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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. What else undergoes proliferation in the bud stage besides the dental lamina?
The bud stage
Connective
The ectoderm
The ectomesenchyme

2. What are the etiological factors for supernumerary teeth?
The enamel organ is compressed
Hereditary
11th to 12th weeks
Osteoblasts

3. What will the outer cells of the dental lamina differentiate into?
There is unequal growth in different parts of the tooth bud
Outer
Dentin secreting cells (odontoblats)
Osteocytes

4. What is concrescence?
Pressure on the area
Apposition of the cementum
As a result of the apposition of cementum over dentin
Union of root structure of two or more teeth by cementum

5. What happens during the cap stage?
The cervical loop
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
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.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

6. What is the structure responsible for root development?
The ectoderm
Cementoblasts
The cervical loop
The apposition of the enamel matrix

7. When does the tooth bud become a tooth germ?
Common with permanent maxillary molars
In the cap stage
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 actual vertical movement of the tooth

8. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Imbrication lines of von Ebner
Morphogenesis
When the gingiva recedes and no actual tooth movement takes place

9. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
8th week
The ectoderm
Epithelial

10. What happens during the bell stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Compressed layer of flat to cuboidal cells
During the cap stage

11. How is the dentinocemental junction formed?
Inner
Common with permanent maxillary molars
Only dentinal tubules with processes
As a result of the apposition of cementum over dentin

12. What are the clinical ramifications of concrescence?
Trauma - pressure or metabolic disease
Common with permanent maxillary molars
Alveolar bone
The dental sac

13. What hard tissue is innervated by nerves?
Dentin and alveolar bone
The enamel organ
The dental lamina
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

14. What is matrix?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Initiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
4 types

15. What are the clinical ramifications of fusion?
Epithelial rests of Malassez
Connective
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
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

16. What is anodontia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Osteoblasts
Absence of single or multiple teeth
The bud stage

17. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Tall columnar cells
Future dentin and pulp tissue
Enamel organ invaginates into the dental papilla

18. 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
Cementocytes
Ameloblasts
Initiation

19. What kind of cells reside in the stratum intermediate?
Differentiation
Compressed layer of flat to cuboidal cells
Lines of Retzuis
When the gingiva recedes and no actual tooth movement takes place

20. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Hereditary in localized form. endocrine dysfunction is complete
Odontoblastic process

21. What is the time span for the bell stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
11th to 12th weeks
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
Odontoblastic process

22. When does the process of root development take place?
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
Odontoclasts
4 types

23. What kind of cells occur in the inner enamel epithelium?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel secreting cells (ameloblasts)
Tall columnar cells
The enamel organ

24. What are the incremental lines for enamel?
Displacement of ameloblasts to root surface
The dental lamina
The outer cells of the dental papilla and the central cells of the dental papilla
Lines of Retzuis

25. What is the predominate process of the cap stage?
Extra cusp due to effects on enamel organ
Morphogenesis
Trauma - pressure or metabolic disease
Hereditary in localized form. endocrine dysfunction is complete

26. What layer serves as protection for the enamel organ?
The outer enamel epithelium
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Common on permanent molars or cingulum of anterior teeth
Pressure on the area

27. What is the cementum matrix called?
The ectomesenchyme - which was influenced by the neural crest cells
Faulty development of enamel from interference involving ameloblasts
Enamel
Cementoid

28. What happens during the appositional stage?
Hereditary
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
The dental lamina

29. What is an enamel pearl?
There are none - they are lost with eruption
Oral epithelium
Sphere of enamel on root
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

30. 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
Enamel organ invaginates into the dental papilla
Connective
Odontoblastic process

31. What are the etiological factors for dens in dente and gemination?
Imbrication lines of von Ebner
6th to 7th weeks
Trauma - pressure or metabolic disease
Hereditary

32. What is the outer portion of the ectoderm in the initiation stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
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
Oral epithelium
The enamel organ - dental papilla - dental sac

33. What is microdontia?
The cementum - PDL - and alveolar bone
Differentiation
Abnormally small teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

34. What processes are involved with the apposition stage?
The permanent molars
The basement membrane
Odontoblastic process
Induction - proliferation

35. What is the predominate process in the bell stage?
The enamel organ is compressed
Dental follicle
Differentiation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

36. What hard tissue has vascularity?
The outer cells of the dental papilla and the central cells of the dental papilla
Proliferation - differentiation - morphogenesis
The apposition of the enamel matrix
Alveolar bone

37. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Cementocytes
A mineralized cylinder - the dentinal tubule
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

38. What is the cap in the cap stage?
Cementoid
The enamel organ
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The primordium of the pulp

39. What are the cell layers found in the enamel organ in the bell stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The bud stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The tooth germ

40. What do the odontoblasts do?
The tooth germ
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontoblastic process
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

41. What is amelogenisis?
Lines of Retzuis
Tooth germ
The apposition of the enamel matrix
Connective

42. Where is the enamal organ originally derived from?
The primordium of the pulp
The ectoderm
Outer
8th week

43. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
The ectomesenchyme - which was influenced by the neural crest cells
Union of root structure of two or more teeth by cementum
Initiation stage

44. In the cap stage the tooth bud does not grow - what happens?
Odontoblastic process
Bud stage
Dentin and alveolar bone
There is unequal growth in different parts of the tooth bud

45. What type of tissue is enamel?
The basement membrane that seperates the enamel organ and dental papilla
There are none - they are lost with eruption
Epithelial
In the cap stage

46. What are the clinical ramifications of enamel pearl?
Compressed layer of flat to cuboidal cells
May be confused as calculus deposit on root
Development of one or more extra teeth
The primordium of the pulp

47. The stellate reticulum is located inner or outer?
There is unequal growth in different parts of the tooth bud
The enamel organ
Outer
Maturation

48. What are the formative cells for enamel?
Enamel organ
Ameloblasts
The ameloblasts
Cementoid

49. Where does the primordium of the permanent dentition develop?
Epithelial
Hereditary in localized form. endocrine dysfunction is complete
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Cementocytes

50. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Common with permanent maxillary molars
The basement membrane
Initiation stage
Oral epithelium