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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 kind of cells reside in the stratum intermediate?
May be confused as calculus deposit on root
The outer cells of the dental papilla and the central cells of the dental papilla
Compressed layer of flat to cuboidal cells
Preameloblasts

2. What is concrescence?
The outer enamel epithelium
There are none - they are lost with eruption
Maturation
Union of root structure of two or more teeth by cementum

3. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Morphogenesis
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
Bud stage

4. What type of tissue is enamel?
Dental follicle
Epithelial
Induction - proliferation
Compressed layer of flat to cuboidal cells

5. What will the dental sac give rise to?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontoblastic process
The cementum - PDL - and alveolar bone
Dentin secreting cells (odontoblats)

6. What are the formative cells for dentin?
Induction - proliferation
Oral epithelium
Odontoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

7. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Odontoclasts
Enamel
Cementoblasts
Dental papilla

8. What is fusion?
The ectomesenchyme
Union of 2 adjacent tooth germs
May be confused as calculus deposit on root
Dentin and alveolar bone

9. What is enamel dysplasia?
Extra cusp due to effects on enamel organ
Faulty development of enamel from interference involving ameloblasts
Cementoblasts
The cervical loop

10. What processes are involved with the apposition stage?
Odontoblasts
The basement membrane
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
Induction - proliferation

11. What are the etiological factors of tubercle?
Only dentinal tubules with processes
Trauma - pressure or metabolic disease
Enamel organ invaginates into the dental papilla
The stellate reticulum

12. What is amelogenisis?
Initiation
The apposition of the enamel matrix
Sphere of enamel on root
During the cap stage

13. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Dental papilla
Development of one or more extra teeth
Preameloblasts
Odontoblasts

14. What is the outer portion of the ectoderm in the initiation stage?
Bud stage
Oral epithelium
Cementocytes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

15. What is the function of the Hertwig's epithelial root sheath?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectoderm
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

16. What is the main process involved in the bud stage?
Epithelial
Proliferation
Future dentin and pulp tissue
Preameloblasts

17. What kind of cells occur in the inner enamel epithelium?
Dental papilla
The basement membrane
Enamel
Tall columnar cells

18. What is dens in dente?
Hereditary
Hereditary
Enamel organ invaginates into the dental papilla
The cementum - PDL - and alveolar bone

19. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The ectomesenchyme - which was influenced by the neural crest cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The apposition of the enamel matrix
The bud stage

20. What is microdontia?
The dental sac
Abnormally small 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
Induction

21. What are the etiological factors of enamel dysplasia?
The ameloblasts
When the gingiva recedes and no actual tooth movement takes place
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Local or systemic or hereditary

22. Active eruption
Common with permanent maxillary molars
Traumatic injury or crowding of teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The actual vertical movement of the tooth

23. What is the predominate process of the cap stage?
Morphogenesis
Cuboidal cells
The dental sac
Proliferation - differentiation - morphogenesis

24. What are the etiological factors for micro/macrodontia?
The stellate reticulum
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary in localized form. endocrine dysfunction is complete
Alveolar bone

25. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Initiation stage
There is unequal growth in different parts of the tooth bud
Cementoblasts

26. What is the embryological background for dentin - cementum and alveolar bone?
Arrest and reversal lines
Proliferation - differentiation - morphogenesis
Enamel secreting cells (ameloblasts)
Dental papilla

27. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Displacement of ameloblasts to root surface
The ectomesenchyme - which was influenced by the neural crest cells

28. Where does the primordium of the permanent dentition develop?
Dental follicle
Enamel organ invaginates into the dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Maturation

29. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
It disintegrates as the developing oral mucosa comes to line the oral cavity
During the cap stage
As a result of the apposition of cementum over dentin

30. What are the clinical ramifications of anodontia?
Outer
Proliferation - differentiation - morphogenesis
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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

31. What happens during the maturation stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Epithelial rests of Malassez
Dental tissues fully mineralize to their mature levels.
There are none - they are lost with eruption

32. What is the cementum matrix called?
Cementoid
In the cap stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

33. The stellate reticulum is located inner or outer?
The enamel - dentin - and cementum are secreted in successive layers
The cementum - PDL - and alveolar bone
Outer
Epithelial

34. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
The cementum - PDL - and alveolar bone
Dental tissues secreted as matrix in successive layers.
Dental papilla

35. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Tooth germ tries to divide
In the cap stage
Epithelial rests of Malassez
Abnormally large teeth

36. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
There are none - they are lost with eruption
The basement membrane that seperates the enamel organ and dental papilla
Epithelial

37. What is the main process involved in initiation?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction
Tooth germ
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

38. What stage does the dental tissues subsequently fully mineralize
Maturation
During the cap stage
In the cap stage
Sphere of enamel on root

39. What is gemination?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The actual vertical movement of the tooth
Hereditary in localized form. endocrine dysfunction is complete
Tooth germ tries to divide

40. What are the formative cells for cementum?
The bud stage
Common with permanent maxillary molars
Cementoblasts
The ectomesenchyme - which was influenced by the neural crest cells

41. What are the odontoblastic processes is contained in what?
The enamel organ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Faulty development of enamel from interference involving ameloblasts
A mineralized cylinder - the dentinal tubule

42. What will the outer cells of the dental lamina differentiate into?
Arrest and reversal lines
Dentin secreting cells (odontoblats)
The cementum - PDL - and alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

43. What are the formative cells for alveolar bone?
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
Arrest and reversal lines
There are none - they are lost with eruption
Osteoblasts

44. How is the dentinocemental junction formed?
4 types
Odontoblastic process
Epithelial
As a result of the apposition of cementum over dentin

45. What kind of cells occur in the outer enamel epithelium in the bell stage?
When the gingiva recedes and no actual tooth movement takes place
The ectomesenchyme
Cuboidal cells
Odontoblasts

46. What are the clinical ramifications of fusion?
Extra cusp due to effects on enamel organ
Odontogenesis
Cementocytes
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

47. What happens during the appositional stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Connective
The enamel - dentin - and cementum are secreted in successive layers
Common with permanent maxillary molars

48. The stratum intermediate is located inner or outer?
Inner
The bud stage
The ectomesenchyme
Tooth germ

49. What are the clinical ramifications of gemination?

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50. What is the predominate process in the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
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
Differentiation

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Dentistry Tooth Development And Eruption

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