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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 is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Local or systemic or hereditary
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tall columnar cells

2. What kind of cells occur in the outer enamel epithelium in the bell stage?
Sphere of enamel on root
Dental papilla
Cuboidal cells
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

3. What do the odontoblasts do?
The stellate reticulum
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel organ
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

4. What are the incremental lines for enamel?
Union of root structure of two or more teeth by cementum
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel secreting cells (ameloblasts)
Lines of Retzuis

5. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Into odontoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The bud stage
The basement membrane

6. What are the clinical ramifications of enamel pearl?
8th week
May be confused as calculus deposit on root
Dental tissues fully mineralize to their mature levels.
During the cap stage

7. What are entrapped cementoblasts called?
Cementocytes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
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
Maturation

8. What are the etiological factors of concrescence?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Traumatic injury or crowding of teeth
Preameloblasts
Common on permanent molars or cingulum of anterior teeth

9. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The apposition of the enamel matrix
Induction
Extra cusp due to effects on enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

10. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Tooth germ tries to divide
The enamel - dentin - and cementum are secreted in successive layers
Compressed layer of flat to cuboidal cells

11. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
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
Ameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Extra cusp due to effects on enamel organ

12. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
There are none - they are lost with eruption
The cementum - PDL - and alveolar bone

13. What are the clinical ramifications of supernumerary teeth?
Cementoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Abnormally large 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

14. Active eruption
The dental lamina
Local or systemic or hereditary
The cervical loop
The actual vertical movement of the tooth

15. What is gemination?
Enamel organ
Tooth germ tries to divide
In the cap stage
Commonly involves permanent maxillary lateral incisor and 3rd molars

16. What hard tissue has vascularity?
Hereditary
Alveolar bone
Compressed layer of flat to cuboidal cells
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

17. What is concrescence?
Union of root structure of two or more teeth by cementum
Inner
As a result of the apposition of cementum over dentin
Common with permanent maxillary molars

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

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19. How many types of cells are found in the enamel organ in the bell stage?
Common with permanent maxillary molars
4 types
The permanent molars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

20. When does macro/microdontia occur?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Bud stage
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 successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

21. What is the function of the Hertwig's epithelial root sheath?
Hereditary
The ectomesenchyme - which was influenced by the neural crest cells
Maturation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

22. What are the processes involved in the cap stage?
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
During the cap stage
Proliferation - differentiation - morphogenesis
Maturation

23. What processes are involved with the apposition stage?
Enamel pearl - enamel dysplasia - and concresence
Induction - proliferation
Differentiation
The ectomesenchyme - which was influenced by the neural crest cells

24. What are the etiological factors of enamel dysplasia?
Tooth germ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Local or systemic or hereditary
The enamel organ is compressed

25. What are the formative cells for alveolar bone?
Future dentin and pulp tissue
Osteoblasts
Enamel pearl - enamel dysplasia - and concresence
Dental tissues fully mineralize to their mature levels.

26. What is the structure responsible for root development?
The cervical loop
Faulty development of enamel from interference involving ameloblasts
The enamel organ - dental papilla - dental sac
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

27. Do odontoblasts start their secretion of matrix before the ameloblasts?
Cementoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Odontoclasts
Outer

28. What is the predominate process of the cap stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Morphogenesis

29. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Into odontoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cuboidal cells

30. What is anodontia?
Hereditary
Enamel pearl - enamel dysplasia - and concresence
Enamel
Absence of single or multiple teeth

31. What is tubercle?
Hereditary in localized form. endocrine dysfunction is complete
The ameloblasts
Extra cusp due to effects on enamel organ
Imbrication lines of von Ebner

32. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
The actual vertical movement of the tooth
Induction
Union of 2 adjacent tooth germs

33. What are the etiological factors for enamel pearl?
The enamel organ
Displacement of ameloblasts to root surface
9th to 10th weeks
Preameloblasts

34. What is the outer portion of the ectoderm in the initiation stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Oral epithelium
Absence of single or multiple teeth

35. What are the mature cells for dentin?
Only dentinal tubules with processes
Imbrication lines of von Ebner
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

36. What is the embryological background for enamel?
Osteoblasts
4 types
It disintegrates as the developing oral mucosa comes to line the oral cavity
Enamel organ

37. What is the main process involved in initiation?
Induction
The primordium of the pulp
Traumatic injury or crowding of teeth
8th week

38. What is the cap in the cap stage?
Pressure on the area
The enamel organ is compressed
The enamel organ
A mineralized cylinder - the dentinal tubule

39. What stage does the dental tissues subsequently fully mineralize
Enamel pearl - enamel dysplasia - and concresence
Enamel secreting cells (ameloblasts)
Common on permanent molars or cingulum of anterior teeth
Maturation

40. What is the main process involved in the bud stage?
Abnormally large teeth
Proliferation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The basement membrane

41. What is the embryological background for dentin - cementum and alveolar bone?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dental follicle
8th week
Dental papilla

42. Which layer in the bell stage has star shaped cells?
The primordium of the pulp
The stellate reticulum
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental papilla

43. What are the clinical ramifications of gemination?

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44. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
The enamel organ - dental papilla - dental sac
The apposition of the enamel matrix
Hereditary

45. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Morphogenesis
The apposition of the enamel matrix
Common with permanent maxillary molars

46. What will the outer cells of the dental lamina differentiate into?
Sphere of enamel on root
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dentin secreting cells (odontoblats)
The ectomesenchyme

47. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
May be confused as calculus deposit on root
Induction - proliferation

48. What are succedaneous teeth?
The ameloblasts
Bud stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Commonly involves permanent maxillary lateral incisor and 3rd molars

49. What happens during the maturation stage?
Tooth germ tries to divide
Dental tissues fully mineralize to their mature levels.
Proliferation - differentiation - morphogenesis
Tooth germ

50. What will the dental papilla eventually form?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Hereditary
Future dentin and pulp tissue
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants