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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 etiological factors for enamel pearl?
The dental sac
Displacement of ameloblasts to root surface
The stellate reticulum
The dental lamina

2. What is gemination?
Tooth germ tries to divide
Enamel secreting cells (ameloblasts)
8th week
It disintegrates as the developing oral mucosa comes to line the oral cavity

3. The stratum intermediate is located inner or outer?
Inner
The dental lamina
The ectoderm
Induction - proliferation

4. What are the clinical ramifications?
Cementocytes
Proliferation - differentiation - morphogenesis
Common on permanent molars or cingulum of anterior teeth
Enamel organ

5. Which teeth are nonsuccedaneous?
The permanent molars
Cementocytes
Odontoblasts
The basement membrane

6. What are the odontoblastic processes is contained in what?
The outer cells of the dental papilla and the central cells of the dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dens in dente - gemination - tubercle - and fusion
A mineralized cylinder - the dentinal tubule

7. What is macrodontia?
Abnormally large teeth
Displacement of ameloblasts to root surface
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
There is unequal growth in different parts of the tooth bud

8. What kind of cells occur in the inner enamel epithelium?
Dentin secreting cells (odontoblats)
Connective
There is unequal growth in different parts of the tooth bud
Tall columnar cells

9. What are the mature cells for enamel?
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.
There are none - they are lost with eruption
Abnormally small teeth
Cementocytes

10. What stage does the dental tissues subsequently fully mineralize
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Maturation
Bud stage
As a result of the apposition of cementum over dentin

11. What processes are involved with the apposition stage?
Pressure on the area
Cementocytes
Proliferation
Induction - proliferation

12. What are entrapped cementoblasts called?
In the cap stage
Cementocytes
Dental follicle
Osteocytes

13. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Dental papilla
Tall columnar cells
The apposition of the enamel matrix

14. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
It disintegrates as the developing oral mucosa comes to line the oral cavity
The tooth germ
Induction - proliferation

15. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
There are none - they are lost with eruption
The enamel organ - dental papilla - dental sac
When the gingiva recedes and no actual tooth movement takes place
Tooth germ

16. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The enamel - dentin - and cementum are secreted in successive layers
Odontoclasts
Into odontoblasts
Enamel secreting cells (ameloblasts)

17. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
Traumatic injury or crowding of teeth
The permanent molars
The tooth germ

18. What will the dental papilla eventually form?
Traumatic injury or crowding of teeth
Future dentin and pulp tissue
The ectomesenchyme
Hereditary in localized form. endocrine dysfunction is complete

19. What is the time span for the bud stage?
8th week
Common on permanent molars or cingulum of anterior teeth
Displacement of ameloblasts to root surface
The bud stage

20. What are the incremental lines for cementum and alveolar bone?
Tooth germ tries to divide
Arrest and reversal lines
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ectoderm

21. What do the odontoblasts do?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel organ
Initiation

22. How many types of cells are found in the enamel organ in the bell stage?
The ectomesenchyme - which was influenced by the neural crest cells
Osteoblasts
4 types
Maturation

23. What are the clinical ramifications of supernumerary teeth?
Union of 2 adjacent tooth germs
Dental papilla
Dental papilla
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

24. What are the development disturbances of the apposition and maturation stages?
Induction
Differentiation - proliferation - morphogenesis
The basement membrane
Enamel pearl - enamel dysplasia - and concresence

25. When does the tooth bud become a tooth germ?
The dental lamina
As a result of the apposition of cementum over dentin
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
In the cap stage

26. What is the embryological background for enamel?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The stellate reticulum
There are none - they are lost with eruption
Enamel organ

27. Tooth development
Odontogenesis
Initiation
Bud stage
Trauma - pressure or metabolic disease

28. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Common with permanent maxillary molars
Differentiation
Traumatic injury or crowding of teeth
Dental papilla

29. What type of tissue is dentin - cementum - and alveolar bone?
A mineralized cylinder - the dentinal tubule
Morphogenesis
Connective
Proliferation

30. When does the process of root development take place?
The outer cells of the dental papilla and the central cells of the dental papilla
Imbrication lines of von Ebner
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction - proliferation

31. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
9th to 10th weeks
The basement membrane
Dentin secreting cells (odontoblats)
Maturation

32. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Bud stage
Tooth germ tries to divide

33. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Tooth germ tries to divide
Proliferation - differentiation - morphogenesis
Enamel pearl - enamel dysplasia - and concresence

34. What kind of cells occur in the outer enamel epithelium in the bell stage?
The enamel organ - dental papilla - dental sac
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental tissues secreted as matrix in successive layers.
Cuboidal cells

35. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Odontoblastic process
11th to 12th weeks
Maturation

36. What will the outer cells of the dental lamina differentiate into?
Apposition of the cementum
Hereditary
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dentin secreting cells (odontoblats)

37. What is the cap in the cap stage?
Cuboidal cells
The primordium of the pulp
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.

38. What are the etiological factors for micro/macrodontia?
Initiation stage
The enamel organ is compressed
Hereditary in localized form. endocrine dysfunction is complete
8th week

39. Where is the dental sac originally derived from?
Imbrication lines of von Ebner
The ectomesenchyme
The basement membrane
The stellate reticulum

40. What is microdontia?
Abnormally small teeth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentin and alveolar bone
Enamel organ

41. What are the formative cells for cementum?
Odontogenesis
Cementoblasts
There are none - they are lost with eruption
Into odontoblasts

42. What are the formative cells for dentin?
There are none - they are lost with eruption
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontoblasts
The enamel organ - dental papilla - dental sac

43. What happens during initiation?
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
Outer
Enamel pearl - enamel dysplasia - and concresence
In the cap stage

44. What are the clinical ramifications of dens in dente?
The cervical loop
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
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Morphogenesis

45. When does macro/microdontia occur?
9th to 10th weeks
Bud stage
The outer enamel epithelium
Initiation stage

46. What are supernumerary teeth?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel organ
Development of one or more extra teeth
Outer

47. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
The dental sac
Induction
Epithelial

48. What are the clinical ramifications of enamel dysplasia?
Proliferation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Trauma - pressure or metabolic disease
Epithelial rests of Malassez

49. When does dens in dente occur?
During the cap stage
Dentin and alveolar bone
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Pressure on the area

50. What happens during the cap stage?
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.
Initiation stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Morphogenesis