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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. What are succedaneous teeth?
Dental follicle
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Induction
Hereditary in localized form. endocrine dysfunction is complete

2. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
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
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.
Common with permanent maxillary molars

3. When does dens in dente occur?
Alveolar bone
Extra cusp due to effects on enamel organ
During the cap stage
Cementoblasts

4. What layer serves as protection for the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
The outer enamel epithelium
Epithelial rests of Malassez
Development of one or more extra teeth

5. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The basement membrane
The enamel organ
The outer cells of the dental papilla and the central cells of the dental papilla
Only dentinal tubules with processes

6. What are the clinical ramifications of supernumerary teeth?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Future dentin and pulp tissue
The ameloblasts place an acellular dental cuticle on the new enamel surface
Local or systemic or hereditary

7. What are the etiological factors of tubercle?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Trauma - pressure or metabolic disease
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Cementocytes

8. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The dental lamina
The outer cells of the dental papilla and the central cells of the dental papilla
The ameloblasts
Outer

9. What are the cell layers found in the enamel organ in the bell stage?
The ectomesenchyme
Common with permanent maxillary molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The enamel - dentin - and cementum are secreted in successive layers

10. What is cementogenisis?
The permanent molars
Common on permanent molars or cingulum of anterior teeth
Apposition of the cementum
When the gingiva recedes and no actual tooth movement takes place

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

12. Where is the enamal organ originally derived from?
Odontogenesis
The dental lamina
The ectoderm
Bud stage

13. What are the etiological factors for anodontia?
Odontoblasts
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Odontogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

14. What is the embryological background for enamel?
Union of 2 adjacent tooth germs
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Tooth germ
Enamel organ

15. In the cap stage the tooth bud does not grow - what happens?
Commonly involves permanent maxillary lateral incisor and 3rd molars
A mineralized cylinder - the dentinal tubule
There is unequal growth in different parts of the tooth bud
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.

16. What is an enamel pearl?
Extra cusp due to effects on enamel organ
The ameloblasts
Sphere of enamel on root
Into odontoblasts

17. What is the time span for the bell stage?
Enamel secreting cells (ameloblasts)
Dens in dente - gemination - tubercle - and fusion
The basement membrane that seperates the enamel organ and dental papilla
11th to 12th weeks

18. What is tubercle?
Odontoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Extra cusp due to effects on enamel organ
During the cap stage

19. Where is the dental papilla originally derived from?
The basement membrane that seperates the enamel organ and dental papilla
The ectomesenchyme - which was influenced by the neural crest cells
Dental papilla
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

20. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The basement membrane that seperates the enamel organ and dental papilla
There is unequal growth in different parts of the tooth bud
The bud stage

21. The preameloblasts induce dental papilla cells to differentiate into what?
Sphere of enamel on root
The enamel organ - dental papilla - dental sac
Faulty development of enamel from interference involving ameloblasts
Into odontoblasts

22. What are the etiological factors for supernumerary teeth?
Abnormally small teeth
Hereditary
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ectomesenchyme

23. What are the developmental disturbances of the cap stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dens in dente - gemination - tubercle - and fusion
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The bud stage

24. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Pressure on the area
Imbrication lines of von Ebner
Enamel secreting cells (ameloblasts)

25. What is the time span for the cap stage?
9th to 10th weeks
Epithelial rests of Malassez
The enamel - dentin - and cementum are secreted in successive layers
Epithelial

26. What are the processes involved in the cap stage?
Differentiation - proliferation - morphogenesis
Only dentinal tubules with processes
Proliferation - differentiation - morphogenesis
During the cap stage

27. What is the main process involved in the bud stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Epithelial
Proliferation
Arrest and reversal lines

28. What are the clinical ramifications of fusion?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Abnormally small teeth
Preameloblasts

29. What happens during initiation?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Lines of Retzuis
Future dentin and pulp tissue
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

30. What will the outer cells of the dental lamina differentiate into?
When the gingiva recedes and no actual tooth movement takes place
The dental lamina
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dentin secreting cells (odontoblats)

31. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Pressure on the area
Dental papilla
8th week
The cervical loop

32. What stage does supernumerary teeth occur?
Odontogenesis
Initiation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Outer

33. What does the cervical loop consist of?
The outer enamel epithelium
A bilayer rim that consists only IEE and OEE
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

34. What is enamel dysplasia?
Traumatic injury or crowding of teeth
There is unequal growth in different parts of the tooth bud
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Faulty development of enamel from interference involving ameloblasts

35. What are the formative cells for alveolar bone?
Initiation stage
Tall columnar cells
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Osteoblasts

36. Active eruption
Inner
The actual vertical movement of the tooth
There is unequal growth in different parts of the tooth bud
Differentiation - proliferation - morphogenesis

37. What processes are involved with the apposition stage?
Future dentin and pulp tissue
Induction - proliferation
Hereditary
The basement membrane

38. How is the reduced enamel epithelium created?
Tall columnar cells
The enamel organ is compressed
The cervical loop
May be confused as calculus deposit on root

39. What are the formative cells for enamel?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The primordium of the pulp
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Ameloblasts

40. What is the predominate process in the bell stage?
Differentiation
8th week
Inner
Hereditary

41. What are the clinical ramifications of enamel pearl?
The enamel organ is compressed
Maturation
The stellate reticulum
May be confused as calculus deposit on root

42. What hard tissue has vascularity?
Alveolar bone
Trauma - pressure or metabolic disease
The actual vertical movement of the tooth
Enamel

43. What is another name for the dental sac?
Apposition of the cementum
Odontoblasts
Dental follicle
Dentin secreting cells (odontoblats)

44. What happens during the cap stage?
The dental sac
Abnormally small teeth
Cementocytes
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.

45. Do odontoblasts start their secretion of matrix before the ameloblasts?
Enamel organ
The ameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The outer enamel epithelium

46. What are the etiological factors of enamel dysplasia?
The basement membrane
Pressure on the area
Local or systemic or hereditary
Dental follicle

47. The stratum intermediate is located inner or outer?
Initiation stage
Dentin and alveolar bone
Inner
When the gingiva recedes and no actual tooth movement takes place

48. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
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
8th week

49. What are the mature cells for enamel?
There are none - they are lost with eruption
Alveolar bone
Epithelial rests of Malassez
Enamel organ invaginates into the dental papilla

50. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
4 types
Tooth germ
When the gingiva recedes and no actual tooth movement takes place
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing