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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. Which layer in the bell stage has star shaped cells?
Epithelial
The stellate reticulum
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

2. What is matrix?
Hereditary
The dental lamina
As a result of the apposition of cementum over dentin
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

3. What are the mature cells for alveolar bone?
Sphere of enamel on root
Osteocytes
In the cap stage
The ectomesenchyme

4. What stage does anodontia occur?
Enamel organ
Proliferation
Initiation stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

5. What happens during initiation?
The primordium of the pulp
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Inner
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

6. What are the mature cells for enamel?
The apposition of the enamel matrix
Osteoblasts
There are none - they are lost with eruption
The permanent molars

7. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Displacement of ameloblasts to root surface
The ameloblasts

8. When does dens in dente occur?
The enamel - dentin - and cementum are secreted in successive layers
Into odontoblasts
Oral epithelium
During the cap stage

9. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Local or systemic or hereditary
The basement membrane
Cuboidal cells

10. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel organ - dental papilla - dental sac
Cuboidal cells
Tooth germ

11. What is amelogenisis?
Tooth germ tries to divide
Sphere of enamel on root
The apposition of the enamel matrix
The primordium of the pulp

12. What are the clinical ramifications of fusion?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

13. What stage does the dental tissues subsequently fully mineralize
Cuboidal cells
Maturation
Dental papilla
Traumatic injury or crowding of teeth

14. When does the tooth bud become a tooth germ?
Oral epithelium
Common on permanent molars or cingulum of anterior teeth
Maturation
In the cap stage

15. What are the incremental lines for dentin?
Initiation stage
Induction
Imbrication lines of von Ebner
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

16. What are the formative cells for cementum?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementoblasts
The outer cells of the dental papilla and the central cells of the dental papilla
Osteoblasts

17. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Inner
Cementocytes
Odontoclasts
The cervical loop

18. What is the main process involved in initiation?
The ectomesenchyme
Epithelial rests of Malassez
The enamel organ - dental papilla - dental sac
Induction

19. What is the primordium of the tooth?
Trauma - pressure or metabolic disease
11th to 12th weeks
The tooth germ
Tooth germ tries to divide

20. What stage does supernumerary teeth occur?
Odontoblastic process
In the cap stage
Preameloblasts
Initiation

21. Tooth development
Odontogenesis
Dental papilla
The basement membrane that seperates the enamel organ and dental papilla
Morphogenesis

22. What are the clinical ramifications of enamel dysplasia?
The enamel - dentin - and cementum are secreted in successive layers
Odontogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dental tissues secreted as matrix in successive layers.

23. What processes are involved in the bell stage?
The outer cells of the dental papilla and the central cells of the dental papilla
Differentiation - proliferation - morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Lines of Retzuis

24. What happens when the reduced enamel epithelium is created?
Odontoclasts
Maturation
Dental papilla
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

25. What else undergoes proliferation in the bud stage besides the dental lamina?
Dental papilla
The ectomesenchyme
The enamel organ
The cementum - PDL - and alveolar bone

26. What are the odontoblastic processes is contained in what?
The cementum - PDL - and alveolar bone
A mineralized cylinder - the dentinal tubule
Induction
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

27. What is anodontia?
Absence of single or multiple teeth
The primordium of the pulp
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Epithelial rests of Malassez

28. What are the etiological factors of concrescence?
Extra cusp due to effects on enamel organ
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Traumatic injury or crowding of teeth
Hereditary

29. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The cervical loop
Displacement of ameloblasts to root surface
The enamel organ is compressed
Cementoblasts

30. When does the process of root development take place?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Sphere of enamel on root
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
As a result of the apposition of cementum over dentin

31. Which teeth are nonsuccedaneous?
Dental papilla
Outer
Enamel pearl - enamel dysplasia - and concresence
The permanent molars

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

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33. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The enamel - dentin - and cementum are secreted in successive layers
Dental papilla
Oral epithelium
Union of 2 adjacent tooth germs

34. What is the predominate process of the cap stage?
Morphogenesis
Dental tissues fully mineralize to their mature levels.
Cementocytes
Maturation

35. What is the function of the Hertwig's epithelial root sheath?
The enamel organ
Maturation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Initiation

36. What will the inner cells of the dental lamina differentiates into?
Odontoblasts
The primordium of the pulp
Absence of single or multiple teeth
Union of root structure of two or more teeth by cementum

37. What is the structure responsible for root development?
Cementocytes
Maturation
The cervical loop
Ameloblasts

38. What is fusion?
Induction - proliferation
Imbrication lines of von Ebner
Cuboidal cells
Union of 2 adjacent tooth germs

39. What are the etiological factors for micro/macrodontia?
The apposition of the enamel matrix
Hereditary in localized form. endocrine dysfunction is complete
The ameloblasts place an acellular dental cuticle on the new enamel surface
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

40. What is the time span for the cap stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
9th to 10th weeks
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dentin secreting cells (odontoblats)

41. What hard tissue is innervated by nerves?
Dental tissues secreted as matrix in successive layers.
Cuboidal cells
Dentin and alveolar bone
During the cap stage

42. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Lines of Retzuis
Odontoblasts
Preameloblasts

43. What is the time span for the bell stage?
11th to 12th weeks
Enamel secreting cells (ameloblasts)
Cementoblasts
Maturation

44. What wll the inner enamel epithelium differentiate into?
Dental tissues secreted as matrix in successive layers.
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Sphere of enamel on root
Enamel secreting cells (ameloblasts)

45. What is enamel dysplasia?
Cementocytes
Faulty development of enamel from interference involving ameloblasts
Cuboidal cells
Enamel organ invaginates into the dental papilla

46. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Preameloblasts
The dental lamina
Hereditary in localized form. endocrine dysfunction is complete

47. What is the site for the future dentioenamel junction?
Cementoblasts
Pressure on the area
The basement membrane that seperates the enamel organ and dental papilla
Bud stage

48. Where is the dental papilla originally derived from?
Initiation stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The ectomesenchyme - which was influenced by the neural crest cells
Abnormally small teeth

49. Where is the dental sac originally derived from?
Tall columnar cells
Cementocytes
The ectomesenchyme
Enamel

50. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Cuboidal cells
The ectomesenchyme
Enamel organ