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

2. What are the cell layers found in the enamel organ in the bell stage?
In the cap stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The primordium of the pulp
Tall columnar cells

3. What are the formative cells for alveolar bone?
Osteoblasts
Induction
Initiation stage
Trauma - pressure or metabolic disease

4. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Epithelial rests of Malassez
4 types
The outer cells of the dental papilla and the central cells of the dental papilla

5. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Proliferation - differentiation - morphogenesis
The bud stage
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 bilayer rim that consists only IEE and OEE

6. What are supernumerary teeth?
Bud stage
In the cap stage
Into odontoblasts
Development of one or more extra teeth

7. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Trauma - pressure or metabolic disease
The enamel organ
Alveolar bone

8. Where does the primordium of the permanent dentition develop?
Dental papilla
Differentiation
Commonly involves permanent maxillary lateral incisor and 3rd molars
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

9. What are the mature cells for cementum?
Tooth germ tries to divide
Cementocytes
Displacement of ameloblasts to root surface
The enamel - dentin - and cementum are secreted in successive layers

10. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
May be confused as calculus deposit on root
Cuboidal cells
Inner

11. What is the predominate process in the bell stage?
Differentiation
In the cap stage
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

12. What is the time span for the bud stage?
Cementoid
The enamel organ
8th week
Epithelial

13. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Enamel
4 types
Dental follicle

14. Where is the dental sac originally derived from?
6th to 7th weeks
Preameloblasts
The ectomesenchyme
In the cap stage

15. What is the time span for initiation?
The basement membrane that seperates the enamel organ and dental papilla
6th to 7th weeks
Differentiation - proliferation - morphogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

16. What layer serves as protection for the enamel organ?
The ectomesenchyme
Into odontoblasts
The outer enamel epithelium
Enamel organ invaginates into the dental papilla

17. The stellate reticulum is located inner or outer?
Outer
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

18. What are the formative cells for enamel?
The ectomesenchyme
Ameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
When the gingiva recedes and no actual tooth movement takes place

19. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Cementocytes
Tooth germ
11th to 12th weeks

20. Active eruption
Differentiation
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
The actual vertical movement of the tooth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

21. Passive eruption
Odontogenesis
When the gingiva recedes and no actual tooth movement takes place
The basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

22. What are the clinical ramifications of gemination?

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23. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Maturation
Enamel organ invaginates into the dental papilla
Extra cusp due to effects on enamel organ

24. When does dens in dente occur?
Osteocytes
During the cap stage
Maturation
Cuboidal cells

25. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Maturation
Abnormally large teeth
Preameloblasts

26. What will the dental papilla eventually form?
Enamel pearl - enamel dysplasia - and concresence
The tooth germ
Future dentin and pulp tissue
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

27. What is the site for the future dentioenamel junction?
The ectomesenchyme - which was influenced by the neural crest cells
Oral epithelium
The basement membrane that seperates the enamel organ and dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

28. What hard tissue has vascularity?
Pressure on the area
Absence of single or multiple teeth
Enamel
Alveolar bone

29. What are the etiological factors of concrescence?
Epithelial rests of Malassez
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.
Traumatic injury or crowding of teeth
Dentin secreting cells (odontoblats)

30. What is macrodontia?
A mineralized cylinder - the dentinal tubule
Abnormally large teeth
Pressure on the area
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. What happens during the bell stage?
The enamel organ is compressed
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental sac
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

32. What type of tissue is enamel?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Osteocytes
Epithelial
Dental tissues fully mineralize to their mature levels.

33. What is the predominate process of the cap stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Oral epithelium
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Morphogenesis

34. Which layer in the bell stage has star shaped cells?
Common on permanent molars or cingulum of anterior teeth
6th to 7th weeks
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The stellate reticulum

35. What are the incremental lines for dentin?
Common on permanent molars or cingulum of anterior teeth
A mineralized cylinder - the dentinal tubule
Imbrication lines of von Ebner
During the cap stage

36. When does macro/microdontia occur?
Union of root structure of two or more teeth by cementum
Bud stage
The ectomesenchyme
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.

37. The preameloblasts induce dental papilla cells to differentiate into what?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Connective
Into odontoblasts
Dentin secreting cells (odontoblats)

38. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Union of root structure of two or more teeth by cementum
Differentiation
There are none - they are lost with eruption

39. When does the tooth bud become a tooth germ?
During the cap stage
Connective
In the cap stage
The ectomesenchyme

40. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Dental papilla
Enamel organ invaginates into the dental papilla
The ameloblasts
Initiation

41. What is the primordium of the tooth?
Dentin secreting cells (odontoblats)
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
4 types
The tooth germ

42. What hard tissue is can not have tissue formation after eruption?
Enamel
Dental papilla
Tooth germ tries to divide
The tooth germ

43. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Enamel organ
Osteoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

44. How is the reduced enamel epithelium created?
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
May be confused as calculus deposit on root
Odontogenesis
The enamel organ is compressed

45. 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.
Compressed layer of flat to cuboidal cells
Enamel pearl - enamel dysplasia - and concresence
Induction - proliferation

46. What are the etiological factors for enamel pearl?
Odontoblastic process
Alveolar bone
Displacement of ameloblasts to root surface
Compressed layer of flat to cuboidal cells

47. What are the etiological factors for dens in dente and gemination?
Ameloblasts
Differentiation
Hereditary
Extra cusp due to effects on enamel organ

48. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Compressed layer of flat to cuboidal cells
Local or systemic or hereditary
Dental tissues fully mineralize to their mature levels.

49. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontoclasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

50. What are the clinical ramifications of supernumerary teeth?
There are none - they are lost with eruption
The enamel - dentin - and cementum are secreted in successive layers
Common with permanent maxillary molars
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion