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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 stage does anodontia occur?
Initiation stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
Induction
May be confused as calculus deposit on root

2. When does macro/microdontia occur?
The ectomesenchyme
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
Bud stage
Tall columnar cells

3. Which teeth are nonsuccedaneous?
The permanent molars
Odontoblastic process
Dental follicle
Abnormally small teeth

4. What are the clinical ramifications?
Enamel organ invaginates into the dental papilla
Enamel pearl - enamel dysplasia - and concresence
Common on permanent molars or cingulum of anterior teeth
There are none - they are lost with eruption

5. What is fusion?
The dental sac
Union of 2 adjacent tooth germs
Ameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

6. What are the cell layers found in the enamel organ in the bell stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Initiation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

7. What happens when the reduced enamel epithelium is created?
Faulty development of enamel from interference involving ameloblasts
Maturation
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
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

8. What type of tissue is enamel?
Epithelial
Cementoid
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dental follicle

9. What processes are involved with the apposition stage?
Traumatic injury or crowding of teeth
Induction - proliferation
When the gingiva recedes and no actual tooth movement takes place
The tooth germ

10. What hard tissue is innervated by nerves?
Future dentin and pulp tissue
Dentin and alveolar bone
Abnormally large teeth
The basement membrane

11. What is the primordium of the tooth?
Odontoblastic process
The tooth germ
Alveolar bone
The basement membrane

12. What does the cervical loop consist of?
Apposition of the cementum
A bilayer rim that consists only IEE and OEE
The ectomesenchyme
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

13. What are the clinical ramifications of gemination?

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

15. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
When the gingiva recedes and no actual tooth movement takes place
There are none - they are lost with eruption
Apposition of the cementum

16. What is the process involved in the maturation stage?
Maturation
Apposition of the cementum
Connective
The ectomesenchyme

17. What is tubercle?
Extra cusp due to effects on enamel organ
The basement membrane that seperates the enamel organ and dental papilla
Connective
Cementoid

18. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
The apposition of the enamel matrix
Induction
In the cap stage

19. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Dental tissues secreted as matrix in successive layers.
The ectomesenchyme
11th to 12th weeks

20. What is amelogenisis?
The apposition of the enamel matrix
Abnormally small teeth
Dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

21. The stellate reticulum is located inner or outer?
Compressed layer of flat to cuboidal cells
Outer
Hereditary
Trauma - pressure or metabolic disease

22. What kind of cells occur in the inner enamel epithelium?
Cementocytes
Pressure on the area
Tall columnar cells
Compressed layer of flat to cuboidal cells

23. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dental tissues secreted as matrix in successive layers.
11th to 12th weeks
Inner
It disintegrates as the developing oral mucosa comes to line the oral cavity

24. 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
Dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

25. What are the developmental disturbances of the cap stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Maturation
Dens in dente - gemination - tubercle - and fusion

26. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Enamel organ invaginates into the dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars
Hereditary

27. Do odontoblasts start their secretion of matrix before the ameloblasts?
Common on permanent molars or cingulum of anterior teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The apposition of the enamel matrix
Differentiation

28. What are the etiological factors for dens in dente and gemination?
The cementum - PDL - and alveolar bone
Hereditary
Enamel pearl - enamel dysplasia - and concresence
Osteoblasts

29. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Proliferation
When the gingiva recedes and no actual tooth movement takes place
Alveolar bone

30. What are the processes involved in the cap stage?
The permanent molars
Proliferation - differentiation - morphogenesis
Dental tissues fully mineralize to their mature levels.
Local or systemic or hereditary

31. What are the incremental lines for cementum and alveolar bone?
Dens in dente - gemination - tubercle - and fusion
A mineralized cylinder - the dentinal tubule
11th to 12th weeks
Arrest and reversal lines

32. What are the odontoblastic processes is contained in what?
11th to 12th weeks
Cementocytes
A mineralized cylinder - the dentinal tubule
Dental follicle

33. What will the dental sac give rise to?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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 cementum - PDL - and alveolar bone
Induction - proliferation

34. What are the incremental lines for enamel?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Lines of Retzuis
Sphere of enamel on root
Extra cusp due to effects on enamel organ

35. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
The apposition of the enamel matrix
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
A bilayer rim that consists only IEE and OEE

36. When does dens in dente occur?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
In the cap stage
During the cap stage
The enamel - dentin - and cementum are secreted in successive layers

37. What are the etiological factors for fusion?
During the cap stage
The dental lamina
Pressure on the area
Enamel organ

38. How is the dentinocemental junction formed?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
As a result of the apposition of cementum over dentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Outer

39. When does the process of root development take place?
Odontoblastic process
In the cap 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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

40. What happens during the bell stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Apposition of the cementum

41. What are the etiological factors for supernumerary teeth?
Hereditary
Trauma - pressure or metabolic disease
4 types
Absence of single or multiple teeth

42. Passive eruption
Induction
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
When the gingiva recedes and no actual tooth movement takes place
Absence of single or multiple teeth

43. What is the time span for initiation?
6th to 7th weeks
Initiation stage
Union of root structure of two or more teeth by cementum
The cervical loop

44. What are the formative cells for dentin?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Abnormally large teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoblasts

45. What is gemination?
In the cap stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Tooth germ tries to divide
The ameloblasts

46. What happens during the appositional stage?
Osteoblasts
The enamel organ
The enamel - dentin - and cementum are secreted in successive layers
Extra cusp due to effects on enamel organ

47. What are the clinical ramifications of anodontia?
The permanent molars
6th to 7th weeks
Tooth germ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

48. What are entrapped cementoblasts called?
Cementocytes
The basement membrane that seperates the enamel organ and dental papilla
Only dentinal tubules with processes
The bud stage

49. What is the embryological background for enamel?
Dentin secreting cells (odontoblats)
The ectomesenchyme - which was influenced by the neural crest cells
Enamel organ
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

50. What stage does supernumerary teeth occur?
The primordium of the pulp
Initiation
Epithelial rests of Malassez
Dental tissues secreted as matrix in successive layers.