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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 is the time span for initiation?
Oral epithelium
6th to 7th weeks
The enamel organ is compressed
The dental lamina

2. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
The cervical loop
Epithelial
The tooth germ

3. What processes are involved in the bell stage?
Morphogenesis
Odontoblasts
Differentiation - proliferation - morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

4. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
The enamel organ - dental papilla - dental sac
Enamel pearl - enamel dysplasia - and concresence
Epithelial

5. What else undergoes proliferation in the bud stage besides the dental lamina?
Enamel pearl - enamel dysplasia - and concresence
The enamel organ is compressed
The ectomesenchyme
Cementoblasts

6. What is enamel dysplasia?
Bud stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The actual vertical movement of the tooth
Faulty development of enamel from interference involving ameloblasts

7. What are the formative cells for dentin?
Initiation
Enamel organ invaginates into the dental papilla
A bilayer rim that consists only IEE and OEE
Odontoblasts

8. What is matrix?
During the cap stage
Odontogenesis
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

9. What is microdontia?
Union of 2 adjacent tooth germs
Union of root structure of two or more teeth by cementum
Hereditary
Abnormally small teeth

10. What will the dental sac give rise to?
Dental papilla
4 types
Lines of Retzuis
The cementum - PDL - and alveolar bone

11. Active eruption
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 actual vertical movement of the tooth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
In the cap stage

12. How is the reduced enamel epithelium created?
Hereditary
The enamel organ is compressed
The basement membrane
Induction - proliferation

13. What stage does the dental tissues subsequently fully mineralize
Induction - proliferation
Initiation stage
Maturation
Dens in dente - gemination - tubercle - and fusion

14. What are succedaneous teeth?
Initiation stage
Into odontoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

15. What stage does anodontia occur?
Initiation stage
Local or systemic or hereditary
Displacement of ameloblasts to root surface
Union of 2 adjacent tooth germs

16. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Common with permanent maxillary molars
Into odontoblasts
The dental sac
Hereditary

17. What is gemination?
Tooth germ tries to divide
Osteoblasts
Enamel organ
There is unequal growth in different parts of the tooth bud

18. What do the odontoblasts do?
Faulty development of enamel from interference involving ameloblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental papilla
Alveolar bone

19. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
May be confused as calculus deposit on root
Dentin and alveolar bone
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

20. What are the etiological factors for fusion?
Cuboidal cells
Cementoid
Pressure on the area
Imbrication lines of von Ebner

21. What is the time span for the bud stage?
8th week
Inner
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
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.

22. What are the clinical ramifications of enamel pearl?
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
May be confused as calculus deposit on root
Imbrication lines of von Ebner

23. What is the embryological background for enamel?
Enamel organ
Pressure on the area
Hereditary in localized form. endocrine dysfunction is complete
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

24. What happens during the apposition stage?
Induction
Apposition of the cementum
Pressure on the area
Dental tissues secreted as matrix in successive layers.

25. What are the incremental lines for enamel?
Lines of Retzuis
Induction - proliferation
The tooth germ
Odontoblasts

26. What will the inner cells of the dental lamina differentiates into?
Abnormally small teeth
The primordium of the pulp
Displacement of ameloblasts to root surface
Absence of single or multiple teeth

27. What is anodontia?
The enamel organ is compressed
The ameloblasts place an acellular dental cuticle on the new enamel surface
Absence of single or multiple teeth
Displacement of ameloblasts to root surface

28. What are the cell layers found in the enamel organ in the bell stage?
The dental lamina
Inner
Tall columnar cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

29. The oral epithelium is induced by the ectomesenchyme to produce what?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The dental lamina
The stellate reticulum

30. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Only dentinal tubules with processes
The ameloblasts place an acellular dental cuticle on the new enamel surface
Morphogenesis
Trauma - pressure or metabolic disease

31. What is dens in dente?
Enamel organ invaginates into the dental papilla
Initiation
The ameloblasts
The ectoderm

32. What are the processes involved in the cap stage?
Enamel secreting cells (ameloblasts)
Dental follicle
Abnormally large teeth
Proliferation - differentiation - morphogenesis

33. What is an enamel pearl?
Sphere of enamel on root
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental follicle
It disintegrates as the developing oral mucosa comes to line the oral cavity

34. What happens during the bud stage?
Hereditary
The ectomesenchyme
Extra cusp due to effects on enamel organ
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

35. What hard tissue has vascularity?
Alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity
Sphere of enamel on root
Abnormally small teeth

36. What is the main process involved in the bud stage?
Osteocytes
The dental lamina
Proliferation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

37. What is the process involved in the maturation 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
The stellate reticulum
Maturation
Commonly involves permanent maxillary lateral incisor and 3rd molars

38. What is amelogenisis?
The ectomesenchyme
Cementoblasts
The apposition of the enamel matrix
Differentiation

39. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Apposition of the cementum
The apposition of the enamel matrix
Hereditary

40. What is the cementum matrix called?
Epithelial
The basement membrane that seperates the enamel organ and dental papilla
Cementoid
Hereditary in localized form. endocrine dysfunction is complete

41. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Dens in dente - gemination - tubercle - and fusion
Cuboidal cells
Odontoblasts
The basement membrane

42. What is fusion?
Union of 2 adjacent tooth germs
Enamel
Development of one or more extra teeth
The ectomesenchyme

43. Passive eruption
Tooth germ
Union of root structure of two or more teeth by cementum
Arrest and reversal lines
When the gingiva recedes and no actual tooth movement takes place

44. Where does the primordium of the permanent dentition develop?
Initiation stage
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Inner
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

45. When does the tooth bud become a tooth germ?
Union of root structure of two or more teeth by cementum
The ameloblasts place an acellular dental cuticle on the new enamel surface
In the cap stage
Enamel organ

46. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
9th to 10th weeks
There is unequal growth in different parts of the tooth bud
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Tooth germ

47. What is the main process involved in initiation?
Osteoblasts
Epithelial rests of Malassez
Induction
Local or systemic or hereditary

48. What are the mature cells for alveolar bone?
The outer enamel epithelium
Inner
The basement membrane
Osteocytes

49. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
6th to 7th weeks
Common with permanent maxillary molars
Epithelial rests of Malassez
The cervical loop

50. Where is the dental sac originally derived from?
There are none - they are lost with eruption
The ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel organ is compressed

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Dentistry Tooth Development And Eruption

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