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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 are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Differentiation
Absence of single or multiple teeth
Induction - proliferation

2. What is the main process involved in initiation?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Absence of single or multiple teeth
Induction
Ameloblasts

3. What is the cap in the cap stage?
Enamel organ
The bud stage
The enamel organ
When the gingiva recedes and no actual tooth movement takes place

4. What wll the inner enamel epithelium differentiate into?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Enamel secreting cells (ameloblasts)
The outer cells of the dental papilla and the central cells of the dental papilla
The primordium of the pulp

5. 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
Into odontoblasts
Enamel organ invaginates into the dental papilla
Dental papilla

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

7. What is the embryological background for enamel?
May be confused as calculus deposit on root
4 types
Epithelial
Enamel organ

8. What is enamel dysplasia?
The enamel organ
Faulty development of enamel from interference involving ameloblasts
The basement membrane
The ameloblasts

9. What is anodontia?
Connective
Absence of single or multiple teeth
Dentin secreting cells (odontoblats)
Hereditary

10. Do odontoblasts start their secretion of matrix before the ameloblasts?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
When the gingiva recedes and no actual tooth movement takes place
Enamel pearl - enamel dysplasia - and concresence

11. What is the outer portion of the ectoderm in the initiation stage?
The tooth germ
Absence of single or multiple teeth
Dental tissues fully mineralize to their mature levels.
Oral epithelium

12. What do the odontoblasts do?
Tall columnar cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Union of root structure of two or more teeth by cementum

13. How many types of cells are found in the enamel organ in the bell stage?
4 types
Differentiation
Cuboidal cells
Tall columnar cells

14. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
The enamel organ
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.
Absence of single or multiple teeth

15. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Morphogenesis
The ameloblasts
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.
Enamel pearl - enamel dysplasia - and concresence

16. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The apposition of the enamel matrix
Cementoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

17. What is the predominate process of the cap stage?
Maturation
Morphogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Differentiation - proliferation - morphogenesis

18. What are the mature cells for cementum?
Cementocytes
Commonly involves permanent maxillary lateral incisor and 3rd molars
As a result of the apposition of cementum over dentin
Lines of Retzuis

19. Where is the enamal organ originally derived from?
Traumatic injury or crowding of teeth
The ectoderm
Alveolar bone
Maturation

20. How is the reduced enamel epithelium created?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Maturation
The enamel organ is compressed
Odontoblastic process

21. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
The basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel pearl - enamel dysplasia - and concresence

22. When does dens in dente occur?
Induction - proliferation
During the cap stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

23. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
The apposition of the enamel matrix
The stellate reticulum
Differentiation - proliferation - morphogenesis

24. What stage does the dental tissues subsequently fully mineralize
Maturation
Dental tissues secreted as matrix in successive layers.
The basement membrane
Bud stage

25. The stratum intermediate is located inner or outer?
8th week
Development of one or more extra teeth
The enamel - dentin - and cementum are secreted in successive layers
Inner

26. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Epithelial
Cementocytes
8th week

27. What type of tissue is dentin - cementum - and alveolar bone?
8th week
There are none - they are lost with eruption
Connective
Inner

28. What are the incremental lines for dentin?
Imbrication lines of von Ebner
9th to 10th weeks
Dental tissues secreted as matrix in successive layers.
Compressed layer of flat to cuboidal cells

29. What are the odontoblastic processes is contained in what?
The cervical loop
A mineralized cylinder - the dentinal tubule
Arrest and reversal lines
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

30. What are the etiological factors for fusion?
Pressure on the area
Into odontoblasts
Displacement of ameloblasts to root surface
The basement membrane

31. What are the mature cells for enamel?
The basement membrane
Trauma - pressure or metabolic disease
There are none - they are lost with eruption
Odontoclasts

32. What happens during the bell stage?
Displacement of ameloblasts to root surface
Oral epithelium
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontoclasts

33. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Odontoblastic process
The ectomesenchyme
Tooth germ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

34. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Common with permanent maxillary molars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

35. What is matrix?
Alveolar bone
The ectomesenchyme
The outer enamel epithelium
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

36. What are the clinical ramifications of supernumerary 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
The enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla

37. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
A bilayer rim that consists only IEE and OEE
The ectomesenchyme - which was influenced by the neural crest cells
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

38. Active eruption
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The cervical loop
The actual vertical movement of the tooth
Enamel organ

39. 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
Dental follicle
Cementocytes
Dentin and alveolar bone

40. What are the clinical ramifications?
Dental tissues secreted as matrix in successive layers.
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Common on permanent molars or cingulum of anterior teeth
Union of root structure of two or more teeth by cementum

41. What is the structure responsible for root development?
Extra cusp due to effects on enamel organ
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
The cervical loop

42. What hard tissue is innervated by nerves?
Differentiation - proliferation - morphogenesis
Dentin and alveolar bone
Differentiation
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

43. What is the time span for the cap stage?
Common with permanent maxillary molars
Differentiation
9th to 10th weeks
8th week

44. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Tall columnar cells
Osteoblasts
8th week

45. What else undergoes proliferation in the bud stage besides the dental lamina?
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.
The ectomesenchyme
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

46. What happens during the appositional stage?
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 enamel - dentin - and cementum are secreted in successive layers
The stellate reticulum
Initiation

47. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Proliferation
The ectomesenchyme - which was influenced by the neural crest cells
A mineralized cylinder - the dentinal tubule
The basement membrane

48. What is tubercle?
Extra cusp due to effects on enamel organ
Dental tissues secreted as matrix in successive layers.
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.
Epithelial rests of Malassez

49. Which layer in the bell stage has star shaped cells?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The stellate reticulum
There is unequal growth in different parts of the tooth bud
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

50. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Faulty development of enamel from interference involving ameloblasts
Future dentin and pulp tissue
11th to 12th weeks