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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. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Hereditary in localized form. endocrine dysfunction is complete
Sphere of enamel on root
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Epithelial rests of Malassez

2. What do the odontoblasts do?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
11th to 12th weeks
Compressed layer of flat to cuboidal cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

3. What is the main process involved in initiation?
Osteocytes
Enamel pearl - enamel dysplasia - and concresence
Odontoclasts
Induction

4. What are the formative cells for cementum?
Enamel
Cementoblasts
Epithelial rests of Malassez
Dental follicle

5. What are the clinical ramifications of gemination?

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6. In the cap stage the tooth bud does not grow - what happens?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
There is unequal growth in different parts of the tooth bud
The cementum - PDL - and alveolar bone
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

7. What is concrescence?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells
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
Union of root structure of two or more teeth by cementum

8. Active eruption
Outer
The actual vertical movement of the tooth
The enamel - dentin - and cementum are secreted in successive layers
Dental tissues fully mineralize to their mature levels.

9. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
There is unequal growth in different parts of the tooth bud
The enamel organ - dental papilla - dental sac
Imbrication lines of von Ebner

10. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
A bilayer rim that consists only IEE and OEE
Outer
The dental sac

11. What will the outer cells of the dental lamina differentiate into?
The stellate reticulum
Bud stage
The enamel organ - dental papilla - dental sac
Dentin secreting cells (odontoblats)

12. What type of tissue is dentin - cementum - and alveolar bone?
Enamel organ invaginates into the dental papilla
Odontogenesis
Connective
Abnormally large teeth

13. What are the cell layers found in the enamel organ in the bell stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Extra cusp due to effects on enamel organ
Cuboidal cells

14. The preameloblasts induce dental papilla cells to differentiate into what?
The enamel - dentin - and cementum are secreted in successive layers
Odontoclasts
Morphogenesis
Into odontoblasts

15. What happens when the reduced enamel epithelium is created?
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
The tooth germ
Ameloblasts
Enamel organ

16. What is the function of the Hertwig's epithelial root sheath?
The ectomesenchyme
Hereditary
The outer cells of the dental papilla and the central cells of the dental papilla
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

17. What else undergoes proliferation in the bud stage besides the dental lamina?
A mineralized cylinder - the dentinal tubule
The ectomesenchyme
Hereditary in localized form. endocrine dysfunction is complete
Lines of Retzuis

18. What stage does supernumerary teeth occur?
The basement membrane
There are none - they are lost with eruption
The bud stage
Initiation

19. When does the process of root development take place?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The enamel - dentin - and cementum are secreted in successive layers
Oral epithelium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

20. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Odontoblastic process
Dentin secreting cells (odontoblats)
Enamel secreting cells (ameloblasts)

21. What is the main process involved in the bud stage?
Compressed layer of flat to cuboidal cells
Abnormally small teeth
Proliferation
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

22. What happens during the maturation stage?
The ectomesenchyme
Absence of single or multiple teeth
Dental tissues fully mineralize to their mature levels.
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.

23. What are the mature cells for cementum?
Connective
Cementocytes
The tooth germ
Enamel pearl - enamel dysplasia - and concresence

24. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
There are none - they are lost with eruption
Hereditary
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

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

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26. What are the etiological factors for micro/macrodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary in localized form. endocrine dysfunction is complete
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dentin and alveolar bone

27. What is amelogenisis?
The apposition of the enamel matrix
Union of root structure of two or more teeth by cementum
Osteocytes
Tooth germ tries to divide

28. What are the clinical ramifications of supernumerary teeth?
Imbrication lines of von Ebner
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoblastic process
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

29. What kind of cells reside in the stratum intermediate?
The tooth germ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Compressed layer of flat to cuboidal cells
Hereditary

30. What are the incremental lines for enamel?
Lines of Retzuis
Tooth germ tries to divide
Dental tissues fully mineralize to their mature levels.
The ectomesenchyme

31. What is anodontia?
Outer
Tooth germ tries to divide
In the cap stage
Absence of single or multiple teeth

32. What are the etiological factors for fusion?
Pressure on the area
The ameloblasts place an acellular dental cuticle on the new enamel surface
Osteoblasts
Epithelial

33. What are entrapped cementoblasts called?
Epithelial
Displacement of ameloblasts to root surface
Cementocytes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

34. How is the dentinocemental junction formed?
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
In the cap stage
As a result of the apposition of cementum over dentin
The enamel organ

35. What is the predominate process in the bell stage?
The actual vertical movement of the tooth
The ectomesenchyme - which was influenced by the neural crest cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Differentiation

36. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Induction
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The bud stage
The ectomesenchyme - which was influenced by the neural crest cells

37. What is the primordium of the tooth?
Ameloblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The tooth germ

38. Tooth development
When the gingiva recedes and no actual tooth movement takes place
Extra cusp due to effects on enamel organ
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontogenesis

39. Which teeth are nonsuccedaneous?
Pressure on the area
The basement membrane that seperates the enamel organ and dental papilla
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
The permanent molars

40. How is the reduced enamel epithelium created?
Hereditary
The enamel organ is compressed
The ectomesenchyme
Odontoblasts

41. What is the cementum matrix called?
Compressed layer of flat to cuboidal cells
Cementoid
Differentiation - proliferation - morphogenesis
The outer enamel epithelium

42. What layer serves as protection for the enamel organ?
Common with permanent maxillary molars
Enamel secreting cells (ameloblasts)
Maturation
The outer enamel epithelium

43. The stratum intermediate is located inner or outer?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The basement membrane
Inner
Cementoblasts

44. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Alveolar bone
Morphogenesis
As a result of the apposition of cementum over dentin
Odontoblastic process

45. What is the process involved in the maturation stage?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Bud stage
Dens in dente - gemination - tubercle - and fusion
Maturation

46. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Alveolar bone
Absence of single or multiple teeth
Epithelial

47. What processes are involved in the bell stage?
The outer enamel epithelium
Differentiation - proliferation - morphogenesis
Enamel
Cementoblasts

48. What are the etiological factors of tubercle?
Local or systemic or hereditary
The cervical loop
The ameloblasts
Trauma - pressure or metabolic disease

49. What hard tissue is innervated by nerves?
The ectoderm
Sphere of enamel on root
Osteoblasts
Dentin and alveolar bone

50. What is fusion?
Cementocytes
Union of 2 adjacent tooth germs
Odontoclasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin