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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 else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
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
Tall columnar cells
The cementum - PDL - and alveolar bone

2. Where is the dental sac originally derived from?
The ectomesenchyme
Development of one or more extra teeth
Cementoblasts
Epithelial

3. What hard tissue is innervated by nerves?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The cervical loop
Dentin and alveolar bone
Connective

4. What are the clinical ramifications of enamel pearl?
Oral epithelium
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Union of root structure of two or more teeth by cementum
May be confused as calculus deposit on root

5. What is concrescence?
The primordium of the pulp
Arrest and reversal lines
Development of one or more extra teeth
Union of root structure of two or more teeth by cementum

6. Which layer in the bell stage has star shaped cells?
Common on permanent molars or cingulum of anterior teeth
The stellate reticulum
Only dentinal tubules with processes
Enamel organ

7. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Compressed layer of flat to cuboidal cells
The enamel organ - dental papilla - dental sac
Abnormally small teeth
Preameloblasts

8. What are the odontoblastic processes is contained in what?
Commonly involves permanent maxillary lateral incisor and 3rd molars
A mineralized cylinder - the dentinal tubule
Differentiation - proliferation - morphogenesis
When the gingiva recedes and no actual tooth movement takes place

9. What kind of cells occur in the outer enamel epithelium in the bell stage?
Odontoblastic process
Cuboidal cells
The enamel organ is compressed
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

10. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
The enamel organ is compressed
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dentin secreting cells (odontoblats)

11. What stage does anodontia occur?
Dens in dente - gemination - tubercle - and fusion
There is unequal growth in different parts of the tooth bud
Initiation stage
Tall columnar cells

12. How many types of cells are found in the enamel organ in the bell stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
4 types
The permanent molars
The ectoderm

13. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dentin and alveolar bone
Dental papilla
Cementocytes

14. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Initiation stage

15. What is the site for the future dentioenamel junction?
Future dentin and pulp tissue
The basement membrane that seperates the enamel organ and dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel organ

16. What are the development disturbances of the apposition and maturation stages?
Faulty development of enamel from interference involving ameloblasts
A mineralized cylinder - the dentinal tubule
Enamel organ invaginates into the dental papilla
Enamel pearl - enamel dysplasia - and concresence

17. What are the mature cells for enamel?
The cervical loop
Initiation
The ectoderm
There are none - they are lost with eruption

18. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Dental papilla
Lines of Retzuis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The dental sac

19. How is the reduced enamel epithelium created?
The enamel organ is compressed
Tooth germ tries to divide
Hereditary
Cementocytes

20. What is an enamel pearl?
Enamel organ invaginates into the dental papilla
Sphere of enamel on root
Enamel pearl - enamel dysplasia - and concresence
Hereditary

21. What is the time span for initiation?
9th to 10th weeks
Arrest and reversal lines
Dental follicle
6th to 7th weeks

22. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dens in dente - gemination - tubercle - and fusion
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
It disintegrates as the developing oral mucosa comes to line the oral cavity

23. When does dens in dente occur?
Trauma - pressure or metabolic disease
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
During the cap stage
The ectoderm

24. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Hereditary
The ectomesenchyme - which was influenced by the neural crest cells
The basement membrane
Differentiation - proliferation - morphogenesis

25. What is the embryological background for dentin - cementum and alveolar bone?
4 types
Enamel organ invaginates into the dental papilla
Dental papilla
Pressure on the area

26. What is the time span for the cap stage?
The apposition of the enamel matrix
Tall columnar cells
Odontoblastic process
9th to 10th weeks

27. What kind of cells occur in the inner enamel epithelium?
Preameloblasts
Tall columnar cells
Maturation
May be confused as calculus deposit on root

28. What is the primordium of the tooth?
The ectomesenchyme
The tooth germ
Cementoblasts
11th to 12th weeks

29. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The enamel organ - dental papilla - dental sac
Epithelial rests of Malassez
Oral epithelium
May be confused as calculus deposit on root

30. What is the embryological background for enamel?
Enamel organ
Enamel
A mineralized cylinder - the dentinal tubule
Dental follicle

31. What hard tissue is can not have tissue formation after eruption?
Enamel
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
It disintegrates as the developing oral mucosa comes to line the oral cavity
8th week

32. 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
Absence of single or multiple teeth
Cuboidal cells
Odontoblastic process

33. What are the etiological factors for supernumerary teeth?
The ameloblasts
Hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Proliferation - differentiation - morphogenesis

34. Do odontoblasts start their secretion of matrix before the ameloblasts?
4 types
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Apposition of the cementum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

35. What type of tissue is enamel?
Inner
Epithelial
Trauma - pressure or metabolic disease
Enamel pearl - enamel dysplasia - and concresence

36. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Ameloblasts
As a result of the apposition of cementum over dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

37. What is the cap in the cap stage?
The enamel organ
The apposition of the enamel matrix
As a result of the apposition of cementum over dentin
Extra cusp due to effects on enamel organ

38. What do the odontoblasts do?
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
Dental follicle
Into odontoblasts

39. What is another name for the dental sac?
Oral epithelium
Odontoblasts
Tooth germ tries to divide
Dental follicle

40. What happens during the cap stage?
Cuboidal cells
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.
Sphere of enamel on root
Osteoblasts

41. What are the incremental lines for dentin?
Enamel secreting cells (ameloblasts)
Proliferation
Only dentinal tubules with processes
Imbrication lines of von Ebner

42. Tooth development
Odontogenesis
Displacement of ameloblasts to root surface
Cementocytes
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

43. What are the etiological factors for enamel pearl?
Hereditary
Displacement of ameloblasts to root surface
The permanent molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

44. What is enamel dysplasia?
4 types
Faulty development of enamel from interference involving ameloblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Absence of single or multiple teeth

45. When does the tooth bud become a tooth germ?
Faulty development of enamel from interference involving ameloblasts
Hereditary
In the cap stage
Union of root structure of two or more teeth by cementum

46. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Preameloblasts
Enamel organ invaginates into the dental papilla
There are none - they are lost with eruption

47. What are the etiological factors of enamel dysplasia?
There are none - they are lost with eruption
Sphere of enamel on root
Local or systemic or hereditary
Enamel organ

48. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Differentiation
Induction
Cementoblasts

49. What are the clinical ramifications of gemination?

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50. What are the clinical ramifications of supernumerary teeth?
Enamel pearl - enamel dysplasia - and concresence
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Only dentinal tubules with processes