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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 initiation?
The basement membrane
The ectomesenchyme
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 follicle

2. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Alveolar bone
Odontoclasts
Faulty development of enamel from interference involving ameloblasts
Odontoblasts

3. What is the main process involved in the bud stage?
Faulty development of enamel from interference involving ameloblasts
Proliferation
Imbrication lines of von Ebner
Outer

4. What stage does supernumerary teeth occur?
Cuboidal cells
Alveolar bone
Initiation
Dentin secreting cells (odontoblats)

5. What are the incremental lines for dentin?
Ameloblasts
Imbrication lines of von Ebner
Osteoblasts
Faulty development of enamel from interference involving ameloblasts

6. What are the clinical ramifications of concrescence?
9th to 10th weeks
Only dentinal tubules with processes
Common with permanent maxillary molars
Dental tissues secreted as matrix in successive layers.

7. What type of tissue is dentin - cementum - and alveolar bone?
Common with permanent maxillary molars
Cementoblasts
May be confused as calculus deposit on root
Connective

8. What is matrix?
May be confused as calculus deposit on root
Abnormally small teeth
Differentiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

9. What are the formative cells for alveolar bone?
Osteoblasts
Future dentin and pulp tissue
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Maturation

10. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dentin secreting cells (odontoblats)
Odontoblastic process
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity

11. What are the clinical ramifications of enamel pearl?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectomesenchyme
May be confused as calculus deposit on root
Displacement of ameloblasts to root surface

12. What will the dental sac give rise to?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Traumatic injury or crowding of teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The cementum - PDL - and alveolar bone

13. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Hereditary in localized form. endocrine dysfunction is complete
Tooth germ

14. What is the cementum matrix called?
Odontoblasts
Cementoid
8th week
Alveolar bone

15. In the cap stage the tooth bud does not grow - what happens?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
There is unequal growth in different parts of the tooth bud
Sphere of enamel on root
Maturation

16. What hard tissue is can not have tissue formation after eruption?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Epithelial rests of Malassez
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel

17. What processes are involved in the bell stage?
The actual vertical movement of the tooth
Differentiation - proliferation - morphogenesis
During the cap stage
When the gingiva recedes and no actual tooth movement takes place

18. What hard tissue is innervated by nerves?
The enamel organ - dental papilla - dental sac
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
Dentin and alveolar bone
Union of 2 adjacent tooth germs

19. The oral epithelium is induced by the ectomesenchyme to produce what?
Maturation
Dental papilla
The dental lamina
Dental papilla

20. What are the major components of the tooth germ?
Dental tissues secreted as matrix in successive layers.
The ectomesenchyme
The enamel organ - dental papilla - dental sac
4 types

21. What are the clinical ramifications of gemination?

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22. What is the time span for the bell stage?
Odontoclasts
11th to 12th weeks
Maturation
Faulty development of enamel from interference involving ameloblasts

23. What are the formative cells for dentin?
Hereditary in localized form. endocrine dysfunction is complete
The permanent molars
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
Odontoblasts

24. What happens during the bell stage?
Dental tissues fully mineralize to their mature levels.
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

25. What are the clinical ramifications of dens in dente?
The ectomesenchyme - which was influenced by the neural crest cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial rests of Malassez
Bud stage

26. How is the dentinocemental junction formed?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
As a result of the apposition of cementum over dentin
Local or systemic or hereditary
The ectoderm

27. What happens during the maturation stage?
Cementoblasts
There are none - they are lost with eruption
Dental tissues fully mineralize to their mature levels.
Common on permanent molars or cingulum of anterior teeth

28. What kind of cells reside in the stratum intermediate?
Abnormally small teeth
Compressed layer of flat to cuboidal cells
Tooth germ
11th to 12th weeks

29. What is amelogenisis?
Osteoblasts
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
The apposition of the enamel matrix

30. What are the odontoblastic processes is contained in what?
The ectomesenchyme
Tooth germ tries to divide
9th to 10th weeks
A mineralized cylinder - the dentinal tubule

31. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Future dentin and pulp tissue
Enamel pearl - enamel dysplasia - and concresence
Dental papilla
Apposition of the cementum

32. Where does the primordium of the permanent dentition develop?
Alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The dental sac
Differentiation - proliferation - morphogenesis

33. What is tubercle?
Abnormally small teeth
Dental papilla
Extra cusp due to effects on enamel organ
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

34. What are the mature cells for alveolar bone?
Osteocytes
Dental papilla
May be confused as calculus deposit on root
The enamel organ - dental papilla - dental sac

35. Active eruption
The actual vertical movement of the tooth
Dentin and alveolar bone
Inner
Tooth germ tries to divide

36. What are supernumerary teeth?
Tooth germ tries to divide
11th to 12th weeks
Development of one or more extra teeth
The ectomesenchyme - which was influenced by the neural crest cells

37. Passive eruption
Proliferation
Future dentin and pulp tissue
Proliferation - differentiation - morphogenesis
When the gingiva recedes and no actual tooth movement takes place

38. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
6th to 7th weeks
Faulty development of enamel from interference involving ameloblasts
The dental sac
The ameloblasts place an acellular dental cuticle on the new enamel surface

39. When does macro/microdontia occur?
Proliferation - differentiation - morphogenesis
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Absence of single or multiple teeth
Bud stage

40. How is the reduced enamel epithelium created?
Absence of single or multiple teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Sphere of enamel on root
The enamel organ is compressed

41. What is the process involved in the maturation stage?
Hereditary in localized form. endocrine dysfunction is complete
Cementoblasts
Maturation
Abnormally small teeth

42. The stellate reticulum is located inner or outer?
The enamel - dentin - and cementum are secreted in successive layers
Dental papilla
Lines of Retzuis
Outer

43. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Odontoblasts
Tooth germ tries to divide
Enamel organ

44. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The ameloblasts place an acellular dental cuticle on the new enamel surface
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 basement membrane
The enamel organ

45. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
8th week
Union of 2 adjacent tooth germs
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

46. The stratum intermediate is located inner or outer?
Ameloblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The basement membrane
Inner

47. What is the embryological background for dentin - cementum and alveolar bone?
Morphogenesis
Dental papilla
Pressure on the area
Epithelial rests of Malassez

48. What layer serves as protection for the enamel organ?
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
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The outer enamel epithelium
Epithelial rests of Malassez

49. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontoblastic process
Tooth germ tries to divide
The basement membrane

50. What are the mature cells for dentin?
Dental tissues fully mineralize to their mature levels.
Only dentinal tubules with processes
Future dentin and pulp tissue
The cervical loop