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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. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
There are none - they are lost with eruption
Proliferation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

2. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Cuboidal cells
9th to 10th weeks
Odontoclasts
Extra cusp due to effects on enamel organ

3. The stellate reticulum is located inner or outer?
Outer
The enamel organ
Inner
Dental follicle

4. What happens when the reduced enamel epithelium is created?
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 actual vertical movement of the tooth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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

5. What will the outer cells of the dental lamina differentiate into?
The primordium of the pulp
Dentin secreting cells (odontoblats)
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Pressure on the area

6. The oral epithelium is induced by the ectomesenchyme to produce what?
The basement membrane
Oral epithelium
The dental lamina
Ameloblasts

7. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Epithelial rests of Malassez
The permanent molars
Dental papilla
Cementoblasts

8. What type of tissue is dentin - cementum - and alveolar bone?
Trauma - pressure or metabolic disease
Connective
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Initiation stage

9. What is amelogenisis?
Osteocytes
The apposition of the enamel matrix
Tall columnar cells
The outer cells of the dental papilla and the central cells of the dental papilla

10. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
The outer cells of the dental papilla and the central cells of the dental papilla
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.
Ameloblasts

11. What is enamel dysplasia?
The ectomesenchyme
The ectoderm
Faulty development of enamel from interference involving ameloblasts
Proliferation - differentiation - morphogenesis

12. What will the dental papilla eventually form?
Differentiation
Dentin secreting cells (odontoblats)
Future dentin and pulp tissue
Tall columnar cells

13. What happens during the apposition stage?
Preameloblasts
The dental sac
Dental tissues secreted as matrix in successive layers.
Imbrication lines of von Ebner

14. What is the site for the future dentioenamel junction?
Displacement of ameloblasts to root surface
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Absence of single or multiple teeth
The basement membrane that seperates the enamel organ and dental papilla

15. What are the mature cells for enamel?
The enamel organ - dental papilla - dental sac
There are none - they are lost with eruption
9th to 10th weeks
Pressure on the area

16. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The enamel organ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dental papilla
Sphere of enamel on root

17. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ectomesenchyme
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Maturation

18. What is anodontia?
Absence of single or multiple teeth
Epithelial
There are none - they are lost with eruption
Dental tissues secreted as matrix in successive layers.

19. What hard tissue is can not have tissue formation after eruption?
Enamel
Oral epithelium
Absence of single or multiple teeth
When the gingiva recedes and no actual tooth movement takes place

20. Where is the enamal organ originally derived from?
The ectoderm
The basement membrane
Proliferation
The basement membrane

21. What are the clinical ramifications of concrescence?
Tall columnar cells
Dentin secreting cells (odontoblats)
Union of root structure of two or more teeth by cementum
Common with permanent maxillary molars

22. Where does the primordium of the permanent dentition develop?
The cervical loop
Cementoblasts
4 types
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

23. Do odontoblasts start their secretion of matrix before the ameloblasts?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental follicle
Ameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

24. What are the incremental lines for enamel?
The enamel organ is compressed
Lines of Retzuis
During the cap stage
The tooth germ

25. What is concrescence?
Dens in dente - gemination - tubercle - and fusion
Morphogenesis
Union of root structure of two or more teeth by cementum
Osteoblasts

26. Active eruption
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Epithelial
The actual vertical movement of the tooth
Proliferation

27. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Odontoclasts
The enamel organ
The basement membrane
Dentin secreting cells (odontoblats)

28. What type of tissue is enamel?
Epithelial
Oral epithelium
Enamel organ
Dental follicle

29. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
As a result of the apposition of cementum over dentin
Differentiation
Outer

30. What is the predominate process of the cap stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
11th to 12th weeks
Morphogenesis
Tooth germ

31. When does dens in dente occur?
During the cap stage
Tall columnar cells
Enamel organ
Enamel pearl - enamel dysplasia - and concresence

32. What are the etiological factors of enamel dysplasia?
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
Local or systemic or hereditary
Displacement of ameloblasts to root surface
Osteoblasts

33. What is the time span for the cap stage?
9th to 10th weeks
Cuboidal cells
The apposition of the enamel matrix
Hereditary in localized form. endocrine dysfunction is complete

34. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Bud stage
Pressure on the area

35. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ectoderm
Trauma - pressure or metabolic disease

36. What is fusion?
The outer cells of the dental papilla and the central cells of the dental papilla
Union of 2 adjacent tooth germs
The bud stage
11th to 12th weeks

37. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Dental papilla
Maturation
The ameloblasts
Dentin and alveolar bone

38. The stratum intermediate is located inner or outer?
Inner
Initiation
Dental follicle
Odontogenesis

39. What are the etiological factors for dens in dente and gemination?
The ectomesenchyme
Hereditary
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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

40. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectomesenchyme - which was influenced by the neural crest cells
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

41. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ameloblasts place an acellular dental cuticle on the new enamel surface
The ectomesenchyme
8th week

42. What is the time span for the bud stage?
Induction - proliferation
8th week
Osteocytes
Odontoblastic process

43. What is the embryological background for enamel?
Development of one or more extra teeth
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
The basement membrane

44. What kind of cells occur in the outer enamel epithelium in the bell stage?
11th to 12th weeks
Cuboidal cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoblastic process

45. What are the mature cells for alveolar bone?
The enamel organ - dental papilla - dental sac
Differentiation - proliferation - morphogenesis
Osteocytes
Pressure on the area

46. What is tubercle?
8th week
Differentiation
Extra cusp due to effects on enamel organ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

47. What are the etiological factors for fusion?
Dens in dente - gemination - tubercle - and fusion
Enamel organ invaginates into the dental papilla
Pressure on the area
Inner

48. Which teeth are nonsuccedaneous?
The ectomesenchyme
The permanent molars
It disintegrates as the developing oral mucosa comes to line the oral cavity
Union of root structure of two or more teeth by cementum

49. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Induction
Enamel
Cementoblasts

50. Passive eruption
Cementoid
Cementoblasts
Induction
When the gingiva recedes and no actual tooth movement takes place