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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 clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Traumatic injury or crowding of teeth
11th to 12th weeks
The apposition of the enamel matrix

2. What else undergoes proliferation in the bud stage besides the dental lamina?
Cementocytes
The ectomesenchyme
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
Union of root structure of two or more teeth by cementum

3. What happens during the cap stage?
In the cap stage
Inner
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.

4. When does dens in dente occur?
There is unequal growth in different parts of the tooth bud
Connective
The tooth germ
During the cap stage

5. What is the predominate process in the bell stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Differentiation
Dental follicle

6. 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
The stellate reticulum
Only dentinal tubules with processes
The enamel organ is compressed

7. What is tubercle?
Odontoclasts
Extra cusp due to effects on enamel organ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectoderm

8. Where is the dental sac originally derived from?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Future dentin and pulp tissue
Outer
The ectomesenchyme

9. Which layer in the bell stage has star shaped cells?
The enamel organ is compressed
Traumatic injury or crowding of teeth
The stellate reticulum
Enamel

10. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The primordium of the pulp
Cementoblasts
Oral epithelium
Enamel organ invaginates into the dental papilla

11. How is the dentinocemental junction formed?
Outer
As a result of the apposition of cementum over dentin
The dental sac
Differentiation

12. What are the clinical ramifications of enamel pearl?
Faulty development of enamel from interference involving ameloblasts
Osteocytes
Morphogenesis
May be confused as calculus deposit on root

13. What type of tissue is enamel?
Epithelial
Displacement of ameloblasts to root surface
Dental tissues fully mineralize to their mature levels.
Commonly involves permanent maxillary lateral incisor and 3rd molars

14. What are entrapped cementoblasts called?
Cementocytes
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The ectomesenchyme
Initiation stage

15. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Hereditary
Dental tissues secreted as matrix in successive layers.
Local or systemic or hereditary

16. What is the embryological background for enamel?
Enamel organ
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 basement membrane that seperates the enamel organ and dental papilla
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

17. Do odontoblasts start their secretion of matrix before the ameloblasts?
The ameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
May be confused as calculus deposit on root
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

18. What do the odontoblasts do?
In the cap stage
Local or systemic or hereditary
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

19. What hard tissue has vascularity?
Dental papilla
The ectoderm
Alveolar bone
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

20. Passive eruption
The basement membrane
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
When the gingiva recedes and no actual tooth movement takes place
Trauma - pressure or metabolic disease

21. What are the clinical ramifications of concrescence?
Maturation
Cementocytes
Dental papilla
Common with permanent maxillary molars

22. What is anodontia?
Enamel secreting cells (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
Union of root structure of two or more teeth by cementum
Absence of single or multiple teeth

23. What will the inner cells of the dental lamina differentiates into?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The primordium of the pulp
Traumatic injury or crowding of teeth
The bud stage

24. What is the cap in the cap stage?
Oral epithelium
8th week
The enamel organ
Into odontoblasts

25. What stage does anodontia occur?
The tooth germ
Initiation stage
During the cap stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

26. What happens during the apposition stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Pressure on the area
Dental tissues secreted as matrix in successive layers.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

27. What are the formative cells for alveolar bone?
Common on permanent molars or cingulum of anterior teeth
Cementoid
Osteoblasts
Epithelial

28. What are the etiological factors for anodontia?
Enamel organ invaginates into the dental papilla
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There are none - they are lost with eruption

29. What is the time span for initiation?
Enamel secreting cells (ameloblasts)
6th to 7th weeks
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Morphogenesis

30. 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 dental lamina
The stellate reticulum
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

31. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Traumatic injury or crowding of teeth
Enamel secreting cells (ameloblasts)
Displacement of ameloblasts to root surface

32. What hard tissue is can not have tissue formation after eruption?
Maturation
Enamel
During the cap stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

33. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
There are none - they are lost with eruption
Maturation
Alveolar bone

34. What are the etiological factors for supernumerary teeth?
During the cap stage
Hereditary
Arrest and reversal lines
Imbrication lines of von Ebner

35. What is the embryological background for dentin - cementum and alveolar bone?
The ectomesenchyme
Dental papilla
Only dentinal tubules with processes
The permanent molars

36. What are the clinical ramifications of enamel dysplasia?
Displacement of ameloblasts to root surface
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel secreting cells (ameloblasts)

37. What is microdontia?
Pressure on the area
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Extra cusp due to effects on enamel organ
Abnormally small teeth

38. What are the mature cells for cementum?
The outer enamel epithelium
Development of one or more extra teeth
Maturation
Cementocytes

39. What is enamel dysplasia?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
As a result of the apposition of cementum over dentin
Faulty development of enamel from interference involving ameloblasts
The dental sac

40. What wll the inner enamel epithelium differentiate into?
Enamel
Enamel secreting cells (ameloblasts)
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Connective

41. What happens when the reduced enamel epithelium is created?
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
Absence of single or multiple teeth
When the gingiva recedes and no actual tooth movement takes place
The bud stage

42. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The actual vertical movement of the tooth
Hereditary
The dental sac
Connective

43. What are the etiological factors for fusion?
Dental papilla
Osteocytes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Pressure on the area

44. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Cementocytes
Hereditary
The bud stage
Epithelial

45. What is another name for the dental sac?
Traumatic injury or crowding of teeth
Future dentin and pulp tissue
Compressed layer of flat to cuboidal cells
Dental follicle

46. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Displacement of ameloblasts to root surface
The permanent molars
Bud stage

47. What processes are involved with the apposition stage?
Induction - proliferation
Enamel pearl - enamel dysplasia - and concresence
Epithelial
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

48. What are the etiological factors for enamel pearl?
Extra cusp due to effects on enamel organ
Displacement of ameloblasts to root surface
Sphere of enamel on root
As a result of the apposition of cementum over dentin

49. The stellate reticulum is located inner or outer?
Outer
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cuboidal cells
Dentin and alveolar bone

50. What is the main process involved in initiation?
Induction
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Outer
11th to 12th weeks