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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 mature cells for cementum?
Compressed layer of flat to cuboidal cells
In the cap stage
Dens in dente - gemination - tubercle - and fusion
Cementocytes

2. What are the developmental disturbances of the cap stage?
The ameloblasts
Dens in dente - gemination - tubercle - and fusion
Dentin and alveolar bone
Proliferation

3. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The bud stage
The cervical loop
The basement membrane
Differentiation - proliferation - morphogenesis

4. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The enamel - dentin - and cementum are secreted in successive layers
Lines of Retzuis
Hereditary

5. What is concrescence?
Cementoid
Enamel organ invaginates into the dental papilla
Traumatic injury or crowding of teeth
Union of root structure of two or more teeth by cementum

6. When does the process of root development take place?
Cementocytes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Tooth germ tries to divide
Bud stage

7. What are the incremental lines for dentin?
Arrest and reversal lines
Imbrication lines of von Ebner
Alveolar bone
Common with permanent maxillary molars

8. What is the main process involved in the bud stage?
Outer
8th week
Proliferation
The cementum - PDL - and alveolar bone

9. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Union of 2 adjacent tooth germs
Apposition of the cementum
It disintegrates as the developing oral mucosa comes to line the oral cavity

10. What are entrapped cementoblasts called?
Cementocytes
A mineralized cylinder - the dentinal tubule
The tooth germ
Preameloblasts

11. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Hereditary
Epithelial
The basement membrane

12. What is fusion?
Union of 2 adjacent tooth germs
Hereditary
Odontoclasts
8th week

13. Active eruption
Dental follicle
The actual vertical movement of the tooth
Connective
Compressed layer of flat to cuboidal cells

14. When does macro/microdontia occur?
Bud stage
The outer enamel epithelium
Absence of single or multiple teeth
Enamel pearl - enamel dysplasia - and concresence

15. Where is the dental sac originally derived from?
The ectomesenchyme
Proliferation - differentiation - morphogenesis
Cementoid
The apposition of the enamel matrix

16. What are the formative cells for cementum?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The stellate reticulum
Cementoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

17. What are the etiological factors for dens in dente and gemination?
Odontoblasts
Faulty development of enamel from interference involving ameloblasts
A mineralized cylinder - the dentinal tubule
Hereditary

18. What are the odontoblastic processes is contained in what?
The permanent molars
The outer cells of the dental papilla and the central cells of the dental papilla
A mineralized cylinder - the dentinal tubule
Dens in dente - gemination - tubercle - and fusion

19. What are the clinical ramifications of supernumerary teeth?
The basement membrane
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Sphere of enamel on root
The actual vertical movement of the tooth

20. What hard tissue has vascularity?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ameloblasts place an acellular dental cuticle on the new enamel surface
6th to 7th weeks
Alveolar bone

21. What happens when the reduced enamel epithelium is created?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Absence of single or multiple teeth
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
Hereditary in localized form. endocrine dysfunction is complete

22. What type of tissue is enamel?
Osteoblasts
Tall columnar cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Epithelial

23. The stellate reticulum is located inner or outer?
The dental sac
Outer
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Initiation

24. What are the mature cells for enamel?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Only dentinal tubules with processes
There are none - they are lost with eruption
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

25. What are the processes involved in the cap stage?
Faulty development of enamel from interference involving ameloblasts
Proliferation - differentiation - morphogenesis
Initiation
Alveolar bone

26. What is macrodontia?
Abnormally large teeth
Union of root structure of two or more teeth by cementum
Ameloblasts
Enamel

27. When does dens in dente occur?
During the cap stage
Preameloblasts
Cuboidal cells
Enamel organ

28. What are succedaneous teeth?
The outer enamel epithelium
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Maturation

29. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Lines of Retzuis
The bud stage
The enamel organ is compressed
The ameloblasts

30. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dentin secreting cells (odontoblats)
The basement membrane
Common with permanent maxillary molars

31. What are the clinical ramifications of gemination?

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32. What else undergoes proliferation in the bud stage besides the dental lamina?
The apposition of the enamel matrix
The ectomesenchyme
Differentiation - proliferation - morphogenesis
Cementoblasts

33. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
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
Bud stage
The ectomesenchyme - which was influenced by the neural crest cells

34. What is the outer portion of the ectoderm in the initiation stage?
The outer cells of the dental papilla and the central cells of the dental papilla
Oral epithelium
Odontoclasts
The primordium of the pulp

35. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
The cementum - PDL - and alveolar bone
Local or systemic or hereditary
Common on permanent molars or cingulum of anterior teeth

36. What are the mature cells for alveolar bone?
Cementocytes
Osteocytes
The enamel organ
Future dentin and pulp tissue

37. What is amelogenisis?
The apposition of the enamel matrix
Common on permanent molars or cingulum of anterior teeth
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Union of root structure of two or more teeth by cementum

38. What are the etiological factors of concrescence?
Apposition of the cementum
Sphere of enamel on root
Epithelial rests of Malassez
Traumatic injury or crowding of teeth

39. What is the time span for the bell stage?
11th to 12th weeks
Displacement of ameloblasts to root surface
The cementum - PDL - and alveolar bone
Cementoblasts

40. What is cementogenisis?
Apposition of the cementum
Enamel organ
Traumatic injury or crowding of teeth
The bud stage

41. What processes are involved with the apposition stage?
Induction - proliferation
Enamel secreting cells (ameloblasts)
Cementocytes
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.

42. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Cementoblasts
The enamel organ
The enamel - dentin - and cementum are secreted in successive layers

43. Where is the enamal organ originally derived from?
The ectoderm
Tooth germ
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
Future dentin and pulp tissue

44. The stratum intermediate is located inner or outer?
The enamel - dentin - and cementum are secreted in successive layers
11th to 12th weeks
Inner
The enamel organ

45. What is the primordium of the tooth?
Differentiation
The outer cells of the dental papilla and the central cells of the dental papilla
The permanent molars
The tooth germ

46. What kind of cells reside in the stratum intermediate?
Enamel pearl - enamel dysplasia - and concresence
Lines of Retzuis
Enamel secreting cells (ameloblasts)
Compressed layer of flat to cuboidal cells

47. What is anodontia?
The enamel organ - dental papilla - dental sac
Absence of single or multiple teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental tissues fully mineralize to their mature levels.

48. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
The enamel - dentin - and cementum are secreted in successive layers
Enamel secreting cells (ameloblasts)
Abnormally small teeth

49. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dens in dente - gemination - tubercle - and fusion
Odontoblastic process
Connective
Differentiation

50. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Inner
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.
4 types

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Dentistry Tooth Development And Eruption

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