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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 the formative cells for cementum?
Cementoblasts
The enamel organ
Common with permanent maxillary molars
Odontogenesis

2. What wll the inner enamel epithelium differentiate into?
Traumatic injury or crowding of teeth
Union of 2 adjacent tooth germs
Inner
Enamel secreting cells (ameloblasts)

3. What hard tissue has vascularity?
Absence of single or multiple teeth
Alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The bud stage

4. 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
In the cap stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

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

6. What are the processes involved in the cap stage?
Sphere of enamel on root
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
Morphogenesis
Proliferation - differentiation - morphogenesis

7. What layer serves as protection for the enamel organ?
Enamel secreting cells (ameloblasts)
The outer enamel epithelium
Lines of Retzuis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

8. What will the dental papilla eventually form?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Future dentin and pulp tissue
Proliferation - differentiation - morphogenesis

9. What is concrescence?
Union of root structure of two or more teeth by cementum
Oral epithelium
The dental sac
Outer

10. What stage does supernumerary teeth occur?
The bud stage
A mineralized cylinder - the dentinal tubule
Dental tissues fully mineralize to their mature levels.
Initiation

11. What kind of cells occur in the outer enamel epithelium in the bell stage?
Oral epithelium
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cuboidal cells
The enamel organ is compressed

12. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Future dentin and pulp tissue
Sphere of enamel on root
Commonly involves permanent maxillary lateral incisor and 3rd molars

13. How many types of cells are found in the enamel organ in the bell stage?
When the gingiva recedes and no actual tooth movement takes place
4 types
9th to 10th weeks
Into odontoblasts

14. What are the formative cells for enamel?
Ameloblasts
The dental sac
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
6th to 7th weeks

15. Active eruption
Osteoblasts
Inner
The actual vertical movement of the tooth
Bud stage

16. What is an enamel pearl?
The basement membrane
Sphere of enamel on root
Initiation
Commonly involves permanent maxillary lateral incisor and 3rd molars

17. What does the cervical loop consist of?
Outer
A bilayer rim that consists only IEE and OEE
Connective
It disintegrates as the developing oral mucosa comes to line the oral cavity

18. What else undergoes proliferation in the bud stage besides the dental lamina?
Bud stage
Dental tissues fully mineralize to their mature levels.
The ectomesenchyme
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

19. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The enamel - dentin - and cementum are secreted in successive layers
Development of one or more extra teeth
May be confused as calculus deposit on root

20. What processes are involved with the apposition stage?
May be confused as calculus deposit on root
Ameloblasts
Induction - proliferation
Cementoid

21. Where is the enamal organ originally derived from?
The ectoderm
Enamel secreting cells (ameloblasts)
The outer enamel epithelium
As a result of the apposition of cementum over dentin

22. What is another name for the dental sac?
Trauma - pressure or metabolic disease
Dental follicle
The enamel organ
Dental tissues fully mineralize to their mature levels.

23. What stage does the dental tissues subsequently fully mineralize
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Maturation
Morphogenesis
Only dentinal tubules with processes

24. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Epithelial rests of Malassez
Dentin secreting cells (odontoblats)
The outer cells of the dental papilla and the central cells of the dental papilla

25. What happens during the maturation stage?
Ameloblasts
Cementoblasts
Dental tissues fully mineralize to their mature levels.
The outer cells of the dental papilla and the central cells of the dental papilla

26. 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 ameloblasts
Hereditary
Tooth germ

27. What is the time span for the cap stage?
9th to 10th weeks
Bud stage
Epithelial
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

28. What is the time span for initiation?
6th to 7th weeks
Development of one or more extra teeth
Initiation stage
The permanent molars

29. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Proliferation - differentiation - morphogenesis
Compressed layer of flat to cuboidal cells
The basement membrane

30. What are the incremental lines for dentin?
Imbrication lines of von Ebner
The permanent molars
6th to 7th weeks
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

31. What are the clinical ramifications of fusion?
Enamel
Large tooth with two pulp cavities. one fewer tooth 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.
Local or systemic or hereditary

32. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Faulty development of enamel from interference involving ameloblasts
The permanent molars
Compressed layer of flat to cuboidal cells
Epithelial rests of Malassez

33. What is amelogenisis?
In the cap stage
The apposition of the enamel matrix
Osteoblasts
Dental tissues fully mineralize to their mature levels.

34. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Induction
The ameloblasts
Tooth germ
Cementocytes

35. What is the structure responsible for root development?
Epithelial rests of Malassez
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
The cervical loop
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

36. What type of tissue is enamel?
Dental follicle
Epithelial
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Differentiation

37. What stage does anodontia occur?
The primordium of the pulp
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The basement membrane
Initiation stage

38. When does the tooth bud become a tooth germ?
In the cap stage
Into odontoblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Common on permanent molars or cingulum of anterior teeth

39. The stratum intermediate is located inner or outer?
The basement membrane
9th to 10th weeks
Inner
Odontogenesis

40. 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
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
Only dentinal tubules with processes
Initiation stage

41. What is microdontia?
Compressed layer of flat to cuboidal cells
Dental papilla
Abnormally small teeth
During the cap stage

42. What is the cap in the cap stage?
Cementocytes
The basement membrane that seperates the enamel organ and dental papilla
The enamel organ
Traumatic injury or crowding of teeth

43. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Preameloblasts
Common on permanent molars or cingulum of anterior teeth
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

44. What are the mature cells for dentin?
Sphere of enamel on root
Only dentinal tubules with processes
Hereditary
Into odontoblasts

45. What are the mature cells for cementum?
Tooth germ
Cementocytes
The basement membrane that seperates the enamel organ and dental papilla
6th to 7th weeks

46. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Initiation stage
Odontoblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

47. What is the predominate process in the bell stage?
Cementoid
Union of 2 adjacent tooth germs
Differentiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

48. What is enamel dysplasia?
Trauma - pressure or metabolic disease
May be confused as calculus deposit on root
Faulty development of enamel from interference involving ameloblasts
Maturation

49. What is fusion?
Union of 2 adjacent tooth germs
Dentin and alveolar bone
Proliferation - differentiation - morphogenesis
Abnormally large teeth

50. Where is the dental sac originally derived from?
Trauma - pressure or metabolic disease
In the cap stage
Epithelial
The ectomesenchyme