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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 stellate reticulum is located inner or outer?
Absence of single or multiple teeth
Outer
Future dentin and pulp tissue
8th week

2. The oral epithelium is induced by the ectomesenchyme to produce what?
Apposition of the cementum
Only dentinal tubules with processes
Dental tissues secreted as matrix in successive layers.
The dental lamina

3. What is another name for the dental sac?
The enamel organ - dental papilla - dental sac
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
Cementocytes
Dental follicle

4. What are the cell layers found in the enamel organ in the bell stage?
Enamel organ
Osteoblasts
Maturation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

5. What are the etiological factors for anodontia?
Hereditary
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The enamel organ
Faulty development of enamel from interference involving ameloblasts

6. What happens during initiation?
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
The enamel organ is compressed
Differentiation - proliferation - morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

7. Tooth development
Odontogenesis
The apposition of the enamel matrix
The cementum - PDL - and alveolar bone
Sphere of enamel on root

8. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Cementoblasts
Enamel
Epithelial

9. What are the formative cells for enamel?
Oral epithelium
Enamel pearl - enamel dysplasia - and concresence
Inner
Ameloblasts

10. What is anodontia?
May be confused as calculus deposit on root
Absence of single or multiple 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
The basement membrane that seperates the enamel organ and dental papilla

11. What are the etiological factors of concrescence?
Maturation
The basement membrane
Traumatic injury or crowding of teeth
Differentiation - proliferation - morphogenesis

12. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Initiation stage
There are none - they are lost with eruption
Dental tissues secreted as matrix in successive layers.

13. Do odontoblasts start their secretion of matrix before the ameloblasts?
6th to 7th weeks
The outer cells of the dental papilla and the central cells of the dental papilla
Dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

14. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Enamel
Enamel pearl - enamel dysplasia - and concresence

15. What is amelogenisis?
Tall columnar cells
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.
The apposition of the enamel matrix

16. What happens when the reduced enamel epithelium is created?
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
Proliferation - differentiation - morphogenesis
Odontoclasts
The basement membrane that seperates the enamel organ and dental papilla

17. What is the cap in the cap stage?
Dentin and alveolar bone
Outer
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ

18. What hard tissue is can not have tissue formation after eruption?
Enamel
11th to 12th weeks
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
A bilayer rim that consists only IEE and OEE

19. What type of tissue is dentin - cementum - and alveolar bone?
Abnormally small teeth
11th to 12th weeks
The permanent molars
Connective

20. What will the dental papilla eventually form?
Odontoclasts
Future dentin and pulp tissue
Extra cusp due to effects on enamel organ
Enamel pearl - enamel dysplasia - and concresence

21. What will the inner cells of the dental lamina differentiates into?
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.
The primordium of the pulp
Enamel organ
Inner

22. What are the incremental lines for enamel?
Lines of Retzuis
Osteocytes
Dental papilla
Union of 2 adjacent tooth germs

23. What is the outer portion of the ectoderm in the initiation stage?
Cementoid
Abnormally small teeth
Oral epithelium
The stellate reticulum

24. What is macrodontia?
Abnormally large teeth
Dens in dente - gemination - tubercle - and fusion
Enamel secreting cells (ameloblasts)
The cementum - PDL - and alveolar bone

25. What is the main process involved in initiation?
The dental sac
It disintegrates as the developing oral mucosa comes to line the oral cavity
Induction
Dental papilla

26. What are the processes involved in the cap stage?
The cementum - PDL - and alveolar bone
Proliferation - differentiation - morphogenesis
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectoderm

27. What will the dental sac give rise to?
Maturation
The cementum - PDL - and alveolar bone
Bud stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

28. 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
The dental sac
The ameloblasts place an acellular dental cuticle on the new enamel surface
Pressure on the area

29. What is the time span for the bud stage?
11th to 12th weeks
Initiation stage
8th week
The ectomesenchyme

30. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Cementoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dentin and alveolar bone

31. What stage does the dental tissues subsequently fully mineralize
Dental tissues fully mineralize to their mature levels.
Local or systemic or hereditary
Maturation
Cementoblasts

32. What wll the inner enamel epithelium differentiate into?
Proliferation
Preameloblasts
Common with permanent maxillary molars
Enamel secreting cells (ameloblasts)

33. What are the incremental lines for dentin?
Enamel organ invaginates into the dental papilla
Imbrication lines of von Ebner
The ectomesenchyme
The ectoderm

34. What are the formative cells for alveolar bone?
Odontogenesis
Osteoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The dental sac

35. What are entrapped cementoblasts called?
Abnormally large teeth
Outer
As a result of the apposition of cementum over dentin
Cementocytes

36. What are the clinical ramifications of supernumerary teeth?
Ameloblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Future dentin and pulp tissue

37. Where is the dental sac originally derived from?
The ectomesenchyme
During the cap stage
Common on permanent molars or cingulum of anterior teeth
Local or systemic or hereditary

38. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The ectomesenchyme
Odontoclasts
Preameloblasts
Enamel

39. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Odontoblastic process
Dental papilla
Induction - proliferation

40. What are the mature cells for cementum?
Inner
There are none - they are lost with eruption
Dental tissues secreted as matrix in successive layers.
Cementocytes

41. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Tooth germ
The dental lamina
Alveolar bone

42. When does the tooth bud become a tooth germ?
Imbrication lines of von Ebner
In the cap stage
Only dentinal tubules with processes
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

43. Which layer in the bell stage has star shaped cells?
A bilayer rim that consists only IEE and OEE
The stellate reticulum
Enamel organ invaginates into the dental papilla
Imbrication lines of von Ebner

44. What are the clinical ramifications of fusion?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel secreting cells (ameloblasts)
Commonly involves permanent maxillary lateral incisor and 3rd molars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

45. How many types of cells are found in the enamel organ in the bell stage?
9th to 10th weeks
4 types
Maturation
Cementoblasts

46. What are supernumerary teeth?
Enamel pearl - enamel dysplasia - and concresence
The primordium of the pulp
Development of one or more extra teeth
Ameloblasts

47. What are succedaneous teeth?
Displacement of ameloblasts to root surface
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Faulty development of enamel from interference involving ameloblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

48. What is the predominate process of the cap stage?
Morphogenesis
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
There is unequal growth in different parts of the tooth bud
Apposition of the cementum

49. What are the odontoblastic processes is contained in what?
The cementum - PDL - and alveolar bone
A mineralized cylinder - the dentinal tubule
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Ameloblasts

50. What are the formative cells for cementum?
Cementoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel
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