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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. Where is the enamal organ originally derived from?
The basement membrane
The ectoderm
Differentiation - proliferation - morphogenesis
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

2. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Odontoclasts
Initiation
The basement membrane
Abnormally large teeth

3. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Induction
Compressed layer of flat to cuboidal cells
Imbrication lines of von Ebner
Tooth germ

4. What is an enamel pearl?
Sphere of enamel on root
Inner
The dental lamina
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

5. What is the cementum matrix called?
Local or systemic or hereditary
Cementoid
Epithelial rests of Malassez
Extra cusp due to effects on enamel organ

6. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Enamel secreting cells (ameloblasts)
The actual vertical movement of the tooth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

7. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme
Development of one or more extra teeth

8. What is the outer portion of the ectoderm in the initiation stage?
The cementum - PDL - and alveolar bone
Oral epithelium
The apposition of the enamel matrix
The outer cells of the dental papilla and the central cells of the dental papilla

9. What are supernumerary teeth?
May be confused as calculus deposit on root
Development of one or more extra teeth
The ectomesenchyme
The dental sac

10. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental tissues fully mineralize to their mature levels.
Initiation
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

11. What are the clinical ramifications of anodontia?
9th to 10th weeks
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Traumatic injury or crowding of teeth
The apposition of the enamel matrix

12. What are the developmental disturbances of the cap stage?
Dental follicle
Dens in dente - gemination - tubercle - and fusion
Union of root structure of two or more teeth by cementum
The apposition of the enamel matrix

13. What are the etiological factors for dens in dente and gemination?
The actual vertical movement of the tooth
The tooth germ
Hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

14. What type of tissue is dentin - cementum - and alveolar bone?
The ectomesenchyme
Development of one or more extra teeth
Connective
Abnormally small teeth

15. What is the time span for the cap stage?
9th to 10th weeks
The basement membrane
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Arrest and reversal lines

16. What is concrescence?
Union of root structure of two or more teeth by cementum
May be confused as calculus deposit on root
Hereditary in localized form. endocrine dysfunction is complete
Commonly involves permanent maxillary lateral incisor and 3rd molars

17. What is cementogenisis?
Odontoblasts
Odontoblastic process
Dentin and alveolar bone
Apposition of the cementum

18. What happens during the apposition stage?
Differentiation
When the gingiva recedes and no actual tooth movement takes place
Proliferation - differentiation - morphogenesis
Dental tissues secreted as matrix in successive layers.

19. What are the clinical ramifications of concrescence?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Common with permanent maxillary molars
When the gingiva recedes and no actual tooth movement takes place
Initiation stage

20. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Commonly involves permanent maxillary lateral incisor and 3rd molars
Odontogenesis
Enamel secreting cells (ameloblasts)

21. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Union of root structure of two or more teeth by cementum
Dentin secreting cells (odontoblats)
The basement membrane
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

22. Active eruption
Dental papilla
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental lamina
The actual vertical movement of the tooth

23. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Abnormally large teeth
9th to 10th weeks
Outer

24. What are the etiological factors for fusion?
Pressure on the area
9th to 10th weeks
Epithelial
Arrest and reversal lines

25. What are entrapped cementoblasts called?
Epithelial rests of Malassez
The ameloblasts
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
Cementocytes

26. What are the development disturbances of the apposition and maturation stages?
The dental lamina
Enamel pearl - enamel dysplasia - and concresence
Pressure on the area
The enamel organ - dental papilla - dental sac

27. When does the tooth bud become a tooth germ?
Epithelial rests of Malassez
In the cap stage
Cuboidal cells
Alveolar bone

28. What hard tissue has vascularity?
Maturation
Alveolar bone
Apposition of the cementum
The enamel organ

29. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Cementoid
The outer cells of the dental papilla and the central cells of the dental papilla
The ameloblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

30. What are the cell layers found in the enamel organ in the bell stage?
The dental lamina
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Pressure on the area
Dental papilla

31. What is the embryological background for enamel?
Enamel organ
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
Displacement of ameloblasts to root surface

32. What is the main process involved in initiation?
Abnormally small teeth
The dental lamina
Induction
The outer enamel epithelium

33. What is gemination?
Odontoblastic process
Tooth germ tries to divide
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
Oral epithelium

34. What kind of cells occur in the outer enamel epithelium in the bell stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental tissues secreted as matrix in successive layers.
Cuboidal cells
Epithelial

35. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Traumatic injury or crowding of teeth
8th week
Enamel pearl - enamel dysplasia - and concresence

36. How many types of cells are found in the enamel organ in the bell stage?
4 types
The dental lamina
Morphogenesis
Cementocytes

37. What stage does supernumerary teeth occur?
There is unequal growth in different parts of the tooth bud
The actual vertical movement of the tooth
Osteoblasts
Initiation

38. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Tooth germ tries to divide
Enamel secreting cells (ameloblasts)
The ameloblasts place an acellular dental cuticle on the new enamel surface
During the cap stage

39. What do the odontoblasts do?
Dental papilla
Odontoclasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dentin and alveolar bone

40. What kind of cells reside in the stratum intermediate?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Compressed layer of flat to cuboidal cells
Odontoblastic process
Common with permanent maxillary molars

41. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Epithelial rests of Malassez
Pressure on the area

42. What stage does the dental tissues subsequently fully mineralize
The dental lamina
Maturation
Tooth germ
Odontogenesis

43. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental tissues fully mineralize to their mature levels.
The basement membrane that seperates the enamel organ and dental papilla
Epithelial rests of Malassez

44. What are the formative cells for alveolar bone?
Hereditary in localized form. endocrine dysfunction is complete
Oral epithelium
Dental papilla
Osteoblasts

45. What hard tissue is innervated by nerves?
Dentin and alveolar bone
The cervical loop
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontoblastic process

46. What happens during the bud stage?
Induction - proliferation
The outer enamel epithelium
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
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

47. Where does the primordium of the permanent dentition develop?
Common with permanent maxillary molars
Enamel organ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectomesenchyme - which was influenced by the neural crest cells

48. What are the formative cells for cementum?
Only dentinal tubules with processes
A mineralized cylinder - the dentinal tubule
Cementoblasts
During the cap stage

49. What is the predominate process of the cap stage?
6th to 7th weeks
Morphogenesis
The bud stage
The apposition of the enamel matrix

50. Where is the dental papilla originally derived from?
Apposition of the cementum
The ectomesenchyme - which was influenced by the neural crest cells
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The primordium of the pulp

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