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 are the incremental lines for cementum and alveolar bone?
Traumatic injury or crowding of teeth
Induction - proliferation
The tooth germ
Arrest and reversal lines

2. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The primordium of the pulp
Cementoblasts
There is unequal growth in different parts of the tooth bud

3. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
A bilayer rim that consists only IEE and OEE
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Union of root structure of two or more teeth by cementum

4. What are the etiological factors for supernumerary teeth?
Hereditary
The apposition of the enamel matrix
Differentiation
As a result of the apposition of cementum over dentin

5. What type of tissue is dentin - cementum - and alveolar bone?
Only dentinal tubules with processes
Proliferation - differentiation - morphogenesis
Connective
Odontoblasts

6. The stellate reticulum is located inner or outer?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel organ is compressed
Only dentinal tubules with processes
Outer

7. What hard tissue is innervated by nerves?
Enamel organ invaginates into the dental papilla
Traumatic injury or crowding of teeth
Dentin and alveolar bone
Maturation

8. What is the time span for the bud stage?
Dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars
Imbrication lines of von Ebner
8th week

9. The preameloblasts induce dental papilla cells to differentiate into what?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally large teeth
The enamel organ - dental papilla - dental sac
Into odontoblasts

10. What hard tissue is can not have tissue formation after eruption?
The enamel organ is compressed
Enamel
Commonly involves permanent maxillary lateral incisor and 3rd molars
Maturation

11. What are the mature cells for cementum?
Sphere of enamel on root
Cementocytes
Arrest and reversal lines
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

12. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
The ectoderm
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Faulty development of enamel from interference involving ameloblasts

13. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Preameloblasts
Odontoclasts

14. What is tubercle?
Faulty development of enamel from interference involving ameloblasts
Dental papilla
Extra cusp due to effects on enamel organ
Ameloblasts

15. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
The enamel organ - dental papilla - dental sac
Imbrication lines of von Ebner
The tooth germ

16. Where is the dental sac originally derived from?
Cementocytes
The ectomesenchyme
Displacement of ameloblasts to root surface
The stellate reticulum

17. What is the cementum matrix called?
Cementoid
Common with permanent maxillary molars
9th to 10th weeks
Outer

18. What are the etiological factors for anodontia?
The basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
It disintegrates as the developing oral mucosa comes to line the oral cavity
Sphere of enamel on root

19. Which layer in the bell stage has star shaped cells?
8th week
Ameloblasts
The stellate reticulum
It disintegrates as the developing oral mucosa comes to line the oral cavity

20. What are supernumerary teeth?
Union of 2 adjacent tooth germs
8th week
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

21. Where is the enamal organ originally derived from?
Bud stage
Extra cusp due to effects on enamel organ
The ectoderm
The basement membrane

22. What else undergoes proliferation in the bud stage besides the dental lamina?
Enamel organ invaginates into the dental papilla
There are none - they are lost with eruption
The ectomesenchyme
Odontogenesis

23. What is dens in dente?
Union of root structure of two or more teeth by cementum
Enamel organ invaginates into the dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
A mineralized cylinder - the dentinal tubule

24. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The cementum - PDL - and alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Odontoclasts
Enamel secreting cells (ameloblasts)

25. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The dental sac
Hereditary
Enamel secreting cells (ameloblasts)

26. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
A bilayer rim that consists only IEE and OEE
Tooth germ tries to divide

27. Passive eruption
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
When the gingiva recedes and no actual tooth movement takes place
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
As a result of the apposition of cementum over dentin

28. What are the etiological factors for enamel pearl?
The permanent molars
Union of 2 adjacent tooth germs
A bilayer rim that consists only IEE and OEE
Displacement of ameloblasts to root surface

29. What is the main process involved in initiation?
Induction
Into odontoblasts
Pressure on the area
Connective

30. What are the processes involved in the cap stage?
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 enamel - dentin - and cementum are secreted in successive layers
Proliferation - differentiation - morphogenesis
In the cap stage

31. What is another name for the dental sac?
Dental follicle
Initiation stage
A mineralized cylinder - the dentinal tubule
Union of root structure of two or more teeth by cementum

32. What happens during the cap stage?
The ectomesenchyme - which was influenced by the neural crest cells
Enamel organ
4 types
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.

33. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Dental tissues fully mineralize to their mature levels.
Cementoid
Epithelial

34. How is the reduced enamel epithelium created?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Enamel pearl - enamel dysplasia - and concresence
The enamel organ is compressed
Hereditary in localized form. endocrine dysfunction is complete

35. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Enamel organ invaginates into the dental papilla
9th to 10th weeks
Cementoblasts

36. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
A bilayer rim that consists only IEE and OEE
The basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

37. What is an enamel pearl?
Sphere of enamel on root
Inner
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

38. What are the mature cells for enamel?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Morphogenesis
There are none - they are lost with eruption
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 are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
The basement membrane that seperates the enamel organ and dental papilla
The stellate reticulum
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

40. 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

41. What are the mature cells for alveolar bone?
Cementoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Osteocytes
8th week

42. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Odontogenesis
Imbrication lines of von Ebner
May be confused as calculus deposit on root

43. What is matrix?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dens in dente - gemination - tubercle - and fusion
Common on permanent molars or cingulum of anterior teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

44. What will the inner cells of the dental lamina differentiates into?
The enamel organ is compressed
The primordium of the pulp
May be confused as calculus deposit on root
Maturation

45. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Tall columnar cells
The apposition of the enamel matrix
Traumatic injury or crowding of teeth

46. What is gemination?
Tooth germ tries to divide
Epithelial
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Proliferation - differentiation - morphogenesis

47. What are the odontoblastic processes is contained in what?
Bud stage
A mineralized cylinder - the dentinal tubule
11th to 12th weeks
Epithelial

48. What are the development disturbances of the apposition and maturation stages?
The ectomesenchyme
Dental tissues secreted as matrix in successive layers.
Arrest and reversal lines
Enamel pearl - enamel dysplasia - and concresence

49. What are the mature cells for dentin?
Only dentinal tubules with processes
Induction
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The dental lamina

50. What is the cap in the cap stage?
The enamel organ
Dental papilla
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontogenesis