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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. Active eruption
Preameloblasts
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 actual vertical movement of the tooth
4 types

2. What kind of cells occur in the inner enamel epithelium?
Compressed layer of flat to cuboidal cells
Lines of Retzuis
Only dentinal tubules with processes
Tall columnar cells

3. Where is the dental sac originally derived from?
The enamel organ is compressed
The ectomesenchyme
Local or systemic or hereditary
Enamel organ

4. The preameloblasts induce dental papilla cells to differentiate into what?
Only dentinal tubules with processes
Into odontoblasts
Cementoid
Inner

5. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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
During the cap stage
Maturation

6. What are the formative cells for cementum?
The basement membrane that seperates the enamel organ and dental papilla
9th to 10th weeks
Cementoblasts
There are none - they are lost with eruption

7. What is gemination?
Tooth germ tries to divide
Future dentin and pulp tissue
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dentin secreting cells (odontoblats)

8. What processes are involved with the apposition stage?
Induction - proliferation
The ectomesenchyme
Apposition of the cementum
Sphere of enamel on root

9. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Trauma - pressure or metabolic disease
Maturation
The ectomesenchyme
Odontoblastic process

10. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The cementum - PDL - and alveolar bone
Dental tissues fully mineralize to their mature levels.
Abnormally large teeth
Preameloblasts

11. What is the main process involved in initiation?
Induction
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
8th week
Common on permanent molars or cingulum of anterior teeth

12. What is matrix?
Inner
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dens in dente - gemination - tubercle - and fusion
Future dentin and pulp tissue

13. What is the process involved in the maturation stage?
4 types
The primordium of the pulp
Maturation
There are none - they are lost with eruption

14. What are supernumerary teeth?
Oral epithelium
Development of one or more extra teeth
A mineralized cylinder - the dentinal tubule
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

15. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontoclasts
A mineralized cylinder - the dentinal tubule
The basement membrane

16. Do odontoblasts start their secretion of matrix before the ameloblasts?
Outer
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Extra cusp due to effects on enamel organ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

17. What is the predominate process in the bell stage?
Differentiation
Induction - proliferation
Cementocytes
Epithelial

18. What are the incremental lines for enamel?
Enamel organ
Dental tissues secreted as matrix in successive layers.
The dental lamina
Lines of Retzuis

19. When does macro/microdontia occur?
A bilayer rim that consists only IEE and OEE
Bud stage
Dental follicle
There is unequal growth in different parts of the tooth bud

20. The stellate reticulum is located inner or outer?
4 types
Hereditary in localized form. endocrine dysfunction is complete
Enamel organ
Outer

21. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Future dentin and pulp tissue
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 outer cells of the dental papilla and the central cells of the dental papilla
The outer enamel epithelium

22. What kind of cells reside in the stratum intermediate?
Oral epithelium
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
Compressed layer of flat to cuboidal cells
Cementoblasts

23. What are the clinical ramifications of enamel dysplasia?
Common on permanent molars or cingulum of anterior teeth
Extra cusp due to effects on enamel organ
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Commonly involves permanent maxillary lateral incisor and 3rd molars

24. When does the process of root development take place?
Trauma - pressure or metabolic disease
Inner
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Only dentinal tubules with processes

25. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
During the cap stage
Pressure on the area
Epithelial

26. Which layer in the bell stage has star shaped cells?
The stellate reticulum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Tall columnar cells
Union of root structure of two or more teeth by cementum

27. What are the clinical ramifications of concrescence?
Connective
Common on permanent molars or cingulum of anterior teeth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Common with permanent maxillary molars

28. What are the formative cells for dentin?
Osteocytes
The basement membrane
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontoblasts

29. What is the cap in the cap stage?
The enamel organ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Alveolar bone

30. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Dens in dente - gemination - tubercle - and fusion
Cementoblasts
Outer
Development of one or more extra teeth

31. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Differentiation
The enamel - dentin - and cementum are secreted in successive layers
A bilayer rim that consists only IEE and OEE

32. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Common on permanent molars or cingulum of anterior teeth
Tall columnar cells
A mineralized cylinder - the dentinal tubule

33. What is microdontia?
Sphere of enamel on root
Abnormally small teeth
Epithelial rests of Malassez
Compressed layer of flat to cuboidal cells

34. What is the site for the future dentioenamel junction?
Bud stage
During the cap stage
The basement membrane that seperates the enamel organ and dental papilla
The actual vertical movement of the tooth

35. What are the etiological factors for anodontia?
Bud stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

36. What layer serves as protection for the enamel organ?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Enamel secreting cells (ameloblasts)
The outer enamel epithelium
Morphogenesis

37. What are the clinical ramifications of gemination?

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38. The stratum intermediate is located inner or outer?
Inner
The basement membrane
Proliferation - differentiation - morphogenesis
Apposition of the cementum

39. What happens during the cap stage?
Cementoblasts
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 ectoderm
Morphogenesis

40. What are the clinical ramifications of micro/macrodontia?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Pressure on the area
Cementoid
Commonly involves permanent maxillary lateral incisor and 3rd molars

41. What is macrodontia?
Abnormally large teeth
May be confused as calculus deposit on root
Inner
Outer

42. What are the etiological factors for supernumerary teeth?
As a result of the apposition of cementum over dentin
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Morphogenesis
Hereditary

43. Where is the enamal organ originally derived from?
Apposition of the cementum
Into odontoblasts
Cementoblasts
The ectoderm

44. When does dens in dente occur?
Into odontoblasts
The basement membrane that seperates the enamel organ and dental papilla
Arrest and reversal lines
During the cap stage

45. Tooth development
Lines of Retzuis
Initiation stage
Odontogenesis
Inner

46. What happens during the apposition stage?
Odontoblasts
Dental tissues secreted as matrix in successive layers.
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 secreting cells (odontoblats)

47. What are the mature cells for dentin?
Ameloblasts
The tooth germ
Only dentinal tubules with processes
Maturation

48. 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
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Initiation
Common with permanent maxillary molars

49. What is the structure responsible for root development?
Tooth germ tries to divide
Tooth germ
A mineralized cylinder - the dentinal tubule
The cervical loop

50. What stage does supernumerary teeth occur?
Dental papilla
Initiation
Differentiation
Proliferation - differentiation - morphogenesis