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 kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Cementocytes
Tooth germ tries to divide
The stellate reticulum

2. What are the etiological factors for anodontia?
Bud stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The basement membrane
Tooth germ

3. What happens during initiation?
Differentiation - proliferation - morphogenesis
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Abnormally large teeth
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 happens to the thickened non tooth producing portions of the dental lamina eventually?
The enamel - dentin - and cementum are secreted in successive layers
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The permanent molars
It disintegrates as the developing oral mucosa comes to line the oral cavity

5. What is the embryological background for enamel?
Dental papilla
Common with permanent maxillary molars
Enamel
Enamel organ

6. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Ameloblasts
Union of root structure of two or more teeth by cementum
Into odontoblasts

7. What happens during the cap stage?
A mineralized cylinder - the dentinal tubule
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.
The ectoderm
Abnormally small teeth

8. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
There are none - they are lost with eruption
Cementoblasts
The bud stage
The ectomesenchyme

9. What are the mature cells for alveolar bone?
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
Osteocytes
The ectomesenchyme
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

10. What happens during the apposition stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dental tissues secreted as matrix in successive layers.
Epithelial
Dental papilla

11. What type of tissue is enamel?
Epithelial
Odontoblastic process
Only dentinal tubules with processes
The permanent molars

12. What are the etiological factors for dens in dente and gemination?
Maturation
Cementoblasts
Hereditary
The apposition of the enamel matrix

13. What are the clinical ramifications of concrescence?
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
Common with permanent maxillary molars
Cementoid
The ameloblasts place an acellular dental cuticle on the new enamel surface

14. What hard tissue has vascularity?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Alveolar bone
Osteocytes
In the cap stage

15. What are supernumerary teeth?
Development of one or more extra teeth
There are none - they are lost with eruption
The apposition of the enamel matrix
Proliferation - differentiation - morphogenesis

16. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Local or systemic or hereditary
Compressed layer of flat to cuboidal cells
Enamel

17. What are the clinical ramifications of enamel pearl?
Bud stage
The stellate reticulum
11th to 12th weeks
May be confused as calculus deposit on root

18. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel secreting cells (ameloblasts)
Dens in dente - gemination - tubercle - and fusion
Enamel

19. When does dens in dente occur?
Dens in dente - gemination - tubercle - and fusion
Initiation
Local or systemic or hereditary
During the cap stage

20. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The basement membrane
Cementocytes
The ameloblasts
The basement membrane that seperates the enamel organ and dental papilla

21. What is the site for the future dentioenamel junction?
Hereditary
The basement membrane that seperates the enamel organ and dental papilla
May be confused as calculus deposit on root
Into odontoblasts

22. The preameloblasts induce dental papilla cells to differentiate into what?
6th to 7th weeks
Into odontoblasts
Enamel organ invaginates into the dental papilla
Dental tissues fully mineralize to their mature levels.

23. What is macrodontia?
Absence of single or multiple teeth
A mineralized cylinder - the dentinal tubule
Abnormally large teeth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

24. The stratum intermediate is located inner or outer?
Enamel organ invaginates into the dental papilla
Inner
The stellate reticulum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

25. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
9th to 10th weeks
Dental papilla
Sphere of enamel on root
8th week

26. When does the tooth bud become a tooth germ?
Hereditary
In the cap stage
Dentin and alveolar bone
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.

27. What are the etiological factors of enamel dysplasia?
Extra cusp due to effects on enamel organ
Local or systemic or hereditary
The cervical loop
Maturation

28. What is tubercle?
Extra cusp due to effects on enamel organ
6th to 7th weeks
Dental tissues fully mineralize to their mature levels.
Abnormally large teeth

29. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Compressed layer of flat to cuboidal cells
Extra cusp due to effects on enamel organ
The primordium of the pulp

30. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Ameloblasts
Tall columnar cells
As a result of the apposition of cementum over dentin
The basement membrane

31. What is the embryological background for dentin - cementum and alveolar bone?
Abnormally small teeth
Dental papilla
The ectoderm
Enamel organ invaginates into the dental papilla

32. What are the major components of the tooth germ?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Future dentin and pulp tissue
The enamel organ - dental papilla - dental sac
There is unequal growth in different parts of the tooth bud

33. The stellate reticulum is located inner or outer?
A bilayer rim that consists only IEE and OEE
Local or systemic or hereditary
Maturation
Outer

34. How is the dentinocemental junction formed?
Hereditary
Tooth germ
The tooth germ
As a result of the apposition of cementum over dentin

35. What is dens in dente?
Ameloblasts
Enamel organ invaginates into the dental papilla
May be confused as calculus deposit on root
8th week

36. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Odontoclasts
Cementocytes
The basement membrane

37. What are the etiological factors for enamel pearl?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Ameloblasts
Displacement of ameloblasts to root surface
The primordium of the pulp

38. Where does the primordium of the permanent dentition develop?
Trauma - pressure or metabolic disease
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Initiation

39. What happens during the bud stage?
Lines of Retzuis
Osteocytes
It disintegrates as the developing oral mucosa comes to line the oral cavity
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

40. What are the mature cells for dentin?
Cementocytes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The basement membrane that seperates the enamel organ and dental papilla
Only dentinal tubules with processes

41. Do odontoblasts start their secretion of matrix before the ameloblasts?
The ectomesenchyme
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
As a result of the apposition of cementum over dentin
The enamel organ

42. Where is the enamal organ originally derived from?
The ectoderm
In the cap stage
Cementoid
Osteocytes

43. What are the development disturbances of the apposition and maturation stages?
Epithelial
Hereditary in localized form. endocrine dysfunction is complete
Displacement of ameloblasts to root surface
Enamel pearl - enamel dysplasia - and concresence

44. What wll the inner enamel epithelium differentiate into?
Odontoclasts
Tall columnar cells
Enamel secreting cells (ameloblasts)
The basement membrane

45. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Initiation stage
Odontoclasts
There are none - they are lost with eruption
The primordium of the pulp

46. When does macro/microdontia occur?
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
Apposition of the cementum
Bud stage
Local or systemic or hereditary

47. What processes are involved in the bell stage?
The dental lamina
Hereditary
Induction - proliferation
Differentiation - proliferation - morphogenesis

48. What is gemination?
Tooth germ tries to divide
Odontoblasts
Imbrication lines of von Ebner
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

49. 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

50. What is anodontia?
Cementocytes
Absence of single or multiple teeth
Cementoid
Trauma - pressure or metabolic disease