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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 etiological factors for enamel pearl?
11th to 12th weeks
The dental lamina
Displacement of ameloblasts to root surface
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

2. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Induction
11th to 12th weeks

3. Where is the dental papilla originally derived from?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Into odontoblasts
Osteoblasts
The ectomesenchyme - which was influenced by the neural crest cells

4. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
4 types
Hereditary
Enamel pearl - enamel dysplasia - and concresence
Preameloblasts

5. What are the etiological factors of concrescence?
Displacement of ameloblasts to root surface
Traumatic injury or crowding of teeth
Trauma - pressure or metabolic disease
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

6. Active eruption
The actual vertical movement of the tooth
The ectoderm
The bud stage
Cementocytes

7. What type of tissue is enamel?
Extra cusp due to effects on enamel organ
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
Epithelial
Connective

8. What are the developmental disturbances of the cap stage?
Tooth germ
Maturation
Dens in dente - gemination - tubercle - and fusion
The ectoderm

9. What happens during the cap stage?
Dentin and alveolar bone
Connective
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
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.

10. What are the mature cells for cementum?
Common with permanent maxillary molars
4 types
Cementocytes
Cementoid

11. What is the site for the future dentioenamel junction?
The enamel organ is compressed
The basement membrane that seperates the enamel organ and dental papilla
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The apposition of the enamel matrix

12. When does dens in dente occur?
During the cap stage
The outer enamel epithelium
The enamel - dentin - and cementum are secreted in successive layers
Differentiation

13. What is the predominate process of the cap stage?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Morphogenesis
4 types
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

14. What is the embryological background for enamel?
Maturation
Sphere of enamel on root
Enamel organ
Enamel

15. What hard tissue is innervated by nerves?
Dentin and alveolar bone
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Enamel
Odontoblastic process

16. What is another name for the dental sac?
Dental follicle
Tooth germ tries to divide
Development of one or more extra teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

17. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
The enamel - dentin - and cementum are secreted in successive layers
Tall columnar cells
Odontoblasts

18. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
May be confused as calculus deposit on root
Dental papilla
Initiation stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

19. What happens during the apposition stage?
4 types
As a result of the apposition of cementum over dentin
Dental tissues secreted as matrix in successive layers.
Union of root structure of two or more teeth by cementum

20. What is concrescence?
Epithelial
Odontoblastic process
Enamel organ
Union of root structure of two or more teeth by cementum

21. What is cementogenisis?
9th to 10th weeks
Cementoblasts
Faulty development of enamel from interference involving ameloblasts
Apposition of the cementum

22. What are the processes involved in the cap stage?
The apposition of the enamel matrix
Morphogenesis
Hereditary
Proliferation - differentiation - morphogenesis

23. What are the mature cells for alveolar bone?
Osteocytes
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Ameloblasts
Differentiation - proliferation - morphogenesis

24. What stage does anodontia occur?
The primordium of the pulp
Initiation stage
During the cap stage
Alveolar bone

25. The stratum intermediate is located inner or outer?
Inner
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
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

26. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
During the cap stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

27. What are the etiological factors for fusion?
Trauma - pressure or metabolic disease
Pressure on the area
Development of one or more extra teeth
The basement membrane that seperates the enamel organ and dental papilla

28. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Dens in dente - gemination - tubercle - and fusion
The cementum - PDL - and alveolar bone
The dental sac

29. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Trauma - pressure or metabolic disease
Initiation stage
Cementoblasts

30. What is matrix?
The enamel organ is compressed
Lines of Retzuis
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

31. When does the tooth bud become a tooth germ?
The enamel organ is compressed
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
In the cap stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

32. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectoderm
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Maturation

33. The oral epithelium is induced by the ectomesenchyme to produce what?
Pressure on the area
The enamel organ
The dental lamina
The cementum - PDL - and alveolar bone

34. What do the odontoblasts do?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
6th to 7th weeks
The tooth germ

35. What kind of cells occur in the inner enamel epithelium?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dentin secreting cells (odontoblats)
The actual vertical movement of the tooth
Tall columnar cells

36. What is the main process involved in initiation?
Alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The basement membrane that seperates the enamel organ and dental papilla
Induction

37. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Proliferation - differentiation - morphogenesis
Odontoblastic process
Cementocytes

38. What will the dental papilla eventually form?
Only dentinal tubules with processes
Future dentin and pulp tissue
Enamel secreting cells (ameloblasts)
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.

39. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Enamel secreting cells (ameloblasts)
The ameloblasts
A mineralized cylinder - the dentinal tubule
Hereditary

40. What are the clinical ramifications of enamel dysplasia?
9th to 10th weeks
Union of root structure of two or more teeth by cementum
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

41. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
The bud stage
The ectoderm
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

42. Which layer in the bell stage has star shaped cells?
Enamel
Faulty development of enamel from interference involving ameloblasts
The ameloblasts
The stellate reticulum

43. What is the time span for the cap stage?
Osteoblasts
Dentin secreting cells (odontoblats)
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
9th to 10th weeks

44. How is the reduced enamel epithelium created?
During the cap stage
Cementocytes
The enamel organ is compressed
Connective

45. Passive eruption
Oral epithelium
Enamel pearl - enamel dysplasia - and concresence
When the gingiva recedes and no actual tooth movement takes place
Imbrication lines of von Ebner

46. What are the etiological factors for supernumerary teeth?
Into odontoblasts
Hereditary
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
A bilayer rim that consists only IEE and OEE

47. What stage does supernumerary teeth occur?
Odontogenesis
Faulty development of enamel from interference involving ameloblasts
Initiation
Common on permanent molars or cingulum of anterior teeth

48. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The outer cells of the dental papilla and the central cells of the dental papilla
Dentin secreting cells (odontoblats)
Inner

49. What are the mature cells for dentin?
11th to 12th weeks
Only dentinal tubules with processes
Arrest and reversal lines
Cuboidal cells

50. How is the dentinocemental junction formed?
The bud stage
Dental tissues secreted as matrix in successive layers.
As a result of the apposition of cementum over dentin
Odontogenesis