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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. Where is the dental sac originally derived from?
Enamel organ
The ectomesenchyme
The basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

2. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Maturation
Cementocytes
The ectoderm

3. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Development of one or more extra teeth
Trauma - pressure or metabolic disease
The dental sac

4. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The stellate reticulum
Dental papilla
Common on permanent molars or cingulum of anterior teeth

5. What is dens in dente?
Enamel organ invaginates into the dental papilla
Enamel pearl - enamel dysplasia - and concresence
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
Trauma - pressure or metabolic disease

6. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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.
Proliferation
Pressure on the area

7. When does the tooth bud become a tooth germ?
The apposition of the enamel matrix
In the cap stage
4 types
The basement membrane that seperates the enamel organ and dental papilla

8. What hard tissue is can not have tissue formation after eruption?
Arrest and reversal lines
Enamel
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.
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

9. What are the developmental disturbances of the cap stage?
Cementoid
Dens in dente - gemination - tubercle - and fusion
Morphogenesis
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

10. Which teeth are nonsuccedaneous?
Imbrication lines of von Ebner
The permanent molars
Odontoblastic process
Commonly involves permanent maxillary lateral incisor and 3rd molars

11. What is the structure responsible for root development?
The ectoderm
Dens in dente - gemination - tubercle - and fusion
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The cervical loop

12. What else undergoes proliferation in the bud stage besides the dental lamina?
6th to 7th weeks
The cervical loop
The ectomesenchyme
During the cap stage

13. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
11th to 12th weeks
The cervical loop
Dentin secreting cells (odontoblats)

14. Active eruption
The actual vertical movement of the tooth
Local or systemic or hereditary
Dental tissues secreted as matrix in successive layers.
The outer enamel epithelium

15. What type of tissue is dentin - cementum - and alveolar bone?
Sphere of enamel on root
The outer enamel epithelium
Connective
Dental papilla

16. What processes are involved with the apposition stage?
Dens in dente - gemination - tubercle - and fusion
Induction - proliferation
The enamel organ is compressed
Connective

17. What are the formative cells for alveolar bone?
Tooth germ
Osteoblasts
As a result of the apposition of cementum over dentin
Oral epithelium

18. What stage does the dental tissues subsequently fully mineralize
Maturation
Commonly involves permanent maxillary lateral incisor and 3rd molars
Odontoblasts
The outer enamel epithelium

19. What are the mature cells for alveolar bone?
The cementum - PDL - and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Initiation stage
Osteocytes

20. What hard tissue has vascularity?
Dental follicle
Alveolar bone
The enamel - dentin - and cementum are secreted in successive layers
Development of one or more extra teeth

21. What are the formative cells for dentin?
The apposition of the enamel matrix
Odontoblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

22. What is the predominate process in the bell stage?
As a result of the apposition of cementum over dentin
Differentiation
Traumatic injury or crowding of teeth
Cementocytes

23. What is macrodontia?
Abnormally large teeth
The cervical loop
Only dentinal tubules with processes
Union of root structure of two or more teeth by cementum

24. What is the time span for initiation?
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
6th to 7th weeks
In the cap stage
The cervical loop

25. What are the major components of the tooth germ?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The stellate reticulum
The enamel organ - dental papilla - dental sac
The cervical loop

26. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Hereditary in localized form. endocrine dysfunction is complete
Epithelial rests of Malassez
8th week
Displacement of ameloblasts to root surface

27. 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
There is unequal growth in different parts of the tooth bud
Into odontoblasts
Dentin secreting cells (odontoblats)

28. What are the etiological factors for micro/macrodontia?
Morphogenesis
Odontoblastic process
9th to 10th weeks
Hereditary in localized form. endocrine dysfunction is complete

29. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Pressure on the area
The actual vertical movement of the tooth
The apposition of the enamel matrix

30. What is cementogenisis?
The enamel organ is compressed
Initiation
Cementoblasts
Apposition of the cementum

31. What are the clinical ramifications of micro/macrodontia?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ameloblasts place an acellular dental cuticle on the new enamel surface
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dens in dente - gemination - tubercle - and fusion

32. What are the mature cells for enamel?
There are none - they are lost with eruption
Bud stage
Union of root structure of two or more teeth by cementum
Future dentin and pulp tissue

33. What is the function of the Hertwig's epithelial root sheath?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tall columnar cells
Faulty development of enamel from interference involving ameloblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

34. What are supernumerary teeth?
Enamel organ
Morphogenesis
Development of one or more extra teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface

35. What is the main process involved in initiation?
Preameloblasts
Induction
Imbrication lines of von Ebner
The apposition of the enamel matrix

36. What will the inner cells of the dental lamina differentiates into?
Differentiation - proliferation - morphogenesis
Tooth germ tries to divide
Induction - proliferation
The primordium of the pulp

37. What is the time span for the bud stage?
8th week
Cementoblasts
Connective
The apposition of the enamel matrix

38. What is the primordium of the tooth?
The tooth germ
11th to 12th weeks
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Alveolar bone

39. What is tubercle?
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
In the cap stage
Enamel organ invaginates into the dental papilla

40. What are the clinical ramifications of dens in dente?
Cementoid
Proliferation
Traumatic injury or crowding of teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

41. What is amelogenisis?
Odontogenesis
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoclasts
The apposition of the enamel matrix

42. What are the formative cells for enamel?
Ameloblasts
Dentin secreting cells (odontoblats)
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
May be confused as calculus deposit on root

43. What wll the inner enamel epithelium differentiate into?
Extra cusp due to effects on enamel organ
Enamel secreting cells (ameloblasts)
A mineralized cylinder - the dentinal tubule
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

44. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
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
The apposition of the enamel matrix

45. Do odontoblasts start their secretion of matrix before the ameloblasts?
Ameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
It disintegrates as the developing oral mucosa comes to line the oral cavity

46. What is gemination?
Tooth germ tries to divide
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectomesenchyme
The tooth germ

47. What is the site for the future dentioenamel junction?
Dental tissues fully mineralize to their mature levels.
Displacement of ameloblasts to root surface
The basement membrane that seperates the enamel organ and dental papilla
Cementocytes

48. What happens when the reduced enamel epithelium is created?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The dental lamina
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
When the gingiva recedes and no actual tooth movement takes place

49. What layer serves as protection for the enamel organ?
Only dentinal tubules with processes
Ameloblasts
The outer enamel epithelium
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

50. What happens during initiation?
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
6th to 7th weeks
Dental tissues secreted as matrix in successive layers.
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