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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 are the major components of the tooth germ?
Preameloblasts
A mineralized cylinder - the dentinal tubule
The enamel organ - dental papilla - dental sac
Proliferation - differentiation - morphogenesis

2. What is the structure responsible for root development?
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
The cervical loop
The enamel organ - dental papilla - dental sac
The ameloblasts

3. What are the mature cells for enamel?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Common on permanent molars or cingulum of anterior teeth
There are none - they are lost with eruption
Sphere of enamel on root

4. What is an enamel pearl?
Displacement of ameloblasts to root surface
Sphere of enamel on root
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

5. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
11th to 12th weeks
9th to 10th weeks
During the cap stage
The ameloblasts

6. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Osteoblasts
Preameloblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Absence of single or multiple teeth

7. What are the etiological factors of tubercle?
11th to 12th weeks
Common with permanent maxillary molars
Trauma - pressure or metabolic disease
Bud stage

8. The stellate reticulum is located inner or outer?
Initiation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Outer
The ameloblasts

9. What are the clinical ramifications of supernumerary teeth?
May be confused as calculus deposit on root
Enamel pearl - enamel dysplasia - and concresence
Enamel organ
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

10. What hard tissue is innervated by nerves?
A mineralized cylinder - the dentinal tubule
The cementum - PDL - and alveolar bone
Union of 2 adjacent tooth germs
Dentin and alveolar bone

11. What are the clinical ramifications of anodontia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
There are none - they are lost with eruption
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Odontoblastic process

12. What are the incremental lines for dentin?
Hereditary
Imbrication lines of von Ebner
Development of one or more extra teeth
Extra cusp due to effects on enamel organ

13. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Epithelial rests of Malassez
11th to 12th weeks
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.

14. What are the clinical ramifications of enamel dysplasia?
In the cap stage
Tooth germ tries to divide
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Alveolar bone

15. What type of tissue is dentin - cementum - and alveolar bone?
6th to 7th weeks
Connective
The ectomesenchyme
Hereditary

16. What are the etiological factors of concrescence?
The enamel organ is compressed
Traumatic injury or crowding of teeth
Dental tissues fully mineralize to their mature levels.
Osteoblasts

17. What will the outer cells of the dental lamina differentiate into?
Alveolar bone
Differentiation
Dentin secreting cells (odontoblats)
Connective

18. What happens during the maturation stage?
Odontoblastic process
Tall columnar cells
Cementoblasts
Dental tissues fully mineralize to their mature levels.

19. What are the etiological factors for supernumerary teeth?
Odontoblasts
Hereditary
The enamel organ
Initiation stage

20. What else undergoes proliferation in the bud stage besides the dental lamina?
Cementocytes
The ectomesenchyme
Proliferation - differentiation - morphogenesis
Preameloblasts

21. What does the cervical loop consist of?
Inner
Odontoclasts
The apposition of the enamel matrix
A bilayer rim that consists only IEE and OEE

22. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Epithelial
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Osteocytes

23. What is amelogenisis?
Oral epithelium
The apposition of the enamel matrix
Enamel organ invaginates into the dental papilla
Dental tissues fully mineralize to their mature levels.

24. Passive eruption
Hereditary
Dental tissues fully mineralize to their mature levels.
The enamel organ is compressed
When the gingiva recedes and no actual tooth movement takes place

25. What are the mature cells for alveolar bone?
Differentiation - proliferation - morphogenesis
Osteocytes
The basement membrane
8th week

26. What is the primordium of the tooth?
Enamel organ
The tooth germ
Lines of Retzuis
The basement membrane

27. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Tall columnar cells
Connective
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

28. What are supernumerary teeth?
Cementoblasts
The outer enamel epithelium
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Development of one or more extra teeth

29. Where is the dental sac originally derived from?
Maturation
Dental tissues secreted as matrix in successive layers.
The basement membrane
The ectomesenchyme

30. What are the etiological factors of enamel dysplasia?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Local or systemic or hereditary
8th week
The enamel - dentin - and cementum are secreted in successive layers

31. What happens when the reduced enamel epithelium is created?
The outer cells of the dental papilla and the central cells of the dental papilla
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
Dental tissues fully mineralize to their mature levels.
Dens in dente - gemination - tubercle - and fusion

32. What is dens in dente?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel organ invaginates into the dental papilla
Dentin and alveolar bone
Proliferation

33. What are the formative cells for enamel?
Ameloblasts
Morphogenesis
Imbrication lines of von Ebner
The dental sac

34. What is the embryological background for dentin - cementum and alveolar bone?
Only dentinal tubules with processes
Dental papilla
The tooth germ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

35. What hard tissue is can not have tissue formation after eruption?
Enamel
Abnormally large teeth
Extra cusp due to effects on enamel organ
The cervical loop

36. What is anodontia?
As a result of the apposition of cementum over dentin
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Absence of single or multiple teeth
Epithelial rests of Malassez

37. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
The outer cells of the dental papilla and the central cells of the dental papilla
Tall columnar cells
Connective

38. What are the incremental lines for cementum and alveolar bone?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Arrest and reversal lines
Induction - proliferation
Odontoblasts

39. What is tubercle?
Faulty development of enamel from interference involving ameloblasts
Cementocytes
Extra cusp due to effects on enamel organ
As a result of the apposition of cementum over dentin

40. What stage does supernumerary teeth occur?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The cementum - PDL - and alveolar bone
Initiation
The basement membrane that seperates the enamel organ and dental papilla

41. Where does the primordium of the permanent dentition develop?
Displacement of ameloblasts to root surface
Dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Arrest and reversal lines

42. What stage does anodontia occur?
Initiation stage
6th to 7th weeks
Lines of Retzuis
A bilayer rim that consists only IEE and OEE

43. 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
Cementoblasts
Enamel secreting cells (ameloblasts)
The cervical loop

44. What are the development disturbances of the apposition and maturation stages?
The enamel organ
A mineralized cylinder - the dentinal tubule
Abnormally small teeth
Enamel pearl - enamel dysplasia - and concresence

45. What is enamel dysplasia?
The dental lamina
Local or systemic or hereditary
Displacement of ameloblasts to root surface
Faulty development of enamel from interference involving ameloblasts

46. What are the etiological factors for enamel pearl?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Displacement of ameloblasts to root surface
Traumatic injury or crowding of teeth
Union of 2 adjacent tooth germs

47. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Dental tissues fully mineralize to their mature levels.
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Enamel secreting cells (ameloblasts)

48. What are the mature cells for dentin?
Inner
As a result of the apposition of cementum over dentin
The tooth germ
Only dentinal tubules with processes

49. What is the predominate process in the bell stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Differentiation
Common with permanent maxillary molars
Sphere of enamel on root

50. What hard tissue has vascularity?
Enamel pearl - enamel dysplasia - and concresence
Alveolar bone
In the cap stage
There are none - they are lost with eruption