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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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1. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Hereditary in localized form. endocrine dysfunction is complete
Epithelial rests of Malassez
It disintegrates as the developing oral mucosa comes to line the oral cavity

2. What kind of cells reside in the stratum intermediate?
The dental sac
Compressed layer of flat to cuboidal cells
Displacement of ameloblasts to root surface
Dental tissues secreted as matrix in successive layers.

3. What is the cementum matrix called?
Cementoid
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells
The basement membrane

4. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
As a result of the apposition of cementum over dentin
The actual vertical movement of the tooth
Cementoblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars

5. What are the etiological factors of tubercle?
9th to 10th weeks
Epithelial
Cuboidal cells
Trauma - pressure or metabolic disease

6. What are entrapped cementoblasts called?
Morphogenesis
Oral epithelium
Cementocytes
The cementum - PDL - and alveolar bone

7. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Faulty development of enamel from interference involving ameloblasts
Dental tissues secreted as matrix in successive layers.
The bud stage
The ectoderm

8. What is cementogenisis?
Displacement of ameloblasts to root surface
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Apposition of the cementum
Inner

9. What is the cap in the cap stage?
Dentin and alveolar bone
Oral epithelium
The enamel organ
Cementoblasts

10. What processes are involved with the apposition stage?
In the cap stage
The outer enamel epithelium
Dental follicle
Induction - proliferation

11. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Extra cusp due to effects on enamel organ
Union of root structure of two or more teeth by cementum
The dental sac
Odontoclasts

12. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Apposition of the cementum
The outer enamel epithelium
The ameloblasts place an acellular dental cuticle on the new enamel surface

13. When does the process of root development take place?
In the cap stage
Enamel pearl - enamel dysplasia - and concresence
The apposition of the enamel matrix
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

14. What type of tissue is enamel?
The ameloblasts
The apposition of the enamel matrix
The outer enamel epithelium
Epithelial

15. How is the dentinocemental junction formed?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Only dentinal tubules with processes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
As a result of the apposition of cementum over dentin

16. When does dens in dente occur?
Development of one or more extra teeth
Dental papilla
During the cap stage
Induction - proliferation

17. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Epithelial rests of Malassez
Common with permanent maxillary molars

18. What are the etiological factors for dens in dente and gemination?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Tooth germ tries to divide
Dental papilla
Hereditary

19. What stage does supernumerary teeth occur?
The permanent molars
Osteocytes
Initiation
Enamel pearl - enamel dysplasia - and concresence

20. Passive eruption
Dentin and alveolar bone
Hereditary
When the gingiva recedes and no actual tooth movement takes place
Compressed layer of flat to cuboidal cells

21. What is enamel dysplasia?
Local or systemic or hereditary
Union of 2 adjacent tooth germs
Faulty development of enamel from interference involving ameloblasts
The actual vertical movement of the tooth

22. What is macrodontia?
Cuboidal cells
Odontoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Abnormally large teeth

23. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Enamel secreting cells (ameloblasts)
The basement membrane
When the gingiva recedes and no actual tooth movement takes place
Future dentin and pulp tissue

24. What are the incremental lines for enamel?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Maturation
Lines of Retzuis
Connective

25. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Lines of Retzuis
The dental lamina
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

26. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Odontoblasts
The ectoderm
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

27. What hard tissue is innervated by nerves?
Osteocytes
Cuboidal cells
Dentin and alveolar bone
The basement membrane

28. The stratum intermediate is located inner or outer?
May be confused as calculus deposit on root
Inner
The dental sac
Tall columnar cells

29. What are the clinical ramifications of fusion?
The basement membrane
The enamel - dentin - and cementum are secreted in successive layers
Osteocytes
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

30. What are the mature cells for alveolar bone?
Arrest and reversal lines
The basement membrane
Enamel secreting cells (ameloblasts)
Osteocytes

31. What is the time span for the bud stage?
Absence of single or multiple teeth
The bud stage
8th week
Faulty development of enamel from interference involving ameloblasts

32. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
11th to 12th weeks
Odontoblastic process
The basement membrane
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

33. What are the formative cells for enamel?
Enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Ameloblasts
Epithelial rests of Malassez

34. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
The outer enamel epithelium
Maturation
Local or systemic or hereditary

35. What will the inner cells of the dental lamina differentiates into?
Pressure on the area
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The primordium of the pulp
Maturation

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

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37. What does the cervical loop consist of?
Faulty development of enamel from interference involving ameloblasts
A bilayer rim that consists only IEE and OEE
The cementum - PDL - and alveolar bone
There are none - they are lost with eruption

38. What is fusion?
Union of 2 adjacent tooth germs
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
Future dentin and pulp tissue
Enamel pearl - enamel dysplasia - and concresence

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

40. What are the developmental disturbances of the cap stage?
The ectomesenchyme - which was influenced by the neural crest cells
Enamel
Dens in dente - gemination - tubercle - and fusion
4 types

41. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The dental lamina
Dental papilla
Preameloblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars

42. Where is the enamal organ originally derived from?
Differentiation - proliferation - morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectoderm

43. The oral epithelium is induced by the ectomesenchyme to produce what?
6th to 7th weeks
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The dental lamina
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

44. When does the tooth bud become a tooth germ?
Hereditary
In the cap stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental tissues fully mineralize to their mature levels.

45. The stellate reticulum is located inner or outer?
The enamel organ - dental papilla - dental sac
Outer
Preameloblasts
The basement membrane that seperates the enamel organ and dental papilla

46. What kind of cells occur in the outer enamel epithelium in the bell stage?
Arrest and reversal lines
Cuboidal cells
Pressure on the area
The permanent molars

47. What are the mature cells for dentin?
Only dentinal tubules with processes
Alveolar bone
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
Proliferation

48. What are the etiological factors of concrescence?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel - dentin - and cementum are secreted in successive layers
Traumatic injury or crowding of teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

49. What are the mature cells for enamel?
The ectomesenchyme
Dens in dente - gemination - tubercle - and fusion
Pressure on the area
There are none - they are lost with eruption

50. What else undergoes proliferation in the bud stage besides the dental lamina?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Absence of single or multiple teeth
The ectomesenchyme
Maturation

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Dentistry Tooth Development And Eruption

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