel organ is compressed
During the cap stage
Osteoblasts
Enamel organ

50. What do the odontoblasts do?
The apposition of the enamel matrix
Extra cusp due to effects on enamel organ
Imbrication lines of von Ebner
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

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Dentistry Tooth Development And Eruption

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