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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 the time span for the cap stage?
9th to 10th weeks
Into odontoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Apposition of the cementum

2. What is the time span for the bell stage?
The enamel organ is compressed
The cementum - PDL - and alveolar bone
Differentiation - proliferation - morphogenesis
11th to 12th weeks

3. When does the tooth bud become a tooth germ?
In the cap stage
Inner
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

4. What will the inner cells of the dental lamina differentiates into?
The ectomesenchyme - which was influenced by the neural crest cells
Odontoblasts
The primordium of the pulp
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

5. What is the embryological background for enamel?
Enamel organ
May be confused as calculus deposit on root
Development of one or more extra teeth
Abnormally large teeth

6. What are the incremental lines for dentin?
Union of 2 adjacent tooth germs
11th to 12th weeks
Tooth germ
Imbrication lines of von Ebner

7. What is the primordium of the tooth?
Development of one or more extra teeth
The tooth germ
The basement membrane
Union of root structure of two or more teeth by cementum

8. What are the clinical ramifications of enamel pearl?
The outer cells of the dental papilla and the central cells of the dental papilla
May be confused as calculus deposit on root
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
9th to 10th weeks

9. What is macrodontia?
The enamel organ is compressed
Proliferation - differentiation - morphogenesis
11th to 12th weeks
Abnormally large teeth

10. What do the odontoblasts do?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Pressure on the area
Osteoblasts

11. What are the formative cells for cementum?
Induction
Faulty development of enamel from interference involving ameloblasts
Cementoblasts
Pressure on the area

12. In the cap stage the tooth bud does not grow - what happens?
11th to 12th weeks
The outer enamel epithelium
There is unequal growth in different parts of the tooth bud
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.

13. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Inner
Induction
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
It disintegrates as the developing oral mucosa comes to line the oral cavity

14. Where is the enamal organ originally derived from?
The ectoderm
Dental tissues secreted as matrix in successive layers.
Cementocytes
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

15. What are the mature cells for cementum?
Cementocytes
The basement membrane
Odontoblasts
Dens in dente - gemination - tubercle - and fusion

16. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The cervical loop
Epithelial rests of Malassez
The basement membrane
The actual vertical movement of the tooth

17. What are the etiological factors for dens in dente and gemination?
Hereditary
The dental sac
The outer enamel epithelium
Sphere of enamel on root

18. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Connective
Outer
The primordium of the pulp

19. The stratum intermediate is located inner or outer?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Inner
The ameloblasts place an acellular dental cuticle on the new enamel surface

20. Active eruption
Maturation
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
Cementocytes
The actual vertical movement of the tooth

21. What is the predominate process in the bell stage?
8th week
Differentiation
Lines of Retzuis
Outer

22. When does macro/microdontia occur?
Cuboidal cells
Dens in dente - gemination - tubercle - and fusion
Tooth germ
Bud stage

23. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
The dental sac
Hereditary
Trauma - pressure or metabolic disease

24. What stage does the dental tissues subsequently fully mineralize
The ectomesenchyme
Maturation
Dens in dente - gemination - tubercle - and fusion
9th to 10th weeks

25. What are the formative cells for dentin?
Hereditary
Common with permanent maxillary molars
Odontoblasts
8th week

26. Where is the enamel matrix secreted from by the ameloblasts?

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27. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Only dentinal tubules with processes
Development of one or more extra teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

28. What hard tissue has vascularity?
The dental sac
The enamel organ - dental papilla - dental sac
The dental lamina
Alveolar bone

29. The oral epithelium is induced by the ectomesenchyme to produce what?
Preameloblasts
Traumatic injury or crowding of teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The dental lamina

30. Where is the dental sac originally derived from?
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
Common on permanent molars or cingulum of anterior teeth
Odontoclasts

31. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Cementoid
The dental sac
Abnormally small teeth
Bud stage

32. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Morphogenesis
The outer enamel epithelium
Common on permanent molars or cingulum of anterior teeth
The ameloblasts

33. What are the mature cells for enamel?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
There are none - they are lost with eruption
Enamel secreting cells (ameloblasts)
May be confused as calculus deposit on root

34. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Ameloblasts
Proliferation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

35. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
The outer enamel epithelium
The ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

36. What are the developmental disturbances of the cap stage?
Preameloblasts
Dens in dente - gemination - tubercle - and fusion
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
It disintegrates as the developing oral mucosa comes to line the oral cavity

37. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Odontoblastic process
Induction
Cementocytes

38. Which teeth are nonsuccedaneous?
The permanent molars
The enamel organ is compressed
Odontoblastic process
Cementoblasts

39. What kind of cells occur in the outer enamel epithelium in the bell stage?
Epithelial rests of Malassez
Cuboidal cells
The ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

40. What is an enamel pearl?
The ameloblasts
When the gingiva recedes and no actual tooth movement takes place
Sphere of enamel on root
Local or systemic or hereditary

41. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Maturation
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel organ
Common on permanent molars or cingulum of anterior teeth

42. What is the cementum matrix called?
Initiation
The basement membrane
Cementoid
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

43. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The primordium of the pulp
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontoblasts
Bud stage

44. What are the formative cells for enamel?
Arrest and reversal lines
Displacement of ameloblasts to root surface
Ameloblasts
The dental sac

45. What layer serves as protection for the enamel organ?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel pearl - enamel dysplasia - and concresence
Cementoblasts
The outer enamel epithelium

46. What kind of cells reside in the stratum intermediate?
6th to 7th weeks
Compressed layer of flat to cuboidal cells
Cementoblasts
Abnormally small teeth

47. What is the main process involved in the bud stage?
Dentin secreting cells (odontoblats)
Proliferation
8th week
Proliferation - differentiation - morphogenesis

48. What are the clinical ramifications?
Dental tissues secreted as matrix in successive layers.
Compressed layer of flat to cuboidal cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Common on permanent molars or cingulum of anterior teeth

49. What does the cervical loop consist of?
The outer enamel epithelium
Odontoblasts
A bilayer rim that consists only IEE and OEE
Absence of single or multiple teeth

50. What is the time span for the bud stage?
8th week
Abnormally large teeth
Morphogenesis
Dentin secreting cells (odontoblats)