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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 is the cementum matrix called?
Cementoid
Development of one or more extra teeth
Morphogenesis
Cuboidal cells

2. Active eruption
Initiation stage
Hereditary in localized form. endocrine dysfunction is complete
The enamel - dentin - and cementum are secreted in successive layers
The actual vertical movement of the tooth

3. What is the predominate process of the cap stage?
The cementum - PDL - and alveolar bone
Pressure on the area
Maturation
Morphogenesis

4. What is amelogenisis?
Traumatic injury or crowding of teeth
Common on permanent molars or cingulum of anterior teeth
Cementocytes
The apposition of the enamel matrix

5. What is dens in dente?
The ectoderm
Maturation
The basement membrane
Enamel organ invaginates into the dental papilla

6. What is microdontia?
In the cap stage
Enamel pearl - enamel dysplasia - and concresence
Abnormally small teeth
Hereditary

7. Passive eruption
Development of one or more extra teeth
When the gingiva recedes and no actual tooth movement takes place
Cementocytes
Initiation

8. What is the main process involved in the bud stage?
Proliferation
Sphere of enamel on root
The ectoderm
Dens in dente - gemination - tubercle - and fusion

9. What is cementogenisis?
Induction
Alveolar bone
Apposition of the cementum
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

10. What is the primordium of the tooth?
The tooth germ
The ectomesenchyme
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
A bilayer rim that consists only IEE and OEE

11. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Induction
Into odontoblasts
When the gingiva recedes and no actual tooth movement takes place

12. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Inner
The basement membrane

13. What is an enamel pearl?
Only dentinal tubules with processes
The basement membrane
Sphere of enamel on root
The enamel - dentin - and cementum are secreted in successive layers

14. What is fusion?
Dentin and alveolar bone
Union of 2 adjacent tooth germs
Connective
Odontogenesis

15. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Hereditary
Differentiation
The apposition of the enamel matrix

16. What happens during the appositional stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Union of 2 adjacent tooth germs
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 enamel - dentin - and cementum are secreted in successive layers

17. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Local or systemic or hereditary
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectomesenchyme

18. What are the etiological factors of tubercle?
The outer cells of the dental papilla and the central cells of the dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Trauma - pressure or metabolic disease

19. The stellate reticulum is located inner or outer?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The ectomesenchyme - which was influenced by the neural crest cells
Outer
There is unequal growth in different parts of the tooth bud

20. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Ameloblasts
The permanent molars
Hereditary

21. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Common on permanent molars or cingulum of anterior teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
Faulty development of enamel from interference involving ameloblasts
The basement membrane

22. What happens during the bud stage?
When the gingiva recedes and no actual tooth movement takes place
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ectoderm
Traumatic injury or crowding of teeth

23. Where is the dental sac originally derived from?
The ectomesenchyme
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
4 types
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

24. What type of tissue is dentin - cementum - and alveolar bone?
Proliferation - differentiation - morphogenesis
Pressure on the area
Connective
Osteocytes

25. When does macro/microdontia occur?
Odontogenesis
Bud stage
The dental sac
The outer enamel epithelium

26. What is the process involved in the maturation stage?
Hereditary in localized form. endocrine dysfunction is complete
Maturation
Pressure on the area
8th week

27. What are the incremental lines for enamel?
Sphere of enamel on root
Lines of Retzuis
The bud stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

28. What is the function of the Hertwig's epithelial root sheath?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Initiation stage
Apposition of the cementum

29. What are the incremental lines for dentin?
Morphogenesis
Imbrication lines of von Ebner
Dental tissues secreted as matrix in successive layers.
Cementocytes

30. What is the structure responsible for root development?
The actual vertical movement of the tooth
The cervical loop
Initiation stage
Dentin secreting cells (odontoblats)

31. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The outer enamel epithelium
Odontoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoblasts

32. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
4 types
The basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity

33. What hard tissue is can not have tissue formation after eruption?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
There are none - they are lost with eruption
The cervical loop
Enamel

34. Do odontoblasts start their secretion of matrix before the ameloblasts?
The cervical loop
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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

35. The stratum intermediate is located inner or outer?
The bud stage
Local or systemic or hereditary
Inner
The permanent molars

36. What is the embryological background for enamel?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel organ
Tall columnar cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

37. What are the clinical ramifications of concrescence?
The enamel - dentin - and cementum are secreted in successive layers
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Common with permanent maxillary molars

38. Where is the dental papilla originally derived from?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Common on permanent molars or cingulum of anterior teeth
The ectomesenchyme - which was influenced by the neural crest cells
11th to 12th weeks

39. What are entrapped cementoblasts called?
The enamel organ
Cementocytes
Odontoblasts
Enamel pearl - enamel dysplasia - and concresence

40. What happens during the bell stage?
Enamel organ
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
When the gingiva recedes and no actual tooth movement takes place

41. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Oral epithelium
Cementoid
The tooth germ

42. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
The enamel organ
Traumatic injury or crowding of teeth
Osteocytes

43. What is the main process involved in initiation?
Induction
Dental tissues secreted as matrix in successive layers.
Ameloblasts
In the cap stage

44. What are the clinical ramifications of gemination?

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45. What will the inner cells of the dental lamina differentiates into?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Union of 2 adjacent tooth germs
The primordium of the pulp
The basement membrane

46. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
9th to 10th weeks
Abnormally small teeth
Maturation

47. What kind of cells reside in the stratum intermediate?
Future dentin and pulp tissue
8th week
Compressed layer of flat to cuboidal cells
It disintegrates as the developing oral mucosa comes to line the oral cavity

48. What are the clinical ramifications?
Initiation
Dentin secreting cells (odontoblats)
Into odontoblasts
Common on permanent molars or cingulum of anterior teeth

49. What are supernumerary teeth?
Dentin and alveolar bone
4 types
Development of one or more extra teeth
Dental papilla

50. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Cementocytes
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
An extracellular substance that is partially calcified - yet serves as a framework for later calcification