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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. What are the mature cells for cementum?
Osteoblasts
11th to 12th weeks
Cementocytes
The enamel organ

2. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
Maturation
Connective
Cementoblasts

3. What happens when the reduced enamel epithelium is created?
Morphogenesis
Sphere of enamel on root
The apposition of the enamel matrix
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

4. When does dens in dente occur?
The bud stage
During the cap stage
The ectomesenchyme
The basement membrane

5. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Hereditary in localized form. endocrine dysfunction is complete
Cementoblasts
Traumatic injury or crowding of teeth

6. What happens during the cap stage?
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
Dentin and alveolar bone
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 primordium of the pulp

7. What are entrapped cementoblasts called?
Cementocytes
The actual vertical movement of the tooth
Cementoblasts
Trauma - pressure or metabolic disease

8. What processes are involved in the bell stage?
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
Extra cusp due to effects on 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

9. Where does the primordium of the permanent dentition develop?
Arrest and reversal lines
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
Union of 2 adjacent tooth germs
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

10. What is the time span for the bud stage?
8th week
The tooth germ
Union of 2 adjacent tooth germs
Common on permanent molars or cingulum of anterior teeth

11. What happens during the bud stage?
May be confused as calculus deposit on root
Differentiation - proliferation - morphogenesis
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel organ is compressed

12. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Morphogenesis
8th week
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.

13. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Common with permanent maxillary molars
Abnormally small teeth
Dental papilla
Dens in dente - gemination - tubercle - and fusion

14. What are the mature cells for dentin?
Initiation
Commonly involves permanent maxillary lateral incisor and 3rd molars
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.
Only dentinal tubules with processes

15. The preameloblasts induce dental papilla cells to differentiate into what?
Abnormally small teeth
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementoblasts
Into odontoblasts

16. Where is the dental sac originally derived from?
There are none - they are lost with eruption
Cementoid
The ectomesenchyme
As a result of the apposition of cementum over dentin

17. Where is the dental papilla originally derived from?
Common on permanent molars or cingulum of anterior teeth
Union of 2 adjacent tooth germs
The ectomesenchyme - which was influenced by the neural crest cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

18. What is the predominate process of the cap stage?
Differentiation
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.
Tooth germ tries to divide
Morphogenesis

19. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The cervical loop
The ameloblasts place an acellular dental cuticle on the new enamel surface
Tooth germ
Connective

20. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
During the cap stage
Common with permanent maxillary molars
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

21. What are the mature cells for enamel?
Induction - proliferation
The ectomesenchyme
The actual vertical movement of the tooth
There are none - they are lost with eruption

22. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
A mineralized cylinder - the dentinal tubule
The enamel - dentin - and cementum are secreted in successive layers

23. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Displacement of ameloblasts to root surface
When the gingiva recedes and no actual tooth movement takes place
It disintegrates as the developing oral mucosa comes to line the oral cavity
There are none - they are lost with eruption

24. What are the etiological factors for anodontia?
Dentin secreting cells (odontoblats)
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Proliferation
Common with permanent maxillary molars

25. What are the incremental lines for enamel?
Lines of Retzuis
As a result of the apposition of cementum over dentin
A bilayer rim that consists only IEE and OEE
The enamel organ is compressed

26. What stage does supernumerary teeth occur?
Arrest and reversal lines
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Initiation
A mineralized cylinder - the dentinal tubule

27. What else undergoes proliferation in the bud stage besides the dental lamina?
Induction - proliferation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ectomesenchyme
Oral epithelium

28. What are the clinical ramifications of enamel dysplasia?
Epithelial
The apposition of the enamel matrix
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

29. What stage does anodontia occur?
Absence of single or multiple teeth
Initiation stage
Dental tissues secreted as matrix in successive layers.
Commonly involves permanent maxillary lateral incisor and 3rd molars

30. Where is the enamel matrix secreted from by the ameloblasts?

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31. What is enamel dysplasia?
The ectoderm
Faulty development of enamel from interference involving ameloblasts
The enamel organ - dental papilla - dental sac
Common on permanent molars or cingulum of anterior teeth

32. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Odontogenesis

33. What are the incremental lines for cementum and alveolar bone?
Alveolar bone
Arrest and reversal lines
The dental lamina
Epithelial rests of Malassez

34. What is the structure responsible for root development?
There are none - they are lost with eruption
The cervical loop
Hereditary
Tooth germ

35. What are the etiological factors for fusion?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane
Pressure on the area
Future dentin and pulp tissue

36. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Dental tissues secreted as matrix in successive layers.
The basement membrane
Cementocytes
The cervical loop

37. When does macro/microdontia occur?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The basement membrane
Bud stage
Dental tissues secreted as matrix in successive layers.

38. What are the formative cells for alveolar bone?
Imbrication lines of von Ebner
Tooth germ
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Osteoblasts

39. What are the cell layers found in the enamel organ in the bell stage?
The enamel organ - dental papilla - dental sac
Cuboidal cells
The basement membrane
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

40. What is the primordium of the tooth?
Odontoblasts
The tooth germ
Only dentinal tubules with processes
Apposition of the cementum

41. How is the reduced enamel epithelium created?
The enamel organ is compressed
The basement membrane
The actual vertical movement of the tooth
Development of one or more extra teeth

42. When does the process of root development take place?
The enamel organ - dental papilla - dental sac
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Trauma - pressure or metabolic disease

43. What happens during initiation?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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
Morphogenesis
Trauma - pressure or metabolic disease

44. What does the cervical loop consist of?
The basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla
4 types
A bilayer rim that consists only IEE and OEE

45. In the cap stage the tooth bud does not grow - what happens?
Cuboidal cells
There is unequal growth in different parts of the tooth bud
The enamel organ - dental papilla - dental sac
Union of root structure of two or more teeth by cementum

46. What is another name for the dental sac?
Dental follicle
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Imbrication lines of von Ebner
Enamel organ

47. What is anodontia?
There are none - they are lost with eruption
Odontogenesis
Absence of single or multiple teeth
Faulty development of enamel from interference involving ameloblasts

48. What is gemination?
Tooth germ tries to divide
Into odontoblasts
The enamel organ - dental papilla - dental sac
Enamel organ invaginates into the dental papilla

49. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Dental tissues secreted as matrix in successive layers.
Odontoblasts
Dental follicle

50. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Preameloblasts
The outer cells of the dental papilla and the central cells of the dental papilla
The enamel organ

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Dentistry Tooth Development And Eruption

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