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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 development disturbances of the apposition and maturation stages?
The ectomesenchyme
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
Enamel pearl - enamel dysplasia - and concresence
The cervical loop

2. What are the incremental lines for enamel?
Maturation
Imbrication lines of von Ebner
Bud stage
Lines of Retzuis

3. What is microdontia?
Abnormally small teeth
The enamel - dentin - and cementum are secreted in successive layers
Enamel organ
Differentiation

4. What are the mature cells for cementum?
Pressure on the area
The permanent molars
Cementocytes
The ectomesenchyme

5. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Proliferation
Outer
Maturation
Tooth germ

6. What are the etiological factors for anodontia?
Alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Tooth germ
Morphogenesis

7. What are the formative cells for enamel?
Proliferation - differentiation - morphogenesis
Ameloblasts
The basement membrane
Enamel secreting cells (ameloblasts)

8. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Initiation stage
The ectomesenchyme
Induction

9. Do odontoblasts start their secretion of matrix before the ameloblasts?
11th to 12th weeks
Faulty development of enamel from interference involving ameloblasts
Lines of Retzuis
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

10. What layer serves as protection for the enamel organ?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
9th to 10th weeks
Apposition of the cementum
The outer enamel epithelium

11. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Preameloblasts
Development of one or more extra teeth
Cementoblasts

12. Where is the enamal organ originally derived from?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ectoderm
Displacement of ameloblasts to root surface
The actual vertical movement of the tooth

13. What are the clinical ramifications of supernumerary teeth?
Odontoblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dental papilla
Proliferation - differentiation - morphogenesis

14. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
The cervical loop
The enamel organ - dental papilla - dental sac
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

15. What are succedaneous teeth?
Dentin secreting cells (odontoblats)
Bud stage
Traumatic injury or crowding of teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

16. Where is the dental papilla originally derived from?
Cuboidal cells
Odontoblastic process
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

17. What is another name for the dental sac?
Dental follicle
Local or systemic or hereditary
The ectomesenchyme
Common with permanent maxillary molars

18. What is the cementum matrix called?
Apposition of the cementum
Into odontoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoid

19. What happens during the apposition stage?
Union of 2 adjacent tooth germs
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dental papilla
Dental tissues secreted as matrix in successive layers.

20. What stage does the dental tissues subsequently fully mineralize
Hereditary in localized form. endocrine dysfunction is complete
Maturation
Dental papilla
Tooth germ

21. What is the process involved in the maturation stage?
The basement membrane that seperates the enamel organ and dental papilla
Maturation
11th to 12th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

22. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
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 ameloblasts place an acellular dental cuticle on the new enamel surface
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
Epithelial rests of Malassez

23. What processes are involved in the bell stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Union of root structure of two or more teeth by cementum
Initiation
Differentiation - proliferation - morphogenesis

24. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
There is unequal growth in different parts of the tooth bud
Induction - proliferation
During the cap stage

25. What is fusion?
Arrest and reversal lines
There are none - they are lost with eruption
Tooth germ tries to divide
Union of 2 adjacent tooth germs

26. What is the predominate process of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Morphogenesis
The enamel - dentin - and cementum are secreted in successive layers
The ectomesenchyme - which was influenced by the neural crest cells

27. What are the mature cells for enamel?
Abnormally small teeth
There are none - they are lost with eruption
Cementocytes
The ectomesenchyme - which was influenced by the neural crest cells

28. The oral epithelium is induced by the ectomesenchyme to produce what?
Dental tissues secreted as matrix in successive layers.
The dental lamina
Inner
The enamel organ is compressed

29. What is the main process involved in initiation?
Proliferation - differentiation - morphogenesis
Faulty development of enamel from interference involving ameloblasts
Cementocytes
Induction

30. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane
Maturation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

31. What will the dental sac give rise to?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dentin secreting cells (odontoblats)
The cementum - PDL - and alveolar bone
As a result of the apposition of cementum over dentin

32. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Faulty development of enamel from interference involving ameloblasts
Extra cusp due to effects on enamel organ
Osteoblasts

33. What are supernumerary teeth?
The primordium of the pulp
The stellate reticulum
Dental tissues secreted as matrix in successive layers.
Development of one or more extra teeth

34. What is the time span for the bell stage?
Induction - proliferation
Pressure on the area
Enamel pearl - enamel dysplasia - and concresence
11th to 12th weeks

35. What is the time span for initiation?
6th to 7th weeks
Abnormally small teeth
Dens in dente - gemination - tubercle - and fusion
The outer enamel epithelium

36. What is the structure responsible for root development?
Induction - proliferation
Traumatic injury or crowding of teeth
The bud stage
The cervical loop

37. What is the primordium of the tooth?
Enamel secreting cells (ameloblasts)
Odontoblastic process
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The tooth germ

38. What are the clinical ramifications of anodontia?
Alveolar bone
Epithelial rests of Malassez
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Common on permanent molars or cingulum of anterior teeth

39. What are entrapped cementoblasts called?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cementocytes
The basement membrane
Into odontoblasts

40. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
During the cap stage
Cementocytes

41. What happens during initiation?
Connective
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
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Proliferation - differentiation - morphogenesis

42. What are the formative cells for dentin?
Proliferation
Odontoblasts
Extra cusp due to effects on enamel organ
Dental follicle

43. Tooth development
Epithelial rests of Malassez
Abnormally small teeth
Enamel organ invaginates into the dental papilla
Odontogenesis

44. What are the clinical ramifications of dens in dente?
Morphogenesis
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Ameloblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity

45. What wll the inner enamel epithelium differentiate into?
Cuboidal cells
Enamel secreting cells (ameloblasts)
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.
Extra cusp due to effects on enamel organ

46. What will the dental papilla eventually form?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Future dentin and pulp tissue
The basement membrane
Epithelial rests of Malassez

47. What do the odontoblasts do?
The primordium of the pulp
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The basement membrane that seperates the enamel organ and dental papilla
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

48. What are the odontoblastic processes is contained in what?
Imbrication lines of von Ebner
Oral epithelium
A mineralized cylinder - the dentinal tubule
The ectomesenchyme

49. What is amelogenisis?
Cementocytes
Into odontoblasts
The apposition of the enamel matrix
9th to 10th weeks

50. Passive eruption
Bud stage
The actual vertical movement of the tooth
When the gingiva recedes and no actual tooth movement takes place
Displacement of ameloblasts to root surface

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Dentistry Tooth Development And Eruption

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