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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 is gemination?
Cuboidal cells
Initiation
Induction - proliferation
Tooth germ tries to divide

2. What are succedaneous teeth?
Arrest and reversal lines
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Initiation stage
Connective

3. What is macrodontia?
Enamel secreting cells (ameloblasts)
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Abnormally large teeth
Hereditary

4. What is amelogenisis?
Abnormally large teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementoblasts
The apposition of the enamel matrix

5. What is tubercle?
9th to 10th weeks
Tooth germ tries to divide
Enamel pearl - enamel dysplasia - and concresence
Extra cusp due to effects on enamel organ

6. What is the time span for the cap stage?
Traumatic injury or crowding of teeth
The outer enamel epithelium
Odontogenesis
9th to 10th weeks

7. What type of tissue is dentin - cementum - and alveolar bone?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
8th week
The dental sac
Connective

8. What are the etiological factors for supernumerary teeth?
6th to 7th weeks
Hereditary
Commonly involves permanent maxillary lateral incisor and 3rd molars
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

9. Which layer in the bell stage has star shaped cells?
Initiation
The stellate reticulum
The actual vertical movement of the tooth
The apposition of the enamel matrix

10. When does dens in dente occur?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ectomesenchyme
During the cap stage
The outer enamel epithelium

11. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
The ameloblasts
Initiation stage
Proliferation - differentiation - morphogenesis

12. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
The stellate reticulum
When the gingiva recedes and no actual tooth movement takes place
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

13. The stellate reticulum is located inner or outer?
The bud stage
Cementoblasts
Outer
Dental tissues secreted as matrix in successive layers.

14. What is the main process involved in initiation?
Hereditary
Enamel organ invaginates into the dental papilla
Induction
Cementocytes

15. What processes are involved in the bell stage?
The basement membrane
Local or systemic or hereditary
Lines of Retzuis
Differentiation - proliferation - morphogenesis

16. What are the mature cells for cementum?
Faulty development of enamel from interference involving ameloblasts
Cementocytes
Cuboidal cells
Dentin secreting cells (odontoblats)

17. What will the dental papilla eventually form?
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.
Development of one or more extra teeth
Traumatic injury or crowding of teeth
Future dentin and pulp tissue

18. What processes are involved with the apposition stage?
Inner
The tooth germ
Induction - proliferation
The ectomesenchyme

19. What is dens in dente?
Cementoblasts
Odontoblasts
Enamel organ invaginates into the dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

20. What is concrescence?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Future dentin and pulp tissue
Cuboidal cells
Union of root structure of two or more teeth by cementum

21. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental sac
Enamel organ invaginates into the dental papilla
Sphere of enamel on root

22. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Enamel
The basement membrane
Only dentinal tubules with processes

23. What are the etiological factors of tubercle?
The outer enamel epithelium
Tooth germ
A bilayer rim that consists only IEE and OEE
Trauma - pressure or metabolic disease

24. When does macro/microdontia occur?
Ameloblasts
Bud stage
In the cap stage
Morphogenesis

25. What are the clinical ramifications of enamel dysplasia?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Compressed layer of flat to cuboidal cells
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
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

26. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Dental follicle
As a result of the apposition of cementum over dentin
Abnormally large teeth
The ameloblasts

27. What type of tissue is enamel?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Epithelial
Enamel secreting cells (ameloblasts)
Cementoid

28. What are the formative cells for cementum?
Cementocytes
Trauma - pressure or metabolic disease
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementoblasts

29. Tooth development
The ameloblasts place an acellular dental cuticle on the new enamel surface
Maturation
Apposition of the cementum
Odontogenesis

30. What are the mature cells for enamel?
Tooth germ tries to divide
8th week
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
There are none - they are lost with eruption

31. What are the incremental lines for cementum and alveolar bone?
Union of root structure of two or more teeth by cementum
Arrest and reversal lines
Enamel organ invaginates into the dental papilla
Development of one or more extra teeth

32. What are the formative cells for alveolar bone?
The enamel organ
Osteoblasts
The ameloblasts
Future dentin and pulp tissue

33. What is the structure responsible for root development?
The basement membrane
Maturation
Osteoblasts
The cervical loop

34. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Enamel organ invaginates into the dental papilla
Odontoblastic process
Proliferation - differentiation - morphogenesis

35. What kind of cells occur in the inner enamel epithelium?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Cementoid
Tall columnar cells

36. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Trauma - pressure or metabolic disease
There are none - they are lost with eruption
6th to 7th weeks
Odontoblastic process

37. What are the etiological factors for enamel pearl?
Osteoblasts
Apposition of the cementum
Tall columnar cells
Displacement of ameloblasts to root surface

38. What are the formative cells for dentin?
Cementoblasts
The enamel - dentin - and cementum are secreted in successive layers
Faulty development of enamel from interference involving ameloblasts
Odontoblasts

39. What are the clinical ramifications of supernumerary teeth?
Maturation
Cuboidal cells
Union of 2 adjacent tooth germs
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

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

41. What are the cell layers found in the enamel organ in the bell stage?
Bud stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Abnormally large teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

42. What are the clinical ramifications of anodontia?
The ectomesenchyme
The actual vertical movement of the tooth
A bilayer rim that consists only IEE and OEE
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

43. What are the clinical ramifications of enamel pearl?
The enamel organ is compressed
The ectomesenchyme
May be confused as calculus deposit on root
The primordium of the pulp

44. The stratum intermediate is located inner or outer?
In the cap stage
Inner
Abnormally small teeth
Faulty development of enamel from interference involving ameloblasts

45. What is an enamel pearl?
8th week
Sphere of enamel on root
Extra cusp due to effects on enamel organ
Odontogenesis

46. What hard tissue is can not have tissue formation after eruption?
Osteocytes
Enamel
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 ameloblasts

47. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
A mineralized cylinder - the dentinal tubule
Development of one or more extra teeth
Dental tissues secreted as matrix in successive layers.

48. Passive eruption
Proliferation
When the gingiva recedes and no actual tooth movement takes place
8th week
11th to 12th weeks

49. What is the predominate process of the cap stage?
Odontoclasts
The cementum - PDL - and alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Morphogenesis

50. What is the process involved in the maturation stage?
Preameloblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Maturation
Into odontoblasts