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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. Active eruption
Epithelial
Maturation
Epithelial rests of Malassez
The actual vertical movement of the tooth

2. What are the clinical ramifications of enamel dysplasia?
Enamel organ invaginates into the dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectoderm
The outer enamel epithelium

3. How is the dentinocemental junction formed?
The ameloblasts
As a result of the apposition of cementum over dentin
Initiation
The tooth germ

4. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The enamel - dentin - and cementum are secreted in successive layers
Future dentin and pulp tissue
Compressed layer of flat to cuboidal cells
The basement membrane

5. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Tooth germ
Dental papilla
Initiation stage

6. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
The enamel organ is compressed
Displacement of ameloblasts to root surface
6th to 7th weeks

7. What stage does anodontia occur?
Enamel organ invaginates into the dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Initiation stage

8. What is the cap in the cap stage?
Connective
Tooth germ
As a result of the apposition of cementum over dentin
The enamel organ

9. What happens during the bell stage?
Cementocytes
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Morphogenesis
The ectomesenchyme

10. What is the time span for the bud stage?
8th week
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
Enamel organ
Hereditary

11. What are supernumerary teeth?
Development of one or more extra teeth
Absence of single or multiple teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Lines of Retzuis

12. The stratum intermediate is located inner or outer?
Inner
Enamel
Induction
Outer

13. What is the main process involved in initiation?
Induction
Inner
The primordium of the pulp
Hereditary

14. What are the mature cells for dentin?
Dental papilla
9th to 10th weeks
Only dentinal tubules with processes
Displacement of ameloblasts to root surface

15. When does dens in dente occur?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
During the cap stage
Dental tissues fully mineralize to their mature levels.
Enamel pearl - enamel dysplasia - and concresence

16. What causes the induction of the preameloblasts to differentiate into ameloblasts?
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 disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cementocytes
The cementum - PDL - and alveolar bone

17. What is the time span for the bell stage?
11th to 12th weeks
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Hereditary
Bud stage

18. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Displacement of ameloblasts to root surface
4 types
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontoclasts

19. What happens during the apposition stage?
Enamel pearl - enamel dysplasia - and concresence
Dentin secreting cells (odontoblats)
Dental tissues secreted as matrix in successive layers.
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

20. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The basement membrane
The ectomesenchyme
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

21. Where does the primordium of the permanent dentition develop?
The enamel organ - dental papilla - dental sac
Epithelial rests of Malassez
Maturation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

22. What are the major components of the tooth germ?
Union of root structure of two or more teeth by cementum
As a result of the apposition of cementum over dentin
The enamel organ - dental papilla - dental sac
The apposition of the enamel matrix

23. What are the formative cells for alveolar bone?
Dental tissues fully mineralize to their mature levels.
Common with permanent maxillary molars
Osteoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

24. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
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 cervical loop
Arrest and reversal lines
The ameloblasts place an acellular dental cuticle on the new enamel surface

25. What is the main process involved in the bud stage?
Union of 2 adjacent tooth germs
9th to 10th weeks
Preameloblasts
Proliferation

26. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Proliferation - differentiation - morphogenesis
Oral epithelium
The cementum - PDL - and alveolar bone

27. 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
Induction - proliferation
Trauma - pressure or metabolic disease

28. What is the predominate process of the cap stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Ameloblasts
Morphogenesis
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.

29. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
Outer
Initiation
The outer cells of the dental papilla and the central cells of the dental papilla

30. What are the formative cells for cementum?
Cementoblasts
Odontoclasts
Cementocytes
Odontoblastic process

31. What are the mature cells for alveolar bone?
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.
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The cervical loop
Osteocytes

32. Where is the dental papilla originally derived from?
Dental papilla
The ectomesenchyme - which was influenced by the neural crest cells
Alveolar bone
Local or systemic or hereditary

33. What are succedaneous teeth?
Lines of Retzuis
Epithelial
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Odontoclasts

34. What are the incremental lines for enamel?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Lines of Retzuis
Traumatic injury or crowding of teeth
The enamel organ is compressed

35. What are the clinical ramifications of enamel pearl?
Tooth germ tries to divide
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
May be confused as calculus deposit on root
Morphogenesis

36. What is tubercle?
The dental sac
Cementoblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Extra cusp due to effects on enamel organ

37. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
When the gingiva recedes and no actual tooth movement takes place
The basement membrane that seperates the enamel organ and dental papilla
Cementocytes

38. What will the dental sac give rise to?
Traumatic injury or crowding of teeth
The cementum - PDL - and alveolar bone
Ameloblasts
The ectomesenchyme

39. What is the process involved in the maturation stage?
The ectomesenchyme
A mineralized cylinder - the dentinal tubule
Maturation
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.

40. How many types of cells are found in the enamel organ in the bell stage?
4 types
Maturation
Into odontoblasts
The dental sac

41. What is the structure responsible for root development?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Trauma - pressure or metabolic disease
Cuboidal cells
The cervical loop

42. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Development of one or more extra teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
9th to 10th weeks
The ameloblasts

43. What are the developmental disturbances of the cap stage?
The cementum - PDL - and alveolar bone
Sphere of enamel on root
Future dentin and pulp tissue
Dens in dente - gemination - tubercle - and fusion

44. Where is the dental sac originally derived from?
The ectomesenchyme
Enamel
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The enamel organ - dental papilla - dental sac

45. What is the predominate process in the bell stage?
When the gingiva recedes and no actual tooth movement takes place
Odontoblastic process
The outer cells of the dental papilla and the central cells of the dental papilla
Differentiation

46. What layer serves as protection for the enamel organ?
Dental follicle
Odontoclasts
The outer enamel epithelium
The dental lamina

47. What is the cementum matrix called?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementoid
During the cap stage
The outer cells of the dental papilla and the central cells of the dental papilla

48. What are the etiological factors of enamel dysplasia?
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 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
Cementoblasts
Local or systemic or hereditary

49. What is gemination?
Absence of single or multiple teeth
11th to 12th weeks
Tooth germ tries to divide
The cementum - PDL - and alveolar bone

50. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Lines of Retzuis
Sphere of enamel on root
The dental lamina