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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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1. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Local or systemic or hereditary
Faulty development of enamel from interference involving ameloblasts
Inner

2. Where is the enamel matrix secreted from by the ameloblasts?

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3. What are supernumerary teeth?
Development of one or more extra teeth
Dental follicle
Tooth germ tries to divide
Cementoid

4. What is the time span for the bell stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
There are none - they are lost with eruption
The primordium of the pulp
11th to 12th weeks

5. What is the outer portion of the ectoderm in the initiation stage?
Preameloblasts
Oral epithelium
Dentin secreting cells (odontoblats)
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

6. What kind of cells occur in the outer enamel epithelium in the bell stage?
As a result of the apposition of cementum over dentin
Cementoid
Traumatic injury or crowding of teeth
Cuboidal cells

7. 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 outer enamel epithelium
The apposition of the enamel matrix
Induction

8. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Lines of Retzuis
Odontoclasts
Cementoblasts
The ameloblasts

9. When does dens in dente occur?
Cementoblasts
During the cap stage
Into odontoblasts
The outer cells of the dental papilla and the central cells of the dental papilla

10. What is the embryological background for enamel?
Preameloblasts
Enamel organ
Hereditary
Dentin and alveolar bone

11. What are the major components of the tooth germ?
The enamel - dentin - and cementum are secreted in successive layers
Enamel organ
The enamel organ - dental papilla - dental sac
Initiation stage

12. What are the etiological factors for fusion?
Pressure on the area
Hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
8th week

13. What is fusion?
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
Union of 2 adjacent tooth germs
Epithelial rests of Malassez
The ameloblasts place an acellular dental cuticle on the new enamel surface

14. The preameloblasts induce dental papilla cells to differentiate into what?
The enamel - dentin - and cementum are secreted in successive layers
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Into odontoblasts
Maturation

15. How is the reduced enamel epithelium created?
Dental tissues fully mineralize to their mature levels.
The enamel organ is compressed
Enamel organ invaginates into the dental papilla
The basement membrane

16. What are the formative cells for enamel?
Ameloblasts
Differentiation
Odontogenesis
Morphogenesis

17. What are the etiological factors of concrescence?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There is unequal growth in different parts of the tooth bud
Enamel
Traumatic injury or crowding of teeth

18. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
A mineralized cylinder - the dentinal tubule
The cementum - PDL - and alveolar bone
The apposition of the enamel matrix

19. What are the clinical ramifications of gemination?

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20. Where is the enamal organ originally derived from?
Abnormally small teeth
Epithelial
The ectoderm
The dental lamina

21. What are the etiological factors for supernumerary teeth?
Hereditary
The tooth germ
Apposition of the cementum
Lines of Retzuis

22. Tooth development
The permanent molars
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
11th to 12th weeks
Odontogenesis

23. What is gemination?
Traumatic injury or crowding of teeth
Displacement of ameloblasts to root surface
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Tooth germ tries to divide

24. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Union of 2 adjacent tooth germs
Dental follicle

25. What hard tissue has vascularity?
Sphere of enamel on root
Tooth germ
Alveolar bone
The bud stage

26. What is the predominate process of the cap stage?
Morphogenesis
Cementocytes
Cuboidal cells
Absence of single or multiple teeth

27. Which teeth are nonsuccedaneous?
9th to 10th weeks
Common with permanent maxillary molars
11th to 12th weeks
The permanent molars

28. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Union of root structure of two or more teeth by cementum
The dental sac
Abnormally large teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

29. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
The enamel organ
The outer cells of the dental papilla and the central cells of the dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

30. What are the development disturbances of the apposition and maturation stages?
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
Enamel pearl - enamel dysplasia - and concresence
Dental tissues secreted as matrix in successive layers.
6th to 7th weeks

31. How many types of cells are found in the enamel organ in the bell stage?
The basement membrane
4 types
The enamel - dentin - and cementum are secreted in successive layers
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

32. What are entrapped cementoblasts called?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Traumatic injury or crowding of teeth
Cementocytes

33. What will the inner cells of the dental lamina differentiates into?
Sphere of enamel on root
The primordium of the pulp
9th to 10th weeks
May be confused as calculus deposit on root

34. What are the mature cells for alveolar bone?
Osteocytes
Enamel
The dental lamina
9th to 10th weeks

35. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Initiation stage
6th to 7th weeks
Preameloblasts
Enamel pearl - enamel dysplasia - and concresence

36. What happens during the cap stage?
Hereditary
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.
The cervical loop
The enamel organ - dental papilla - dental sac

37. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Differentiation - proliferation - morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
As a result of the apposition of cementum over dentin

38. What is anodontia?
Morphogenesis
Absence of single or multiple teeth
Odontoblastic process
Maturation

39. What is the main process involved in the bud stage?
Enamel organ
Dental tissues fully mineralize to their mature levels.
The permanent molars
Proliferation

40. What is another name for the dental sac?
Abnormally small teeth
Dental follicle
The outer enamel epithelium
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

41. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The cementum - PDL - and alveolar bone
The ectomesenchyme
Epithelial rests of Malassez
Compressed layer of flat to cuboidal cells

42. What stage does anodontia occur?
Proliferation
Compressed layer of flat to cuboidal cells
During the cap stage
Initiation stage

43. What is tubercle?
Extra cusp due to effects on enamel organ
The cementum - PDL - and alveolar bone
Differentiation - proliferation - morphogenesis
Initiation

44. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Future dentin and pulp tissue
It disintegrates as the developing oral mucosa comes to line the oral cavity
A mineralized cylinder - the dentinal tubule
Displacement of ameloblasts to root surface

45. What stage does supernumerary teeth occur?
Initiation
The outer enamel epithelium
Epithelial
Union of root structure of two or more teeth by cementum

46. What are the etiological factors for anodontia?
Only dentinal tubules with processes
Dental tissues fully mineralize to their mature levels.
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Induction

47. What are the etiological factors of enamel dysplasia?
The enamel organ is compressed
A bilayer rim that consists only IEE and OEE
Local or systemic or hereditary
Enamel organ invaginates into the dental papilla

48. What are the clinical ramifications of fusion?
Development of one or more extra teeth
The basement membrane
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Commonly involves permanent maxillary lateral incisor and 3rd molars

49. Where is the dental papilla originally derived from?
Odontoblastic process
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The ectomesenchyme - which was influenced by the neural crest cells
Cementoblasts

50. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Differentiation - proliferation - morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Future dentin and pulp tissue