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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 clinical ramifications of concrescence?
Union of 2 adjacent tooth germs
Induction - proliferation
Enamel organ
Common with permanent maxillary molars

2. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The cervical loop
Hereditary
The basement membrane
Displacement of ameloblasts to root surface

3. What is the predominate process of the cap stage?
Morphogenesis
The actual vertical movement of the tooth
Maturation
Compressed layer of flat to cuboidal cells

4. What is concrescence?
Union of root structure of two or more teeth by cementum
Enamel secreting cells (ameloblasts)
Dental papilla
The permanent molars

5. What do the odontoblasts do?
Cementoblasts
Imbrication lines of von Ebner
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

6. What is the time span for initiation?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental tissues secreted as matrix in successive layers.
The enamel - dentin - and cementum are secreted in successive layers
6th to 7th weeks

7. What is the primordium of the tooth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Lines of Retzuis
The tooth germ
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.

8. What are the etiological factors of tubercle?
The outer enamel epithelium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Apposition of the cementum
Trauma - pressure or metabolic disease

9. What happens during the bud stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Oral epithelium
Proliferation

10. What is the main process involved in the bud stage?
Proliferation
Compressed layer of flat to cuboidal cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

11. What will the dental sac give rise to?
The basement membrane
The cementum - PDL - and alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The primordium of the pulp

12. What is the time span for the cap stage?
9th to 10th weeks
Absence of single or multiple teeth
Hereditary in localized form. endocrine dysfunction is complete
Tooth germ

13. 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
11th to 12th weeks
Dental tissues fully mineralize to their mature levels.
Odontogenesis

14. What is dens in dente?
Enamel organ invaginates into the dental papilla
Extra cusp due to effects on enamel organ
Dental follicle
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

15. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ectomesenchyme
The primordium of the pulp
Only dentinal tubules with processes

16. What are the formative cells for alveolar bone?
The basement membrane
Imbrication lines of von Ebner
Osteoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

17. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
11th to 12th weeks
Epithelial
Enamel secreting cells (ameloblasts)
Tooth germ

18. What stage does anodontia occur?
Initiation stage
Union of root structure of two or more teeth by cementum
The outer enamel epithelium
Odontoclasts

19. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The cementum - PDL - and alveolar bone
Only dentinal tubules with processes
The stellate reticulum

20. What is the embryological background for enamel?
The cementum - PDL - and alveolar bone
The ectomesenchyme
The enamel organ
Enamel organ

21. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Common on permanent molars or cingulum of anterior teeth
The bud stage
Compressed layer of flat to cuboidal cells
In the cap stage

22. What are the formative cells for enamel?
There is unequal growth in different parts of the tooth bud
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.
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Ameloblasts

23. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Pressure on the area
Preameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

24. The stratum intermediate is located inner or outer?
Inner
6th to 7th weeks
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
8th week

25. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel secreting cells (ameloblasts)
The ectomesenchyme
Preameloblasts
The dental lamina

26. What are the incremental lines for cementum and alveolar bone?
Compressed layer of flat to cuboidal cells
Arrest and reversal lines
Odontoblasts
Epithelial rests of Malassez

27. What happens during the cap stage?
The ameloblasts
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.
Initiation
When the gingiva recedes and no actual tooth movement takes place

28. What is the cap in the cap stage?
The enamel organ
Bud stage
The cementum - PDL - and alveolar bone
Hereditary

29. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementocytes
8th week
Ameloblasts

30. What is the time span for the bud stage?
8th week
Cementoblasts
Enamel
Commonly involves permanent maxillary lateral incisor and 3rd molars

31. What hard tissue is can not have tissue formation after eruption?
Induction
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

32. What are the mature cells for dentin?
The enamel organ - dental papilla - dental sac
The enamel organ
Enamel organ
Only dentinal tubules with processes

33. Do odontoblasts start their secretion of matrix before the ameloblasts?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Proliferation

34. What is an enamel pearl?
Sphere of enamel on root
Common on permanent molars or cingulum of anterior teeth
Dental tissues secreted as matrix in successive layers.
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

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

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36. Which teeth are nonsuccedaneous?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The permanent molars
Development of one or more extra teeth

37. Where does the primordium of the permanent dentition develop?
The dental lamina
Hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Abnormally large teeth

38. What are the clinical ramifications of micro/macrodontia?
Induction - proliferation
Lines of Retzuis
Faulty development of enamel from interference involving ameloblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars

39. What happens when the reduced enamel epithelium is created?
Faulty development of enamel from interference involving ameloblasts
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
Osteoblasts
The cervical loop

40. What are the processes involved in the cap stage?
Cementocytes
The stellate reticulum
Proliferation - differentiation - morphogenesis
Dentin secreting cells (odontoblats)

41. What hard tissue is innervated by nerves?
Inner
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.
Dentin and alveolar bone
A mineralized cylinder - the dentinal tubule

42. 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
Initiation stage
The cervical loop
The outer cells of the dental papilla and the central cells of the dental papilla

43. What is the structure responsible for root development?
8th week
Dental papilla
Enamel
The cervical loop

44. The preameloblasts induce dental papilla cells to differentiate into what?
Apposition of the cementum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Into odontoblasts
Tall columnar cells

45. What is cementogenisis?
Morphogenesis
Epithelial rests of Malassez
Compressed layer of flat to cuboidal cells
Apposition of the cementum

46. What are the clinical ramifications of fusion?
Hereditary
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
The permanent molars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

47. What else undergoes proliferation in the bud stage besides the dental lamina?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ectomesenchyme
Epithelial rests of Malassez

48. How is the reduced enamel epithelium created?
The ectoderm
Trauma - pressure or metabolic disease
Pressure on the area
The enamel organ is compressed

49. The stellate reticulum is located inner or outer?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
In the cap stage
Outer

50. What is the process involved in the maturation stage?
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
Osteocytes
Maturation