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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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1. Which layer in the bell stage has star shaped cells?
Maturation
Enamel secreting cells (ameloblasts)
The stellate reticulum
Epithelial

2. What do the odontoblasts do?
Hereditary in localized form. endocrine dysfunction is complete
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
A mineralized cylinder - the dentinal tubule
Inner

3. What is the time span for the cap stage?
Imbrication lines of von Ebner
9th to 10th weeks
The ectomesenchyme - which was influenced by the neural crest cells
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

4. What is the embryological background for dentin - cementum and alveolar bone?
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
Dental papilla
Common with permanent maxillary molars
9th to 10th weeks

5. What is tubercle?
Displacement of ameloblasts to root surface
Extra cusp due to effects on enamel organ
Tooth germ tries to divide
Enamel organ invaginates into the dental papilla

6. What hard tissue is innervated by nerves?
Proliferation
Dentin and alveolar bone
Differentiation - proliferation - morphogenesis
Extra cusp due to effects on enamel organ

7. What are succedaneous teeth?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane that seperates the enamel organ and dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

8. What stage does supernumerary teeth occur?
Initiation
The stellate reticulum
Inner
Cementocytes

9. What is dens in dente?
Odontoclasts
Enamel pearl - enamel dysplasia - and concresence
Enamel organ invaginates into the dental papilla
Tall columnar cells

10. What is the time span for the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
11th to 12th weeks
Apposition of the cementum
Hereditary

11. What else undergoes proliferation in the bud stage besides the dental lamina?
Odontoblasts
The ectomesenchyme
The enamel - dentin - and cementum are secreted in successive layers
Proliferation - differentiation - morphogenesis

12. What is the time span for initiation?
Tooth germ tries to divide
6th to 7th weeks
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

13. What are the etiological factors for supernumerary teeth?
When the gingiva recedes and no actual tooth movement takes place
Hereditary
Enamel
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

14. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Trauma - pressure or metabolic disease
Only dentinal tubules with processes
The dental sac
Arrest and reversal lines

15. The stratum intermediate is located inner or outer?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Inner
Local or systemic or hereditary
Enamel

16. The preameloblasts induce dental papilla cells to differentiate into what?
Lines of Retzuis
Cementocytes
Proliferation - differentiation - morphogenesis
Into odontoblasts

17. What are the clinical ramifications of anodontia?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Tooth germ tries to divide
8th week
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

18. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
A bilayer rim that consists only IEE and OEE
There are none - they are lost with eruption
Cementoblasts
There is unequal growth in different parts of the tooth bud

19. What is the primordium of the tooth?
Extra cusp due to effects on enamel organ
The tooth germ
The ectomesenchyme
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

20. What will the dental papilla eventually form?
Dental tissues fully mineralize to their mature levels.
Future dentin and pulp tissue
The outer cells of the dental papilla and the central cells of the dental papilla
Abnormally large teeth

21. What are the formative cells for alveolar bone?
The cementum - PDL - and alveolar bone
Abnormally small teeth
Abnormally large teeth
Osteoblasts

22. What are the etiological factors for fusion?
6th to 7th weeks
Pressure on the area
The dental sac
Enamel secreting cells (ameloblasts)

23. Active eruption
The ameloblasts
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
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

24. What are the developmental disturbances of the cap stage?
Traumatic injury or crowding of teeth
Epithelial rests of Malassez
Dens in dente - gemination - tubercle - and fusion
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

25. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel organ
Preameloblasts
The ectomesenchyme
Cementocytes

26. What are the incremental lines for enamel?
Cementoid
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Lines of Retzuis
Into odontoblasts

27. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Apposition of the cementum
Compressed layer of flat to cuboidal cells
Union of root structure of two or more teeth by cementum
The ameloblasts

28. What is the predominate process in the bell stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Odontoblastic process
Differentiation
Tall columnar cells

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

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30. When does dens in dente occur?
The permanent molars
During the cap stage
8th week
Faulty development of enamel from interference involving ameloblasts

31. What are the etiological factors of concrescence?
Abnormally large teeth
Hereditary
Traumatic injury or crowding of teeth
Cuboidal cells

32. What is the cap in the cap stage?
Enamel organ
The enamel organ
Hereditary
During the cap stage

33. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
The bud stage
Dental follicle
Differentiation

34. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Compressed layer of flat to cuboidal cells
Dens in dente - gemination - tubercle - and fusion
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

35. What is the main process involved in the bud stage?
Proliferation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dental tissues secreted as matrix in successive layers.
Preameloblasts

36. Tooth development
Odontogenesis
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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
A mineralized cylinder - the dentinal tubule

37. What are entrapped cementoblasts called?
Cementocytes
9th to 10th weeks
The actual vertical movement of the tooth
Abnormally large teeth

38. What is concrescence?
Outer
Union of root structure of two or more teeth by cementum
It disintegrates as the developing oral mucosa comes to line the oral cavity
Alveolar bone

39. What will the dental sac give rise to?
In the cap stage
The cementum - PDL - and alveolar bone
Connective
Abnormally small teeth

40. What is another name for the dental sac?
Dens in dente - gemination - tubercle - and fusion
Dental follicle
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 outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

41. What are the etiological factors of tubercle?
Hereditary in localized form. endocrine dysfunction is complete
The ectoderm
The actual vertical movement of the tooth
Trauma - pressure or metabolic disease

42. What are the clinical ramifications of dens in dente?
Lines of Retzuis
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Differentiation - proliferation - morphogenesis
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

43. The oral epithelium is induced by the ectomesenchyme to produce what?
Oral epithelium
The cervical loop
Hereditary
The dental lamina

44. What happens during the maturation stage?
When the gingiva recedes and no actual tooth movement takes place
Dental tissues fully mineralize to their mature levels.
Hereditary in localized form. endocrine dysfunction is complete
Dental papilla

45. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Absence of single or multiple teeth
Oral epithelium
Hereditary

46. What is anodontia?
Absence of single or multiple teeth
Tooth germ tries to divide
The enamel organ - dental papilla - dental sac
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

47. What are the clinical ramifications of concrescence?
There are none - they are lost with eruption
Common with permanent maxillary molars
Dental papilla
The basement membrane

48. What happens during initiation?
Enamel pearl - enamel dysplasia - and concresence
The ectomesenchyme
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
Cementoblasts

49. What is the embryological background for enamel?
Local or systemic or hereditary
Enamel organ
Dentin secreting cells (odontoblats)
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

50. What are the clinical ramifications of enamel pearl?
Proliferation
Enamel pearl - enamel dysplasia - and concresence
May be confused as calculus deposit on root
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