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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is dens in dente?
Hereditary
The basement membrane
Enamel organ invaginates into the dental papilla
Dental papilla

2. What are the etiological factors of enamel dysplasia?
Proliferation - differentiation - morphogenesis
Common on permanent molars or cingulum of anterior teeth
Local or systemic or hereditary
Bud stage

3. What are the incremental lines for enamel?
A bilayer rim that consists only IEE and OEE
The stellate reticulum
Common on permanent molars or cingulum of anterior teeth
Lines of Retzuis

4. What will the dental sac give rise to?
Ameloblasts
May be confused as calculus deposit on root
The actual vertical movement of the tooth
The cementum - PDL - and alveolar bone

5. Where is the dental sac originally derived from?
The ectomesenchyme
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Traumatic injury or crowding of teeth
Hereditary

6. What are the clinical ramifications of fusion?
Inner
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Tooth germ tries to divide

7. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
The dental sac
Traumatic injury or crowding of teeth
4 types

8. What are the clinical ramifications of supernumerary teeth?
Initiation stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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 of enamel organ into bell with four cell types and dental papilla into two cell types.

9. What are the formative cells for enamel?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Ameloblasts
Into odontoblasts
Hereditary

10. When does macro/microdontia occur?
Induction - proliferation
Bud stage
Odontoblastic process
The stellate reticulum

11. What is the primordium of the tooth?
The tooth germ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The primordium of the pulp
The ectoderm

12. What is the main process involved in the bud stage?
Proliferation
The dental lamina
Enamel
Alveolar bone

13. What is the time span for initiation?
A bilayer rim that consists only IEE and OEE
The ameloblasts place an acellular dental cuticle on the new enamel surface
6th to 7th weeks
Initiation

14. What type of tissue is dentin - cementum - and alveolar bone?
Connective
The outer enamel epithelium
Union of 2 adjacent tooth germs
Epithelial rests of Malassez

15. What is concrescence?
Dentin secreting cells (odontoblats)
The primordium of the pulp
The cervical loop
Union of root structure of two or more teeth by cementum

16. What stage does the dental tissues subsequently fully mineralize
Lines of Retzuis
Maturation
The primordium of the pulp
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

17. Do odontoblasts start their secretion of matrix before the ameloblasts?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Future dentin and pulp tissue
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

18. Where is the dental papilla originally derived from?
Alveolar bone
Dental tissues secreted as matrix in successive layers.
The ectomesenchyme - which was influenced by the neural crest cells
The dental sac

19. What is the predominate process in the bell stage?
Differentiation
Differentiation - proliferation - morphogenesis
Proliferation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

20. What processes are involved with the apposition stage?
Odontoclasts
Union of root structure of two or more teeth by cementum
Induction - proliferation
Dental papilla

21. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Faulty development of enamel from interference involving ameloblasts
The dental sac
The outer enamel epithelium

22. What are the etiological factors for enamel pearl?
Commonly involves permanent maxillary lateral incisor and 3rd molars
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
Displacement of ameloblasts to root surface
The basement membrane

23. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
The enamel organ - dental papilla - dental sac
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Preameloblasts

24. Passive eruption
There is unequal growth in different parts of the tooth bud
When the gingiva recedes and no actual tooth movement takes place
Dental papilla
Induction - proliferation

25. What is enamel dysplasia?
The enamel organ is compressed
The basement membrane
Faulty development of enamel from interference involving ameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

26. What is macrodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ectomesenchyme - which was influenced by the neural crest cells
Sphere of enamel on root
Abnormally large teeth

27. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
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
Differentiation - proliferation - morphogenesis
The ameloblasts
Odontoblastic process

28. What stage does anodontia occur?
Initiation stage
The ameloblasts place an acellular dental cuticle on the new enamel surface
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

29. What are the mature cells for cementum?
Oral epithelium
The bud stage
Cementocytes
Tooth germ tries to divide

30. In the cap stage the tooth bud does not grow - what happens?
Tooth germ tries to divide
The dental sac
There is unequal growth in different parts of the tooth bud
Maturation

31. What is the main process involved in initiation?
Imbrication lines of von Ebner
The ectomesenchyme
Faulty development of enamel from interference involving ameloblasts
Induction

32. What are supernumerary teeth?
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
Displacement of ameloblasts to root surface
Development of one or more extra teeth
The basement membrane that seperates the enamel organ and dental papilla

33. What is the structure responsible for root development?
The cervical loop
The cementum - PDL - and alveolar bone
9th to 10th weeks
Bud stage

34. The stratum intermediate is located inner or outer?
As a result of the apposition of cementum over dentin
Inner
Enamel
Sphere of enamel on root

35. Tooth development
Initiation
As a result of the apposition of cementum over dentin
Odontogenesis
Hereditary

36. Where does the primordium of the permanent dentition develop?
Outer
In the cap stage
Enamel
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

37. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Differentiation
Epithelial
The enamel - dentin - and cementum are secreted in successive layers

38. What are the incremental lines for dentin?
8th week
Cementoblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
Imbrication lines of von Ebner

39. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The ectomesenchyme
Enamel organ invaginates into the dental papilla
8th week
The bud stage

40. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
9th to 10th weeks
Dentin secreting cells (odontoblats)
Tooth germ
Into odontoblasts

41. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Into odontoblasts
There is unequal growth in different parts of the tooth bud

42. What are the etiological factors for anodontia?
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
Initiation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontogenesis

43. What is the embryological background for enamel?
Enamel organ
The bud stage
Apposition of the cementum
Only dentinal tubules with processes

44. When does the tooth bud become a tooth germ?
Dental tissues fully mineralize to their mature levels.
In the cap stage
Extra cusp due to effects on enamel organ
Dental follicle

45. What happens during the cap stage?
There are none - they are lost with eruption
Into odontoblasts
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.
9th to 10th weeks

46. What are the etiological factors of tubercle?
Ameloblasts
Epithelial
6th to 7th weeks
Trauma - pressure or metabolic disease

47. What hard tissue is can not have tissue formation after eruption?
Enamel
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 basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity

48. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The ectomesenchyme - which was influenced by the neural crest cells
The dental sac
The ectomesenchyme
Dental tissues secreted as matrix in successive layers.

49. What wll the inner enamel epithelium differentiate into?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Enamel pearl - enamel dysplasia - and concresence
Extra cusp due to effects on enamel organ
Enamel secreting cells (ameloblasts)

50. What is tubercle?
Connective
Extra cusp due to effects on enamel organ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The cementum - PDL - and alveolar bone