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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The tooth germ
Abnormally small teeth
Absence of single or multiple teeth

2. What are the clinical ramifications of enamel dysplasia?
6th to 7th weeks
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
8th week
Dental follicle

3. What is the structure responsible for root development?
The cervical loop
Epithelial rests of Malassez
8th week
Compressed layer of flat to cuboidal cells

4. What stage does supernumerary teeth occur?
Traumatic injury or crowding of teeth
Imbrication lines of von Ebner
Tall columnar cells
Initiation

5. What is the time span for the bud stage?
8th week
Enamel secreting cells (ameloblasts)
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The enamel organ

6. What is the main process involved in the bud stage?
Enamel organ invaginates into 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
Proliferation
Initiation

7. What type of tissue is enamel?
Hereditary
Apposition of the cementum
The stellate reticulum
Epithelial

8. What happens during the appositional stage?
The outer enamel epithelium
The enamel - dentin - and cementum are secreted in successive layers
Union of 2 adjacent tooth germs
8th week

9. What happens during the cap stage?
Differentiation
The ectoderm
It disintegrates as the developing oral mucosa comes to line the oral cavity
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.

10. The stratum intermediate is located inner or outer?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Inner
There is unequal growth in different parts of the tooth bud
Odontoclasts

11. What is cementogenisis?
In the cap stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Apposition of the cementum
Commonly involves permanent maxillary lateral incisor and 3rd molars

12. What is the time span for the bell stage?
Odontoblasts
Tooth germ tries to divide
11th to 12th weeks
Dental follicle

13. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Epithelial
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

14. What are the etiological factors for micro/macrodontia?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane
Hereditary in localized form. endocrine dysfunction is complete
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

15. When does the process of root development take place?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Bud stage
As a result of the apposition of cementum over dentin

16. What are the development disturbances of the apposition and maturation stages?
Ameloblasts
The stellate reticulum
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel pearl - enamel dysplasia - and concresence

17. What is the embryological background for dentin - cementum and alveolar bone?
As a result of the apposition of cementum over dentin
There is unequal growth in different parts of the tooth bud
Odontoclasts
Dental papilla

18. What are the etiological factors for dens in dente and gemination?
Hereditary
The stellate reticulum
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Maturation

19. Tooth development
Odontogenesis
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Apposition of the cementum

20. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
The ectomesenchyme
The dental lamina
During the cap stage

21. Active eruption
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
There are none - they are lost with eruption
Dental tissues secreted as matrix in successive layers.
The actual vertical movement of the tooth

22. What happens when the reduced enamel epithelium is created?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
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
Odontoblastic process
Imbrication lines of von Ebner

23. What is dens in dente?
Odontogenesis
The enamel organ
Enamel organ invaginates into the dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

24. What processes are involved in the bell stage?
Initiation
Differentiation - proliferation - morphogenesis
Odontogenesis
Oral epithelium

25. What kind of cells occur in the inner enamel epithelium?
Extra cusp due to effects on enamel organ
It disintegrates as the developing oral mucosa comes to line the oral cavity
Tall columnar cells
The basement membrane that seperates the enamel organ and dental papilla

26. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel organ
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 disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

27. What are the etiological factors of enamel dysplasia?
The enamel organ
The basement membrane
Local or systemic or hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

28. What are the clinical ramifications of concrescence?
The ectomesenchyme
Induction
Common with permanent maxillary molars
Enamel secreting cells (ameloblasts)

29. What is matrix?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Future dentin and pulp tissue

30. What hard tissue has vascularity?
Alveolar bone
Maturation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

31. What are the mature cells for alveolar bone?
Osteocytes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel organ invaginates into the dental papilla
The ectomesenchyme - which was influenced by the neural crest cells

32. What layer serves as protection for the enamel organ?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
11th to 12th weeks
The outer enamel epithelium
The ectoderm

33. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Enamel organ
9th to 10th weeks
Dental tissues fully mineralize to their mature levels.

34. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Dens in dente - gemination - tubercle - and fusion
The ectomesenchyme - which was influenced by the neural crest cells
Union of 2 adjacent tooth germs

35. What is the cap in the cap stage?
The ectoderm
The stellate reticulum
The enamel organ
The dental lamina

36. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Extra cusp due to effects on enamel organ
The ectomesenchyme
The bud stage

37. Passive eruption
Abnormally small teeth
Enamel organ
When the gingiva recedes and no actual tooth movement takes place
There is unequal growth in different parts of the tooth bud

38. What are the etiological factors of concrescence?
The primordium of the pulp
Traumatic injury or crowding of teeth
Dentin and alveolar bone
As a result of the apposition of cementum over dentin

39. Where is the dental papilla originally derived from?
6th to 7th weeks
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ectomesenchyme - which was influenced by the neural crest cells
There is unequal growth in different parts of the tooth bud

40. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
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 dental sac
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
When the gingiva recedes and no actual tooth movement takes place

41. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Induction
Enamel secreting cells (ameloblasts)
The cementum - PDL - and alveolar bone

42. What are the mature cells for dentin?
Only dentinal tubules with processes
Differentiation
The ameloblasts
Tooth germ tries to divide

43. What stage does anodontia occur?
Initiation stage
Cementoblasts
Oral epithelium
Local or systemic or hereditary

44. What are the etiological factors of tubercle?
The ectoderm
Trauma - pressure or metabolic disease
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental sac

45. How many types of cells are found in the enamel organ in the bell stage?
4 types
Epithelial
Compressed layer of flat to cuboidal cells
Into odontoblasts

46. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel organ
Hereditary in localized form. endocrine dysfunction is complete

47. What is the outer portion of the ectoderm in the initiation stage?
Osteoblasts
Oral epithelium
Abnormally large teeth
Epithelial rests of Malassez

48. What is gemination?
Tooth germ tries to divide
A mineralized cylinder - the dentinal tubule
Outer
8th week

49. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The bud stage
Dental follicle
Epithelial rests of Malassez

50. What will the inner cells of the dental lamina differentiates into?
The basement membrane that seperates the enamel organ and dental papilla
The primordium of the pulp
Cementoid
Commonly involves permanent maxillary lateral incisor and 3rd molars