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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 happens when the reduced enamel epithelium is created?
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
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
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
In the cap stage

2. What processes are involved with the apposition stage?
Induction - proliferation
When the gingiva recedes and no actual tooth movement takes place
Outer
The ectoderm

3. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Enamel organ invaginates into the dental papilla
Dental papilla
There are none - they are lost with eruption

4. What are the formative cells for alveolar bone?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Faulty development of enamel from interference involving ameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Osteoblasts

5. The stellate reticulum is located inner or outer?
Outer
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Apposition of the cementum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

6. What wll the inner enamel epithelium differentiate into?
The ectomesenchyme
Dentin and alveolar bone
The basement membrane that seperates the enamel organ and dental papilla
Enamel secreting cells (ameloblasts)

7. What is the main process involved in the bud stage?
Compressed layer of flat to cuboidal cells
Induction - proliferation
Proliferation
Hereditary

8. Which teeth are nonsuccedaneous?
The permanent molars
Osteoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The outer cells of the dental papilla and the central cells of the dental papilla

9. What is the site for the future dentioenamel junction?
Preameloblasts
The basement membrane that seperates the enamel organ and 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
The bud stage

10. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Union of root structure of two or more teeth by cementum
Cementoblasts

11. What is macrodontia?
Abnormally large teeth
In the cap stage
Enamel pearl - enamel dysplasia - and concresence
Only dentinal tubules with processes

12. What is the structure responsible for root development?
Tooth germ tries to divide
Differentiation
Compressed layer of flat to cuboidal cells
The cervical loop

13. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Odontogenesis
Traumatic injury or crowding of teeth
Odontoblastic process

14. What are the incremental lines for dentin?
Imbrication lines of von Ebner
A mineralized cylinder - the dentinal tubule
Dens in dente - gemination - tubercle - and fusion
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

15. What are the clinical ramifications?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
4 types
Development of one or more extra teeth
Common on permanent molars or cingulum of anterior teeth

16. What is concrescence?
Union of root structure of two or more teeth by cementum
Future dentin and pulp tissue
Apposition of the cementum
Common with permanent maxillary molars

17. Tooth development
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontogenesis
Absence of single or multiple teeth
The enamel organ is compressed

18. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
The stellate reticulum
Proliferation - differentiation - morphogenesis
The cervical loop

19. What are the clinical ramifications of micro/macrodontia?
Dental follicle
The stellate reticulum
Commonly involves permanent maxillary lateral incisor and 3rd molars
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

20. What kind of cells reside in the stratum intermediate?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Compressed layer of flat to cuboidal cells
A mineralized cylinder - the dentinal tubule
Future dentin and pulp tissue

21. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The basement membrane that seperates the enamel organ and dental papilla
Preameloblasts
Faulty development of enamel from interference involving ameloblasts
4 types

22. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The enamel organ
Dental papilla
In the cap stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

23. What are the etiological factors for dens in dente and gemination?
Initiation stage
The dental sac
Hereditary
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

24. How many types of cells are found in the enamel organ in the bell stage?
Hereditary
4 types
There are none - they are lost with eruption
The enamel - dentin - and cementum are secreted in successive layers

25. What are the formative cells for cementum?
9th to 10th weeks
Cementoblasts
Enamel
Dental papilla

26. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
8th week
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cementocytes

27. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The cervical loop
The ameloblasts place an acellular dental cuticle on the new enamel surface
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

28. 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
Into odontoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectomesenchyme - which was influenced by the neural crest cells

29. What is the function of the Hertwig's epithelial root sheath?
Hereditary in localized form. endocrine dysfunction is complete
Apposition of the cementum
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ameloblasts

30. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
The ectomesenchyme
Absence of single or multiple teeth
A bilayer rim that consists only IEE and OEE

31. When does the tooth bud become a tooth germ?
Future dentin and pulp tissue
The basement membrane
In the cap stage
The ectomesenchyme - which was influenced by the neural crest cells

32. What are the etiological factors for micro/macrodontia?
Extra cusp due to effects on enamel organ
Development of one or more extra teeth
The cementum - PDL - and alveolar bone
Hereditary in localized form. endocrine dysfunction is complete

33. What are the formative cells for dentin?
Proliferation - differentiation - morphogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary in localized form. endocrine dysfunction is complete
Odontoblasts

34. What are the development disturbances of the apposition and maturation stages?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
8th week
Enamel pearl - enamel dysplasia - and concresence
Hereditary in localized form. endocrine dysfunction is complete

35. What is the time span for the cap stage?
Sphere of enamel on root
When the gingiva recedes and no actual tooth movement takes place
9th to 10th weeks
Local or systemic or hereditary

36. What layer serves as protection for the enamel organ?
Dental papilla
Alveolar bone
The ectomesenchyme - which was influenced by the neural crest cells
The outer enamel epithelium

37. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
When the gingiva recedes and no actual tooth movement takes place
11th to 12th weeks
Odontoclasts
Cementocytes

38. What are the odontoblastic processes is contained in what?
The actual vertical movement of the tooth
A mineralized cylinder - the dentinal tubule
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Absence of single or multiple teeth

39. What is the primordium of the tooth?
Odontoclasts
Abnormally small teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity
The tooth germ

40. What are the cell layers found in the enamel organ in the bell stage?
Abnormally small teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental papilla
Abnormally large teeth

41. What are the mature cells for alveolar bone?
Osteocytes
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Only dentinal tubules with processes
The outer enamel epithelium

42. What stage does supernumerary teeth occur?
Dental follicle
Dens in dente - gemination - tubercle - and fusion
Initiation
Epithelial rests of Malassez

43. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Oral epithelium
Epithelial rests of Malassez
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 outer cells of the dental papilla and the central cells of the dental papilla

44. What are the mature cells for enamel?
Dental papilla
Inner
Preameloblasts
There are none - they are lost with eruption

45. What is the cap in the cap stage?
Enamel organ invaginates into the dental papilla
The enamel organ
Oral epithelium
Osteoblasts

46. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Initiation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The basement membrane

47. What happens during the bell stage?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The tooth germ
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
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

48. What are the etiological factors of enamel dysplasia?
Apposition of the cementum
The ectomesenchyme
Oral epithelium
Local or systemic or hereditary

49. What are the clinical ramifications of concrescence?
Abnormally large teeth
Common with permanent maxillary molars
Arrest and reversal lines
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

50. What happens during the apposition stage?
Ameloblasts
Initiation stage
Displacement of ameloblasts to root surface
Dental tissues secreted as matrix in successive layers.

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Dentistry Tooth Development And Eruption

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