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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 etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Enamel
The actual vertical movement of the tooth
Imbrication lines of von Ebner

2. How is the dentinocemental junction formed?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The bud stage
As a result of the apposition of cementum over dentin
Odontoblasts

3. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Development of one or more extra teeth
Odontoblastic process
Dental tissues fully mineralize to their mature levels.

4. What is another name for the dental sac?
A bilayer rim that consists only IEE and OEE
Dental follicle
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Induction

5. The stratum intermediate is located inner or outer?
Inner
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Epithelial rests of Malassez
Common with permanent maxillary molars

6. What stage does supernumerary teeth occur?
Into odontoblasts
As a result of the apposition of cementum over dentin
Initiation
Trauma - pressure or metabolic disease

7. What is the time span for the bud stage?
The tooth germ
8th week
Hereditary
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

8. What are the cell layers found in the enamel organ in the bell stage?
The tooth germ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dens in dente - gemination - tubercle - and fusion
Enamel

9. What are the mature cells for enamel?
There are none - they are lost with eruption
Arrest and reversal lines
Only dentinal tubules with processes
Dental papilla

10. What are the clinical ramifications of anodontia?
Imbrication lines of von Ebner
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Proliferation - differentiation - morphogenesis
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

11. What are the clinical ramifications of supernumerary teeth?
Morphogenesis
Commonly involves permanent maxillary lateral incisor and 3rd molars
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

12. When does the process of root development take place?
As a result of the apposition of cementum over dentin
In the cap stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dental papilla

13. What is the predominate process in the bell stage?
The dental lamina
Dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Differentiation

14. What is the outer portion of the ectoderm in the initiation stage?
Abnormally small teeth
Development of one or more extra teeth
There is unequal growth in different parts of the tooth bud
Oral epithelium

15. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Initiation stage
As a result of the apposition of cementum over dentin
Preameloblasts
Differentiation - proliferation - morphogenesis

16. What will the dental sac give rise to?
The ameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
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
The cementum - PDL - and alveolar bone

17. What are the clinical ramifications of fusion?
Bud stage
Union of root structure of two or more teeth by cementum
Future dentin and pulp tissue
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

18. The oral epithelium is induced by the ectomesenchyme to produce what?
The ectoderm
The dental lamina
Dens in dente - gemination - tubercle - and fusion
The permanent molars

19. What happens during the bell stage?
Preameloblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
9th to 10th weeks
Enamel secreting cells (ameloblasts)

20. What stage does the dental tissues subsequently fully mineralize
The enamel - dentin - and cementum are secreted in successive layers
The outer cells of the dental papilla and the central cells of the dental papilla
The ameloblasts place an acellular dental cuticle on the new enamel surface
Maturation

21. What do the odontoblasts do?
Tall columnar cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
The cervical loop

22. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Abnormally small teeth
Sphere of enamel on root
Bud stage
Dental papilla

23. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Enamel pearl - enamel dysplasia - and concresence
Extra cusp due to effects on enamel organ
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementoid

24. What are the clinical ramifications of gemination?

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25. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoblasts
The permanent molars
Union of root structure of two or more teeth by cementum

26. In the cap stage the tooth bud does not grow - what happens?
Outer
There is unequal growth in different parts of the tooth bud
Commonly involves permanent maxillary lateral incisor and 3rd molars
The dental lamina

27. What is macrodontia?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Abnormally large teeth
As a result of the apposition of cementum over dentin
Differentiation

28. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Epithelial rests of Malassez
Alveolar bone
Common on permanent molars or cingulum of anterior teeth

29. What is the site for the future dentioenamel junction?
4 types
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane that seperates the enamel organ and dental papilla
Extra cusp due to effects on enamel organ

30. What processes are involved with the apposition stage?
Induction - proliferation
Traumatic injury or crowding of teeth
The cervical loop
Union of 2 adjacent tooth germs

31. Which teeth are nonsuccedaneous?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
As a result of the apposition of cementum over dentin
The permanent molars
When the gingiva recedes and no actual tooth movement takes place

32. What kind of cells reside in the stratum intermediate?
Odontogenesis
Compressed layer of flat to cuboidal cells
A mineralized cylinder - the dentinal tubule
There is unequal growth in different parts of the tooth bud

33. What is the embryological background for dentin - cementum and alveolar bone?
Union of 2 adjacent tooth germs
Dental papilla
Dentin and alveolar bone
Arrest and reversal lines

34. What is the embryological background for enamel?
Compressed layer of flat to cuboidal cells
Enamel organ
The apposition of the enamel matrix
6th to 7th weeks

35. Where is the dental papilla originally derived from?
The ameloblasts
May be confused as calculus deposit on root
Development of one or more extra teeth
The ectomesenchyme - which was influenced by the neural crest cells

36. What are entrapped cementoblasts called?
The outer cells of the dental papilla and the central cells of the dental papilla
The dental lamina
8th week
Cementocytes

37. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel organ
Union of 2 adjacent tooth germs
Odontogenesis

38. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Traumatic injury or crowding of teeth
Extra cusp due to effects on enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface

39. The preameloblasts induce dental papilla cells to differentiate into what?
Dentin and alveolar bone
The cementum - PDL - and alveolar bone
Into odontoblasts
Cuboidal cells

40. What are the etiological factors of concrescence?
May be confused as calculus deposit on root
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dental tissues secreted as matrix in successive layers.
Traumatic injury or crowding of teeth

41. What kind of cells occur in the inner enamel epithelium?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Tall columnar cells
Displacement of ameloblasts to root surface
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

42. How is the reduced enamel epithelium created?
A bilayer rim that consists only IEE and OEE
The basement membrane
The enamel organ is compressed
Proliferation

43. What is the time span for the cap stage?
The primordium of the pulp
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The apposition of the enamel matrix
9th to 10th weeks

44. What hard tissue is innervated by nerves?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dentin and alveolar bone
The enamel organ - dental papilla - dental sac
Cementocytes

45. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Trauma - pressure or metabolic disease
Cementoblasts
Maturation

46. What does the cervical loop consist of?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ is compressed
A bilayer rim that consists only IEE and OEE
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

47. What hard tissue is can not have tissue formation after eruption?
Enamel
Cementoblasts
Proliferation - differentiation - morphogenesis
Compressed layer of flat to cuboidal cells

48. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Cementoblasts
Sphere of enamel on root
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

49. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontoblasts
The tooth germ
Outer

50. What are the clinical ramifications of enamel pearl?
Future dentin and pulp tissue
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary in localized form. endocrine dysfunction is complete
May be confused as calculus deposit on root