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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 will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Ameloblasts
Lines of Retzuis
As a result of the apposition of cementum over dentin

2. What is tubercle?
Enamel organ
The permanent molars
Extra cusp due to effects on enamel organ
Inner

3. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Inner
The outer cells of the dental papilla and the central cells of the dental papilla
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

4. What happens during the bell stage?
Odontoblasts
The enamel organ
Maturation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

5. When does the tooth bud become a tooth germ?
Union of root structure of two or more teeth by cementum
The dental sac
Dental papilla
In the cap stage

6. What is the time span for the bell stage?
Only dentinal tubules with processes
11th to 12th weeks
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
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

7. What are the formative cells for dentin?
Odontoblasts
Abnormally small teeth
Development of one or more extra teeth
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.

8. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Common with permanent maxillary molars
Alveolar bone
The permanent molars
The ameloblasts place an acellular dental cuticle on the new enamel surface

9. What happens during the bud stage?
Dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The tooth germ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

10. What is fusion?
Union of 2 adjacent tooth germs
Into odontoblasts
Dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

11. What are the mature cells for enamel?
There are none - they are lost with eruption
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Faulty development of enamel from interference involving ameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

12. What is the site for the future dentioenamel junction?
The tooth germ
The basement membrane that seperates the enamel organ and dental papilla
Dental tissues fully mineralize to their mature levels.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

13. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Dentin and alveolar bone
The enamel organ is compressed
In the cap stage

14. What are the etiological factors of enamel dysplasia?
May be confused as calculus deposit on root
Epithelial
Local or systemic or hereditary
The basement membrane

15. The oral epithelium is induced by the ectomesenchyme to produce what?
The ameloblasts
There are none - they are lost with eruption
The dental lamina
Odontoblasts

16. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Induction
As a result of the apposition of cementum over dentin

17. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Displacement of ameloblasts to root surface
Maturation
Into odontoblasts

18. What is dens in dente?
Dental papilla
Dental papilla
Enamel organ invaginates into the dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

19. Where does the primordium of the permanent dentition develop?
The apposition of the enamel matrix
Common with permanent maxillary molars
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental follicle

20. When does dens in dente occur?
11th to 12th weeks
Alveolar bone
During the cap stage
Cementoblasts

21. How is the reduced enamel epithelium created?
The enamel organ is compressed
Osteoblasts
The ameloblasts
Trauma - pressure or metabolic disease

22. What is the predominate process in the bell stage?
Union of root structure of two or more teeth by cementum
Differentiation
Only dentinal tubules with processes
The cementum - PDL - and alveolar bone

23. What is enamel dysplasia?
Odontoclasts
Traumatic injury or crowding of teeth
Dental papilla
Faulty development of enamel from interference involving ameloblasts

24. What are the etiological factors for fusion?
Pressure on the area
Trauma - pressure or metabolic disease
Osteoblasts
Into odontoblasts

25. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Union of 2 adjacent tooth germs

26. What are the mature cells for cementum?
Cementocytes
Absence of single or multiple teeth
Dental papilla
Osteoblasts

27. What are the incremental lines for dentin?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Imbrication lines of von Ebner
The ameloblasts
Cementoblasts

28. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Tall columnar cells
Apposition of the cementum
Differentiation
The dental sac

29. What hard tissue is can not have tissue formation after eruption?
Enamel secreting cells (ameloblasts)
Dental follicle
Enamel
Alveolar bone

30. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane
Cementoblasts

31. What stage does anodontia occur?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Initiation stage
Ameloblasts
Hereditary

32. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
The actual vertical movement of the tooth
8th week
Cementocytes

33. What are the etiological factors for dens in dente and gemination?
Hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
During the cap stage
Cuboidal cells

34. What happens during the cap stage?
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.
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel secreting cells (ameloblasts)

35. What are the clinical ramifications of enamel pearl?
Compressed layer of flat to cuboidal cells
May be confused as calculus deposit on root
Cementoblasts
Bud stage

36. The preameloblasts induce dental papilla cells to differentiate into what?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Common with permanent maxillary molars
Into odontoblasts
The enamel organ

37. What are the etiological factors for micro/macrodontia?
Faulty development of enamel from interference involving ameloblasts
Dental papilla
Maturation
Hereditary in localized form. endocrine dysfunction is complete

38. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Local or systemic or hereditary
Pressure on the area
Sphere of enamel on root
Epithelial rests of Malassez

39. The stratum intermediate is located inner or outer?
11th to 12th weeks
Inner
The ectoderm
Induction

40. What is cementogenisis?
Cementoid
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Apposition of the cementum
Traumatic injury or crowding of teeth

41. What is the time span for the cap stage?
There are none - they are lost with eruption
Dental follicle
The basement membrane
9th to 10th weeks

42. What type of tissue is dentin - cementum - and alveolar bone?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Imbrication lines of von Ebner
Connective
Alveolar bone

43. What will the dental sac give rise to?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Initiation stage
The cementum - PDL - and alveolar bone
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

44. What kind of cells occur in the inner enamel epithelium?
The basement membrane
Outer
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Tall columnar cells

45. What is matrix?
Connective
Traumatic injury or crowding of teeth
Epithelial rests of Malassez
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

46. What wll the inner enamel epithelium differentiate into?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Only dentinal tubules with processes
The actual vertical movement of the tooth
Enamel secreting cells (ameloblasts)

47. Which teeth are nonsuccedaneous?
Pressure on the area
The permanent molars
Extra cusp due to effects on enamel organ
The basement membrane

48. What hard tissue has vascularity?
Alveolar bone
Odontoclasts
Common on permanent molars or cingulum of anterior teeth
Proliferation - differentiation - morphogenesis

49. What are the mature cells for dentin?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Only dentinal tubules with processes
6th to 7th weeks
Enamel organ invaginates into the dental papilla

50. What is the process involved in the maturation stage?
The ectomesenchyme
The permanent molars
Maturation
May be confused as calculus deposit on root