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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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1. What are the etiological factors for anodontia?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The enamel organ - dental papilla - dental sac
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

2. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Local or systemic or hereditary
Odontoclasts
The permanent molars
Trauma - pressure or metabolic disease

3. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Enamel organ invaginates into the dental papilla
Morphogenesis
Osteoblasts

4. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The primordium of the pulp
Tall columnar cells
Imbrication lines of von Ebner

5. What will the outer cells of the dental lamina differentiate into?
Odontoclasts
Development of one or more extra teeth
Osteocytes
Dentin secreting cells (odontoblats)

6. What is the time span for the bell stage?
11th to 12th weeks
Hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Osteoblasts

7. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementocytes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel organ

8. Tooth development
Proliferation - differentiation - morphogenesis
Odontogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Abnormally large teeth

9. What are the mature cells for alveolar bone?
The enamel organ
Initiation stage
Osteocytes
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

10. What is gemination?
Tooth germ tries to divide
Cementoblasts
Maturation
Enamel secreting cells (ameloblasts)

11. When does the process of root development take place?
Only dentinal tubules with processes
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Cementoblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

12. What are supernumerary teeth?
Future dentin and pulp tissue
Development of one or more extra teeth
Displacement of ameloblasts to root surface
11th to 12th weeks

13. What is the embryological background for enamel?
Enamel organ
4 types
Dental papilla
Outer

14. What is the predominate process in the bell stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Differentiation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

15. When does macro/microdontia occur?
Compressed layer of flat to cuboidal cells
The basement membrane
Bud stage
The enamel - dentin - and cementum are secreted in successive layers

16. What do the odontoblasts do?
The actual vertical movement of the tooth
Future dentin and pulp tissue
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla

17. What will the inner cells of the dental lamina differentiates into?
Morphogenesis
The actual vertical movement of the tooth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The primordium of the pulp

18. What are the mature cells for cementum?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementocytes
The actual vertical movement of the tooth
Morphogenesis

19. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Tall columnar cells
9th to 10th weeks
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

20. What are the clinical ramifications of anodontia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Enamel secreting cells (ameloblasts)
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Osteocytes

21. What is concrescence?
11th to 12th weeks
Abnormally small teeth
Union of root structure of two or more teeth by cementum
Enamel organ invaginates into the dental papilla

22. What are the incremental lines for dentin?
The enamel - dentin - and cementum are secreted in successive layers
Ameloblasts
Imbrication lines of von Ebner
8th week

23. What is the cap in the cap stage?
The enamel organ
Maturation
The tooth germ
The bud stage

24. What happens during the apposition stage?
The primordium of the pulp
Maturation
Dental tissues secreted as matrix in successive layers.
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

25. What is the time span for the bud stage?
Apposition of the cementum
Abnormally large teeth
Proliferation
8th week

26. What does the cervical loop consist of?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
A bilayer rim that consists only IEE and OEE
The basement membrane
Cuboidal cells

27. What are the mature cells for dentin?
Tooth germ
Alveolar bone
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.
Only dentinal tubules with processes

28. What are the etiological factors of tubercle?
Displacement of ameloblasts to root surface
Compressed layer of flat to cuboidal cells
Maturation
Trauma - pressure or metabolic disease

29. What is the main process involved in 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
Dentin and alveolar bone
Proliferation
The cervical loop

30. What is microdontia?
Abnormally small teeth
Odontoblasts
The permanent molars
When the gingiva recedes and no actual tooth movement takes place

31. What is tubercle?
There are none - they are lost with eruption
Alveolar bone
Extra cusp due to effects on enamel organ
9th to 10th weeks

32. What are the incremental lines for cementum and alveolar bone?
The basement membrane
Pressure on the area
Morphogenesis
Arrest and reversal lines

33. What are the processes involved in the cap stage?
The enamel organ
Proliferation - differentiation - morphogenesis
Sphere of enamel on root
Cementoid

34. What are the formative cells for enamel?
Development of one or more extra teeth
Ameloblasts
Enamel pearl - enamel dysplasia - and concresence
Cementoid

35. What are the formative cells for cementum?
Cementoblasts
The basement membrane
Cuboidal cells
The enamel organ

36. When does dens in dente occur?
The basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tooth germ
During the cap stage

37. What are the clinical ramifications of gemination?

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38. How is the reduced enamel epithelium created?
The enamel organ is compressed
There is unequal growth in different parts of the tooth bud
Odontoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

39. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
The ectomesenchyme
Local or systemic or hereditary
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.

40. What are the clinical ramifications of micro/macrodontia?
The basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementoid
Differentiation - proliferation - morphogenesis

41. What will the dental sac give rise to?
Odontoclasts
Dental papilla
Cementocytes
The cementum - PDL - and alveolar bone

42. What are the clinical ramifications of enamel dysplasia?
The enamel organ is compressed
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
In the cap stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

43. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The outer enamel epithelium
Tooth germ tries to divide
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

44. What happens during initiation?
Dentin secreting cells (odontoblats)
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
Osteocytes
Future dentin and pulp tissue

45. What are the developmental disturbances of the cap stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dens in dente - gemination - tubercle - and fusion
9th to 10th weeks
Commonly involves permanent maxillary lateral incisor and 3rd molars

46. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
During the cap stage
9th to 10th weeks
Tooth germ
The ectomesenchyme

47. What is amelogenisis?
Connective
The bud stage
The apposition of the enamel matrix
Enamel organ

48. What are the clinical ramifications?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Common on permanent molars or cingulum of anterior teeth
Dentin and alveolar bone
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

49. Where is the enamal organ originally derived from?
The cementum - PDL - and alveolar bone
Dental papilla
The ectoderm
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

50. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Dentin secreting cells (odontoblats)
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

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Dentistry Tooth Development And Eruption

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