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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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1. What is the time span for the bud stage?
8th week
Dentin and alveolar bone
Dental papilla
Union of root structure of two or more teeth by cementum

2. What is the time span for the bell stage?
11th to 12th weeks
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Sphere of enamel on root
Traumatic injury or crowding of teeth

3. What processes are involved in the bell stage?
Absence of single or multiple teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The basement membrane
Differentiation - proliferation - morphogenesis

4. What happens during the cap stage?
Enamel
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
It disintegrates as the developing oral mucosa comes to line the oral cavity

5. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Local or systemic or hereditary
Maturation
Epithelial rests of Malassez

6. What is the time span for the cap stage?
6th to 7th weeks
The dental sac
The permanent molars
9th to 10th weeks

7. What happens during the bell stage?
Hereditary
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
As a result of the apposition of cementum over dentin
Preameloblasts

8. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Development of one or more extra teeth
Future dentin and pulp tissue
The outer cells of the dental papilla and the central cells of the dental papilla
As a result of the apposition of cementum over dentin

9. What is tubercle?
Extra cusp due to effects on enamel organ
Faulty development of enamel from interference involving ameloblasts
Induction - proliferation
When the gingiva recedes and no actual tooth movement takes place

10. What happens during the bud stage?
May be confused as calculus deposit on root
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

11. What is the embryological background for enamel?
Sphere of enamel on root
The tooth germ
Tooth germ
Enamel organ

12. What is amelogenisis?
The apposition of the enamel matrix
Cementocytes
Union of root structure of two or more teeth by cementum
Hereditary in localized form. endocrine dysfunction is complete

13. 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
Morphogenesis
4 types
There are none - they are lost with eruption

14. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Proliferation - differentiation - morphogenesis
11th to 12th weeks
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

15. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Sphere of enamel on root
There are none - they are lost with eruption
Common on permanent molars or cingulum of anterior teeth

16. What hard tissue is can not have tissue formation after eruption?
Enamel
Into odontoblasts
The basement membrane
Odontoblasts

17. What type of tissue is dentin - cementum - and alveolar bone?
Enamel
Connective
The ectomesenchyme
Induction - proliferation

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

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19. Do odontoblasts start their secretion of matrix before the ameloblasts?
Pressure on the area
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

20. What are the formative cells for cementum?
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
Cementoblasts
The ectoderm

21. What happens to the thickened non tooth producing portions of the dental lamina eventually?
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.
Apposition of the cementum
Differentiation
It disintegrates as the developing oral mucosa comes to line the oral cavity

22. What processes are involved with the apposition stage?
Hereditary in localized form. endocrine dysfunction is complete
Induction - proliferation
Maturation
Imbrication lines of von Ebner

23. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
The enamel - dentin - and cementum are secreted in successive layers
The dental lamina
The enamel organ

24. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
8th week
Extra cusp due to effects on enamel organ
Epithelial rests of Malassez
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

25. What do the odontoblasts do?
Ameloblasts
4 types
Cementocytes
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

26. What are supernumerary teeth?
Oral epithelium
Dentin secreting cells (odontoblats)
Apposition of the cementum
Development of one or more extra teeth

27. What are the etiological factors for enamel pearl?
Induction
Odontogenesis
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
Displacement of ameloblasts to root surface

28. In the cap stage the tooth bud does not grow - what happens?
Apposition of the cementum
The permanent molars
There is unequal growth in different parts of the tooth bud
The dental sac

29. What are the incremental lines for enamel?
The cementum - PDL - and alveolar bone
Lines of Retzuis
The dental lamina
The enamel - dentin - and cementum are secreted in successive layers

30. What is the cap in the cap stage?
Preameloblasts
Enamel organ
The enamel organ
Pressure on the area

31. What are the etiological factors for anodontia?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontoblastic process
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

32. What will the dental sac give rise to?
Odontoclasts
The tooth germ
Dental tissues fully mineralize to their mature levels.
The cementum - PDL - and alveolar bone

33. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Imbrication lines of von Ebner
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

34. Which layer in the bell stage has star shaped cells?
The dental lamina
Displacement of ameloblasts to root surface
The stellate reticulum
There is unequal growth in different parts of the tooth bud

35. What are the clinical ramifications of gemination?

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36. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Induction - proliferation
4 types
Dental papilla

37. What is the time span for initiation?
8th week
The dental lamina
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
6th to 7th weeks

38. What are the etiological factors for dens in dente and gemination?
Outer
Odontoblasts
The cementum - PDL - and alveolar bone
Hereditary

39. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Common on permanent molars or cingulum of anterior teeth
The apposition of the enamel matrix
Odontoblastic process

40. How is the reduced enamel epithelium 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
8th week
The enamel organ is compressed
During the cap stage

41. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Enamel secreting cells (ameloblasts)
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel
The basement membrane

42. What is macrodontia?
Abnormally large teeth
Osteoblasts
Compressed layer of flat to cuboidal cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

43. What is cementogenisis?
Apposition of the cementum
8th week
It disintegrates as the developing oral mucosa comes to line the oral cavity
Enamel

44. What is the primordium of the tooth?
The tooth germ
Arrest and reversal lines
Lines of Retzuis
Inner

45. What is the process involved in the maturation stage?
Maturation
Enamel
Cementoblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity

46. What is the main process involved in initiation?
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
Induction
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
It disintegrates as the developing oral mucosa comes to line the oral cavity

47. What is enamel dysplasia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental tissues fully mineralize to their mature levels.
Faulty development of enamel from interference involving ameloblasts
Ameloblasts

48. What are the clinical ramifications of micro/macrodontia?
The outer enamel epithelium
As a result of the apposition of cementum over dentin
Extra cusp due to effects on enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars

49. What are the incremental lines for dentin?
Hereditary in localized form. endocrine dysfunction is complete
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Only dentinal tubules with processes
Imbrication lines of von Ebner

50. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

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Dentistry Tooth Development And Eruption

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