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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. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The tooth germ
Odontoblastic process
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

2. What are the clinical ramifications of gemination?

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3. What will the dental papilla eventually form?
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
Future dentin and pulp tissue
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Hereditary in localized form. endocrine dysfunction is complete

4. What are the etiological factors of enamel dysplasia?
Bud stage
During the cap stage
Union of 2 adjacent tooth germs
Local or systemic or hereditary

5. What are the clinical ramifications of supernumerary teeth?
Alveolar bone
Dentin and alveolar bone
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Epithelial

6. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The outer cells of the dental papilla and the central cells of the dental papilla
Sphere of enamel on root
Dental tissues secreted as matrix in successive layers.

7. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The dental sac
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

8. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
4 types
A bilayer rim that consists only IEE and OEE
Outer

9. What kind of cells reside in the stratum intermediate?
Only dentinal tubules with processes
Differentiation - proliferation - morphogenesis
The dental lamina
Compressed layer of flat to cuboidal cells

10. What is the time span for the cap stage?
The cementum - PDL - and alveolar bone
9th to 10th weeks
8th week
The tooth germ

11. 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
Bud stage
Hereditary
Local or systemic or hereditary

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

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13. What is the cap in the cap stage?
Imbrication lines of von Ebner
The enamel organ
Enamel organ
Tooth germ tries to divide

14. The preameloblasts induce dental papilla cells to differentiate into what?
When the gingiva recedes and no actual tooth movement takes place
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
The ectomesenchyme

15. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
It disintegrates as the developing oral mucosa comes to line the oral cavity
Trauma - pressure or metabolic disease
Tooth germ

16. What is the main process involved in the bud stage?
Dentin secreting cells (odontoblats)
Cementoblasts
Proliferation
Union of root structure of two or more teeth by cementum

17. What are the etiological factors for anodontia?
The ectomesenchyme
Cementocytes
Maturation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

18. What type of tissue is enamel?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Proliferation
Development of one or more extra teeth
Epithelial

19. What are the clinical ramifications?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Common on permanent molars or cingulum of anterior teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars
Absence of single or multiple teeth

20. What hard tissue is innervated by nerves?
Tall columnar cells
During the cap stage
The enamel organ is compressed
Dentin and alveolar bone

21. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Oral epithelium
Maturation
Dentin secreting cells (odontoblats)

22. The stellate reticulum is located inner or outer?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ectomesenchyme
Dental papilla
Outer

23. What hard tissue has vascularity?
Initiation stage
Cuboidal cells
Oral epithelium
Alveolar bone

24. Tooth development
Odontogenesis
Tall columnar cells
Morphogenesis
Apposition of the cementum

25. What is enamel dysplasia?
Dentin and alveolar bone
Faulty development of enamel from interference involving ameloblasts
Local or systemic or hereditary
Cuboidal cells

26. What stage does the dental tissues subsequently fully mineralize
Maturation
Local or systemic or hereditary
Differentiation
Faulty development of enamel from interference involving ameloblasts

27. When does the process of root development take place?
Maturation
Traumatic injury or crowding of teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
A mineralized cylinder - the dentinal tubule

28. What is concrescence?
Common on permanent molars or cingulum of anterior teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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 root structure of two or more teeth by cementum

29. What is the predominate process in the bell stage?
Odontogenesis
Odontoblasts
Differentiation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

30. What does the cervical loop consist of?
Dentin secreting cells (odontoblats)
8th week
A bilayer rim that consists only IEE and OEE
Absence of single or multiple teeth

31. What are the etiological factors for fusion?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The apposition of the enamel matrix
Pressure on the area
Epithelial

32. What stage does anodontia occur?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Preameloblasts
Oral epithelium
Initiation stage

33. What are the clinical ramifications of fusion?
Pressure on the area
The outer enamel epithelium
Dental tissues fully mineralize to their mature levels.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

34. When does the tooth bud become a tooth germ?
When the gingiva recedes and no actual tooth movement takes place
In the cap stage
Dentin secreting cells (odontoblats)
4 types

35. How many types of cells are found in the enamel organ in the bell stage?
Odontogenesis
4 types
The permanent molars
Cementoid

36. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Induction - proliferation
Common on permanent molars or cingulum of anterior teeth
Union of root structure of two or more teeth by cementum
The dental sac

37. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Traumatic injury or crowding of teeth
Enamel secreting cells (ameloblasts)
The enamel organ

38. What is gemination?
In the cap stage
Tooth germ tries to divide
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation - proliferation - morphogenesis

39. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
Tooth germ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dens in dente - gemination - tubercle - and fusion

40. What are the mature cells for alveolar bone?
Cementoid
Proliferation - differentiation - morphogenesis
Osteocytes
Dental follicle

41. What is tubercle?
Outer
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Extra cusp due to effects on enamel organ
The dental lamina

42. What happens during the appositional stage?
Tall columnar cells
Connective
The enamel - dentin - and cementum are secreted in successive layers
Only dentinal tubules with processes

43. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Differentiation - proliferation - morphogenesis
Dental tissues secreted as matrix in successive layers.
The tooth germ
Preameloblasts

44. What are the developmental disturbances of the cap stage?
The basement membrane
8th week
Dens in dente - gemination - tubercle - and fusion
Alveolar bone

45. What happens during the cap stage?
The stellate reticulum
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.
Displacement of ameloblasts to root surface

46. Passive eruption
Hereditary in localized form. endocrine dysfunction is complete
The permanent molars
When the gingiva recedes and no actual tooth movement takes place
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

47. What are the incremental lines for enamel?
Lines of Retzuis
Ameloblasts
As a result of the apposition of cementum over dentin
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

48. What are the development disturbances of the apposition and maturation stages?
Tooth germ
Enamel pearl - enamel dysplasia - and concresence
Dental papilla
Oral epithelium

49. What is an enamel pearl?
Sphere of enamel on root
Enamel pearl - enamel dysplasia - and concresence
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Proliferation - differentiation - morphogenesis

50. When does dens in dente occur?
Cementocytes
During the cap stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementocytes

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Dentistry Tooth Development And Eruption

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