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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. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The enamel organ is compressed
The ectomesenchyme - which was influenced by the neural crest cells
Enamel pearl - enamel dysplasia - and concresence

2. What are the clinical ramifications of dens in dente?
The cementum - PDL - and alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Absence of single or multiple teeth

3. When does the process of root development take place?
Hereditary
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dental tissues fully mineralize to their mature levels.
Epithelial

4. How many types of cells are found in the enamel organ in the bell stage?
A mineralized cylinder - the dentinal tubule
Ameloblasts
The outer enamel epithelium
4 types

5. Where is the dental sac originally derived from?
The ectomesenchyme
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental lamina
4 types

6. What is the time span for the bud stage?
Dentin and alveolar bone
Morphogenesis
Cementoblasts
8th week

7. What is enamel dysplasia?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
In the cap stage
Enamel pearl - enamel dysplasia - and concresence
Faulty development of enamel from interference involving ameloblasts

8. What are the clinical ramifications of gemination?

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9. What is the embryological background for enamel?
Maturation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Osteocytes
Enamel organ

10. What is the cementum matrix called?
The ectomesenchyme
The cervical loop
Imbrication lines of von Ebner
Cementoid

11. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Inner
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Oral epithelium

12. Which layer in the bell stage has star shaped cells?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Induction
The stellate reticulum
Osteocytes

13. What is the time span for the cap stage?
Union of root structure of two or more teeth by cementum
Dental papilla
9th to 10th weeks
Future dentin and pulp tissue

14. What hard tissue is innervated by nerves?
Absence of single or multiple teeth
The outer enamel epithelium
Imbrication lines of von Ebner
Dentin and alveolar bone

15. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Arrest and reversal lines
Preameloblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

16. How is the reduced enamel epithelium created?
The ameloblasts
The enamel organ is compressed
Dental tissues fully mineralize to their mature levels.
Dental papilla

17. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Dentin and alveolar bone
The cementum - PDL - and alveolar bone
Traumatic injury or crowding of teeth

18. What happens during initiation?
Osteocytes
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
Connective
Bud stage

19. What is the primordium of the tooth?
The tooth germ
Commonly involves permanent maxillary lateral incisor and 3rd molars
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

20. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Odontoclasts
Proliferation - differentiation - morphogenesis
During the cap stage

21. What does the cervical loop consist of?
The cervical loop
The outer cells of the dental papilla and the central cells of the dental papilla
Dental tissues fully mineralize to their mature levels.
A bilayer rim that consists only IEE and OEE

22. What are the formative cells for cementum?
Oral epithelium
Cementoid
Cementoblasts
There are none - they are lost with eruption

23. What are the etiological factors of concrescence?
Enamel pearl - enamel dysplasia - and concresence
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Traumatic injury or crowding of teeth
Only dentinal tubules with processes

24. What are the incremental lines for cementum and alveolar bone?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The enamel - dentin - and cementum are secreted in successive layers
Arrest and reversal lines
The actual vertical movement of the tooth

25. What are the processes involved in the cap stage?
May be confused as calculus deposit on root
The apposition of the enamel matrix
Lines of Retzuis
Proliferation - differentiation - morphogenesis

26. What is the time span for the bell stage?
11th to 12th weeks
Faulty development of enamel from interference involving ameloblasts
Dentin secreting cells (odontoblats)
9th to 10th weeks

27. In the cap stage the tooth bud does not grow - what happens?
The ectomesenchyme
There is unequal growth in different parts of the tooth bud
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Local or systemic or hereditary

28. What is another name for the dental sac?
Future dentin and pulp tissue
Cementoblasts
The primordium of the pulp
Dental follicle

29. What will the inner cells of the dental lamina differentiates into?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The primordium of the pulp
It disintegrates as the developing oral mucosa comes to line the oral cavity
Epithelial

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

31. When does the tooth bud become a tooth germ?
In the cap stage
Dentin secreting cells (odontoblats)
Ameloblasts
The ameloblasts

32. What happens during the bell stage?
The 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
Development of one or more extra teeth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

33. The oral epithelium is induced by the ectomesenchyme to produce what?
Union of 2 adjacent tooth germs
A bilayer rim that consists only IEE and OEE
Displacement of ameloblasts to root surface
The dental lamina

34. What is cementogenisis?
Extra cusp due to effects on enamel organ
In the cap stage
Apposition of the cementum
Inner

35. What is microdontia?
Abnormally small teeth
Induction - proliferation
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ectomesenchyme - which was influenced by the neural crest cells

36. Tooth development
Cuboidal cells
When the gingiva recedes and no actual tooth movement takes place
Only dentinal tubules with processes
Odontogenesis

37. What is gemination?
The ectomesenchyme
Imbrication lines of von Ebner
Tooth germ tries to divide
Displacement of ameloblasts to root surface

38. What happens during the appositional stage?
The primordium of the pulp
Preameloblasts
There are none - they are lost with eruption
The enamel - dentin - and cementum are secreted in successive layers

39. How is the dentinocemental junction formed?
Maturation
Apposition of the cementum
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
As a result of the apposition of cementum over dentin

40. What type of tissue is dentin - cementum - and alveolar bone?
Proliferation - differentiation - morphogenesis
Development of one or more extra teeth
Connective
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

41. What hard tissue is can not have tissue formation after eruption?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel
Osteocytes
Only dentinal tubules with processes

42. What will the dental sac give rise to?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The cementum - PDL - and alveolar bone
Epithelial
Hereditary

43. Where is the dental papilla originally derived from?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Traumatic injury or crowding of teeth
The ectomesenchyme - which was influenced by the neural crest cells
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

44. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Cuboidal cells
9th to 10th weeks
The basement membrane
The enamel organ - dental papilla - dental sac

45. What are the clinical ramifications of enamel pearl?
Odontoclasts
May be confused as calculus deposit on root
The permanent 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

46. What are the development disturbances of the apposition and maturation stages?
Enamel organ invaginates into the dental papilla
Osteoblasts
Outer
Enamel pearl - enamel dysplasia - and concresence

47. What is concrescence?
Hereditary
Union of root structure of two or more teeth by cementum
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
It disintegrates as the developing oral mucosa comes to line the oral cavity

48. What are the cell layers found in the enamel organ in the bell stage?
Odontogenesis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental tissues secreted as matrix in successive layers.
Induction

49. What is the embryological background for dentin - cementum and alveolar bone?
Dental tissues fully mineralize to their mature levels.
Dentin secreting cells (odontoblats)
Induction - proliferation
Dental papilla

50. What stage does the dental tissues subsequently fully mineralize
A bilayer rim that consists only IEE and OEE
Maturation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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