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 happens during initiation?
Ameloblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

2. When does the tooth bud become a tooth germ?
Cementoid
Into odontoblasts
In the cap stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

3. What is the cementum matrix called?
Cementoid
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
Local or systemic or hereditary
Epithelial rests of Malassez

4. What is gemination?
Hereditary
There are none - they are lost with eruption
Tall columnar cells
Tooth germ tries to divide

5. What are the formative cells for dentin?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Odontogenesis
Odontoblasts
The ectomesenchyme

6. Where does the primordium of the permanent dentition develop?
Into odontoblasts
Osteocytes
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The cervical loop

7. What are the etiological factors for dens in dente and gemination?
11th to 12th weeks
The outer cells of the dental papilla and the central cells of the dental papilla
May be confused as calculus deposit on root
Hereditary

8. What hard tissue is can not have tissue formation after eruption?
Induction - proliferation
Sphere of enamel on root
Enamel
Dental follicle

9. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Induction - proliferation
Induction

10. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Initiation stage
The bud stage
Cementoblasts
The basement membrane that seperates the enamel organ and dental papilla

11. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Union of 2 adjacent tooth germs
Outer

12. What kind of cells reside in the stratum intermediate?
The enamel organ - dental papilla - dental sac
Dental follicle
Compressed layer of flat to cuboidal cells
Traumatic injury or crowding of teeth

13. What stage does supernumerary teeth occur?
9th to 10th weeks
Initiation
Lines of Retzuis
Connective

14. When does the process of root development take place?
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The primordium of the pulp
Enamel pearl - enamel dysplasia - and concresence

15. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
The outer cells of the dental papilla and the central cells of the dental papilla
Cementoblasts
Development of one or more extra teeth

16. What are the clinical ramifications of anodontia?
Hereditary in localized form. endocrine dysfunction is complete
The actual vertical movement of the tooth
9th to 10th weeks
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

17. What are supernumerary teeth?
Cementoblasts
Enamel organ invaginates into the dental papilla
Development of one or more extra teeth
Only dentinal tubules with processes

18. Which layer in the bell stage has star shaped cells?
Tooth germ
Compressed layer of flat to cuboidal cells
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The stellate reticulum

19. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Proliferation
Commonly involves permanent maxillary lateral incisor and 3rd molars
There are none - they are lost with eruption

20. What hard tissue is innervated by nerves?
11th to 12th weeks
The basement membrane
Dentin and alveolar bone
Arrest and reversal lines

21. What is dens in dente?
The outer cells of the dental papilla and the central cells of the dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel organ invaginates into the dental papilla

22. What is amelogenisis?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The apposition of the enamel matrix
Maturation
Hereditary in localized form. endocrine dysfunction is complete

23. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
4 types
Tooth germ tries to divide
Hereditary in localized form. endocrine dysfunction is complete

24. What is the process involved in the maturation stage?
Cementoblasts
Maturation
Dental papilla
Union of 2 adjacent tooth germs

25. What are the developmental disturbances of the cap stage?
Local or systemic or hereditary
Dens in dente - gemination - tubercle - and fusion
Abnormally small teeth
Enamel organ

26. What are the clinical ramifications of fusion?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The stellate reticulum
Ameloblasts

27. What are the etiological factors for enamel pearl?
Compressed layer of flat to cuboidal cells
Only dentinal tubules with processes
Displacement of ameloblasts to root surface
It disintegrates as the developing oral mucosa comes to line the oral cavity

28. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
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
The basement membrane
Cementoblasts
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.

29. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The apposition of the enamel matrix
Abnormally small teeth
Hereditary
Dental papilla

30. What happens during the apposition stage?
Epithelial rests of Malassez
Dental tissues secreted as matrix in successive layers.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

31. Which teeth are nonsuccedaneous?
The ectomesenchyme
11th to 12th weeks
The permanent molars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

32. What is another name for the dental sac?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Initiation stage
Dental follicle
The stellate reticulum

33. What kind of cells occur in the outer enamel epithelium in the bell stage?
Traumatic injury or crowding of teeth
The basement membrane
Cuboidal cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

34. What is the cap in the cap stage?
In the cap stage
The enamel organ
The actual vertical movement of the tooth
The basement membrane

35. Where is the dental sac originally derived from?
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 ectomesenchyme
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Initiation

36. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The outer cells of the dental papilla and the central cells of the dental papilla
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane that seperates the enamel organ and dental papilla

37. The stellate reticulum is located inner or outer?
Induction - proliferation
Hereditary
Outer
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

38. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
The dental lamina
The outer enamel epithelium
The outer cells of the dental papilla and the central cells of the dental papilla

39. What are the etiological factors of enamel dysplasia?
The cementum - PDL - and alveolar bone
Cementoblasts
Local or systemic or hereditary
Oral epithelium

40. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Cementoblasts
Tooth germ
The bud stage

41. What type of tissue is dentin - cementum - and alveolar bone?
The basement membrane
Connective
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dentin and alveolar bone

42. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
The dental lamina
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
Cementocytes

43. What are the etiological factors for supernumerary teeth?
Proliferation - differentiation - morphogenesis
Hereditary
Common on permanent molars or cingulum of anterior teeth
The ameloblasts

44. What are the clinical ramifications of enamel dysplasia?
Development of one or more extra teeth
9th to 10th weeks
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

45. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
A bilayer rim that consists only IEE and OEE
8th week
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

46. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The dental lamina
Sphere of enamel on root
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

47. What is the main process involved in the bud stage?
Proliferation
Enamel
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The dental lamina

48. What are the clinical ramifications of supernumerary teeth?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Maturation
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 ameloblasts place an acellular dental cuticle on the new enamel surface

49. What are the clinical ramifications of gemination?

50. Where is the enamal organ originally derived from?
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
The ectoderm
Dentin secreting cells (odontoblats)
The ectomesenchyme - which was influenced by the neural crest cells