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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Extra cusp due to effects on enamel organ
Enamel organ invaginates into the dental papilla
Dental follicle

2. What hard tissue is can not have tissue formation after eruption?
Union of 2 adjacent tooth germs
There is unequal growth in different parts of the tooth bud
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel

3. When does the tooth bud become a tooth germ?
In the cap stage
Morphogenesis
Hereditary
The bud stage

4. What is the primordium of the tooth?
The enamel organ is compressed
The tooth germ
Differentiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

5. What happens during the bell stage?
Enamel secreting cells (ameloblasts)
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Outer
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

6. What is the cementum matrix called?
Cementoid
9th to 10th weeks
Tooth germ
Compressed layer of flat to cuboidal cells

7. What is the process involved in the maturation stage?
8th week
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
Maturation
The basement membrane

8. What are the incremental lines for enamel?
Dentin secreting cells (odontoblats)
Odontoblasts
Lines of Retzuis
The ameloblasts

9. What is the time span for the bud stage?
8th week
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Epithelial rests of Malassez
The bud stage

10. What will the outer cells of the dental lamina differentiate into?
Hereditary
The enamel organ
Dentin secreting cells (odontoblats)
Union of 2 adjacent tooth germs

11. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Tall columnar cells
Hereditary in localized form. endocrine dysfunction is complete
Odontoclasts

12. What is enamel dysplasia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dentin secreting cells (odontoblats)
Maturation
Faulty development of enamel from interference involving ameloblasts

13. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Cementoid
As a result of the apposition of cementum over dentin
Cementocytes
Epithelial rests of Malassez

14. What is dens in dente?
Cementocytes
Enamel organ invaginates into the dental papilla
Induction
A mineralized cylinder - the dentinal tubule

15. What is the cap in the cap stage?
The enamel organ
In the cap stage
Tooth germ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

16. When does macro/microdontia occur?
Bud stage
9th to 10th weeks
Connective
When the gingiva recedes and no actual tooth movement takes place

17. 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
Faulty development of enamel from interference involving ameloblasts
Union of 2 adjacent tooth germs
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

18. What are the clinical ramifications of concrescence?
The outer enamel epithelium
Common with permanent maxillary molars
Ameloblasts
Inner

19. What stage does anodontia occur?
Initiation stage
Development of one or more extra teeth
Dentin secreting cells (odontoblats)
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

20. How is the dentinocemental junction formed?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
As a result of the apposition of cementum over dentin
A bilayer rim that consists only IEE and OEE
The enamel - dentin - and cementum are secreted in successive layers

21. What is fusion?
The outer cells of the dental papilla and the central cells of the dental papilla
Dentin and alveolar bone
Local or systemic or hereditary
Union of 2 adjacent tooth germs

22. When does dens in dente occur?
The enamel organ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
During the cap stage
Alveolar bone

23. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Compressed layer of flat to cuboidal cells
The basement membrane
Absence of single or multiple teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars

24. What is the site for the future dentioenamel junction?
Dental tissues secreted as matrix in successive layers.
Connective
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The basement membrane that seperates the enamel organ and dental papilla

25. Where is the enamal organ originally derived from?
The enamel organ
The ectoderm
Compressed layer of flat to cuboidal cells
Cementoid

26. What is another name for the dental sac?
Dental follicle
Into odontoblasts
Enamel secreting cells (ameloblasts)
Maturation

27. What are the clinical ramifications of enamel pearl?
When the gingiva recedes and no actual tooth movement takes place
May be confused as calculus deposit on root
Sphere of enamel on root
The enamel organ

28. What is macrodontia?
The ectomesenchyme - which was influenced by the neural crest cells
Morphogenesis
Abnormally large teeth
Arrest and reversal lines

29. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Common on permanent molars or cingulum of anterior teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Differentiation
The basement membrane

30. What are the etiological factors of tubercle?
The permanent molars
Trauma - pressure or metabolic disease
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

31. Tooth development
Odontogenesis
Compressed layer of flat to cuboidal cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

32. What else undergoes proliferation in the bud stage besides the dental lamina?
Faulty development of enamel from interference involving ameloblasts
A bilayer rim that consists only IEE and OEE
Preameloblasts
The ectomesenchyme

33. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The cementum - PDL - and alveolar bone

34. What is amelogenisis?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ectomesenchyme
The apposition of the enamel matrix
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

35. What happens during the appositional stage?
Preameloblasts
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
The basement membrane

36. What are entrapped cementoblasts called?
Cementocytes
A mineralized cylinder - the dentinal tubule
The ectoderm
Common on permanent molars or cingulum of anterior teeth

37. What does the cervical loop consist of?
Epithelial
The basement membrane
Trauma - pressure or metabolic disease
A bilayer rim that consists only IEE and OEE

38. The oral epithelium is induced by the ectomesenchyme to produce what?
Bud stage
The dental lamina
Enamel pearl - enamel dysplasia - and concresence
Only dentinal tubules with processes

39. What are the mature cells for dentin?
Only dentinal tubules with processes
Extra cusp due to effects on enamel organ
Enamel
May be confused as calculus deposit on root

40. Do odontoblasts start their secretion of matrix before the ameloblasts?
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
Differentiation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel pearl - enamel dysplasia - and concresence

41. What are the development disturbances of the apposition and maturation stages?
Local or systemic or hereditary
Differentiation - proliferation - morphogenesis
There are none - they are lost with eruption
Enamel pearl - enamel dysplasia - and concresence

42. What are the formative cells for dentin?
Osteocytes
Hereditary in localized form. endocrine dysfunction is complete
Odontoblasts
Development of one or more extra teeth

43. What happens during initiation?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dentin secreting cells (odontoblats)
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
Odontoblastic process

44. What is the main process involved in the bud stage?
The permanent molars
Enamel secreting cells (ameloblasts)
6th to 7th weeks
Proliferation

45. What are the etiological factors for enamel pearl?
Absence of single or multiple teeth
Displacement of ameloblasts to root surface
Enamel organ invaginates into the dental papilla
Ameloblasts

46. What is gemination?
Epithelial rests of Malassez
Oral epithelium
Tooth germ tries to divide
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

47. How is the reduced enamel epithelium created?
Alveolar bone
Arrest and reversal lines
The enamel organ is compressed
There is unequal growth in different parts of the tooth bud

48. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Hereditary
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Maturation

49. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Enamel pearl - enamel dysplasia - and concresence
Common on permanent molars or cingulum of anterior teeth
Development of one or more extra teeth

50. What are the mature cells for alveolar bone?
8th week
Osteocytes
Cementoblasts
Morphogenesis