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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 are the clinical ramifications of fusion?
Differentiation - proliferation - morphogenesis
Union of root structure of two or more teeth by cementum
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

2. What kind of cells occur in the outer enamel epithelium in the bell stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Union of root structure of two or more teeth by cementum
Preameloblasts
Cuboidal cells

3. What is concrescence?
Cementocytes
The tooth germ
Morphogenesis
Union of root structure of two or more teeth by cementum

4. In the cap stage the tooth bud does not grow - what happens?
In the cap stage
There is unequal growth in different parts of the tooth bud
Cuboidal cells
As a result of the apposition of cementum over dentin

5. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Compressed layer of flat to cuboidal cells
Dental papilla
Enamel secreting cells (ameloblasts)

6. 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
9th to 10th weeks
Cementoblasts
Dental follicle

7. What type of tissue is dentin - cementum - and alveolar bone?
Lines of Retzuis
Hereditary in localized form. endocrine dysfunction is complete
Connective
Cuboidal cells

8. What are the formative cells for alveolar bone?
Osteoblasts
When the gingiva recedes and no actual tooth movement takes place
Abnormally large teeth
The ectomesenchyme - which was influenced by the neural crest cells

9. What is the cementum matrix called?
Cementoid
The basement membrane that seperates the enamel organ and dental papilla
The ameloblasts
Sphere of enamel on root

10. What is the embryological background for enamel?
Enamel organ invaginates into the dental papilla
Preameloblasts
The primordium of the pulp
Enamel organ

11. What is an enamel pearl?
When the gingiva recedes and no actual tooth movement takes place
Sphere of enamel on root
The outer enamel epithelium
Abnormally small teeth

12. Passive eruption
Displacement of ameloblasts to root surface
When the gingiva recedes and no actual tooth movement takes place
Into odontoblasts
Hereditary

13. What is matrix?
The outer cells of the dental papilla and the central cells of the dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Oral epithelium
The ameloblasts place an acellular dental cuticle on the new enamel surface

14. What are supernumerary teeth?
Tooth germ tries to divide
The ectoderm
Development of one or more extra teeth
Odontogenesis

15. What are the clinical ramifications of concrescence?
Induction - proliferation
Common with permanent maxillary molars
Epithelial
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

16. What is dens in dente?
Osteoblasts
The apposition of the enamel matrix
Enamel organ invaginates into the dental papilla
Dentin and alveolar bone

17. What hard tissue has vascularity?
The primordium of the pulp
Alveolar bone
Into odontoblasts
The stellate reticulum

18. What are the developmental disturbances of the cap stage?
Odontoblastic process
Dens in dente - gemination - tubercle - and fusion
Dentin and alveolar bone
The ameloblasts place an acellular dental cuticle on the new enamel surface

19. What is cementogenisis?
Traumatic injury or crowding of teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Apposition of the cementum
Enamel

20. What are the formative cells for cementum?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Cementoblasts
Connective
Dentin secreting cells (odontoblats)

21. What are succedaneous teeth?
The cervical loop
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Traumatic injury or crowding of teeth
Maturation

22. What are the clinical ramifications of gemination?

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23. What is the predominate process in the bell stage?
Enamel
Differentiation
Imbrication lines of von Ebner
The ectomesenchyme - which was influenced by the neural crest cells

24. When does dens in dente occur?
Tooth germ tries to divide
During the cap stage
The enamel organ - dental papilla - dental sac
Enamel pearl - enamel dysplasia - and concresence

25. What type of tissue is enamel?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Union of 2 adjacent tooth germs
Epithelial
Odontoblasts

26. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Cementoblasts
The dental sac
The permanent molars
Outer

27. What are the etiological factors for supernumerary teeth?
Hereditary
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementoid
Enamel secreting cells (ameloblasts)

28. What is amelogenisis?
The dental sac
The ectomesenchyme - which was influenced by the neural crest cells
Dens in dente - gemination - tubercle - and fusion
The apposition of the enamel matrix

29. What are the etiological factors for fusion?
Only dentinal tubules with processes
Pressure on the area
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Cementoblasts

30. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Induction
Outer
Osteoblasts
Epithelial rests of Malassez

31. What is the time span for the cap stage?
9th to 10th weeks
Cementoblasts
Dental tissues fully mineralize to their mature levels.
Arrest and reversal lines

32. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Cementocytes
The basement membrane
The apposition of the enamel matrix
Arrest and reversal lines

33. What are the clinical ramifications?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Common on permanent molars or cingulum of anterior teeth
As a result of the apposition of cementum over dentin
Union of root structure of two or more teeth by cementum

34. What are the mature cells for enamel?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The cementum - PDL - and alveolar bone
During the cap stage
There are none - they are lost with eruption

35. Active eruption
The ameloblasts
The actual vertical movement of the tooth
The ameloblasts place an acellular dental cuticle on the new enamel surface
Tooth germ

36. What are the incremental lines for cementum and alveolar bone?
Induction
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Arrest and reversal lines
Cementocytes

37. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Hereditary
The basement membrane
Pressure on the area
The enamel organ - dental papilla - dental sac

38. What is the process involved in the maturation stage?
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
Maturation
Hereditary

39. Where does the primordium of the permanent dentition develop?
The outer enamel epithelium
The stellate reticulum
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Pressure on the area

40. What processes are involved with the apposition stage?
Induction - proliferation
Enamel organ
Apposition of the cementum
Abnormally small teeth

41. What is the time span for initiation?
Extra cusp due to effects on enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
6th to 7th weeks

42. Do odontoblasts start their secretion of matrix before the ameloblasts?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Local or systemic or hereditary
Dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

43. When does the process of root development take place?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The basement membrane
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The tooth germ

44. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
9th to 10th weeks
Odontoblasts
Compressed layer of flat to cuboidal cells
The bud stage

45. What is the structure responsible for root development?
The cervical loop
Maturation
Trauma - pressure or metabolic disease
The ectomesenchyme

46. Where is the dental sac originally derived from?
The ectomesenchyme
Enamel pearl - enamel dysplasia - and concresence
Hereditary
The dental sac

47. What are the clinical ramifications of dens in dente?
A bilayer rim that consists only IEE and OEE
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Ameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

48. How is the reduced enamel epithelium created?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The enamel organ - dental papilla - dental sac
The enamel organ is compressed
Hereditary

49. What is gemination?
Tooth germ tries to divide
Dental follicle
The cervical loop
The basement membrane

50. What is the predominate process of the cap stage?
Morphogenesis
Trauma - pressure or metabolic disease
The dental sac
The stellate reticulum