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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 bud stage?
Alveolar bone
Traumatic injury or crowding of teeth
Oral epithelium
8th week

2. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
There is unequal growth in different parts of the tooth bud
Proliferation
Enamel organ

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
Absence of single or multiple teeth
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
As a result of the apposition of cementum over dentin

4. What is dens in dente?
Epithelial
Enamel organ invaginates into the dental papilla
Enamel secreting cells (ameloblasts)
Connective

5. What are the clinical ramifications of fusion?
Into odontoblasts
Dental tissues secreted as matrix in successive layers.
Osteoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

6. What is the predominate process in the bell stage?
Differentiation
In the cap stage
The primordium of the pulp
Epithelial

7. What is amelogenisis?
The actual vertical movement of the tooth
The apposition of the enamel matrix
Differentiation - proliferation - morphogenesis
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

8. What layer serves as protection for the enamel organ?
There are none - they are lost with eruption
The outer enamel epithelium
The basement membrane
Proliferation

9. 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
Abnormally small teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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 are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Tooth germ
Dental papilla
The enamel organ is compressed

11. What are the developmental disturbances of the cap stage?
Proliferation - differentiation - morphogenesis
Osteoblasts
Dental tissues fully mineralize to their mature levels.
Dens in dente - gemination - tubercle - and fusion

12. What is the cementum matrix called?
Osteocytes
The stellate reticulum
Into odontoblasts
Cementoid

13. What is tubercle?
Extra cusp due to effects on enamel organ
The enamel - dentin - and cementum are secreted in successive layers
A mineralized cylinder - the dentinal tubule
Enamel organ

14. What are the processes involved in the cap stage?
Enamel organ invaginates into the dental papilla
Odontoblastic process
Alveolar bone
Proliferation - differentiation - morphogenesis

15. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Alveolar bone
Cementocytes
Epithelial rests of Malassez
Odontogenesis

16. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The basement membrane that seperates the enamel organ and dental papilla
Cementocytes
Odontoclasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

17. What are the mature cells for dentin?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Initiation stage
Pressure on the area
Only dentinal tubules with processes

18. What is the embryological background for enamel?
Enamel organ
Epithelial
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The apposition of the enamel matrix

19. The stellate reticulum is located inner or outer?
Common with permanent maxillary molars
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tall columnar cells
Outer

20. Where does the primordium of the permanent dentition develop?
Odontoblastic process
Proliferation
The ectomesenchyme
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

21. What are the mature cells for cementum?
Cementocytes
Arrest and reversal lines
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

22. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The primordium of the pulp
Outer
Union of 2 adjacent tooth germs
Tooth germ

23. What will the dental papilla eventually form?
Odontoblasts
Future dentin and pulp tissue
Local or systemic or hereditary
Dental follicle

24. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
A mineralized cylinder - the dentinal tubule
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
May be confused as calculus deposit on root

25. What are the mature cells for enamel?
Lines of Retzuis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
There are none - they are lost with eruption
May be confused as calculus deposit on root

26. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Lines of Retzuis
The enamel - dentin - and cementum are secreted in successive layers
Compressed layer of flat to cuboidal cells

27. What are the clinical ramifications of enamel pearl?
Cementocytes
The basement membrane that seperates the enamel organ and dental papilla
The ectomesenchyme
May be confused as calculus deposit on root

28. What happens when the reduced enamel epithelium is created?
Hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
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
Enamel organ invaginates into the dental papilla

29. What do the odontoblasts do?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Hereditary in localized form. endocrine dysfunction is complete
The enamel organ is compressed
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

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

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31. What is the main process involved in initiation?
The ectomesenchyme
Odontogenesis
Induction
Odontoclasts

32. What are the incremental lines for cementum and alveolar bone?
The ameloblasts
There are none - they are lost with eruption
Arrest and reversal lines
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

33. Active eruption
Odontogenesis
Compressed layer of flat to cuboidal cells
The actual vertical movement of the tooth
Odontoblasts

34. What happens during the apposition 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
Dental papilla
Cuboidal cells
Dental tissues secreted as matrix in successive layers.

35. What hard tissue is innervated by nerves?
As a result of the apposition of cementum over dentin
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectoderm
Dentin and alveolar bone

36. What are the clinical ramifications of concrescence?
Odontoclasts
There is unequal growth in different parts of the tooth bud
Connective
Common with permanent maxillary molars

37. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Enamel
The dental sac
The basement membrane
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

38. How is the dentinocemental junction formed?
The outer cells of the dental papilla and the central cells of the dental papilla
As a result of the apposition of cementum over dentin
Development of one or more extra teeth
Bud stage

39. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Enamel organ invaginates into the dental papilla
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

40. What happens during the cap stage?
May be confused as calculus deposit on root
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.
Pressure on the area
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

41. What are the etiological factors of enamel dysplasia?
Only dentinal tubules with processes
During the cap stage
Local or systemic or hereditary
The dental lamina

42. Where is the dental papilla originally derived from?
The enamel organ
The ectomesenchyme - which was influenced by the neural crest cells
Cementocytes
Compressed layer of flat to cuboidal cells

43. How is the reduced enamel epithelium created?
The enamel organ is compressed
Extra cusp due to effects on enamel organ
Odontoclasts
Differentiation - proliferation - morphogenesis

44. What stage does supernumerary teeth occur?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
It disintegrates as the developing oral mucosa comes to line the oral cavity
Initiation
Morphogenesis

45. What stage does the dental tissues subsequently fully mineralize
Maturation
Lines of Retzuis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementoblasts

46. What are the mature cells for alveolar bone?
Sphere of enamel on root
Osteocytes
Connective
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.

47. What does the cervical loop consist of?
Abnormally small teeth
Dentin secreting cells (odontoblats)
A bilayer rim that consists only IEE and OEE
Morphogenesis

48. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Sphere of enamel on root
Cementoid
Only dentinal tubules with processes

49. In the cap stage the tooth bud does not grow - what happens?
The permanent molars
The primordium of the pulp
Osteocytes
There is unequal growth in different parts of the tooth bud

50. Which layer in the bell stage has star shaped cells?
Absence of single or multiple teeth
The stellate reticulum
There is unequal growth in different parts of the tooth bud
The cervical loop