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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. The preameloblasts induce dental papilla cells to differentiate into what?
The dental sac
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Into odontoblasts
Dental follicle

2. What kind of cells reside in the stratum intermediate?
Enamel organ invaginates into the dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars
Proliferation - differentiation - morphogenesis
Compressed layer of flat to cuboidal cells

3. What are the major components of the tooth germ?
The bud stage
Abnormally small teeth
The enamel organ - dental papilla - dental sac
Odontogenesis

4. What is the site for the future dentioenamel junction?
The primordium of the pulp
Tooth germ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The basement membrane that seperates the enamel organ and dental papilla

5. What are the etiological factors for fusion?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Sphere of enamel on root
Pressure on the area
Tooth germ tries to divide

6. What is microdontia?
Abnormally small teeth
The permanent molars
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
Tooth germ

7. What stage does supernumerary teeth occur?
Initiation
Osteoblasts
Into odontoblasts
The primordium of the pulp

8. What are the odontoblastic processes is contained in what?
When the gingiva recedes and no actual tooth movement takes place
A mineralized cylinder - the dentinal tubule
Sphere of enamel on root
Outer

9. What are the etiological factors for dens in dente and gemination?
Hereditary
Odontoblastic process
Initiation
Development of one or more extra teeth

10. What is anodontia?
Odontoclasts
Absence of single or multiple teeth
A bilayer rim that consists only IEE and OEE
As a result of the apposition of cementum over dentin

11. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Only dentinal tubules with processes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

12. What are the clinical ramifications of enamel dysplasia?
9th to 10th weeks
Dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

13. What stage does the dental tissues subsequently fully mineralize
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Maturation

14. What is the embryological background for dentin - cementum and alveolar bone?
There are none - they are lost with eruption
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementocytes
Dental papilla

15. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoblastic process
Alveolar bone
The tooth germ

16. What are succedaneous teeth?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The actual vertical movement of the tooth
Alveolar bone

17. What is an enamel pearl?
The enamel organ - dental papilla - dental sac
Sphere of enamel on root
In the cap stage
Local or systemic or hereditary

18. What is the primordium of the tooth?
Cementocytes
The tooth germ
Proliferation
It disintegrates as the developing oral mucosa comes to line the oral cavity

19. What are the development disturbances of the apposition and maturation stages?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentin secreting cells (odontoblats)
Enamel secreting cells (ameloblasts)
Enamel pearl - enamel dysplasia - and concresence

20. What are the formative cells for cementum?
Preameloblasts
Abnormally large teeth
Epithelial
Cementoblasts

21. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Imbrication lines of von Ebner
Epithelial
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

22. Tooth development
Odontogenesis
Dental tissues secreted as matrix in successive layers.
Maturation
Dental tissues fully mineralize to their mature levels.

23. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Maturation
Odontogenesis
The basement membrane
Odontoblastic process

24. What happens during the maturation stage?
11th to 12th weeks
The outer cells of the dental papilla and the central cells of the dental papilla
Dental tissues fully mineralize to their mature levels.
The dental lamina

25. What is the predominate process in the bell stage?
Morphogenesis
Ectoderm lining stomodeum gives rise to the oral epithelium and then to the dental lamina - adjacent to deeper ectomesenchyme - Which is influenced by the neural crest cells. Both tissues are seperated by a basement membrane
Differentiation
Development of one or more extra teeth

26. What happens when the reduced enamel epithelium is created?
8th week
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
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
Proliferation - differentiation - morphogenesis

27. What are the clinical ramifications?
Dental tissues secreted as matrix in successive layers.
Common on permanent molars or cingulum of anterior teeth
Union of 2 adjacent tooth germs
Osteoblasts

28. What are the cell layers found in the enamel organ in the bell stage?
The apposition of the enamel matrix
Maturation
Cuboidal cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

29. What is the time span for the bell stage?
Enamel organ
The basement membrane
In the cap stage
11th to 12th weeks

30. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
The ectomesenchyme
Dentin secreting cells (odontoblats)
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

31. What are the etiological factors for enamel pearl?
The apposition of the enamel matrix
The ectomesenchyme
Displacement of ameloblasts to root surface
Preameloblasts

32. What are the mature cells for alveolar bone?
Osteocytes
The actual vertical movement of the tooth
Compressed layer of flat to cuboidal cells
The basement membrane

33. What are the clinical ramifications of supernumerary teeth?
Ameloblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dental papilla
Morphogenesis

34. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Osteoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
The outer enamel epithelium
Dentin secreting cells (odontoblats)

35. What hard tissue has vascularity?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Enamel organ invaginates into the dental papilla
Alveolar bone
Odontoclasts

36. What is the main process involved in the bud stage?
Outer
Enamel organ
Proliferation
Osteoblasts

37. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Enamel pearl - enamel dysplasia - and concresence
Common with permanent maxillary molars
Commonly involves permanent maxillary lateral incisor and 3rd molars

38. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental tissues fully mineralize to their mature levels.
The bud stage
Initiation

39. What will the inner cells of the dental lamina differentiates into?
Hereditary
Arrest and reversal lines
The primordium of the pulp
Into odontoblasts

40. What is tubercle?
Common with permanent maxillary molars
Extra cusp due to effects on enamel organ
Tooth germ tries to divide
Cementocytes

41. What happens during the appositional stage?
Alveolar bone
Local or systemic or hereditary
The enamel - dentin - and cementum are secreted in successive layers
Union of 2 adjacent tooth germs

42. What is the outer portion of the ectoderm in the initiation stage?
Odontogenesis
Cementocytes
Osteocytes
Oral epithelium

43. When does dens in dente occur?
Apposition of the cementum
The permanent molars
During the cap stage
There are none - they are lost with eruption

44. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoblasts
Odontoclasts

45. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Sphere of enamel on root
The cervical loop
Apposition of the cementum
It disintegrates as the developing oral mucosa comes to line the oral cavity

46. What kind of cells occur in the inner enamel epithelium?
The cementum - PDL - and alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Tall columnar cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

47. What happens during the bell stage?
Dentin secreting cells (odontoblats)
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Local or systemic or hereditary
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

48. What is the embryological background for enamel?
Outer
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.
Cementocytes
Enamel organ

49. How many types of cells are found in the enamel organ in the bell stage?
4 types
Enamel secreting cells (ameloblasts)
Dental tissues secreted as matrix in successive layers.
Hereditary

50. What will the outer cells of the dental lamina differentiate into?
Proliferation - differentiation - morphogenesis
Arrest and reversal lines
Dentin secreting cells (odontoblats)
Initiation stage