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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 inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Odontogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

2. What is the primordium of the tooth?
Displacement of ameloblasts to root surface
The tooth germ
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
Odontoblastic process

3. What is the site for the future dentioenamel junction?
A bilayer rim that consists only IEE and OEE
The basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
The basement membrane that seperates the enamel organ and dental papilla

4. What is matrix?
The basement membrane that seperates the enamel organ and dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontoclasts
Alveolar bone

5. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The basement membrane
Hereditary
Tooth germ
The outer enamel epithelium

6. Which layer in the bell stage has star shaped cells?
Trauma - pressure or metabolic disease
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The stellate reticulum
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

7. How many types of cells are found in the enamel organ in the bell stage?
Pressure on the area
In the cap stage
4 types
The ectoderm

8. What hard tissue is can not have tissue formation after eruption?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Extra cusp due to effects on enamel organ
Enamel
Maturation

9. What hard tissue has vascularity?
Odontoblasts
Oral epithelium
Alveolar bone
Odontoblastic process

10. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Osteocytes
Imbrication lines of von Ebner
Trauma - pressure or metabolic disease

11. What processes are involved in the bell stage?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation - proliferation - morphogenesis
Enamel secreting cells (ameloblasts)
Initiation

12. What happens during the cap stage?
May be confused as calculus deposit on root
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.
Inner
11th to 12th weeks

13. Passive eruption
Absence of single or multiple teeth
Outer
When the gingiva recedes and no actual tooth movement takes place
Enamel organ invaginates into the dental papilla

14. What hard tissue is innervated by nerves?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentin and alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontoclasts

15. What are the incremental lines for cementum and alveolar bone?
Imbrication lines of von Ebner
Arrest and reversal lines
8th week
Union of root structure of two or more teeth by cementum

16. What is the predominate process of the cap stage?
Future dentin and pulp tissue
When the gingiva recedes and no actual tooth movement takes place
Morphogenesis
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

17. What are the mature cells for enamel?
The enamel organ - dental papilla - dental sac
Enamel organ invaginates into the dental papilla
There are none - they are lost with eruption
A mineralized cylinder - the dentinal tubule

18. What type of tissue is dentin - cementum - and alveolar bone?
Connective
The ectomesenchyme
Enamel organ
Hereditary

19. What are the major components of the tooth germ?
Differentiation - proliferation - morphogenesis
The enamel organ - dental papilla - dental sac
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
As a result of the apposition of cementum over dentin

20. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
6th to 7th weeks
Inner
Proliferation

21. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Arrest and reversal lines
Extra cusp due to effects on enamel organ
Enamel

22. What are the etiological factors for micro/macrodontia?
Connective
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.
Hereditary in localized form. endocrine dysfunction is complete
The tooth germ

23. 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
Imbrication lines of von Ebner
Traumatic injury or crowding of teeth
When the gingiva recedes and no actual tooth movement takes place

24. 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
The basement membrane that seperates the enamel organ and dental papilla
Development of one or more extra teeth

25. What are the clinical ramifications of enamel dysplasia?
Maturation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Compressed layer of flat to cuboidal cells

26. What happens during the apposition stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental tissues secreted as matrix in successive layers.
Initiation
Dental tissues fully mineralize to their mature levels.

27. What is concrescence?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Union of root structure of two or more teeth by cementum
As a result of the apposition of cementum over dentin
4 types

28. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Absence of single or multiple teeth
Lines of Retzuis
The permanent molars
The outer cells of the dental papilla and the central cells of the dental papilla

29. What is the function of the Hertwig's epithelial root sheath?
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 basement membrane
Enamel organ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

30. What is the cap in the cap stage?
Dental tissues fully mineralize to their mature levels.
Imbrication lines of von Ebner
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel organ

31. What will the outer cells of the dental lamina differentiate into?
Osteoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Extra cusp due to effects on enamel organ
Dentin secreting cells (odontoblats)

32. What are the formative cells for cementum?
Preameloblasts
Odontoblasts
Dentin and alveolar bone
Cementoblasts

33. What is the time span for the bell stage?
11th to 12th weeks
Cementocytes
Imbrication lines of von Ebner
The stellate reticulum

34. What are the developmental disturbances of the cap stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dens in dente - gemination - tubercle - and fusion
Dental papilla

35. 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
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.
Differentiation
Cementoblasts

36. How is the dentinocemental junction formed?
The basement membrane
As a result of the apposition of cementum over dentin
Dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

37. The stellate reticulum is located inner or outer?
Outer
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
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

38. What kind of cells reside in the stratum intermediate?
6th to 7th weeks
Compressed layer of flat to cuboidal cells
Differentiation - proliferation - morphogenesis
11th to 12th weeks

39. What is the embryological background for enamel?
The basement membrane
Enamel organ
Imbrication lines of von Ebner
The ectomesenchyme

40. What wll the inner enamel epithelium differentiate into?
Dental papilla
Maturation
Enamel secreting cells (ameloblasts)
Hereditary

41. What are the mature cells for cementum?
The ameloblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Preameloblasts
Cementocytes

42. Tooth development
The enamel organ is compressed
Displacement of ameloblasts to root surface
Induction - proliferation
Odontogenesis

43. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Abnormally small teeth
Osteocytes
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

44. What are the odontoblastic processes is contained in what?
Dental tissues fully mineralize to their mature levels.
Epithelial rests of Malassez
A mineralized cylinder - the dentinal tubule
During the cap stage

45. What are the clinical ramifications of anodontia?
Initiation
Sphere of enamel on root
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Tooth germ tries to divide

46. What are the mature cells for dentin?
The basement membrane
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Hereditary
Only dentinal tubules with processes

47. What are entrapped cementoblasts called?
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
Cementocytes
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel organ

48. What are the etiological factors for fusion?
Pressure on the area
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
There are none - they are lost with eruption

49. What happens during the appositional stage?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Future dentin and pulp tissue
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The enamel - dentin - and cementum are secreted in successive layers

50. What are the clinical ramifications of enamel pearl?
Apposition of the cementum
May be confused as calculus deposit on root
The actual vertical movement of the tooth
Cementocytes

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Dentistry Tooth Development And Eruption

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