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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. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Odontoblastic process
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

2. What is the time span for initiation?
Cementocytes
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Hereditary in localized form. endocrine dysfunction is complete
6th to 7th weeks

3. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The cementum - PDL - and alveolar bone
The primordium of the pulp
The basement membrane
Sphere of enamel on root

4. What are the etiological factors for enamel pearl?
As a result of the apposition of cementum over dentin
Displacement of ameloblasts to root surface
Trauma - pressure or metabolic disease
Cementocytes

5. What are the odontoblastic processes is contained in what?
Tall columnar cells
The permanent molars
Enamel
A mineralized cylinder - the dentinal tubule

6. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Preameloblasts
Osteoblasts
Proliferation - differentiation - morphogenesis
Dental papilla

7. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Union of root structure of two or more teeth by cementum
Dentin secreting cells (odontoblats)
Differentiation

8. Passive eruption
The outer enamel epithelium
Osteoblasts
When the gingiva recedes and no actual tooth movement takes place
Outer

9. What is fusion?
Connective
The enamel organ - dental papilla - dental sac
Dental follicle
Union of 2 adjacent tooth germs

10. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Union of root structure of two or more teeth by cementum
Imbrication lines of von Ebner
Maturation

11. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
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
Oral epithelium
11th to 12th weeks
The outer cells of the dental papilla and the central cells of the dental papilla

12. What are entrapped cementoblasts called?
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
Enamel secreting cells (ameloblasts)
Hereditary
Cementocytes

13. What will the inner cells of the dental lamina differentiates into?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Maturation
The primordium of the pulp
Tall columnar cells

14. What are the mature cells for dentin?
Only dentinal tubules with processes
Alveolar bone
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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

15. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Hereditary
The basement membrane
Dental follicle

16. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Traumatic injury or crowding of teeth
Cementoblasts
Odontoblastic process
Induction - proliferation

17. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Cementoblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
8th week
Compressed layer of flat to cuboidal cells

18. What happens during initiation?
Odontoblastic process
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
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Common on permanent molars or cingulum of anterior teeth

19. What are the major components of the tooth germ?
Induction
The enamel organ - dental papilla - dental sac
Apposition of the cementum
Connective

20. What is the time span for the bell stage?
The cervical loop
11th to 12th weeks
Pressure on the area
The ameloblasts place an acellular dental cuticle on the new enamel surface

21. How many types of cells are found in the enamel organ in the bell stage?
The ectomesenchyme
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Induction - proliferation
4 types

22. What happens during the cap stage?
Dental papilla
The stellate reticulum
11th to 12th weeks
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.

23. When does dens in dente occur?
Preameloblasts
During the cap stage
Tooth germ tries to divide
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

24. How is the reduced enamel epithelium created?
Imbrication lines of von Ebner
Cementoblasts
The enamel organ is compressed
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

25. What causes the induction of the preameloblasts to differentiate into ameloblasts?
There is unequal growth in different parts of the tooth bud
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The basement membrane
Traumatic injury or crowding of teeth

26. What is dens in dente?
Only dentinal tubules with processes
Enamel organ invaginates into the dental papilla
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Imbrication lines of von Ebner

27. The stratum intermediate is located inner or outer?
Lines of Retzuis
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Inner
Extra cusp due to effects on enamel organ

28. Where is the enamel matrix secreted from by the ameloblasts?

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29. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Abnormally small teeth
As a result of the apposition of cementum over dentin
9th to 10th weeks

30. What type of tissue is enamel?
Proliferation - differentiation - morphogenesis
Epithelial
Initiation
The bud stage

31. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The primordium of the pulp
The permanent molars

32. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Trauma - pressure or metabolic disease
Preameloblasts
Tooth germ

33. What are the clinical ramifications of dens in dente?
During the cap stage
Maturation
In the cap stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

34. What stage does anodontia occur?
Initiation stage
Ameloblasts
Only dentinal tubules with processes
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

35. What is enamel dysplasia?
Differentiation
The enamel organ is compressed
Hereditary
Faulty development of enamel from interference involving ameloblasts

36. What is tubercle?
Extra cusp due to effects on enamel organ
Bud stage
The ectomesenchyme
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

37. What are the etiological factors for supernumerary teeth?
Dentin and alveolar bone
Hereditary
Displacement of ameloblasts to root surface
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

38. What is anodontia?
Absence of single or multiple teeth
Local or systemic or hereditary
Maturation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

39. What hard tissue is can not have tissue formation after eruption?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Initiation
Enamel
Epithelial rests of Malassez

40. What are supernumerary teeth?
Development of one or more extra teeth
Dental papilla
Inner
Hereditary

41. What processes are involved in the bell stage?
There are none - they are lost with eruption
Differentiation - proliferation - morphogenesis
The dental sac
The apposition of the enamel matrix

42. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Induction
Tooth germ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

43. What is the outer portion of the ectoderm in the initiation stage?
The basement membrane that seperates the enamel organ and dental papilla
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
8th week
Oral epithelium

44. What are the clinical ramifications of fusion?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The primordium of the pulp
The ectomesenchyme
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

45. What layer serves as protection for the enamel organ?
Abnormally large teeth
The outer enamel epithelium
Future dentin and pulp tissue
Displacement of ameloblasts to root surface

46. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Maturation

47. What will the dental sac give rise to?
Odontoclasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The cementum - PDL - and alveolar bone
The primordium of the pulp

48. What are the formative cells for cementum?
Arrest and reversal lines
Into odontoblasts
Hereditary
Cementoblasts

49. What kind of cells reside in the stratum intermediate?
Displacement of ameloblasts to root surface
Tall columnar cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Compressed layer of flat to cuboidal cells

50. What are the incremental lines for enamel?
The permanent molars
Lines of Retzuis
Tall columnar cells
Into odontoblasts