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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 incremental lines for dentin?
Abnormally small teeth
Traumatic injury or crowding of teeth
The ectomesenchyme
Imbrication lines of von Ebner

2. What are supernumerary teeth?
Development of one or more extra teeth
The ectomesenchyme - which was influenced by the neural crest cells
The ectomesenchyme
Proliferation

3. What are the mature cells for cementum?
Cementocytes
Epithelial
Imbrication lines of von Ebner
The outer cells of the dental papilla and the central cells of the dental papilla

4. What are the formative cells for enamel?
Union of 2 adjacent tooth germs
Future dentin and pulp tissue
The ectoderm
Ameloblasts

5. What is the cap in the cap stage?
The enamel organ
The cementum - PDL - and alveolar bone
Induction - proliferation
Dental papilla

6. What is the main process involved in the bud stage?
Dentin secreting cells (odontoblats)
Proliferation
Abnormally large teeth
Union of root structure of two or more teeth by cementum

7. What processes are involved in the bell stage?
The dental lamina
As a result of the apposition of cementum over dentin
Differentiation - proliferation - morphogenesis
Cementocytes

8. What is the process involved in the maturation stage?
The ectomesenchyme - which was influenced by the neural crest cells
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
Maturation
The cervical loop

9. Which layer in the bell stage has star shaped cells?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Odontoclasts
Dental follicle
The stellate reticulum

10. What will the dental papilla eventually form?
Cementocytes
Dental tissues secreted as matrix in successive layers.
Future dentin and pulp tissue
Arrest and reversal lines

11. The stratum intermediate is located inner or outer?
Inner
The cervical loop
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

12. What happens when the reduced enamel epithelium is created?
Dental tissues fully mineralize to their mature levels.
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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
As a result of the apposition of cementum over dentin

13. In the cap stage the tooth bud does not grow - what happens?
Future dentin and pulp tissue
The enamel organ - dental papilla - dental sac
Alveolar bone
There is unequal growth in different parts of the tooth bud

14. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
When the gingiva recedes and no actual tooth movement takes place
Odontoblastic process
Dental papilla
Traumatic injury or crowding of teeth

15. What are the incremental lines for cementum and alveolar bone?
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
Proliferation - differentiation - morphogenesis
Arrest and reversal lines
The enamel organ - dental papilla - dental sac

16. What are the etiological factors of concrescence?
Arrest and reversal lines
Preameloblasts
Traumatic injury or crowding of teeth
Cementoblasts

17. What is cementogenisis?
The actual vertical movement of the tooth
The dental sac
Apposition of the cementum
Abnormally small teeth

18. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The basement membrane
Alveolar bone

19. What are the clinical ramifications of dens in dente?
Abnormally large teeth
Absence of single or multiple teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementocytes

20. What is macrodontia?
Sphere of enamel on root
Faulty development of enamel from interference involving ameloblasts
Abnormally large teeth
The actual vertical movement of the tooth

21. What are the etiological factors for fusion?
Differentiation
Pressure on the area
Into odontoblasts
When the gingiva recedes and no actual tooth movement takes place

22. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
The ectoderm
Cuboidal cells
A bilayer rim that consists only IEE and OEE

23. What stage does supernumerary teeth occur?
Abnormally small teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Differentiation
Initiation

24. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Odontoblasts
Ameloblasts
May be confused as calculus deposit on root

25. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Only dentinal tubules with processes
The primordium of the pulp
Dens in dente - gemination - tubercle - and fusion

26. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Extra cusp due to effects on enamel organ
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
The basement membrane

27. What happens during the appositional stage?
The permanent molars
Development of one or more extra teeth
Enamel organ invaginates into the dental papilla
The enamel - dentin - and cementum are secreted in successive layers

28. Tooth development
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
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.
Odontogenesis
Dens in dente - gemination - tubercle - and fusion

29. What are the developmental disturbances of the cap stage?
The enamel - dentin - and cementum are secreted in successive layers
Dens in dente - gemination - tubercle - and fusion
The ectomesenchyme - which was influenced by the neural crest cells
The enamel organ is compressed

30. What are the etiological factors of tubercle?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Trauma - pressure or metabolic disease
Local or systemic or hereditary
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

31. What are the cell layers found in the enamel organ in the bell stage?
8th week
There are none - they are lost with eruption
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental papilla

32. What is microdontia?
Cuboidal cells
Abnormally small teeth
Enamel secreting cells (ameloblasts)
Cementoblasts

33. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
May be confused as calculus deposit on root
Tooth germ
Local or systemic or hereditary

34. What is the time span for initiation?
Hereditary
Displacement of ameloblasts to root surface
Dental papilla
6th to 7th weeks

35. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel pearl - enamel dysplasia - and concresence
Preameloblasts
Tall columnar cells
The enamel organ

36. What is matrix?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementocytes
Tooth germ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

37. What is the function of the Hertwig's epithelial root sheath?
Initiation stage
Enamel pearl - enamel dysplasia - and concresence
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.
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

38. When does the process of root development take place?
Dental follicle
The ameloblasts place an acellular dental cuticle on the new enamel surface
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Common with permanent maxillary molars

39. When does dens in dente occur?
During the cap stage
The primordium of the pulp
Alveolar bone
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

40. What are the major components of the tooth germ?
The ectoderm
The enamel organ - dental papilla - dental sac
Development of one or more extra teeth
8th week

41. What will the inner cells of the dental lamina differentiates into?
The enamel organ is compressed
Odontoblasts
Bud stage
The primordium of the pulp

42. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
Imbrication lines of von Ebner
The ectomesenchyme
Lines of Retzuis

43. What is the embryological background for enamel?
Dens in dente - gemination - tubercle - and fusion
Enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

44. What is another name for the dental sac?
Odontoblastic process
Lines of Retzuis
Dental follicle
The cementum - PDL - and alveolar bone

45. What hard tissue has vascularity?
Odontoblastic process
Abnormally large teeth
Faulty development of enamel from interference involving ameloblasts
Alveolar bone

46. What are entrapped cementoblasts called?
Pressure on the area
Cementocytes
May be confused as calculus deposit on root
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

47. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ectomesenchyme - which was influenced by the neural crest cells
Displacement of ameloblasts to root surface
Compressed layer of flat to cuboidal cells

48. Where is the enamal organ originally derived from?
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.
Inner
The ectoderm
Preameloblasts

49. What type of tissue is enamel?
Common with permanent maxillary molars
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Epithelial
Enamel secreting cells (ameloblasts)

50. What else undergoes proliferation in the bud stage besides the dental lamina?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ectomesenchyme
Cementocytes
Dentin secreting cells (odontoblats)