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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 are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Future dentin and pulp tissue
Dental tissues secreted as matrix in successive layers.
The basement membrane that seperates the enamel organ and dental papilla
Odontoclasts

2. Where is the enamal organ originally derived from?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Morphogenesis
Enamel
The ectoderm

3. What will the inner cells of the dental lamina differentiates into?
Apposition of the cementum
The permanent molars
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The primordium of the pulp

4. What wll the inner enamel epithelium differentiate into?
A bilayer rim that consists only IEE and OEE
Enamel secreting cells (ameloblasts)
Into odontoblasts
There are none - they are lost with eruption

5. What are the etiological factors for dens in dente and gemination?
Hereditary
Dental tissues secreted as matrix in successive layers.
9th to 10th weeks
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

6. What are the mature cells for cementum?
The cementum - PDL - and alveolar bone
Cementocytes
Hereditary
The outer enamel epithelium

7. What are supernumerary teeth?
Osteocytes
Development of one or more extra 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
The ectomesenchyme

8. What are the clinical ramifications of supernumerary teeth?
Hereditary in localized form. endocrine dysfunction is complete
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 pearl - enamel dysplasia - and concresence
The enamel organ

9. What happens when the reduced enamel epithelium is created?
Pressure on the area
The apposition of the enamel matrix
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

10. Active eruption
Dentin and alveolar bone
The ectoderm
Cementoblasts
The actual vertical movement of the tooth

11. What stage does anodontia occur?
8th week
Connective
Initiation stage
Maturation

12. What is the embryological background for enamel?
Enamel organ
Induction - proliferation
Trauma - pressure or metabolic disease
8th week

13. Where is the dental sac originally derived from?
Dental follicle
Union of 2 adjacent tooth germs
Hereditary
The ectomesenchyme

14. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
In the cap stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Extra cusp due to effects on enamel organ

15. What are the mature cells for dentin?
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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Only dentinal tubules with processes
Dens in dente - gemination - tubercle - and fusion

16. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Induction - proliferation
Cementoblasts
Enamel
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.

17. What is the primordium of the tooth?
The tooth germ
Displacement of ameloblasts to root surface
Union of 2 adjacent tooth germs
The ectoderm

18. Passive eruption
The permanent molars
When the gingiva recedes and no actual tooth movement takes place
Tall columnar cells
Connective

19. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental sac
Dentin and alveolar bone
May be confused as calculus deposit on root

20. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Sphere of enamel on root
Tooth germ
The basement membrane

21. What is the time span for the bud stage?
Compressed layer of flat to cuboidal cells
8th week
4 types
Bud stage

22. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The cervical loop
Initiation stage
Tall columnar cells

23. What are the major components of the tooth germ?
Common on permanent molars or cingulum of anterior 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
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The enamel organ - dental papilla - dental sac

24. What will the dental papilla eventually form?
The enamel organ is compressed
Future dentin and pulp tissue
4 types
Alveolar bone

25. The oral epithelium is induced by the ectomesenchyme to produce what?
9th to 10th weeks
The dental sac
The dental lamina
Faulty development of enamel from interference involving ameloblasts

26. What are the clinical ramifications of fusion?
Traumatic injury or crowding of teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane
The ectomesenchyme

27. What happens during the bell stage?
Dental tissues fully mineralize to their mature levels.
The enamel organ - dental papilla - dental sac
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.
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

28. What are the odontoblastic processes is contained in what?
The cementum - PDL - and alveolar bone
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Morphogenesis
A mineralized cylinder - the dentinal tubule

29. What are the formative cells for enamel?
Preameloblasts
Ameloblasts
6th to 7th weeks
Differentiation - proliferation - morphogenesis

30. What is cementogenisis?
Apposition of the cementum
During the cap stage
The bud 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.

31. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
When the gingiva recedes and no actual tooth movement takes place
The outer cells of the dental papilla and the central cells of the dental papilla
Odontoblastic process
Inner

32. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Oral epithelium
Tooth germ
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

33. 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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
8th week
Local or systemic or hereditary

34. 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
4 types
Initiation stage
9th to 10th weeks

35. What hard tissue is innervated by nerves?
Dentin and alveolar bone
The stellate reticulum
Cementoblasts
Morphogenesis

36. When does dens in dente occur?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
During the cap stage
Apposition of the cementum
9th to 10th weeks

37. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental tissues secreted as matrix in successive layers.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The bud stage

38. What is the outer portion of the ectoderm in the initiation stage?
As a result of the apposition of cementum over dentin
Oral epithelium
Only dentinal tubules with processes
The bud stage

39. What is gemination?
Tall columnar cells
The ameloblasts
Tooth germ tries to divide
Induction

40. What is the site for the future dentioenamel junction?
The cervical loop
The basement membrane that seperates the enamel organ and dental papilla
The dental sac
There are none - they are lost with eruption

41. What are the etiological factors for anodontia?
Maturation
The apposition of the enamel matrix
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary

42. What is the predominate process of the cap stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Abnormally small teeth
Morphogenesis
The ectomesenchyme

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

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44. The stellate reticulum is located inner or outer?
Outer
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Abnormally large teeth
Induction - proliferation

45. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Common on permanent molars or cingulum of anterior teeth
Dental papilla
Tooth germ tries to divide
It disintegrates as the developing oral mucosa comes to line the oral cavity

46. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Hereditary
Epithelial rests of Malassez
Preameloblasts
Pressure on the area

47. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Cementoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectomesenchyme

48. When does the process of root development take place?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Induction
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

49. What is the main process involved in initiation?
Abnormally large teeth
Traumatic injury or crowding of teeth
The dental sac
Induction

50. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Abnormally small teeth
The ameloblasts
Pressure on the area
Only dentinal tubules with processes