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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 hard tissue has vascularity?
The bud stage
Alveolar bone
The cementum - PDL - and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

2. What are the etiological factors of enamel dysplasia?
During the cap stage
Imbrication lines of von Ebner
Local or systemic or hereditary
Only dentinal tubules with processes

3. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
As a result of the apposition of cementum over dentin
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementocytes

4. What stage does the dental tissues subsequently fully mineralize
Maturation
Proliferation
Union of root structure of two or more teeth by cementum
May be confused as calculus deposit on root

5. What is macrodontia?
8th week
Abnormally large teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
It disintegrates as the developing oral mucosa comes to line the oral cavity

6. What are the clinical ramifications of micro/macrodontia?
The basement membrane
Union of 2 adjacent tooth germs
The enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars

7. The preameloblasts induce dental papilla cells to differentiate into what?
11th to 12th weeks
The tooth germ
Inner
Into odontoblasts

8. The stellate reticulum is located inner or outer?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Enamel pearl - enamel dysplasia - and concresence
Ameloblasts
Outer

9. What are the clinical ramifications of anodontia?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The basement membrane
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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

10. When does the process of root development take place?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectomesenchyme
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Commonly involves permanent maxillary lateral incisor and 3rd molars

11. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
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
Hereditary
The outer cells of the dental papilla and the central cells of the dental papilla

12. When does dens in dente occur?
The outer cells of the dental papilla and the central cells of the dental papilla
During the cap stage
Common on permanent molars or cingulum of anterior teeth
The stellate reticulum

13. What is matrix?
When the gingiva recedes and no actual tooth movement takes place
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Lines of Retzuis

14. What are the etiological factors of concrescence?
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
Traumatic injury or crowding of teeth
The actual vertical movement of the tooth
Cuboidal cells

15. What happens during the apposition stage?
Proliferation - differentiation - morphogenesis
Dentin and alveolar bone
Dental tissues secreted as matrix in successive layers.
Common on permanent molars or cingulum of anterior teeth

16. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Dental tissues secreted as matrix in successive layers.
Extra cusp due to effects on enamel organ
Preameloblasts
Cementoid

17. What is gemination?
Trauma - pressure or metabolic disease
The tooth germ
Tooth germ tries to divide
The bud stage

18. What happens during the bud stage?
Future dentin and pulp tissue
Common with permanent maxillary molars
Dental tissues secreted as matrix in successive layers.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

19. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Development of one or more extra teeth
Tall columnar cells
Ameloblasts
The dental sac

20. What are the etiological factors for dens in dente and gemination?
Dens in dente - gemination - tubercle - and fusion
The permanent molars
The dental lamina
Hereditary

21. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Tall columnar cells
The stellate reticulum
Enamel secreting cells (ameloblasts)

22. What are the development disturbances of the apposition and maturation stages?
The primordium of the pulp
Enamel pearl - enamel dysplasia - and concresence
Maturation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

23. What is tubercle?
The apposition of the enamel matrix
Pressure on the area
Extra cusp due to effects on enamel organ
Common with permanent maxillary molars

24. Where does the primordium of the permanent dentition develop?
Odontoblastic process
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
As a result of the apposition of cementum over dentin
8th week

25. What is microdontia?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The outer cells of the dental papilla and the central cells of the dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Abnormally small teeth

26. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Bud stage
Outer

27. What is amelogenisis?
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 apposition of the enamel matrix
11th to 12th weeks
The tooth germ

28. What hard tissue is can not have tissue formation after eruption?
May be confused as calculus deposit on root
8th week
Alveolar bone
Enamel

29. What are the etiological factors for supernumerary teeth?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The enamel organ is compressed
Inner
Hereditary

30. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Preameloblasts
May be confused as calculus deposit on root
Outer

31. What are the incremental lines for cementum and alveolar bone?
The apposition of the enamel matrix
Arrest and reversal lines
When the gingiva recedes and no actual tooth movement takes place
The ectomesenchyme

32. What will the dental sac give rise to?
Dentin and alveolar bone
The cementum - PDL - and alveolar bone
Common with permanent maxillary molars
The ectomesenchyme

33. What is the site for the future dentioenamel junction?
Arrest and reversal lines
The basement membrane that seperates the enamel organ and dental papilla
Odontogenesis
Cementoblasts

34. What else undergoes proliferation in the bud stage besides the dental lamina?
The outer cells of the dental papilla and the central cells of the dental papilla
Dental papilla
Initiation stage
The ectomesenchyme

35. In the cap stage the tooth bud does not grow - what happens?
Dental papilla
There is unequal growth in different parts of the tooth bud
Dental tissues secreted as matrix in successive layers.
Compressed layer of flat to cuboidal cells

36. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Inner
Union of 2 adjacent tooth germs
Outer

37. What is dens in dente?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary
Sphere of enamel on root
Enamel organ invaginates into the dental papilla

38. What is the process involved in the maturation stage?
As a result of the apposition of cementum over dentin
Dental tissues secreted as matrix in successive layers.
The apposition of the enamel matrix
Maturation

39. How many types of cells are found in the enamel organ in the bell stage?
Dental follicle
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The stellate reticulum
4 types

40. Where is the dental sac originally derived from?
The ectomesenchyme
Cementoid
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Arrest and reversal lines

41. 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
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Outer
Traumatic injury or crowding of teeth

42. Do odontoblasts start their secretion of matrix before the ameloblasts?
Enamel pearl - enamel dysplasia - and concresence
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Commonly involves permanent maxillary lateral incisor and 3rd molars
Common with permanent maxillary molars

43. What are the major components of the tooth germ?
During the cap stage
Cementocytes
The enamel organ - dental papilla - dental sac
Into odontoblasts

44. What are the mature cells for dentin?
The enamel organ is compressed
Only dentinal tubules with processes
Enamel organ
The dental sac

45. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Differentiation - proliferation - morphogenesis
The ameloblasts
The basement membrane
Dentin and alveolar bone

46. What are the formative cells for cementum?
Cementoblasts
Enamel organ
Imbrication lines of von Ebner
Osteoblasts

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
Alveolar bone
Only dentinal tubules with processes
The ectomesenchyme - which was influenced by the neural crest cells

48. What are the clinical ramifications of enamel dysplasia?
Dental follicle
Osteoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
In the cap stage

49. What is anodontia?
Into odontoblasts
Dental tissues fully mineralize to their mature levels.
The enamel organ - dental papilla - dental sac
Absence of single or multiple teeth

50. What stage does anodontia occur?
Sphere of enamel on root
Epithelial rests of Malassez
Initiation stage
Development of one or more extra teeth