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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. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Dens in dente - gemination - tubercle - and fusion
Differentiation - proliferation - morphogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The dental sac

2. What is another name for the dental sac?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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.
Dental follicle
Trauma - pressure or metabolic disease

3. What are the clinical ramifications of micro/macrodontia?
Tooth germ
As a result of the apposition of cementum over dentin
Cementoid
Commonly involves permanent maxillary lateral incisor and 3rd molars

4. What are the clinical ramifications of concrescence?
Tall columnar cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Common with permanent maxillary molars
Apposition of the cementum

5. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The enamel organ is compressed
Cuboidal cells
Preameloblasts
Union of root structure of two or more teeth by cementum

6. What are the etiological factors for micro/macrodontia?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Cementocytes
Hereditary in localized form. endocrine dysfunction is complete
Development of one or more extra teeth

7. What are the etiological factors for enamel pearl?
Cementoid
Bud stage
Inner
Displacement of ameloblasts to root surface

8. How is the dentinocemental junction formed?
Imbrication lines of von Ebner
Compressed layer of flat to cuboidal cells
Osteocytes
As a result of the apposition of cementum over dentin

9. What is the predominate process of the cap stage?
Dental papilla
The dental sac
Morphogenesis
Displacement of ameloblasts to root surface

10. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
In the cap stage
Common with permanent maxillary molars
Cementoblasts
Future dentin and pulp tissue

11. What are the incremental lines for enamel?
Enamel pearl - enamel dysplasia - and concresence
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Faulty development of enamel from interference involving ameloblasts
Lines of Retzuis

12. What will the dental sac give rise to?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Osteocytes
The cementum - PDL - and alveolar bone
May be confused as calculus deposit on root

13. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
The ectomesenchyme
Dental tissues secreted as matrix in successive layers.
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

14. What are the etiological factors for supernumerary teeth?
Hereditary
The enamel - dentin - and cementum are secreted in successive layers
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
8th week

15. What is the time span for the cap stage?
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.
9th to 10th weeks
The enamel organ is compressed
Enamel pearl - enamel dysplasia - and concresence

16. What are supernumerary teeth?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Development of one or more extra teeth
The outer cells of the dental papilla and the central cells of the dental papilla
Tall columnar cells

17. What is microdontia?
Trauma - pressure or metabolic disease
Cementoblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally small teeth

18. What kind of cells occur in the inner enamel epithelium?
8th week
Imbrication lines of von Ebner
Tall columnar cells
A mineralized cylinder - the dentinal tubule

19. The stellate reticulum is located inner or outer?
Cementoblasts
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
Outer

20. What are the developmental disturbances of the cap stage?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dental follicle
Dens in dente - gemination - tubercle - and fusion
Osteocytes

21. When does the process of root development take place?
The dental lamina
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.
A bilayer rim that consists only IEE and OEE
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

22. What is macrodontia?
Initiation
Abnormally large teeth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The apposition of the enamel matrix

23. What is an enamel pearl?
Osteoblasts
Sphere of enamel on root
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dental tissues fully mineralize to their mature levels.

24. What stage does anodontia occur?
In the cap stage
Into odontoblasts
Abnormally small teeth
Initiation stage

25. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Trauma - pressure or metabolic disease
Cementoblasts
The basement membrane
Dental papilla

26. What are the clinical ramifications of supernumerary teeth?
Traumatic injury or crowding of teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Future dentin and pulp tissue

27. What is amelogenisis?
The apposition of the enamel matrix
Extra cusp due to effects on enamel organ
The ectomesenchyme
The enamel organ - dental papilla - dental sac

28. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Osteocytes
8th week
The ameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface

29. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Odontoblasts
Hereditary
Connective
Tooth germ

30. What are the major components of the tooth germ?
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
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The enamel organ - dental papilla - dental sac
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

31. The stratum intermediate is located inner or outer?
Inner
Outer
There are none - they are lost with eruption
When the gingiva recedes and no actual tooth movement takes place

32. What processes are involved in the bell stage?
Only dentinal tubules with processes
Differentiation - proliferation - morphogenesis
Bud stage
Enamel pearl - enamel dysplasia - and concresence

33. What are the incremental lines for dentin?
Proliferation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Imbrication lines of von Ebner
The ectomesenchyme

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

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35. Where is the dental papilla originally derived from?
The enamel organ - dental papilla - dental sac
The ectomesenchyme - which was influenced by the neural crest cells
A bilayer rim that consists only IEE and OEE
Tooth germ tries to divide

36. The oral epithelium is induced by the ectomesenchyme to produce what?
8th week
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The stellate reticulum
The dental lamina

37. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
There are none - they are lost with eruption
Lines of Retzuis
Cementocytes
The ameloblasts

38. What is the primordium of the tooth?
Initiation stage
Union of root structure of two or more teeth by cementum
The tooth germ
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.

39. Where is the dental sac originally derived from?
A bilayer rim that consists only IEE and OEE
Epithelial
The ectomesenchyme
Hereditary in localized form. endocrine dysfunction is complete

40. Active eruption
Arrest and reversal lines
The actual vertical movement of the tooth
Dental papilla
Inner

41. What happens during the bell stage?
The dental sac
Enamel organ invaginates into the dental papilla
Enamel secreting cells (ameloblasts)
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

42. What is enamel dysplasia?
Development of one or more extra teeth
Faulty development of enamel from interference involving ameloblasts
May be confused as calculus deposit on root
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

43. What else undergoes proliferation in the bud stage besides the dental lamina?
Connective
Cuboidal cells
Lines of Retzuis
The ectomesenchyme

44. What are the etiological factors for anodontia?
Dental tissues secreted as matrix in successive layers.
Compressed layer of flat to cuboidal cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

45. Which layer in the bell stage has star shaped cells?
8th week
Outer
As a result of the apposition of cementum over dentin
The stellate reticulum

46. What is the site for the future dentioenamel junction?
Extra cusp due to effects on enamel organ
Proliferation - differentiation - morphogenesis
The basement membrane that seperates the enamel organ and dental papilla
The ectomesenchyme

47. What are the etiological factors of tubercle?
Cementoblasts
The enamel - dentin - and cementum are secreted in successive layers
Trauma - pressure or metabolic disease
Dens in dente - gemination - tubercle - and fusion

48. What are the cell layers found in the enamel organ in the bell stage?
8th week
Abnormally large teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
May be confused as calculus deposit on root

49. What is the outer portion of the ectoderm in the initiation stage?
Enamel organ
Maturation
Osteoblasts
Oral epithelium

50. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Induction
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
Cuboidal cells
Odontoclasts