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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 stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The bud stage
As a result of the apposition of cementum over dentin
The ectomesenchyme

2. What is the process involved in the maturation stage?
Sphere of enamel on root
Dentin and alveolar bone
Hereditary
Maturation

3. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Local or systemic or hereditary
Dentin and alveolar bone
Dental papilla

4. What will the dental sac give rise to?
Odontoblastic process
The apposition of the enamel matrix
Connective
The cementum - PDL - and alveolar bone

5. Where is the dental papilla originally derived from?
Dental tissues secreted as matrix in successive layers.
Pressure on the area
The ectomesenchyme - which was influenced by the neural crest cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

6. What is cementogenisis?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Apposition of the cementum
Commonly involves permanent maxillary lateral incisor and 3rd molars
The dental lamina

7. What wll the inner enamel epithelium differentiate into?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel secreting cells (ameloblasts)
The basement membrane that seperates the enamel organ and dental papilla
Hereditary

8. Where is the enamal organ originally derived from?
Preameloblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ectoderm
Tooth germ

9. What are the etiological factors for dens in dente and gemination?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

10. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
In the cap stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

11. What is enamel dysplasia?
There is unequal growth in different parts of the tooth bud
Local or systemic or hereditary
Faulty development of enamel from interference involving ameloblasts
Cementocytes

12. What are the etiological factors for supernumerary teeth?
Maturation
Ameloblasts
Dental papilla
Hereditary

13. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Displacement of ameloblasts to root surface
It disintegrates as the developing oral mucosa comes to line the oral cavity
Differentiation
Common with permanent maxillary molars

14. When does the process of root development take place?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
4 types
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

15. What is matrix?
Into odontoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The enamel organ - dental papilla - dental sac
Induction

16. What will the dental papilla eventually form?
Osteoblasts
Bud stage
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
Future dentin and pulp tissue

17. What are the clinical ramifications of fusion?
Trauma - pressure or metabolic disease
Oral epithelium
The primordium of the pulp
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

18. In the cap stage the tooth bud does not grow - what happens?
Differentiation
Union of 2 adjacent tooth germs
There is unequal growth in different parts of the tooth bud
Odontoblastic process

19. What is the cap in the cap stage?
Dental tissues fully mineralize to their mature levels.
As a result of the apposition of cementum over dentin
The enamel organ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

20. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Tooth germ tries to divide
The stellate reticulum
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

21. What kind of cells reside in the stratum intermediate?
Cementoid
In the cap stage
Morphogenesis
Compressed layer of flat to cuboidal cells

22. What will the outer cells of the dental lamina differentiate into?
Alveolar bone
Dentin secreting cells (odontoblats)
Odontogenesis
Initiation

23. Active eruption
Odontoclasts
Cuboidal cells
The actual vertical movement of the tooth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

24. The stratum intermediate is located inner or outer?
Common on permanent molars or cingulum of anterior teeth
Inner
Oral epithelium
Hereditary

25. What stage does the dental tissues subsequently fully mineralize
Future dentin and pulp tissue
The bud stage
Maturation
There is unequal growth in different parts of the tooth bud

26. What type of tissue is enamel?
Epithelial
9th to 10th weeks
4 types
Tooth germ tries to divide

27. What is the main process involved in the bud stage?
Cuboidal cells
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
9th to 10th weeks
Proliferation

28. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Differentiation - proliferation - morphogenesis
Absence of single or multiple teeth
Preameloblasts
The enamel organ

29. How is the reduced enamel epithelium created?
The enamel organ is compressed
Differentiation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Cementocytes

30. What layer serves as protection for the enamel organ?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Extra cusp due to effects on enamel organ
The outer enamel epithelium
Induction

31. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Initiation
Displacement of ameloblasts to root surface
Hereditary

32. What are the mature cells for enamel?
Osteocytes
The apposition of the enamel matrix
There are none - they are lost with eruption
Union of 2 adjacent tooth germs

33. What is dens in dente?
There is unequal growth in different parts of the tooth bud
The enamel organ
Ameloblasts
Enamel organ invaginates into the dental papilla

34. What are the mature cells for dentin?
Only dentinal tubules with processes
Union of root structure of two or more teeth by cementum
Enamel organ invaginates into the dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

35. How is the dentinocemental junction formed?
Displacement of ameloblasts to root surface
As a result of the apposition of cementum over dentin
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel

36. What is the time span for initiation?
6th to 7th weeks
11th to 12th weeks
When the gingiva recedes and no actual tooth movement takes place
Local or systemic or hereditary

37. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Induction
Abnormally small teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface

38. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Pressure on the area
Osteocytes
Epithelial

39. What are the clinical ramifications of anodontia?
Induction
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Arrest and reversal lines
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

40. What is anodontia?
Absence of single or multiple teeth
The dental sac
The basement membrane
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

41. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoid
The ectoderm
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

42. Do odontoblasts start their secretion of matrix before the ameloblasts?
The stellate reticulum
Dental tissues fully mineralize to their mature levels.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane that seperates the enamel organ and dental papilla

43. What are the etiological factors of enamel dysplasia?
Only dentinal tubules with processes
Local or systemic or hereditary
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 primordium of the pulp

44. What are the clinical ramifications?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The apposition of the enamel matrix
The enamel - dentin - and cementum are secreted in successive layers
Common on permanent molars or cingulum of anterior teeth

45. What are the clinical ramifications of supernumerary teeth?
There is unequal growth in different parts of the tooth bud
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 actual vertical movement of the tooth
Odontoclasts

46. What are the incremental lines for dentin?
Cementoblasts
Pressure on the area
Imbrication lines of von Ebner
Initiation

47. What do the odontoblasts do?
The actual vertical movement of the tooth
It disintegrates as the developing oral mucosa comes to line the oral cavity
Traumatic injury or crowding of teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

48. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
The basement membrane
Bud stage
There are none - they are lost with eruption

49. What happens when the reduced enamel epithelium is created?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally large teeth
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

50. What is the time span for the bell stage?
The enamel organ
A bilayer rim that consists only IEE and OEE
Tooth germ
11th to 12th weeks