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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. What are the development disturbances of the apposition and maturation stages?
Odontoclasts
8th week
Compressed layer of flat to cuboidal cells
Enamel pearl - enamel dysplasia - and concresence

2. What is concrescence?
There are none - they are lost with eruption
Extra cusp due to effects on enamel organ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Union of root structure of two or more teeth by cementum

3. What is the process involved in the maturation stage?
6th to 7th weeks
Maturation
Abnormally small teeth
Imbrication lines of von Ebner

4. What happens during the cap stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Compressed layer of flat to cuboidal cells
6th to 7th weeks
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.

5. What stage does anodontia occur?
The cervical loop
Compressed layer of flat to cuboidal cells
Dentin secreting cells (odontoblats)
Initiation stage

6. The preameloblasts induce dental papilla cells to differentiate into what?
Outer
Into odontoblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The primordium of the pulp

7. What is microdontia?
Alveolar bone
The tooth germ
Abnormally small teeth
6th to 7th weeks

8. What happens during initiation?
Osteoblasts
Tooth germ
Extra cusp due to effects on enamel organ
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

9. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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
Enamel organ
There are none - they are lost with eruption

10. What is fusion?
Epithelial rests of Malassez
Union of 2 adjacent tooth germs
The ectoderm
A mineralized cylinder - the dentinal tubule

11. What is the main process involved in the bud stage?
Local or systemic or hereditary
Proliferation
Enamel secreting cells (ameloblasts)
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

12. What are the incremental lines for enamel?
The basement membrane
There are none - they are lost with eruption
Lines of Retzuis
The stellate reticulum

13. What will the inner cells of the dental lamina differentiates into?
The ectomesenchyme - which was influenced by the neural crest cells
Induction - proliferation
Faulty development of enamel from interference involving ameloblasts
The primordium of the pulp

14. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The bud stage
Common with permanent maxillary molars
Cementoblasts

15. When does macro/microdontia occur?
Epithelial rests of Malassez
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
Bud stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

16. In the cap stage the tooth bud does not grow - 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.
There is unequal growth in different parts of the tooth bud
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The outer cells of the dental papilla and the central cells of the dental papilla

17. What is another name for the dental sac?
There is unequal growth in different parts of the tooth bud
Epithelial
Dental follicle
The ectomesenchyme

18. What does the cervical loop consist of?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Initiation
A bilayer rim that consists only IEE and OEE

19. What are the etiological factors for enamel pearl?
Inner
It disintegrates as the developing oral mucosa comes to line the oral cavity
Displacement of ameloblasts to root surface
Arrest and reversal lines

20. What are the etiological factors of tubercle?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Trauma - pressure or metabolic disease
Alveolar bone
Sphere of enamel on root

21. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
There are none - they are lost with eruption
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dental papilla
Connective

22. What type of tissue is dentin - cementum - and alveolar bone?
Into odontoblasts
Connective
Future dentin and pulp tissue
During the cap stage

23. What are the formative cells for cementum?
4 types
Dentin secreting cells (odontoblats)
Cementoblasts
Induction

24. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Initiation
Union of 2 adjacent tooth germs
Apposition of the cementum

25. What are the mature cells for dentin?
The outer cells of the dental papilla and the central cells of the dental papilla
Abnormally small teeth
Extra cusp due to effects on enamel organ
Only dentinal tubules with processes

26. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Displacement of ameloblasts to root surface
The basement membrane
The ectomesenchyme

27. What is the time span for the cap stage?
11th to 12th weeks
9th to 10th weeks
A mineralized cylinder - the dentinal tubule
The enamel organ - dental papilla - dental sac

28. What will the dental sac give rise to?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The cementum - PDL - and alveolar bone
The permanent molars
Maturation

29. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Abnormally small teeth

30. What hard tissue is can not have tissue formation after eruption?
Union of 2 adjacent tooth germs
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel
Epithelial

31. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoblasts
Differentiation
Tooth germ tries to divide

32. What are the clinical ramifications of dens in dente?
Initiation stage
Epithelial rests of Malassez
8th week
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

33. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Apposition of the cementum
Union of root structure of two or more teeth by cementum

34. What is macrodontia?
Into odontoblasts
Abnormally large teeth
Hereditary
Cementocytes

35. What are the clinical ramifications of gemination?

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36. When does dens in dente occur?
As a result of the apposition of cementum over dentin
The ectomesenchyme
During the cap stage
The enamel organ is compressed

37. What are supernumerary teeth?
Cementocytes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Imbrication lines of von Ebner
Development of one or more extra teeth

38. What are the major components of the tooth germ?
The permanent molars
Tall columnar cells
The enamel organ - dental papilla - dental sac
Hereditary

39. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The basement membrane
8th week
Odontoblastic process
Local or systemic or hereditary

40. What processes are involved with the apposition stage?
Induction - proliferation
Odontoblastic process
The outer cells of the dental papilla and the central cells of the dental papilla
Displacement of ameloblasts to root surface

41. What is the site for the future dentioenamel junction?
Ameloblasts
The basement membrane
Extra cusp due to effects on enamel organ
The basement membrane that seperates the enamel organ and dental papilla

42. What is the time span for initiation?
Common with permanent maxillary molars
6th to 7th weeks
9th to 10th weeks
The bud stage

43. How is the reduced enamel epithelium created?
Pressure on the area
8th week
The enamel organ is compressed
Tooth germ tries to divide

44. What is the cap in the cap stage?
The enamel organ
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction
Enamel secreting cells (ameloblasts)

45. Which teeth are nonsuccedaneous?
Morphogenesis
The permanent molars
The ameloblasts
11th to 12th weeks

46. What will the dental papilla eventually form?
Future dentin and pulp tissue
In the cap stage
Enamel pearl - enamel dysplasia - and concresence
Outer

47. What is the time span for the bud stage?
Odontoblasts
8th week
The cervical loop
Bud stage

48. What is the cementum matrix called?
Cementoid
Dental papilla
Osteoblasts
Imbrication lines of von Ebner

49. What do the odontoblasts do?
Enamel pearl - enamel dysplasia - and concresence
Preameloblasts
Lines of Retzuis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

50. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Future dentin and pulp tissue
In the cap stage
The cementum - PDL - and alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity