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 resorptive cells for enamel - dentin - cementum and alveolar bone?
The primordium of the pulp
Union of 2 adjacent tooth germs
Odontoclasts
There are none - they are lost with eruption

2. What are the incremental lines for cementum and alveolar bone?
The ectoderm
Preameloblasts
The bud stage
Arrest and reversal lines

3. What happens during the maturation stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental tissues fully mineralize to their mature levels.
Dental follicle
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

4. What are the clinical ramifications of fusion?
Osteoblasts
Abnormally large teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The cervical loop

5. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
The cervical loop
The basement membrane
The actual vertical movement of the tooth

6. What is matrix?
11th to 12th weeks
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Induction
Imbrication lines of von Ebner

7. What are the development disturbances of the apposition and maturation stages?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dental follicle
Hereditary in localized form. endocrine dysfunction is complete
Enamel pearl - enamel dysplasia - and concresence

8. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Abnormally small teeth
The ectomesenchyme
Displacement of ameloblasts to root surface

9. What is the time span for initiation?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
6th to 7th weeks
Union of root structure of two or more teeth by cementum
Absence of single or multiple teeth

10. What is gemination?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ tries to divide
Only dentinal tubules with processes
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

11. When does dens in dente occur?
Arrest and reversal lines
Proliferation
Dental follicle
During the cap stage

12. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Local or systemic or hereditary
Preameloblasts
Epithelial
Traumatic injury or crowding of teeth

13. What hard tissue is innervated by nerves?
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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dentin and alveolar bone
Development of one or more extra teeth

14. What are the etiological factors for micro/macrodontia?
Initiation stage
Hereditary in localized form. endocrine dysfunction is complete
Enamel secreting cells (ameloblasts)
Into odontoblasts

15. What are the clinical ramifications of dens in dente?
Absence of single or multiple teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Proliferation - differentiation - morphogenesis
Into odontoblasts

16. What are the cell layers found in the enamel organ in the bell stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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

17. What happens during the apposition stage?
11th to 12th weeks
Enamel pearl - enamel dysplasia - and concresence
Dental tissues secreted as matrix in successive layers.
Lines of Retzuis

18. What happens during initiation?
Maturation
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
Cuboidal cells
Enamel pearl - enamel dysplasia - and concresence

19. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Cementoblasts
May be confused as calculus deposit on root
Odontoblastic process

20. What are the clinical ramifications of supernumerary teeth?
Inner
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Oral epithelium
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

21. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
8th week
Proliferation
Induction
The dental sac

22. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Only dentinal tubules with processes
Dental papilla
The bud stage
Abnormally large teeth

23. How is the reduced enamel epithelium created?
Apposition of the cementum
The enamel - dentin - and cementum are secreted in successive layers
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The enamel organ is compressed

24. What happens during the bud stage?
4 types
Hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
8th week

25. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementoblasts
Hereditary

26. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Epithelial rests of Malassez
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Tooth germ
The actual vertical movement of the tooth

27. What are the incremental lines for enamel?
Union of 2 adjacent tooth germs
Future dentin and pulp tissue
Alveolar bone
Lines of Retzuis

28. How many types of cells are found in the enamel organ in the bell stage?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Induction
Dentin secreting cells (odontoblats)
4 types

29. What are the formative cells for enamel?
The ectomesenchyme
Ameloblasts
A bilayer rim that consists only IEE and OEE
Abnormally large teeth

30. What are the mature cells for dentin?
Only dentinal tubules with processes
Proliferation - differentiation - morphogenesis
There are none - they are lost with eruption
Faulty development of enamel from interference involving ameloblasts

31. Which layer in the bell stage has star shaped cells?
Connective
Dental papilla
The stellate reticulum
Odontoblasts

32. What is tubercle?
The cementum - PDL - and alveolar bone
Union of root structure of two or more teeth by cementum
Tall columnar cells
Extra cusp due to effects on enamel organ

33. What layer serves as protection for the enamel organ?
Tooth germ
The outer enamel epithelium
Tall columnar cells
Ameloblasts

34. What are the etiological factors of enamel dysplasia?
Abnormally small teeth
Local or systemic or hereditary
The basement membrane that seperates the enamel organ and dental papilla
Outer

35. Active eruption
Lines of Retzuis
Enamel organ invaginates into the dental papilla
Osteoblasts
The actual vertical movement of the tooth

36. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
The ectomesenchyme - which was influenced by the neural crest cells
Future dentin and pulp tissue
Dental papilla

37. What are the formative cells for dentin?
Dental papilla
The enamel organ - dental papilla - dental sac
Dental papilla
Odontoblasts

38. What are the developmental disturbances of the cap stage?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Oral epithelium
Dens in dente - gemination - tubercle - and fusion
Cementoblasts

39. What is the main process involved in initiation?
Outer
Dens in dente - gemination - tubercle - and fusion
Hereditary
Induction

40. When does the tooth bud become a tooth germ?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Osteoblasts
Dentin and alveolar bone
In the cap stage

41. What is concrescence?
The ectoderm
May be confused as calculus deposit on root
Abnormally large teeth
Union of root structure of two or more teeth by cementum

42. What will the dental papilla eventually form?
The bud stage
Epithelial rests of Malassez
Future dentin and pulp tissue
A bilayer rim that consists only IEE and OEE

43. Where is the dental papilla originally derived from?
Differentiation - proliferation - morphogenesis
8th week
The ectomesenchyme - which was influenced by the neural crest cells
A mineralized cylinder - the dentinal tubule

44. What are the etiological factors for fusion?
The cementum - PDL - and alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Pressure on the area
Absence of single or multiple teeth

45. What is an enamel pearl?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Sphere of enamel on root
May be confused as calculus deposit on root
Enamel organ invaginates into the dental papilla

46. Where is the enamal organ originally derived from?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Epithelial rests of Malassez
The ectoderm
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

47. The preameloblasts induce dental papilla cells to differentiate into what?
Initiation stage
Into odontoblasts
Cementoblasts
The outer enamel epithelium

48. What is the time span for the bud stage?
The cementum - PDL - and alveolar bone
The dental sac
8th week
The basement membrane

49. What will the dental sac give rise to?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The cementum - PDL - and alveolar bone
The enamel organ is compressed
The stellate reticulum

50. 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
Odontoblasts
Dens in dente - gemination - tubercle - and fusion
May be confused as calculus deposit on root