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

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2. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The dental lamina
When the gingiva recedes and no actual tooth movement takes place
Dens in dente - gemination - tubercle - and fusion
The outer cells of the dental papilla and the central cells of the dental papilla

3. What is the predominate process of the cap stage?
Sphere of enamel on root
Initiation
4 types
Morphogenesis

4. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Connective
Union of 2 adjacent tooth germs
The outer cells of the dental papilla and the central cells of the dental papilla
Cementoblasts

5. Where is the dental papilla originally derived from?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectomesenchyme - which was influenced by the neural crest cells
The basement membrane
There are none - they are lost with eruption

6. Passive eruption
Odontoclasts
When the gingiva recedes and no actual tooth movement takes place
The bud stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

7. What is amelogenisis?
Common on permanent molars or cingulum of anterior teeth
The dental sac
The apposition of the enamel matrix
Local or systemic or hereditary

8. What are the clinical ramifications of dens in dente?
Cementocytes
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
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Induction

9. What hard tissue is can not have tissue formation after eruption?
Imbrication lines of von Ebner
The ectomesenchyme
Enamel
The enamel organ is compressed

10. What is dens in dente?
Only dentinal tubules with processes
Enamel organ invaginates into the dental papilla
The actual vertical movement of the tooth
The dental lamina

11. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Development of one or more extra teeth
The enamel organ - dental papilla - dental sac
A bilayer rim that consists only IEE and OEE
The ameloblasts

12. What are the formative cells for cementum?
Cementoblasts
The cementum - PDL - and alveolar bone
Local or systemic or hereditary
Trauma - pressure or metabolic disease

13. What will the outer cells of the dental lamina differentiate into?
The enamel organ is compressed
11th to 12th weeks
Dentin secreting cells (odontoblats)
Differentiation

14. What are succedaneous teeth?
Enamel secreting cells (ameloblasts)
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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.

15. What stage does the dental tissues subsequently fully mineralize
Lines of Retzuis
Maturation
The ectomesenchyme - which was influenced by the neural crest cells
Hereditary in localized form. endocrine dysfunction is complete

16. What is the primordium of the tooth?
The tooth germ
Tall columnar cells
Ameloblasts
Odontoblastic process

17. What are supernumerary teeth?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Trauma - pressure or metabolic disease
Development of one or more extra teeth

18. What stage does anodontia occur?
Initiation stage
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
Traumatic injury or crowding of teeth
9th to 10th weeks

19. What are the mature cells for cementum?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Cementocytes
Tooth germ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

20. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Connective
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontoclasts
The basement membrane

21. What is matrix?
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 dental sac
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

22. What is the time span for the bell stage?
Maturation
11th to 12th weeks
Osteoblasts
8th week

23. Which layer in the bell stage has star shaped cells?
The ectomesenchyme - which was influenced by the neural crest cells
The stellate reticulum
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ameloblasts

24. What type of tissue is dentin - cementum - and alveolar bone?
Connective
A mineralized cylinder - the dentinal tubule
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

25. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
The actual vertical movement of the tooth
Osteoblasts
The primordium of the pulp

26. What are the etiological factors for supernumerary teeth?
Maturation
11th to 12th weeks
Enamel
Hereditary

27. What are the formative cells for dentin?
Only dentinal tubules with processes
Into odontoblasts
Osteocytes
Odontoblasts

28. What hard tissue has vascularity?
Dentin secreting cells (odontoblats)
Odontogenesis
Alveolar bone
The permanent molars

29. What is the embryological background for dentin - cementum and alveolar bone?
Apposition of the cementum
The dental lamina
Dental papilla
Common with permanent maxillary molars

30. 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
Pressure on the area
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The tooth germ

31. What are the major components of the tooth germ?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Imbrication lines of von Ebner
The outer cells of the dental papilla and the central cells of the dental papilla
The enamel organ - dental papilla - dental sac

32. What happens during the appositional stage?
Compressed layer of flat to cuboidal cells
The enamel - dentin - and cementum are secreted in successive layers
During the cap stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

33. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

34. What are the incremental lines for dentin?
Odontoblasts
Enamel organ invaginates into the dental papilla
The apposition of the enamel matrix
Imbrication lines of von Ebner

35. In the cap stage the tooth bud does not grow - what happens?
Faulty development of enamel from interference involving ameloblasts
Odontoblasts
There is unequal growth in different parts of the tooth bud
The permanent molars

36. What are the incremental lines for cementum and alveolar bone?
Dental tissues secreted as matrix in successive layers.
When the gingiva recedes and no actual tooth movement takes place
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Arrest and reversal lines

37. What kind of cells reside in the stratum intermediate?
The basement membrane
8th week
Sphere of enamel on root
Compressed layer of flat to cuboidal cells

38. What are the etiological factors for dens in dente and gemination?
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
Epithelial
Hereditary

39. What is the time span for the bud stage?
Connective
8th week
Enamel secreting cells (ameloblasts)
Dental tissues secreted as matrix in successive layers.

40. What is macrodontia?
Abnormally large teeth
Dens in dente - gemination - tubercle - and fusion
The actual vertical movement of the tooth
Maturation

41. What are entrapped cementoblasts called?
Imbrication lines of von Ebner
Osteoblasts
Cementocytes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

42. What is gemination?
Common on permanent molars or cingulum of anterior teeth
The ectoderm
Dens in dente - gemination - tubercle - and fusion
Tooth germ tries to divide

43. What will the inner cells of the dental lamina differentiates into?
Induction
Oral epithelium
4 types
The primordium of the pulp

44. What happens when the reduced enamel epithelium is created?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla
Sphere of enamel on root
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

45. Where is the dental sac originally derived from?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Osteoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme

46. What is the time span for initiation?
6th to 7th weeks
The ameloblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Arrest and reversal lines

47. What are the clinical ramifications of anodontia?
Osteoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The dental lamina

48. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Local or systemic or hereditary
A mineralized cylinder - the dentinal tubule
The ectomesenchyme
Odontoclasts

49. The stratum intermediate is located inner or outer?
Faulty development of enamel from interference involving ameloblasts
Morphogenesis
Proliferation
Inner

50. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Trauma - pressure or metabolic disease
Epithelial rests of Malassez
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoblasts