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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. What stage does anodontia occur?
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
Dental tissues fully mineralize to their mature levels.
Initiation stage

2. What is the predominate process in the bell stage?
Cementoid
Differentiation
The tooth germ
Dental tissues secreted as matrix in successive layers.

3. What is matrix?
The outer cells of the dental papilla and the central cells of the dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Only dentinal tubules with processes
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

4. What is the process involved in the maturation 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.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel pearl - enamel dysplasia - and concresence
Maturation

5. What are the etiological factors of enamel dysplasia?
Induction - proliferation
8th week
Local or systemic or hereditary
Differentiation - proliferation - morphogenesis

6. What happens during the bell stage?
The primordium of the pulp
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentin and alveolar bone
The basement membrane

7. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Common on permanent molars or cingulum of anterior teeth
Cuboidal cells
Bud stage

8. What are entrapped cementoblasts called?
Cementocytes
The basement membrane
The cervical loop
Into odontoblasts

9. What is amelogenisis?
The ectomesenchyme - which was influenced by the neural crest cells
The apposition of the enamel matrix
Preameloblasts
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. What are the mature cells for enamel?
Initiation stage
There are none - they are lost with eruption
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dentin secreting cells (odontoblats)

11. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Future dentin and pulp tissue
Bud stage
Union of 2 adjacent tooth germs
Odontoclasts

12. The preameloblasts induce dental papilla cells to differentiate into what?
Cementocytes
Into odontoblasts
During the cap stage
Dental tissues secreted as matrix in successive layers.

13. How is the dentinocemental junction formed?
Proliferation
As a result of the apposition of cementum over dentin
Extra cusp due to effects on enamel organ
Common with permanent maxillary molars

14. What are the processes involved in the cap stage?
Arrest and reversal lines
Proliferation - differentiation - morphogenesis
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

15. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementocytes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Enamel organ invaginates into the dental papilla

16. What is the outer portion of the ectoderm in the initiation stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Proliferation - differentiation - morphogenesis
Oral epithelium
Osteocytes

17. What does the cervical loop consist of?
The cementum - PDL - and alveolar bone
The basement membrane
A bilayer rim that consists only IEE and OEE
The dental lamina

18. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Enamel organ
During the cap stage
The cervical loop

19. What is the time span for the bud stage?
8th week
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Inner
Future dentin and pulp tissue

20. What are the clinical ramifications of enamel dysplasia?
The ectomesenchyme - which was influenced by the neural crest cells
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Development of one or more extra teeth
The enamel - dentin - and cementum are secreted in successive layers

21. The stratum intermediate is located inner or outer?
Inner
Odontoclasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Ameloblasts

22. What is the site for the future dentioenamel junction?
Proliferation - differentiation - morphogenesis
Odontoblastic process
Union of 2 adjacent tooth germs
The basement membrane that seperates the enamel organ and dental papilla

23. What happens during the apposition stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dental tissues secreted as matrix in successive layers.
There are none - they are lost with eruption
The enamel organ is compressed

24. What are the formative cells for alveolar bone?
11th to 12th weeks
Osteoblasts
Trauma - pressure or metabolic disease
Cuboidal cells

25. What happens when the reduced enamel epithelium is created?
The stellate reticulum
Maturation
The ectomesenchyme
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

26. How many types of cells are found in the enamel organ in the bell stage?
Dentin secreting cells (odontoblats)
Compressed layer of flat to cuboidal cells
Outer
4 types

27. How is the reduced enamel epithelium created?
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 enamel organ is compressed
The enamel - dentin - and cementum are secreted in successive layers
Absence of single or multiple teeth

28. What is the function of the Hertwig's epithelial root sheath?
Dental papilla
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
Inner

29. What are the incremental lines for enamel?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The outer cells of the dental papilla and the central cells of the dental papilla
Cementocytes
Lines of Retzuis

30. What are succedaneous teeth?
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
There is unequal growth in different parts of the tooth bud
Inner
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

31. What hard tissue has vascularity?
Alveolar bone
Odontoclasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Tooth germ

32. What is the embryological background for enamel?
Traumatic injury or crowding of teeth
The basement membrane that seperates the enamel organ and dental papilla
Enamel organ
Tooth germ tries to divide

33. What happens during the appositional stage?
The basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Osteocytes
The enamel - dentin - and cementum are secreted in successive layers

34. What is the main process involved in initiation?
Dens in dente - gemination - tubercle - and fusion
Induction
Sphere of enamel on root
There is unequal growth in different parts of the tooth bud

35. What is dens in dente?
Connective
Morphogenesis
The basement membrane
Enamel organ invaginates into the dental papilla

36. What are the etiological factors for supernumerary teeth?
The cementum - PDL - and alveolar bone
Differentiation - proliferation - morphogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Hereditary

37. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The tooth germ
Odontoblastic process
Osteocytes
Future dentin and pulp tissue

38. What are the clinical ramifications of concrescence?
Enamel organ
Common with permanent maxillary molars
Faulty development of enamel from interference involving ameloblasts
Future dentin and pulp tissue

39. Do odontoblasts start their secretion of matrix before the ameloblasts?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel
Odontoblasts

40. What do the odontoblasts do?
Absence of single or multiple teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Traumatic injury or crowding of teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

41. What are the clinical ramifications of supernumerary teeth?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Enamel
Common with permanent maxillary molars
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

42. In the cap stage the tooth bud does not grow - what happens?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There is unequal growth in different parts of the tooth bud
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

43. Which teeth are nonsuccedaneous?
The permanent molars
Cementocytes
Outer
The basement membrane that seperates the enamel organ and dental papilla

44. What are the formative cells for dentin?
The basement membrane that seperates the enamel organ and dental papilla
The tooth germ
Odontoblasts
Imbrication lines of von Ebner

45. What will the inner cells of the dental lamina differentiates into?
Dental papilla
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The dental sac
The primordium of the pulp

46. What happens during the cap stage?
Initiation stage
Union of root structure of two or more teeth by cementum
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 papilla

47. What are the etiological factors for fusion?
The cervical loop
Compressed layer of flat to cuboidal cells
Extra cusp due to effects on enamel organ
Pressure on the area

48. Where is the dental sac originally derived from?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectomesenchyme
Preameloblasts
There are none - they are lost with eruption

49. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
The ameloblasts
The enamel organ
Lines of Retzuis

50. What is macrodontia?
Apposition of the cementum
Dental tissues fully mineralize to their mature levels.
Abnormally large teeth
Dentin secreting cells (odontoblats)

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Dentistry Tooth Development And Eruption

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