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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. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The enamel organ
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
A mineralized cylinder - the dentinal tubule

2. Which layer in the bell stage has star shaped cells?
Local or systemic or hereditary
The enamel - dentin - and cementum are secreted in successive layers
The stellate reticulum
The enamel organ is compressed

3. What kind of cells occur in the outer enamel epithelium in the bell stage?
Dental papilla
Cuboidal cells
Maturation
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

4. What will the dental papilla eventually form?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The permanent molars
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Future dentin and pulp tissue

5. What is the function of the Hertwig's epithelial root sheath?
Osteocytes
Commonly involves permanent maxillary lateral incisor and 3rd molars
The tooth germ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

6. What are the etiological factors of concrescence?
The dental lamina
Traumatic injury or crowding of teeth
Initiation
There is unequal growth in different parts of the tooth bud

7. What wll the inner enamel epithelium differentiate into?
Dental tissues fully mineralize to their mature levels.
In the cap stage
Odontoclasts
Enamel secreting cells (ameloblasts)

8. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Dental papilla
A bilayer rim that consists only IEE and OEE
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental sac

9. What is the embryological background for enamel?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Development of one or more extra teeth
The outer cells of the dental papilla and the central cells of the dental papilla
Enamel organ

10. What are the etiological factors for fusion?
Trauma - pressure or metabolic disease
Epithelial
Pressure on the area
Hereditary

11. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Compressed layer of flat to cuboidal cells
The ameloblasts
The enamel organ is compressed

12. What are the incremental lines for dentin?
Dens in dente - gemination - tubercle - and fusion
The dental sac
Enamel organ invaginates into the dental papilla
Imbrication lines of von Ebner

13. Tooth development
Odontogenesis
Dental tissues fully mineralize to their mature levels.
Hereditary
Inner

14. What is the embryological background for dentin - cementum and alveolar bone?
11th to 12th weeks
The enamel - dentin - and cementum are secreted in successive layers
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental papilla

15. What are the clinical ramifications of supernumerary teeth?
Tooth germ tries to divide
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Pressure on the area
Enamel pearl - enamel dysplasia - and concresence

16. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Initiation
Differentiation
Alveolar bone
Epithelial rests of Malassez

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

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18. What is the predominate process of the cap stage?
Morphogenesis
A bilayer rim that consists only IEE and OEE
Abnormally small teeth
6th to 7th weeks

19. What are supernumerary teeth?
Cementoid
Union of 2 adjacent tooth germs
Dental papilla
Development of one or more extra teeth

20. What are succedaneous teeth?
Cementoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Faulty development of enamel from interference involving ameloblasts
As a result of the apposition of cementum over dentin

21. What are the mature cells for enamel?
Differentiation - proliferation - morphogenesis
Displacement of ameloblasts to root surface
There are none - they are lost with eruption
Faulty development of enamel from interference involving ameloblasts

22. The preameloblasts induce dental papilla cells to differentiate into what?
11th to 12th weeks
Into odontoblasts
The dental sac
A bilayer rim that consists only IEE and OEE

23. What is anodontia?
Differentiation - proliferation - morphogenesis
Union of root structure of two or more teeth by cementum
The dental lamina
Absence of single or multiple teeth

24. When does the tooth bud become a tooth germ?
Compressed layer of flat to cuboidal cells
In the cap stage
Dental follicle
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

25. What happens when the reduced enamel epithelium is created?
Hereditary
Epithelial rests of Malassez
Proliferation
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. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Connective
Faulty development of enamel from interference involving ameloblasts
Dental tissues fully mineralize to their mature levels.

27. What are the formative cells for enamel?
Dentin secreting cells (odontoblats)
Ameloblasts
The bud stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

28. What is tubercle?
Dentin and alveolar bone
Extra cusp due to effects on enamel organ
Proliferation - differentiation - morphogenesis
The outer cells of the dental papilla and the central cells of the dental papilla

29. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Epithelial rests of Malassez
The bud stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
8th week

30. What are the clinical ramifications of fusion?
Future dentin and pulp tissue
The stellate reticulum
Induction
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

31. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Proliferation - differentiation - morphogenesis
Tall columnar cells
Dens in dente - gemination - tubercle - and fusion

32. What hard tissue is can not have tissue formation after eruption?
Enamel
Dentin secreting cells (odontoblats)
The tooth germ
Abnormally small teeth

33. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla
Common on permanent molars or cingulum of anterior teeth
Dental tissues fully mineralize to their mature levels.

34. What will the outer cells of the dental lamina differentiate into?
Faulty development of enamel from interference involving ameloblasts
Dentin secreting cells (odontoblats)
Hereditary in localized form. endocrine dysfunction is complete
Extra cusp due to effects on enamel organ

35. What is dens in dente?
Enamel organ invaginates into the dental papilla
The enamel organ
Local or systemic or hereditary
The apposition of the enamel matrix

36. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
In the cap stage
When the gingiva recedes and no actual tooth movement takes place
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

37. What happens during the appositional stage?
A mineralized cylinder - the dentinal tubule
Maturation
The enamel - dentin - and cementum are secreted in successive layers
Odontoclasts

38. What are the etiological factors for enamel pearl?
Initiation stage
Dental tissues secreted as matrix in successive layers.
Displacement of ameloblasts to root surface
The dental sac

39. The stratum intermediate is located inner or outer?
Osteocytes
Commonly involves permanent maxillary lateral incisor and 3rd molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Inner

40. What are the mature cells for dentin?
Epithelial
Faulty development of enamel from interference involving ameloblasts
Only dentinal tubules with processes
The dental sac

41. What are the clinical ramifications of gemination?

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42. What are the clinical ramifications of anodontia?
Dental tissues fully mineralize to their mature levels.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
In the cap stage
Abnormally small teeth

43. What is the time span for the bell stage?
The basement membrane
The dental lamina
11th to 12th weeks
Osteocytes

44. What are the clinical ramifications of concrescence?
Pressure on the area
Common with permanent maxillary molars
The basement membrane
Absence of single or multiple teeth

45. What are the formative cells for cementum?
The ectomesenchyme
Cementoblasts
Dens in dente - gemination - tubercle - and fusion
Enamel organ

46. 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
Initiation stage
Enamel organ invaginates into the dental papilla
Displacement of ameloblasts to root surface

47. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Hereditary
Enamel
Displacement of ameloblasts to root surface

48. What is concrescence?
Hereditary
Union of root structure of two or more teeth by cementum
The ameloblasts
Enamel pearl - enamel dysplasia - and concresence

49. What are the incremental lines for enamel?
The enamel - dentin - and cementum are secreted in successive layers
Lines of Retzuis
Cementoblasts
Union of 2 adjacent tooth germs

50. How many types of cells are found in the enamel organ in the bell stage?
Pressure on the area
Odontoblastic process
Epithelial rests of Malassez
4 types