Test your basic knowledge |

Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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?
Cementocytes
Tooth germ tries to divide
Enamel pearl - enamel dysplasia - and concresence
Sphere of enamel on root

2. What happens during initiation?
The basement membrane that seperates the enamel organ and dental papilla
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
Abnormally large teeth
The ectomesenchyme

3. Where is the dental papilla originally derived from?
The cementum - PDL - and alveolar bone
The ectomesenchyme - which was influenced by the neural crest cells
Induction
Compressed layer of flat to cuboidal cells

4. What are the mature cells for cementum?
The basement membrane
Odontoblasts
Cementocytes
Odontogenesis

5. What is the main process involved in the bud stage?
A bilayer rim that consists only IEE and OEE
Inner
Proliferation
Absence of single or multiple teeth

6. What are the clinical ramifications of supernumerary teeth?
Traumatic injury or crowding of teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dental papilla

7. What hard tissue is can not have tissue formation after eruption?
Hereditary
Enamel
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
A mineralized cylinder - the dentinal tubule

8. What is the predominate process in the bell stage?
Differentiation
9th to 10th weeks
A mineralized cylinder - the dentinal tubule
The apposition of the enamel matrix

9. What are the etiological factors for supernumerary teeth?
Enamel secreting cells (ameloblasts)
Hereditary
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Commonly involves permanent maxillary lateral incisor and 3rd molars

10. When does macro/microdontia occur?
Bud stage
Initiation stage
The ectomesenchyme - which was influenced by the neural crest cells
Outer

11. What hard tissue is innervated by nerves?
Enamel organ
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
Dentin and alveolar bone
Future dentin and pulp tissue

12. What type of tissue is enamel?
Union of 2 adjacent tooth germs
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Epithelial
Commonly involves permanent maxillary lateral incisor and 3rd molars

13. What processes are involved in the bell stage?
Cementoblasts
Differentiation - proliferation - morphogenesis
Enamel secreting cells (ameloblasts)
Dentin secreting cells (odontoblats)

14. What are supernumerary teeth?
Development of one or more extra teeth
Abnormally small teeth
Imbrication lines of von Ebner
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

15. What are the etiological factors for anodontia?
Local or systemic or hereditary
The basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementoblasts

16. Which layer in the bell stage has star shaped cells?
Compressed layer of flat to cuboidal cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Morphogenesis
The stellate reticulum

17. Where is the enamal organ originally derived from?
Common with permanent maxillary molars
Cementocytes
The ectoderm
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

18. What are the incremental lines for cementum and alveolar bone?
Trauma - pressure or metabolic disease
Epithelial
Arrest and reversal lines
Proliferation - differentiation - morphogenesis

19. What are the development disturbances of the apposition and maturation stages?
Dental papilla
Dentin secreting cells (odontoblats)
The ectoderm
Enamel pearl - enamel dysplasia - and concresence

20. What are the clinical ramifications of gemination?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

21. What happens during the maturation stage?
The dental lamina
Dental tissues fully mineralize to their mature levels.
Enamel organ
The bud stage

22. What are the mature cells for alveolar bone?
The actual vertical movement of the tooth
When the gingiva recedes and no actual tooth movement takes place
Osteocytes
The basement membrane

23. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
The apposition of the enamel matrix
Outer
As a result of the apposition of cementum over dentin

24. What layer serves as protection for the enamel organ?
The ameloblasts
In the cap stage
Lines of Retzuis
The outer enamel epithelium

25. What is the time span for initiation?
A bilayer rim that consists only IEE and OEE
The basement membrane
6th to 7th weeks
Enamel secreting cells (ameloblasts)

26. What happens during the bell stage?
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
9th to 10th weeks
6th to 7th weeks
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

27. The preameloblasts induce dental papilla cells to differentiate into what?
Epithelial rests of Malassez
Into odontoblasts
The dental lamina
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

28. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Induction - proliferation
Hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

29. What are the odontoblastic processes is contained in what?
8th week
Osteocytes
The enamel organ
A mineralized cylinder - the dentinal tubule

30. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Inner
The apposition of the enamel matrix
The ameloblasts
Epithelial

31. What is the outer portion of the ectoderm in the initiation stage?
Common with permanent maxillary molars
Oral epithelium
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
8th week

32. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The apposition of the enamel matrix
The basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity
The bud stage

33. What is tubercle?
Maturation
Extra cusp due to effects on enamel organ
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
Compressed layer of flat to cuboidal cells

34. What is macrodontia?
The dental lamina
Abnormally large teeth
Displacement of ameloblasts to root surface
Tooth germ

35. What is the embryological background for dentin - cementum and alveolar bone?
During the cap stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Bud stage
Dental papilla

36. Where is the dental sac originally derived from?
The ectomesenchyme
The ectomesenchyme - which was influenced by the neural crest cells
Oral epithelium
The cementum - PDL - and alveolar bone

37. What is concrescence?
Union of root structure of two or more teeth by cementum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Inner
Epithelial

38. What will the dental papilla eventually form?
Future dentin and pulp tissue
Dental follicle
Compressed layer of flat to cuboidal cells
The basement membrane that seperates the enamel organ and dental papilla

39. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Displacement of ameloblasts to root surface
Cementoblasts
Traumatic injury or crowding of teeth
Alveolar bone

40. What are the etiological factors for enamel pearl?
Enamel organ
Outer
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Displacement of ameloblasts to root surface

41. What does the cervical loop consist of?
9th to 10th weeks
A bilayer rim that consists only IEE and OEE
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Enamel organ invaginates into the dental papilla

42. How is the reduced enamel epithelium created?
The enamel organ is compressed
Into odontoblasts
Displacement of ameloblasts to root surface
Hereditary in localized form. endocrine dysfunction is complete

43. What are the clinical ramifications of enamel pearl?
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.
Dental papilla
May be confused as calculus deposit on root

44. What are the processes involved in the cap stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The permanent molars
Proliferation - differentiation - morphogenesis
Enamel organ invaginates into the dental papilla

45. What happens during the appositional stage?
Inner
Tooth germ
Absence of single or multiple teeth
The enamel - dentin - and cementum are secreted in successive layers

46. In the cap stage the tooth bud does not grow - what happens?
Proliferation
11th to 12th weeks
There is unequal growth in different parts of the tooth bud
Development of one or more extra teeth

47. What is the cementum matrix called?
Imbrication lines of von Ebner
Cementoid
Osteocytes
Traumatic injury or crowding of teeth

48. What are the etiological factors for dens in dente and gemination?
Hereditary
Absence of single or multiple teeth
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
Apposition of the cementum

49. What are the etiological factors of concrescence?
The actual vertical movement of the tooth
The stellate reticulum
Traumatic injury or crowding of teeth
Only dentinal tubules with processes

50. What is the predominate process of the cap stage?
Enamel pearl - enamel dysplasia - and concresence
Into odontoblasts
Lines of Retzuis
Morphogenesis