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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. Active eruption
Dental tissues fully mineralize to their mature levels.
The enamel organ
The actual vertical movement of the tooth
The outer enamel epithelium

2. What will the inner cells of the dental lamina differentiates into?
Enamel organ invaginates into the dental papilla
Initiation
The primordium of the pulp
Dentin secreting cells (odontoblats)

3. What is macrodontia?
Enamel pearl - enamel dysplasia - and concresence
Abnormally large teeth
The ameloblasts
The permanent molars

4. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Tooth germ
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Only dentinal tubules with processes

5. What processes are involved with the apposition stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction - proliferation
Trauma - pressure or metabolic disease
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

6. What is another name for the dental sac?
The dental sac
When the gingiva recedes and no actual tooth movement takes place
Initiation stage
Dental follicle

7. What processes are involved in the bell stage?
Cementoblasts
Dental papilla
Maturation
Differentiation - proliferation - morphogenesis

8. Where is the dental sac originally derived from?
Hereditary
Osteoblasts
The ectomesenchyme
Odontoblasts

9. What type of tissue is enamel?
Trauma - pressure or metabolic disease
Odontogenesis
Dental papilla
Epithelial

10. What is cementogenisis?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Enamel organ invaginates into the dental papilla
A mineralized cylinder - the dentinal tubule
Apposition of the cementum

11. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction
Enamel organ
Odontogenesis

12. What is concrescence?
The basement membrane that seperates the enamel organ and dental papilla
Union of root structure of two or more teeth by cementum
Initiation
May be confused as calculus deposit on root

13. What stage does the dental tissues subsequently fully mineralize
Maturation
Tooth germ
Preameloblasts
May be confused as calculus deposit on root

14. What are the mature cells for enamel?
Into odontoblasts
Cementocytes
Induction
There are none - they are lost with eruption

15. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
4 types
Dens in dente - gemination - tubercle - and fusion
Abnormally small teeth

16. What is the outer portion of the ectoderm in the initiation stage?
Abnormally large teeth
Trauma - pressure or metabolic disease
The enamel organ
Oral epithelium

17. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The dental lamina
Oral epithelium
The basement membrane
Extra cusp due to effects on enamel organ

18. What is matrix?
Tooth germ tries to divide
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Tooth germ
8th week

19. What are the clinical ramifications?
When the gingiva recedes and no actual tooth movement takes place
The outer cells of the dental papilla and the central cells of the dental papilla
Epithelial
Common on permanent molars or cingulum of anterior teeth

20. What hard tissue is innervated by nerves?
Dental follicle
Hereditary
Dentin and alveolar bone
Compressed layer of flat to cuboidal cells

21. What kind of cells occur in the inner enamel epithelium?
Dental papilla
The enamel organ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Tall columnar cells

22. What happens during initiation?
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.
Dentin and 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

23. What happens during the maturation stage?
The stellate reticulum
Dental tissues fully mineralize to their mature levels.
The basement membrane
Inner

24. What is the time span for initiation?
6th to 7th weeks
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The outer enamel epithelium
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

25. What are succedaneous teeth?
Dentin and alveolar bone
11th to 12th weeks
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel

26. What are the etiological factors for dens in dente and gemination?
Dental tissues fully mineralize to their mature levels.
Union of 2 adjacent tooth germs
Hereditary
9th to 10th weeks

27. What are the etiological factors for supernumerary teeth?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
A bilayer rim that consists only IEE and OEE
Hereditary
Dens in dente - gemination - tubercle - and fusion

28. 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
Epithelial rests of Malassez
The dental sac
Dentin and alveolar bone

29. What happens during the bell stage?
Hereditary
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Proliferation - differentiation - morphogenesis
Future dentin and pulp tissue

30. What are the clinical ramifications of concrescence?
Epithelial
Ameloblasts
Common with permanent maxillary molars
Connective

31. What will the dental sac give rise to?
The dental sac
Pressure on the area
The cementum - PDL - and alveolar bone
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

32. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

33. What will the dental papilla eventually form?
Dentin secreting cells (odontoblats)
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Future dentin and pulp tissue
8th week

34. What is the time span for the bud stage?
The enamel organ - dental papilla - dental sac
In the cap stage
8th week
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

35. 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
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
Hereditary
Epithelial rests of Malassez

36. The stratum intermediate is located inner or outer?
Dentin secreting cells (odontoblats)
The bud stage
The ameloblasts
Inner

37. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
There is unequal growth in different parts of the tooth bud
The bud stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

38. What are the formative cells for alveolar bone?
The ectomesenchyme - which was influenced by the neural crest cells
Enamel organ
Odontoclasts
Osteoblasts

39. What are the mature cells for alveolar bone?
Dental papilla
The stellate reticulum
Osteocytes
Dental follicle

40. What are the mature cells for cementum?
Cementocytes
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Odontoclasts
Enamel

41. What is the time span for the bell stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Epithelial rests of Malassez
11th to 12th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

42. What is the predominate process of the cap stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Morphogenesis
11th to 12th weeks
Initiation stage

43. What is the predominate process in the bell stage?
Apposition of the cementum
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementocytes
Differentiation

44. What is the cap in the cap stage?
The basement membrane
In the cap stage
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.
The enamel organ

45. When does dens in dente occur?
The basement membrane that seperates the enamel organ and dental papilla
Maturation
During the cap stage
Union of 2 adjacent tooth germs

46. Where does the primordium of the permanent dentition develop?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontoblastic process
The basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

47. What stage does supernumerary teeth occur?
Hereditary
Union of 2 adjacent tooth germs
Initiation
The primordium of the pulp

48. What kind of cells occur in the outer enamel epithelium in the bell stage?
During the cap stage
Alveolar bone
Cuboidal cells
Abnormally small teeth

49. What is microdontia?
Abnormally small teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dens in dente - gemination - tubercle - and fusion
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

50. What do the odontoblasts do?
Osteoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane