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. Do odontoblasts start their secretion of matrix before the ameloblasts?
Inner
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dentin and alveolar bone
The basement membrane

2. When does the tooth bud become a tooth germ?
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
Differentiation - proliferation - morphogenesis
In the cap stage
Cuboidal cells

3. What are the mature cells for dentin?
Enamel pearl - enamel dysplasia - and concresence
Common on permanent molars or cingulum of anterior teeth
Only dentinal tubules with processes
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

4. What are the etiological factors for dens in dente and gemination?
The apposition of the enamel matrix
Enamel pearl - enamel dysplasia - and concresence
Enamel
Hereditary

5. What is the main process involved in initiation?
Induction
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Epithelial
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

6. What are the clinical ramifications of dens in dente?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

7. What is tubercle?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Extra cusp due to effects on enamel organ
Dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

8. How is the dentinocemental junction formed?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
9th to 10th weeks
Absence of single or multiple teeth
As a result of the apposition of cementum over dentin

9. What are the clinical ramifications of enamel pearl?
The primordium of the pulp
Initiation
May be confused as calculus deposit on root
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

10. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Odontogenesis
Dens in dente - gemination - tubercle - and fusion
The ameloblasts
Union of 2 adjacent tooth germs

11. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Lines of Retzuis
Initiation stage
The enamel organ is compressed

12. When does the process of root development take place?
Traumatic injury or crowding of teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The permanent molars
Proliferation

13. What are the cell layers found in the enamel organ in the bell stage?
The dental lamina
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel secreting cells (ameloblasts)
Outer

14. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Enamel pearl - enamel dysplasia - and concresence
Compressed layer of flat to cuboidal cells
Common with permanent maxillary molars

15. Passive eruption
The primordium of the pulp
Abnormally small teeth
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
When the gingiva recedes and no actual tooth movement takes place

16. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The apposition of the enamel matrix
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Sphere of enamel on root
It disintegrates as the developing oral mucosa comes to line the oral cavity

17. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Enamel organ invaginates into the dental papilla
9th to 10th weeks
Dental papilla
Epithelial

18. What are the formative cells for cementum?
Cementoblasts
Epithelial
Initiation
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

19. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Traumatic injury or crowding of teeth
Bud stage
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
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

20. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
It disintegrates as the developing oral mucosa comes to line the oral cavity
The actual vertical movement of the tooth
The enamel organ

21. What are entrapped cementoblasts called?
Cementocytes
The apposition of the enamel matrix
Common with permanent maxillary molars
May be confused as calculus deposit on root

22. The stratum intermediate is located inner or outer?
Initiation stage
Cuboidal cells
Traumatic injury or crowding of teeth
Inner

23. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Cementocytes
Odontoclasts
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

24. What are supernumerary teeth?
Tooth germ tries to divide
Hereditary in localized form. endocrine dysfunction is complete
Lines of Retzuis
Development of one or more extra teeth

25. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Preameloblasts
The outer cells of the dental papilla and the central cells of the dental papilla
Cementocytes

26. In the cap stage the tooth bud does not grow - what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Ameloblasts
There is unequal growth in different parts of the tooth bud
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

27. What is the cap in the cap stage?
The enamel organ - dental papilla - dental sac
Extra cusp due to effects on enamel organ
Common with permanent maxillary molars
The enamel organ

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

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

29. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Proliferation - differentiation - morphogenesis
Differentiation - proliferation - morphogenesis
Lines of Retzuis

30. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Absence of single or multiple teeth
The outer cells of the dental papilla and the central cells of the dental papilla

31. What processes are involved with the apposition stage?
Induction - proliferation
4 types
Extra cusp due to effects on enamel organ
Maturation

32. What are the mature cells for alveolar bone?
Osteocytes
The primordium of the pulp
The ectomesenchyme
The dental sac

33. What will the dental sac give rise to?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental tissues fully mineralize to their mature levels.
The cementum - PDL - and alveolar bone
Common with permanent maxillary molars

34. How many types of cells are found in the enamel organ in the bell stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The bud stage
The enamel organ - dental papilla - dental sac
4 types

35. What is the structure responsible for root development?
6th to 7th weeks
Local or systemic or hereditary
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop

36. What are the clinical ramifications of fusion?
Odontoblasts
Development of one or more extra teeth
The enamel organ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

37. What are the clinical ramifications of enamel dysplasia?
Dentin and alveolar bone
There are none - they are lost with eruption
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Common on permanent molars or cingulum of anterior teeth

38. What are the etiological factors for enamel pearl?
Lines of Retzuis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Alveolar bone
Displacement of ameloblasts to root surface

39. Where is the dental sac originally derived from?
The permanent molars
Odontoclasts
Proliferation
The ectomesenchyme

40. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Arrest and reversal lines
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tooth germ tries to divide
Epithelial rests of Malassez

41. What kind of cells occur in the inner enamel epithelium?
Induction - proliferation
Tall columnar cells
The basement membrane
Initiation

42. What are the etiological factors of concrescence?
Epithelial rests of Malassez
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Traumatic injury or crowding of teeth
Odontoblasts

43. What is the main process involved in the bud stage?
Proliferation
Union of root structure of two or more teeth by cementum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental sac

44. What is the predominate process in the bell stage?
Induction - proliferation
There is unequal growth in different parts of the tooth bud
Outer
Differentiation

45. What is matrix?
Odontogenesis
Cuboidal cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementoblasts

46. What type of tissue is enamel?
The ectomesenchyme - which was influenced by the neural crest cells
Epithelial
Induction - proliferation
The basement membrane

47. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Faulty development of enamel from interference involving ameloblasts
The basement membrane
Displacement of ameloblasts to root surface
The bud stage

48. What are succedaneous teeth?
Induction
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental lamina
Cementocytes

49. What hard tissue is can not have tissue formation after eruption?
Initiation stage
Enamel
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The outer cells of the dental papilla and the central cells of the dental papilla

50. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Odontoclasts
Dental tissues fully mineralize to their mature levels.
Enamel