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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 wll the inner enamel epithelium differentiate into?
The ectoderm
The outer cells of the dental papilla and the central cells of the dental papilla
Enamel secreting cells (ameloblasts)
Induction - proliferation

2. What kind of cells reside in the stratum intermediate?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ameloblasts
Dens in dente - gemination - tubercle - and fusion
Compressed layer of flat to cuboidal cells

3. Tooth development
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
4 types
The outer cells of the dental papilla and the central cells of the dental papilla
Odontogenesis

4. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Abnormally small teeth
The enamel organ - dental papilla - dental sac
Hereditary in localized form. endocrine dysfunction is complete
Dental papilla

5. What is the main process involved in initiation?
The ectomesenchyme
Induction
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 dental lamina

6. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ameloblasts place an acellular dental cuticle on the new enamel surface
The enamel - dentin - and cementum are secreted in successive layers
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.

7. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Enamel pearl - enamel dysplasia - and concresence
The ectomesenchyme
Outer

8. What are the etiological factors for anodontia?
Absence of single or multiple teeth
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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
The ameloblasts place an acellular dental cuticle on the new enamel surface

9. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Epithelial rests of Malassez
11th to 12th weeks

10. What are the odontoblastic processes is contained in what?
Induction - proliferation
Only dentinal tubules with processes
The dental sac
A mineralized cylinder - the dentinal tubule

11. The oral epithelium is induced by the ectomesenchyme to produce what?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The dental lamina
Trauma - pressure or metabolic disease
Local or systemic or hereditary

12. What are the clinical ramifications of concrescence?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Common with permanent maxillary molars
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Tooth germ

13. What are the etiological factors of tubercle?
The dental sac
Cementoblasts
Into odontoblasts
Trauma - pressure or metabolic disease

14. What are the etiological factors for supernumerary teeth?
When the gingiva recedes and no actual tooth movement takes place
Epithelial
Dental papilla
Hereditary

15. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Bud stage
Tooth germ
Enamel pearl - enamel dysplasia - and concresence

16. What is the primordium of the tooth?
Union of 2 adjacent tooth germs
The tooth germ
Cementoid
Abnormally large teeth

17. What is concrescence?
Dens in dente - gemination - tubercle - and fusion
Hereditary
Future dentin and pulp tissue
Union of root structure of two or more teeth by cementum

18. What is the cementum matrix called?
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
Cementoid
The enamel organ is compressed
Inner

19. What are the formative cells for alveolar bone?
Union of 2 adjacent tooth germs
Osteoblasts
8th week
The cementum - PDL - and alveolar bone

20. What is the structure responsible for root development?
The cervical loop
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Lines of Retzuis
Enamel

21. What is the embryological background for enamel?
The cervical loop
The ectomesenchyme - which was influenced by the neural crest cells
Only dentinal tubules with processes
Enamel organ

22. What is macrodontia?
A mineralized cylinder - the dentinal tubule
Abnormally large teeth
9th to 10th weeks
Odontoclasts

23. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Preameloblasts
The dental lamina
Cementocytes
The basement membrane

24. What are the incremental lines for cementum and alveolar bone?
The dental sac
Arrest and reversal lines
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
May be confused as calculus deposit on root

25. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane
The dental lamina
Dental tissues fully mineralize to their mature levels.

26. What will the dental papilla eventually form?
Future dentin and pulp tissue
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
Odontogenesis
Tall columnar cells

27. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Proliferation - differentiation - morphogenesis
The dental sac
The outer cells of the dental papilla and the central cells of the dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

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

29. What are the mature cells for enamel?
Dens in dente - gemination - tubercle - and fusion
There are none - they are lost with eruption
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
May be confused as calculus deposit on root

30. How is the reduced enamel epithelium created?
Abnormally small teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ is compressed
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

31. What are the developmental disturbances of the cap stage?
Apposition of the cementum
Dens in dente - gemination - tubercle - and fusion
Enamel organ
The permanent molars

32. What are the incremental lines for dentin?
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
Imbrication lines of von Ebner
Local or systemic or hereditary
Absence of single or multiple teeth

33. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
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 enamel organ is compressed
Odontoblastic process

34. What else undergoes proliferation in the bud stage besides the dental lamina?
Odontogenesis
Cementocytes
The ectomesenchyme
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

35. The stellate reticulum is located inner or outer?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Outer
When the gingiva recedes and no actual tooth movement takes place

36. What is the time span for the cap stage?
Proliferation
The enamel organ is compressed
Epithelial
9th to 10th weeks

37. What are the etiological factors of concrescence?
Oral epithelium
There are none - they are lost with eruption
Extra cusp due to effects on enamel organ
Traumatic injury or crowding of teeth

38. What are the formative cells for enamel?
Lines of Retzuis
Ameloblasts
Induction - proliferation
Traumatic injury or crowding of teeth

39. What type of tissue is dentin - cementum - and alveolar bone?
Preameloblasts
Connective
Epithelial
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

40. What are the incremental lines for enamel?
Lines of Retzuis
The tooth germ
Only dentinal tubules with processes
Maturation

41. What happens during the maturation stage?
Hereditary in localized form. endocrine dysfunction is complete
Local or systemic or hereditary
Dental tissues fully mineralize to their mature levels.
The enamel - dentin - and cementum are secreted in successive layers

42. When does the process of root development take place?
Displacement of ameloblasts to root surface
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Ameloblasts
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.

43. What is another name for the dental sac?
Dental follicle
The ectomesenchyme
During the cap stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

44. How is the dentinocemental junction formed?
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.
As a result of the apposition of cementum over dentin
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
The dental sac

45. What are the etiological factors for dens in dente and gemination?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ameloblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Hereditary

46. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Dens in dente - gemination - tubercle - and fusion
Apposition of the cementum
The dental sac

47. When does the tooth bud become a tooth germ?
In the cap stage
The ameloblasts place an acellular dental cuticle on the new enamel surface
The apposition of the enamel matrix
Dens in dente - gemination - tubercle - and fusion

48. The stratum intermediate is located inner or outer?
Epithelial rests of Malassez
Inner
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Tooth germ tries to divide

49. What is the predominate process in the bell stage?
Differentiation
Initiation stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The cervical loop

50. What type of tissue is enamel?
Epithelial
Union of 2 adjacent tooth germs
Induction - proliferation
The outer cells of the dental papilla and the central cells of the dental papilla