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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 are the mature cells for alveolar bone?
The tooth germ
6th to 7th weeks
Osteocytes
The ectomesenchyme - which was influenced by the neural crest cells

2. What happens during the appositional stage?
Compressed layer of flat to cuboidal cells
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla
The enamel - dentin - and cementum are secreted in successive layers

3. What hard tissue is innervated by nerves?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dentin and alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Proliferation

4. What type of tissue is dentin - cementum - and alveolar bone?
The permanent molars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental lamina
Connective

5. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Future dentin and pulp tissue
Pressure on the area
The ectomesenchyme

6. What is the predominate process of the cap stage?
Morphogenesis
The enamel - dentin - and cementum are secreted in successive layers
Tooth germ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

7. What is the site for the future dentioenamel junction?
Dental follicle
The basement membrane that seperates the enamel organ and dental papilla
Proliferation - differentiation - morphogenesis
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

8. What are supernumerary teeth?
Development of one or more extra teeth
Hereditary
A mineralized cylinder - the dentinal tubule
Odontoblasts

9. What are the clinical ramifications of dens in dente?
Epithelial
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The dental lamina
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

10. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Cementoid
The basement membrane
Induction - proliferation
Hereditary

11. How many types of cells are found in the enamel organ in the bell stage?
The permanent molars
Common on permanent molars or cingulum of anterior teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
4 types

12. What is macrodontia?
There is unequal growth in different parts of the tooth bud
Abnormally large teeth
Differentiation - proliferation - morphogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

13. What are the development disturbances of the apposition and maturation stages?
Tooth germ tries to divide
Hereditary in localized form. endocrine dysfunction is complete
Odontoblasts
Enamel pearl - enamel dysplasia - and concresence

14. What are the etiological factors for dens in dente and gemination?
Hereditary
Enamel organ
Tooth germ
Extra cusp due to effects on enamel organ

15. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Union of root structure of two or more teeth by cementum
The ameloblasts place an acellular dental cuticle on the new enamel surface
Abnormally large teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

16. What is the embryological background for dentin - cementum and alveolar bone?
Differentiation
Outer
Dental papilla
The permanent molars

17. Where is the dental sac originally derived from?
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 ectomesenchyme
A mineralized cylinder - the dentinal tubule
There is unequal growth in different parts of the tooth bud

18. What are the mature cells for cementum?
Odontoblastic process
Initiation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementocytes

19. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Outer
The ectoderm
Compressed layer of flat to cuboidal cells

20. Where is the enamal organ originally derived from?
Future dentin and pulp tissue
Cementocytes
The ectoderm
Hereditary in localized form. endocrine dysfunction is complete

21. What are the etiological factors of concrescence?
As a result of the apposition of cementum over dentin
Traumatic injury or crowding of teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Apposition of the cementum

22. What happens during the maturation stage?
Common on permanent molars or cingulum of anterior teeth
Dental tissues fully mineralize to their mature levels.
Union of root structure of two or more teeth by cementum
The outer cells of the dental papilla and the central cells of the dental papilla

23. What are the clinical ramifications of gemination?

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24. The stratum intermediate is located inner or outer?
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
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Inner
The primordium of the pulp

25. What is cementogenisis?
Apposition of the cementum
Dentin and alveolar bone
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

26. What is another name for the dental sac?
Cementocytes
Dental follicle
As a result of the apposition of cementum over dentin
Odontogenesis

27. What is anodontia?
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
Absence of single or multiple teeth
Initiation stage
A bilayer rim that consists only IEE and OEE

28. What is the function of the Hertwig's epithelial root sheath?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Abnormally small teeth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Extra cusp due to effects on enamel organ

29. What is tubercle?
Preameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Only dentinal tubules with processes
Extra cusp due to effects on enamel organ

30. What are the incremental lines for dentin?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Imbrication lines of von Ebner
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop

31. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
The apposition of the enamel matrix
Enamel pearl - enamel dysplasia - and concresence
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

32. What happens to the thickened non tooth producing portions of the dental lamina eventually?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
It disintegrates as the developing oral mucosa comes to line the oral cavity
Hereditary
The actual vertical movement of the tooth

33. What stage does anodontia occur?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Initiation stage
Dental follicle
Epithelial rests of Malassez

34. The oral epithelium is induced by the ectomesenchyme to produce what?
Arrest and reversal lines
Trauma - pressure or metabolic disease
The ectoderm
The dental lamina

35. What wll the inner enamel epithelium differentiate into?
Odontoblasts
Enamel secreting cells (ameloblasts)
The enamel organ
Extra cusp due to effects on enamel organ

36. What are the clinical ramifications of micro/macrodontia?
Dentin and alveolar bone
Induction
A bilayer rim that consists only IEE and OEE
Commonly involves permanent maxillary lateral incisor and 3rd molars

37. What kind of cells occur in the outer enamel epithelium in the bell stage?
Induction
Maturation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Cuboidal cells

38. What hard tissue has vascularity?
Alveolar bone
Abnormally small teeth
Epithelial rests of Malassez
The enamel organ is compressed

39. What layer serves as protection for the enamel organ?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The outer enamel epithelium
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Union of 2 adjacent tooth germs

40. Do odontoblasts start their secretion of matrix before the ameloblasts?
Dental tissues fully mineralize to their mature levels.
Proliferation - differentiation - morphogenesis
The enamel - dentin - and cementum are secreted in successive layers
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

41. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Initiation stage
Development of one or more extra teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

42. What happens when the reduced enamel epithelium is created?
Development of one or more extra teeth
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
In the cap stage
Inner

43. What is matrix?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the 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.
The enamel organ - dental papilla - dental sac
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

44. When does dens in dente occur?
During the cap stage
The ectomesenchyme
Cementoid
The stellate reticulum

45. What are the incremental lines for cementum and alveolar bone?
A mineralized cylinder - the dentinal tubule
Arrest and reversal lines
Traumatic injury or crowding of teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

46. The stellate reticulum is located inner or outer?
Outer
Proliferation
The basement membrane that seperates the enamel organ and dental papilla
The dental lamina

47. What are the clinical ramifications of enamel pearl?
Dental tissues fully mineralize to their mature levels.
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
May be confused as calculus deposit on root
The tooth germ

48. What is the main process involved in the bud stage?
Local or systemic or hereditary
Proliferation
Odontoclasts
Common on permanent molars or cingulum of anterior teeth

49. What is the time span for the cap stage?
Odontoblastic process
Enamel secreting cells (ameloblasts)
9th to 10th weeks
The basement membrane

50. What are the formative cells for dentin?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Outer
Extra cusp due to effects on enamel organ
Odontoblasts