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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. What is the main process involved in the bud stage?
The enamel organ is compressed
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Proliferation

2. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Extra cusp due to effects on enamel organ
Absence of single or multiple teeth
Ameloblasts

3. What are the formative cells for enamel?
Local or systemic or hereditary
Ameloblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Imbrication lines of von Ebner

4. What is the process involved in the maturation stage?
Odontoblasts
Induction
Maturation
Epithelial rests of Malassez

5. What are the clinical ramifications of anodontia?
Enamel pearl - enamel dysplasia - and concresence
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cuboidal cells
11th to 12th weeks

6. What kind of cells occur in the inner enamel epithelium?
When the gingiva recedes and no actual tooth movement takes place
Tall columnar cells
May be confused as calculus deposit on root
The cementum - PDL - and alveolar bone

7. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
8th week
Initiation
Dental papilla

8. What does the cervical loop consist of?
Cementocytes
Union of 2 adjacent tooth germs
It disintegrates as the developing oral mucosa comes to line the oral cavity
A bilayer rim that consists only IEE and OEE

9. 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
Enamel secreting cells (ameloblasts)
Enamel organ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

10. What is the time span for the bell stage?
11th to 12th weeks
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.
Hereditary in localized form. endocrine dysfunction is complete
Enamel organ

11. What will the outer cells of the dental lamina differentiate into?
Absence of single or multiple teeth
Dentin secreting cells (odontoblats)
Induction - proliferation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

12. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Apposition of the cementum
The enamel organ - dental papilla - dental sac
In the cap stage

13. What are the formative cells for dentin?
The stellate reticulum
Compressed layer of flat to cuboidal cells
Odontoblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

14. Passive eruption
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane
When the gingiva recedes and no actual tooth movement takes place
Lines of Retzuis

15. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Proliferation - differentiation - morphogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

16. What is the function of the Hertwig's epithelial root sheath?
Enamel organ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Displacement of ameloblasts to root surface
The apposition of the enamel matrix

17. What are the etiological factors of tubercle?
There are none - they are lost with eruption
Trauma - pressure or metabolic disease
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Abnormally small teeth

18. What is another name for the dental sac?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Tooth germ
Dental follicle
Sphere of enamel on root

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

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20. When does the tooth bud become a tooth germ?
The basement membrane
Abnormally large teeth
Tall columnar cells
In the cap stage

21. What is the cap in the cap stage?
Cementoblasts
Common on permanent molars or cingulum of anterior teeth
The enamel organ
In the cap stage

22. What is the predominate process in the bell stage?
Odontoblastic process
Union of root structure of two or more teeth by cementum
Proliferation
Differentiation

23. What layer serves as protection for the enamel organ?
Arrest and reversal lines
The outer enamel epithelium
Preameloblasts
The actual vertical movement of the tooth

24. What is concrescence?
Sphere of enamel on root
11th to 12th weeks
Union of root structure of two or more teeth by cementum
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

25. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Dental tissues secreted as matrix in successive layers.
8th week
The dental sac
The ameloblasts

26. What is microdontia?
Connective
The primordium of the pulp
There are none - they are lost with eruption
Abnormally small teeth

27. What is macrodontia?
Induction
Abnormally large teeth
The dental sac
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

28. What are the clinical ramifications of dens in dente?
Initiation stage
Cuboidal cells
Hereditary
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

29. What hard tissue has vascularity?
The enamel organ is compressed
Alveolar bone
Arrest and reversal lines
Pressure on the area

30. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Only dentinal tubules with processes
Osteoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

31. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Epithelial
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Enamel secreting cells (ameloblasts)

32. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Cementocytes
9th to 10th weeks
The tooth germ

33. What hard tissue is can not have tissue formation after eruption?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Initiation stage
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel

34. What is the primordium of the tooth?
The ameloblasts
Common on permanent molars or cingulum of anterior teeth
Lines of Retzuis
The tooth germ

35. What are the mature cells for dentin?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Only dentinal tubules with processes
Local or systemic or hereditary

36. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The ameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

37. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel secreting cells (ameloblasts)
Inner
During the cap stage
Preameloblasts

38. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
11th to 12th weeks
Connective
Tall columnar cells

39. What are the mature cells for cementum?
The tooth germ
May be confused as calculus deposit on root
Outer
Cementocytes

40. What kind of cells occur in the outer enamel epithelium in the bell stage?
The outer enamel epithelium
Proliferation - differentiation - morphogenesis
Cuboidal cells
Arrest and reversal lines

41. What is an enamel pearl?
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
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Oral epithelium
Sphere of enamel on root

42. What are the development disturbances of the apposition and maturation stages?
Morphogenesis
Into odontoblasts
Dentin secreting cells (odontoblats)
Enamel pearl - enamel dysplasia - and concresence

43. What are the clinical ramifications of micro/macrodontia?
Epithelial rests of Malassez
Initiation
The ectomesenchyme
Commonly involves permanent maxillary lateral incisor and 3rd molars

44. What are the major components of the tooth germ?
Outer
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
Differentiation - proliferation - morphogenesis

45. What is the outer portion of the ectoderm in the initiation stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Union of 2 adjacent tooth germs
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Oral epithelium

46. Which layer in the bell stage has star shaped cells?
8th week
Tooth germ
The stellate reticulum
Traumatic injury or crowding of teeth

47. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Morphogenesis
Maturation
Dental papilla

48. What is the structure responsible for root development?
Enamel pearl - enamel dysplasia - and concresence
The cervical loop
4 types
Common with permanent maxillary molars

49. What stage does anodontia occur?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Trauma - pressure or metabolic disease
Initiation stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

50. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Dental follicle
The ameloblasts place an acellular dental cuticle on the new enamel surface
Initiation