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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. The stratum intermediate is located inner or outer?
Inner
Trauma - pressure or metabolic disease
Common on permanent molars or cingulum of anterior teeth
Compressed layer of flat to cuboidal cells

2. What happens during the cap stage?
Alveolar bone
Bud stage
Ameloblasts
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.

3. What is fusion?
Union of 2 adjacent tooth germs
Imbrication lines of von Ebner
Dens in dente - gemination - tubercle - and fusion
The ameloblasts

4. What are the formative cells for cementum?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ tries to divide
Hereditary
Cementoblasts

5. What type of tissue is enamel?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Epithelial
It disintegrates as the developing oral mucosa comes to line the oral cavity
Initiation

6. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Absence of single or multiple teeth
Dental tissues secreted as matrix in successive layers.
Alveolar bone

7. What stage does supernumerary teeth occur?
Dentin and alveolar bone
Trauma - pressure or metabolic disease
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Initiation

8. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Absence of single or multiple teeth
The dental lamina
Abnormally small teeth
Cementoblasts

9. How is the dentinocemental junction formed?
Ameloblasts
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
The basement membrane that seperates the enamel organ and dental papilla

10. What are the mature cells for dentin?
The ectomesenchyme
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Only dentinal tubules with processes
As a result of the apposition of cementum over dentin

11. What happens during the bell stage?
Union of root structure of two or more teeth by cementum
Dental tissues fully mineralize to their mature levels.
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Initiation

12. What are the mature cells for enamel?
Cementoid
The stellate reticulum
6th to 7th weeks
There are none - they are lost with eruption

13. What are the mature cells for cementum?
Cementocytes
The ameloblasts place an acellular dental cuticle on the new enamel surface
May be confused as calculus deposit on root
The basement membrane that seperates the enamel organ and dental papilla

14. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Future dentin and pulp tissue
The cementum - PDL - and alveolar bone
May be confused as calculus deposit on root

15. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
4 types
The ectomesenchyme - which was influenced by the neural crest cells
The enamel organ - dental papilla - dental sac

16. What are the etiological factors of tubercle?
Dental tissues secreted as matrix in successive layers.
In the cap stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Trauma - pressure or metabolic disease

17. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
8th week
The basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Compressed layer of flat to cuboidal cells

18. 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
The basement membrane that seperates the enamel organ and dental papilla
Arrest and reversal lines
Imbrication lines of von Ebner

19. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Cementoblasts
Hereditary
A mineralized cylinder - the dentinal tubule

20. What are the major components of the tooth germ?
Ameloblasts
The enamel organ - dental papilla - dental sac
The cervical loop
May be confused as calculus deposit on root

21. What is the main process involved in the bud stage?
Proliferation
Osteoblasts
Common on permanent molars or cingulum of anterior teeth
Ameloblasts

22. What will the dental sac give rise to?
Extra cusp due to effects on enamel organ
Pressure on the area
9th to 10th weeks
The cementum - PDL - and alveolar bone

23. What is tubercle?
Extra cusp due to effects on enamel organ
Outer
Proliferation
Trauma - pressure or metabolic disease

24. What are the cell layers found in the enamel organ in the bell stage?
Differentiation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementocytes
Commonly involves permanent maxillary lateral incisor and 3rd molars

25. What is microdontia?
Epithelial rests of Malassez
Bud stage
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
Abnormally small teeth

26. What are the etiological factors for supernumerary teeth?
Development of one or more extra teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary

27. What is the time span for the bud stage?
8th week
Differentiation
The outer cells of the dental papilla and the central cells of the dental papilla
Faulty development of enamel from interference involving ameloblasts

28. What is macrodontia?
Abnormally large teeth
The basement membrane
Proliferation - differentiation - morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

29. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Pressure on the area
Cementocytes
Dental tissues secreted as matrix in successive layers.

30. What are the mature cells for alveolar bone?
A bilayer rim that consists only IEE and OEE
Cementocytes
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Osteocytes

31. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Absence of single or multiple teeth
Dentin secreting cells (odontoblats)
It disintegrates as the developing oral mucosa comes to line the oral cavity
Faulty development of enamel from interference involving ameloblasts

32. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The ectomesenchyme
The apposition of the enamel matrix
There are none - they are lost with eruption
Tooth germ

33. Where is the dental sac originally derived from?
The ectomesenchyme
Compressed layer of flat to cuboidal cells
Absence of single or multiple teeth
Displacement of ameloblasts to root surface

34. What is the function of the Hertwig's epithelial root sheath?
Common with permanent maxillary molars
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Commonly involves permanent maxillary lateral incisor and 3rd molars
Arrest and reversal lines

35. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Faulty development of enamel from interference involving ameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Lines of Retzuis

36. What are the etiological factors for micro/macrodontia?
The tooth germ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary in localized form. endocrine dysfunction is complete
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

37. What are the odontoblastic processes is contained in what?
Odontoclasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Morphogenesis
A mineralized cylinder - the dentinal tubule

38. What happens during the maturation stage?
Induction - proliferation
Dental tissues fully mineralize to their mature levels.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Maturation

39. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
When the gingiva recedes and no actual tooth movement takes place
Ameloblasts
Apposition of the cementum

40. The stellate reticulum is located inner or outer?
The ectoderm
The cervical loop
Outer
The stellate reticulum

41. Do odontoblasts start their secretion of matrix before the ameloblasts?
The cervical loop
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary

42. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Odontoblasts
Sphere of enamel on root
Compressed layer of flat to cuboidal cells

43. How is the reduced enamel epithelium created?
The enamel organ is compressed
Traumatic injury or crowding of teeth
As a result of the apposition of cementum over dentin
Enamel organ invaginates into the dental papilla

44. How many types of cells are found in the enamel organ in the bell stage?
Dental tissues fully mineralize to their mature levels.
Hereditary
Enamel organ invaginates into the dental papilla
4 types

45. What is an enamel pearl?
Sphere of enamel on root
Initiation stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Tooth germ

46. Passive eruption
Preameloblasts
The apposition of the enamel matrix
When the gingiva recedes and no actual tooth movement takes place
Union of 2 adjacent tooth germs

47. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
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
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Odontoblastic process
Preameloblasts

48. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
The dental sac
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Oral epithelium

49. What are the formative cells for enamel?
The actual vertical movement of the tooth
The ectomesenchyme
4 types
Ameloblasts

50. What stage does the dental tissues subsequently fully mineralize
Bud stage
The outer cells of the dental papilla and the central cells of the dental papilla
Maturation
Inner