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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. How many types of cells are found in the enamel organ in the bell stage?
Initiation stage
Osteocytes
The basement membrane
4 types

2. What is the time span for initiation?
The stellate reticulum
The enamel organ
6th to 7th weeks
Dentin and alveolar bone

3. What are the incremental lines for enamel?
Sphere of enamel on root
The permanent molars
Maturation
Lines of Retzuis

4. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The outer cells of the dental papilla and the central cells of the dental papilla
The apposition of the enamel matrix
The ameloblasts
The cementum - PDL - and alveolar bone

5. What are the etiological factors for micro/macrodontia?
Differentiation
The apposition of the enamel matrix
Hereditary in localized form. endocrine dysfunction is complete
The enamel organ

6. What are the formative cells for alveolar bone?
Tooth germ
Arrest and reversal lines
Bud stage
Osteoblasts

7. When does macro/microdontia occur?
Bud stage
Induction - proliferation
Epithelial
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.

8. What are the formative cells for enamel?
In the cap stage
Ameloblasts
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 organ

9. What is the predominate process of the cap stage?
Displacement of ameloblasts to root surface
Maturation
Cementoblasts
Morphogenesis

10. What is the main process involved in the bud stage?
Proliferation
Sphere of enamel on root
Dental papilla
The bud stage

11. What is the process involved in the maturation stage?
Dental papilla
Common with permanent maxillary molars
Maturation
The stellate reticulum

12. When does the process of root development take place?
Abnormally small teeth
11th to 12th weeks
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Epithelial rests of Malassez

13. What are the etiological factors of tubercle?
When the gingiva recedes and no actual tooth movement takes place
Dental papilla
Common on permanent molars or cingulum of anterior teeth
Trauma - pressure or metabolic disease

14. Where is the enamal organ originally derived from?
The ectoderm
Proliferation - differentiation - morphogenesis
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.
Imbrication lines of von Ebner

15. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Alveolar bone
Into odontoblasts
Abnormally large teeth

16. How is the dentinocemental junction formed?
Tooth germ tries to divide
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
As a result of the apposition of cementum over dentin
Preameloblasts

17. What is the embryological background for dentin - cementum and alveolar bone?
Enamel secreting cells (ameloblasts)
The bud stage
Dental papilla
6th to 7th weeks

18. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Sphere of enamel on root
Hereditary
Odontoblastic process
11th to 12th weeks

19. What are the etiological factors for enamel pearl?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane
A bilayer rim that consists only IEE and OEE
Displacement of ameloblasts to root surface

20. What is another name for the dental sac?
Abnormally small teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The enamel organ
Dental follicle

21. What is amelogenisis?
The enamel - dentin - and cementum are secreted in successive layers
Inner
The apposition of the enamel matrix
The basement membrane that seperates the enamel organ and dental papilla

22. What are the processes involved in the cap stage?
The enamel - dentin - and cementum are secreted in successive layers
The permanent molars
Oral epithelium
Proliferation - differentiation - morphogenesis

23. What are the clinical ramifications of micro/macrodontia?
Initiation
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dentin secreting cells (odontoblats)
Trauma - pressure or metabolic disease

24. 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
Abnormally large teeth
6th to 7th weeks
Differentiation

25. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
There are none - they are lost with eruption
Enamel
Osteocytes

26. What will the dental papilla eventually form?
Future dentin and pulp tissue
The dental sac
Epithelial
Bud stage

27. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Apposition of the cementum
The enamel organ is compressed
Pressure on the area
The dental sac

28. What are succedaneous teeth?
Lines of Retzuis
When the gingiva recedes and no actual tooth movement takes place
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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.

29. What happens during the maturation stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Commonly involves permanent maxillary lateral incisor and 3rd molars
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dental tissues fully mineralize to their mature levels.

30. 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
Commonly involves permanent maxillary lateral incisor and 3rd molars
When the gingiva recedes and no actual tooth movement takes place
Bud stage

31. What stage does anodontia occur?
Development of one or more extra teeth
Initiation stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tall columnar cells

32. What processes are involved with the apposition stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
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.
Induction - proliferation
Lines of Retzuis

33. What is the function of the Hertwig's epithelial root sheath?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Alveolar bone
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

34. What is concrescence?
Induction
During the cap stage
Union of root structure of two or more teeth by cementum
Osteoblasts

35. Where does the primordium of the permanent dentition develop?
The dental lamina
Enamel organ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel - dentin - and cementum are secreted in successive layers

36. What are the clinical ramifications of fusion?
The apposition of the enamel matrix
Dental papilla
The ameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

37. What are the mature cells for alveolar bone?
Pressure on the area
Osteocytes
Enamel secreting cells (ameloblasts)
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

38. What will the dental sac give rise to?
Local or systemic or hereditary
The cementum - PDL - and alveolar bone
Enamel
4 types

39. Which teeth are nonsuccedaneous?
The permanent molars
In the cap stage
Lines of Retzuis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

40. What do the odontoblasts do?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dentin and alveolar bone
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

41. What is matrix?
Faulty development of enamel from interference involving ameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

42. What are the clinical ramifications of gemination?

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43. What stage does the dental tissues subsequently fully mineralize
Odontoblasts
Differentiation - proliferation - morphogenesis
Enamel
Maturation

44. What is an enamel pearl?
Initiation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The outer enamel epithelium
Sphere of enamel on root

45. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

46. What hard tissue has vascularity?
Alveolar bone
Arrest and reversal lines
Cementoblasts
Odontoclasts

47. What is the cementum matrix called?
Cementoid
Osteoblasts
Dental tissues fully mineralize to their mature levels.
Dentin secreting cells (odontoblats)

48. What are the formative cells for dentin?
During the cap stage
Dental papilla
Odontoblasts
Maturation

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

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50. In the cap stage the tooth bud does not grow - what happens?
Enamel organ invaginates into the dental papilla
There is unequal growth in different parts of the tooth bud
The basement membrane
Sphere of enamel on root