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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 is tubercle?
Extra cusp due to effects on enamel organ
Common on permanent molars or cingulum of anterior teeth
Ameloblasts
Enamel

2. What are the clinical ramifications of concrescence?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Common with permanent maxillary molars
Enamel organ
Tooth germ tries to divide

3. When does dens in dente occur?
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.
Tall columnar cells
Enamel organ invaginates into the dental papilla
During the cap stage

4. What are supernumerary teeth?
Development of one or more extra teeth
Enamel pearl - enamel dysplasia - and concresence
Imbrication lines of von Ebner
The bud stage

5. What is the cap in the cap stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
A bilayer rim that consists only IEE and OEE
The enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

6. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Pressure on the area
Ameloblasts
Osteoblasts

7. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Lines of Retzuis
Dental tissues fully mineralize to their mature levels.
Abnormally large teeth
The basement membrane

8. What kind of cells occur in the inner enamel epithelium?
Future dentin and pulp tissue
Common with permanent maxillary molars
The ectomesenchyme
Tall columnar cells

9. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity
The primordium of the pulp
The cementum - PDL - and alveolar bone

10. What is the embryological background for dentin - cementum and alveolar bone?
Connective
Into odontoblasts
Dental papilla
Enamel organ

11. What is the primordium of the tooth?
The tooth germ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane
Dentin and alveolar bone

12. What is the time span for the bud stage?
Dentin secreting cells (odontoblats)
Preameloblasts
Outer
8th week

13. What kind of cells reside in the stratum intermediate?
Traumatic injury or crowding of teeth
Compressed layer of flat to cuboidal cells
9th to 10th weeks
Abnormally large teeth

14. What are the mature cells for alveolar bone?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Osteocytes
Differentiation
Displacement of ameloblasts to root surface

15. 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
Displacement of ameloblasts to root surface
The outer cells of the dental papilla and the central cells of the dental papilla
Tall columnar cells

16. What processes are involved in the bell stage?
A bilayer rim that consists only IEE and OEE
Trauma - pressure or metabolic disease
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Differentiation - proliferation - morphogenesis

17. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Apposition of the cementum

18. What are the mature cells for enamel?
Union of 2 adjacent tooth germs
Enamel
8th week
There are none - they are lost with eruption

19. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
The enamel organ - dental papilla - dental sac
The outer cells of the dental papilla and the central cells of the dental papilla
Common on permanent molars or cingulum of anterior teeth

20. What are the clinical ramifications of fusion?
Dental tissues secreted as matrix in successive layers.
Initiation stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Common on permanent molars or cingulum of anterior teeth

21. What is the cementum matrix called?
The actual vertical movement of the tooth
Cementoid
The tooth germ
8th week

22. What are the major components of the tooth germ?
Enamel
Odontoclasts
The enamel organ - dental papilla - dental sac
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

23. What are the formative cells for enamel?
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
Cementoblasts
Compressed layer of flat to cuboidal cells
Ameloblasts

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

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25. What is macrodontia?
Abnormally large teeth
Dentin secreting cells (odontoblats)
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

26. The stellate reticulum is located inner or outer?
The actual vertical movement of the tooth
Extra cusp due to effects on enamel organ
Hereditary
Outer

27. What is the main process involved in the bud stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Proliferation
Tooth germ
Initiation

28. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Inner
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
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
Maturation

29. What is an enamel pearl?
Absence of single or multiple teeth
Sphere of enamel on root
The cervical loop
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

30. What will the dental sac give rise to?
The outer enamel epithelium
The cementum - PDL - and alveolar bone
The cervical loop
Traumatic injury or crowding of teeth

31. What are the clinical ramifications of gemination?

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32. What is the predominate process of the cap stage?
Odontoblasts
Morphogenesis
When the gingiva recedes and no actual tooth movement takes place
Osteocytes

33. What are the clinical ramifications of anodontia?
Bud stage
Dental papilla
In the cap stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

34. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Enamel organ invaginates into the dental papilla
Initiation
Proliferation - differentiation - morphogenesis
The outer cells of the dental papilla and the central cells of the dental papilla

35. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Compressed layer of flat to cuboidal cells
Imbrication lines of von Ebner
Induction - proliferation

36. What are the etiological factors for enamel pearl?
The basement membrane
The permanent molars
Displacement of ameloblasts to root surface
Union of 2 adjacent tooth germs

37. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Enamel organ
Compressed layer of flat to cuboidal cells
The dental sac
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

38. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane
Tooth germ
The permanent molars

39. What is the predominate process in the bell stage?
Initiation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Faulty development of enamel from interference involving ameloblasts
Differentiation

40. What is gemination?
Tooth germ tries to divide
Differentiation
Cementoid
Faulty development of enamel from interference involving ameloblasts

41. Which teeth are nonsuccedaneous?
The permanent molars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Future dentin and pulp tissue
Inner

42. What stage does the dental tissues subsequently fully mineralize
Cementocytes
Abnormally large teeth
Maturation
4 types

43. What is fusion?
Union of 2 adjacent tooth germs
Dental follicle
Local or systemic or hereditary
The basement membrane

44. What is matrix?
Morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Alveolar bone
During the cap stage

45. What do the odontoblasts do?
Cementocytes
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
Tooth germ tries to divide

46. What is the time span for the cap stage?
9th to 10th weeks
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ectoderm
Hereditary in localized form. endocrine dysfunction is complete

47. What are the formative cells for alveolar bone?
Absence of single or multiple teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental papilla
Osteoblasts

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

49. What is the structure responsible for root development?
Trauma - pressure or metabolic disease
The enamel organ - dental papilla - dental sac
The ectoderm
The cervical loop

50. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The basement membrane that seperates the enamel organ and dental papilla
The dental lamina
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

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Dentistry Tooth Development And Eruption

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