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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. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Oral epithelium
Induction - proliferation
11th to 12th weeks
Odontoclasts

2. What is tubercle?
Extra cusp due to effects on enamel organ
Induction
The apposition of the enamel matrix
During the cap stage

3. What is another name for the dental sac?
Dental follicle
Enamel
Proliferation - differentiation - morphogenesis
Hereditary

4. Passive eruption
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
When the gingiva recedes and no actual tooth movement takes place
A mineralized cylinder - the dentinal tubule
Maturation

5. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Sphere of enamel on root
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Abnormally small teeth
Odontoblastic process

6. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
The bud stage
The stellate reticulum
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

7. 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
May be confused as calculus deposit on root
The ameloblasts
Apposition of the cementum

8. What happens during the appositional stage?
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
Extra cusp due to effects on enamel organ
The enamel - dentin - and cementum are secreted in successive layers

9. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Pressure on the area
Odontoblasts
Initiation stage

10. What are the clinical ramifications of anodontia?
Tall columnar cells
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Abnormally small teeth
Maturation

11. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel - dentin - and cementum are secreted in successive layers
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
There are none - they are lost with eruption

12. Which layer in the bell stage has star shaped cells?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Absence of single or multiple teeth
11th to 12th weeks
The stellate reticulum

13. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
The ectomesenchyme
Common with permanent maxillary molars
Bud stage

14. What is the time span for the bell stage?
Union of 2 adjacent tooth germs
Ameloblasts
11th to 12th weeks
Trauma - pressure or metabolic disease

15. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Connective
Osteoblasts
11th to 12th weeks

16. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
The stellate reticulum
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

17. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
The enamel organ - dental papilla - dental sac
The bud stage
Odontoblasts

18. What is the time span for the bud stage?
8th week
The basement membrane
Traumatic injury or crowding of teeth
Enamel

19. What is enamel dysplasia?
Cuboidal cells
Dental papilla
6th to 7th weeks
Faulty development of enamel from interference involving ameloblasts

20. What stage does supernumerary teeth occur?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Common on permanent molars or cingulum of anterior teeth
Initiation
Lines of Retzuis

21. What is gemination?
Tooth germ tries to divide
Preameloblasts
Sphere of enamel on root
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

22. Where is the enamal organ originally derived from?
The basement membrane that seperates the enamel organ and dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Local or systemic or hereditary
The ectoderm

23. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
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
Future dentin and pulp tissue
Tooth germ
Alveolar bone

24. What are the mature cells for cementum?
Arrest and reversal lines
Pressure on the area
Cementocytes
Odontogenesis

25. How is the reduced enamel epithelium created?
Initiation
The enamel organ is compressed
Local or systemic or hereditary
Dental tissues fully mineralize to their mature levels.

26. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Alveolar bone
The basement membrane
6th to 7th weeks
Dental tissues fully mineralize to their mature levels.

27. What processes are involved with the apposition stage?
Dentin secreting cells (odontoblats)
Induction - proliferation
Morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

28. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Bud stage
The ectoderm
Differentiation

29. What is the main process involved in the bud stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Proliferation
Abnormally large teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

30. What is the site for the future dentioenamel junction?
Lines of Retzuis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The basement membrane that seperates the enamel organ and dental papilla
The bud stage

31. What are the etiological factors for fusion?
Initiation stage
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
There is unequal growth in different parts of the tooth bud
Pressure on the area

32. What is the outer portion of the ectoderm in the initiation stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Oral epithelium
Displacement of ameloblasts to root surface

33. What is the predominate process of the cap stage?
Dental papilla
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.
6th to 7th weeks
Morphogenesis

34. The oral epithelium is induced by the ectomesenchyme to produce what?
Cementoid
The dental lamina
Morphogenesis
Lines of Retzuis

35. What is concrescence?
Tooth germ tries to divide
Union of root structure of two or more teeth by cementum
The enamel organ is compressed
As a result of the apposition of cementum over dentin

36. What are the clinical ramifications of enamel dysplasia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Abnormally large teeth
There is unequal growth in different parts of the tooth bud

37. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Sphere of enamel on root
Maturation
Cementoblasts

38. What is the time span for initiation?
6th to 7th weeks
Abnormally large teeth
Cementocytes
The ectomesenchyme

39. What is the primordium of the tooth?
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
The tooth germ
Outer
6th to 7th weeks

40. What happens during the bud stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary in localized form. endocrine dysfunction is complete
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Epithelial

41. Where is the dental sac originally derived from?
The ectomesenchyme
Osteoblasts
The actual vertical movement of the tooth
The basement membrane

42. What are the etiological factors of tubercle?
Dens in dente - gemination - tubercle - and fusion
4 types
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Trauma - pressure or metabolic disease

43. What happens during the cap stage?
Sphere of enamel on root
Arrest and reversal lines
Odontoblasts
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.

44. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The enamel organ
Epithelial rests of Malassez
The basement membrane that seperates the enamel organ and dental papilla
Arrest and reversal lines

45. When does the tooth bud become a tooth germ?
Initiation
In the cap stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The apposition of the enamel matrix

46. What is anodontia?
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
Imbrication lines of von Ebner
Absence of single or multiple teeth
Cuboidal cells

47. 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
4 types
The enamel organ
As a result of the apposition of cementum over dentin

48. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Traumatic injury or crowding of teeth
The ectomesenchyme - which was influenced by the neural crest cells
8th week
The dental sac

49. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
The ectomesenchyme - which was influenced by the neural crest cells
Proliferation
The actual vertical movement of the tooth

50. What is the cap in the cap stage?
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
Hereditary
The enamel organ
Cementocytes