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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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1. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
When the gingiva recedes and no actual tooth movement takes place
Faulty development of enamel from interference involving ameloblasts
Odontoclasts

2. What is the cementum matrix called?
Cementoid
The basement membrane
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ameloblasts

3. The stratum intermediate is located inner or outer?
Union of 2 adjacent tooth germs
Inner
It disintegrates as the developing oral mucosa comes to line the oral cavity
The apposition of the enamel matrix

4. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Compressed layer of flat to cuboidal cells
The outer cells of the dental papilla and the central cells of the dental papilla
The bud stage
Development of one or more extra teeth

5. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
6th to 7th weeks
The basement membrane
Extra cusp due to effects on enamel organ
Cementoblasts

6. What kind of cells occur in the outer enamel epithelium in the bell stage?
There is unequal growth in different parts of the tooth bud
The ectomesenchyme
Cuboidal cells
Enamel pearl - enamel dysplasia - and concresence

7. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Apposition of the cementum
Enamel pearl - enamel dysplasia - and concresence
Commonly involves permanent maxillary lateral incisor and 3rd molars

8. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementoblasts
Tooth germ

9. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
May be confused as calculus deposit on root
A bilayer rim that consists only IEE and OEE
Odontoblastic process
6th to 7th weeks

10. What will the outer cells of the dental lamina differentiate into?
Tooth germ
Dentin secreting cells (odontoblats)
Dental tissues fully mineralize to their mature levels.
The enamel organ - dental papilla - dental sac

11. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dental tissues secreted as matrix in successive layers.
It disintegrates as the developing oral mucosa comes to line the oral cavity
Morphogenesis
Odontoblasts

12. What are the cell layers found in the enamel organ in the bell stage?
The primordium of the pulp
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Epithelial
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

13. What are the clinical ramifications of dens in dente?
Odontoblasts
Faulty development of enamel from interference involving ameloblasts
Dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

14. What are the mature cells for enamel?
The primordium of the pulp
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Induction
There are none - they are lost with eruption

15. What are the clinical ramifications of supernumerary teeth?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
9th to 10th weeks
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Preameloblasts

16. What else undergoes proliferation in the bud stage besides the dental lamina?
As a result of the apposition of cementum over dentin
The tooth germ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme

17. What are the development disturbances of the apposition and maturation stages?
Cementocytes
Enamel pearl - enamel dysplasia - and concresence
Induction
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

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

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19. What are the etiological factors for fusion?
The cementum - PDL - and alveolar bone
Pressure on the area
Outer
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

20. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Alveolar bone
Enamel
Dental papilla
Cementoid

21. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
The dental lamina
The ameloblasts
Development of one or more extra teeth

22. What wll the inner enamel epithelium differentiate into?
Trauma - pressure or metabolic disease
9th to 10th weeks
Initiation
Enamel secreting cells (ameloblasts)

23. What are the clinical ramifications of enamel pearl?
9th to 10th weeks
May be confused as calculus deposit on root
In the cap stage
Lines of Retzuis

24. What are the incremental lines for enamel?
Enamel secreting cells (ameloblasts)
Lines of Retzuis
Enamel organ invaginates into the dental papilla
Enamel

25. What are the incremental lines for dentin?
Dentin and alveolar bone
Dental tissues fully mineralize to their mature levels.
Imbrication lines of von Ebner
Enamel secreting cells (ameloblasts)

26. The preameloblasts induce dental papilla cells to differentiate into what?
The apposition of the enamel matrix
Into odontoblasts
Sphere of enamel on root
Tooth germ

27. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Apposition of the cementum
Enamel organ
Extra cusp due to effects on enamel organ

28. What are the etiological factors for supernumerary teeth?
Differentiation
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
Epithelial
Hereditary

29. What hard tissue is can not have tissue formation after eruption?
Only dentinal tubules with processes
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
A bilayer rim that consists only IEE and OEE
Enamel

30. What are the etiological factors for dens in dente and gemination?
Tooth germ
Hereditary
Dental follicle
Dental tissues secreted as matrix in successive layers.

31. What are the formative cells for alveolar bone?
Epithelial
Osteoblasts
Common with permanent maxillary molars
Dental tissues fully mineralize to their mature levels.

32. What is the time span for the bell stage?
Faulty development of enamel from interference involving ameloblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
11th to 12th weeks
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

33. Which layer in the bell stage has star shaped cells?
Apposition of the cementum
The dental lamina
Differentiation
The stellate reticulum

34. What is the main process involved in initiation?
Induction
Dental tissues fully mineralize to their mature levels.
The basement membrane
As a result of the apposition of cementum over dentin

35. What is microdontia?
The dental sac
Abnormally small teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The primordium of the pulp

36. What is enamel dysplasia?
As a result of the apposition of cementum over dentin
Lines of Retzuis
Faulty development of enamel from interference involving ameloblasts
Hereditary in localized form. endocrine dysfunction is complete

37. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
The stellate reticulum
Dentin and alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

38. What type of tissue is enamel?
The enamel organ is compressed
The ectomesenchyme
Epithelial
The basement membrane

39. What type of tissue is dentin - cementum - and alveolar bone?
Connective
The bud stage
As a result of the apposition of cementum over dentin
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

40. What hard tissue has vascularity?
Enamel pearl - enamel dysplasia - and concresence
Union of root structure of two or more teeth by cementum
Cementoblasts
Alveolar bone

41. What processes are involved with the apposition stage?
The outer enamel epithelium
Lines of Retzuis
Induction - proliferation
Common on permanent molars or cingulum of anterior teeth

42. What stage does supernumerary teeth occur?
Initiation
Union of 2 adjacent tooth germs
A mineralized cylinder - the dentinal tubule
The bud stage

43. What will the inner cells of the dental lamina differentiates into?
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.
Lines of Retzuis
The primordium of the pulp
The ectomesenchyme

44. What are the mature cells for cementum?
The enamel organ
Cementocytes
Induction - proliferation
Union of 2 adjacent tooth germs

45. What is dens in dente?
Enamel organ invaginates into the dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
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
Lines of Retzuis

46. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Compressed layer of flat to cuboidal cells
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
Dental papilla
Tooth germ

47. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Future dentin and pulp tissue
The enamel organ is compressed
Commonly involves permanent maxillary lateral incisor and 3rd molars

48. When does the process of root development take place?
Enamel pearl - enamel dysplasia - and concresence
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ - dental papilla - dental sac
Extra cusp due to effects on enamel organ

49. What are the incremental lines for cementum and alveolar bone?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Arrest and reversal lines
There are none - they are lost with eruption
The enamel organ

50. What is the cap in the cap stage?
Compressed layer of flat to cuboidal cells
The enamel organ
The cementum - PDL - and alveolar bone
The outer enamel epithelium

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Dentistry Tooth Development And Eruption

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