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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. What is cementogenisis?
Apposition of the cementum
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Hereditary
Displacement of ameloblasts to root surface

2. When does macro/microdontia occur?
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
Bud stage
Cementocytes
Odontoblasts

3. What are the formative cells for dentin?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoblasts
The enamel - dentin - and cementum are secreted in successive layers
11th to 12th weeks

4. What is the time span for the bell stage?
The ameloblasts
11th to 12th weeks
Union of 2 adjacent tooth germs
Maturation

5. What are the clinical ramifications of enamel dysplasia?
Apposition of the cementum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentin and alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

6. What will the inner cells of the dental lamina differentiates into?
Sphere of enamel on root
Epithelial rests of Malassez
The primordium of the pulp
Odontoclasts

7. What happens when the reduced enamel epithelium is created?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Proliferation
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
Tooth germ

8. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Compressed layer of flat to cuboidal cells
Dental tissues fully mineralize to their mature levels.
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The basement membrane

9. What kind of cells occur in the outer enamel epithelium in the bell stage?
Dentin secreting cells (odontoblats)
The basement membrane
Cuboidal cells
Common on permanent molars or cingulum of anterior teeth

10. What are the clinical ramifications of supernumerary teeth?
The basement membrane
The ectoderm
Epithelial
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

11. What kind of cells reside in the stratum intermediate?
11th to 12th weeks
Inner
Enamel
Compressed layer of flat to cuboidal cells

12. What are the etiological factors of tubercle?
Enamel
Trauma - pressure or metabolic disease
Future dentin and pulp tissue
During the cap stage

13. What stage does anodontia occur?
The enamel organ - dental papilla - dental sac
Initiation stage
Odontoclasts
Dental papilla

14. What layer serves as protection for the enamel organ?
Union of root structure of two or more teeth by cementum
The outer enamel epithelium
Osteoblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

15. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Inner
Union of 2 adjacent tooth germs
Cementocytes

16. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells
Initiation

17. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Absence of single or multiple teeth
Cementoblasts
Odontoblasts

18. What is the time span for 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
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The enamel organ
8th week

19. What is the process involved in the maturation stage?
The basement membrane that seperates the enamel organ and dental papilla
The basement membrane
Maturation
Dental tissues secreted as matrix in successive layers.

20. Where is the dental sac originally derived from?
6th to 7th weeks
The ectomesenchyme
The actual vertical movement of the tooth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

21. What is concrescence?
Union of root structure of two or more teeth by cementum
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontoblasts
The tooth germ

22. What is an enamel pearl?
Initiation stage
Sphere of enamel on root
Displacement of ameloblasts to root surface
Initiation

23. What are the clinical ramifications of enamel pearl?
Tall columnar cells
The enamel organ is compressed
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
May be confused as calculus deposit on root

24. What stage does supernumerary teeth occur?
Common with permanent maxillary molars
Enamel
Initiation
Future dentin and pulp tissue

25. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Induction - proliferation
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer cells of the dental papilla and the central cells of the dental papilla
Common on permanent molars or cingulum of anterior teeth

26. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Imbrication lines of von Ebner
Dental tissues fully mineralize to their mature levels.
It disintegrates as the developing oral mucosa comes to line the oral cavity

27. What type of tissue is enamel?
Maturation
The ameloblasts place an acellular dental cuticle on the new enamel surface
Epithelial
Traumatic injury or crowding of teeth

28. What will the dental papilla eventually form?
The dental lamina
Epithelial rests of Malassez
Future dentin and pulp tissue
Proliferation

29. The preameloblasts induce dental papilla cells to differentiate into what?
The permanent molars
Trauma - pressure or metabolic disease
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
Into odontoblasts

30. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementoblasts
8th week
Preameloblasts

31. What is microdontia?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Abnormally small teeth
The enamel organ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

32. What is another name for the dental sac?
Osteoblasts
Epithelial
Dental follicle
Cuboidal cells

33. What are the clinical ramifications of gemination?

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34. What are the mature cells for enamel?
There are none - they are lost with eruption
The ectomesenchyme - which was influenced by the neural crest cells
Traumatic injury or crowding of teeth
Induction

35. What is amelogenisis?
11th to 12th weeks
The apposition of the enamel matrix
The enamel organ
The cervical loop

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

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37. What happens during the cap stage?
Compressed layer of flat to cuboidal cells
Future dentin and pulp tissue
Enamel organ forms into cap - surrounding mass of dental papilla from the ectomesenchyme and surrounded by mass of dental sac also from the ectomesenchyme. Formation of the tooth germ.
A mineralized cylinder - the dentinal tubule

38. How many types of cells are found in the enamel organ in the bell stage?
The ectomesenchyme
Osteocytes
4 types
The basement membrane that seperates the enamel organ and dental papilla

39. What wll the inner enamel epithelium differentiate into?
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
Dentin and alveolar bone
Bud stage
Enamel secreting cells (ameloblasts)

40. What is matrix?
Oral epithelium
Pressure on the area
Induction
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

41. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The cementum - PDL - and alveolar bone
The ectoderm

42. What processes are involved in the bell stage?
Cementoid
Differentiation - proliferation - morphogenesis
The tooth germ
Odontogenesis

43. What are the etiological factors for fusion?
The enamel organ is compressed
Pressure on the area
Enamel organ
Ameloblasts

44. What kind of cells occur in the inner enamel epithelium?
Initiation
Enamel pearl - enamel dysplasia - and concresence
Union of 2 adjacent tooth germs
Tall columnar cells

45. What are the etiological factors for dens in dente and gemination?
Only dentinal tubules with processes
Odontogenesis
Hereditary
Preameloblasts

46. What is the outer portion of the ectoderm in the initiation stage?
Hereditary
Lines of Retzuis
6th to 7th weeks
Oral epithelium

47. What does the cervical loop consist of?
The permanent molars
Lines of Retzuis
Enamel organ
A bilayer rim that consists only IEE and OEE

48. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
8th week
The bud stage
The cementum - PDL - and alveolar bone
Dentin and alveolar bone

49. When does the tooth bud become a tooth germ?
During the cap stage
In the cap stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The basement membrane

50. What is dens in dente?
Dentin and alveolar bone
Enamel organ invaginates into the dental papilla
Oral epithelium
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

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Dentistry Tooth Development And Eruption

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