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 is anodontia?
Induction - proliferation
Commonly involves permanent maxillary lateral incisor and 3rd molars
Proliferation
Absence of single or multiple teeth

2. Do odontoblasts start their secretion of matrix before the ameloblasts?
The stellate reticulum
Osteoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Ameloblasts

3. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ameloblasts place an acellular dental cuticle on the new enamel surface
During the cap stage
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. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
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
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dental papilla

5. What stage does the dental tissues subsequently fully mineralize
The enamel organ is compressed
May be confused as calculus deposit on root
Maturation
Enamel secreting cells (ameloblasts)

6. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Dental follicle
Abnormally small teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

7. What stage does supernumerary teeth occur?
The basement membrane
9th to 10th weeks
Alveolar bone
Initiation

8. Which teeth are nonsuccedaneous?
Cuboidal cells
Lines of Retzuis
The permanent molars
Ameloblasts

9. What is the predominate process of the cap stage?
11th to 12th weeks
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Osteoblasts
Morphogenesis

10. What is the time span for the bud stage?
Odontogenesis
8th week
Differentiation - proliferation - morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

11. What are the etiological factors for fusion?
Extra cusp due to effects on enamel organ
Maturation
Pressure on the area
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

12. What are the development disturbances of the apposition and maturation stages?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The bud stage
Enamel pearl - enamel dysplasia - and concresence
Union of 2 adjacent tooth germs

13. What are the mature cells for enamel?
There are none - they are lost with eruption
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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.
8th week

14. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementoid
Preameloblasts
When the gingiva recedes and no actual tooth movement takes place

15. What are the clinical ramifications of enamel dysplasia?
Into odontoblasts
The enamel - dentin - and cementum are secreted in successive layers
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Tooth germ

16. What happens during the apposition stage?
Hereditary
Proliferation - differentiation - morphogenesis
Dental tissues secreted as matrix in successive layers.
Differentiation - proliferation - morphogenesis

17. What is amelogenisis?
The enamel organ is compressed
Abnormally large teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The apposition of the enamel matrix

18. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Cementoid
Induction
During the cap stage

19. The stellate reticulum is located inner or outer?
Tooth germ tries to divide
Osteocytes
Enamel secreting cells (ameloblasts)
Outer

20. What are the etiological factors for micro/macrodontia?
Proliferation
Hereditary in localized form. endocrine dysfunction is complete
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The ectoderm

21. What are the formative cells for alveolar bone?
Osteoblasts
Odontoclasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontogenesis

22. What are the mature cells for dentin?
Osteocytes
Cementoblasts
Only dentinal tubules with processes
Odontoclasts

23. What are the clinical ramifications of anodontia?
Odontogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

24. What happens when the reduced enamel epithelium is created?
Development of one or more extra teeth
Cementoblasts
The actual vertical movement of the tooth
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

25. What is the time span for the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
11th to 12th weeks
6th to 7th weeks

26. What is tubercle?
Inner
Cementoid
Extra cusp due to effects on enamel organ
Odontogenesis

27. What will the dental sac give rise to?
Proliferation
Compressed layer of flat to cuboidal cells
The cementum - PDL - and alveolar bone
Differentiation

28. What will the dental papilla eventually form?
Odontogenesis
Future dentin and pulp tissue
Induction - proliferation
Cementoblasts

29. What is the embryological background for dentin - cementum and alveolar bone?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Compressed layer of flat to cuboidal cells
Dental papilla
Absence of single or multiple teeth

30. What are the etiological factors for dens in dente and gemination?
Hereditary
Common with permanent maxillary molars
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 ameloblasts

31. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
The actual vertical movement of the tooth
Epithelial rests of Malassez
8th week

32. What happens during the cap stage?
Cementocytes
Hereditary in localized form. endocrine dysfunction is complete
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.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

33. Active eruption
Hereditary in localized form. endocrine dysfunction is complete
Trauma - pressure or metabolic disease
Odontogenesis
The actual vertical movement of the tooth

34. The stratum intermediate is located inner or outer?
Dens in dente - gemination - tubercle - and fusion
Inner
The cervical loop
It disintegrates as the developing oral mucosa comes to line the oral cavity

35. What processes are involved in the bell stage?
Dental papilla
Cementocytes
Differentiation - proliferation - morphogenesis
Maturation

36. What is the outer portion of the ectoderm in the initiation stage?
8th week
Oral epithelium
The actual vertical movement of the tooth
When the gingiva recedes and no actual tooth movement takes place

37. What are the etiological factors for supernumerary teeth?
Oral epithelium
Bud stage
Hereditary
The cementum - PDL - and alveolar bone

38. What are the clinical ramifications of supernumerary teeth?
Enamel pearl - enamel dysplasia - and concresence
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Tooth germ tries to divide
Outer

39. What is the cementum matrix called?
Cementocytes
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Maturation
Cementoid

40. What hard tissue is can not have tissue formation after eruption?
Enamel
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Imbrication lines of von Ebner
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

41. What is the process involved in the maturation stage?
Only dentinal tubules with processes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Oral epithelium
Maturation

42. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Local or systemic or hereditary
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Oral epithelium

43. What is the time span for initiation?
The ectomesenchyme
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
During the cap stage
6th to 7th weeks

44. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Local or systemic or hereditary
The ameloblasts
Proliferation - differentiation - morphogenesis
Dentin and alveolar bone

45. What are the cell layers found in the enamel organ in the bell stage?
Tooth germ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The apposition of the enamel matrix

46. What kind of cells occur in the outer enamel epithelium in the bell stage?
The enamel - dentin - and cementum are secreted in successive layers
Cuboidal cells
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
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

47. Where is the dental papilla originally derived from?
Sphere of enamel on root
Traumatic injury or crowding of teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The ectomesenchyme - which was influenced by the neural crest cells

48. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Common with permanent maxillary molars
Maturation
Odontoblastic process

49. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Cementoblasts
Imbrication lines of von Ebner
Induction - proliferation

50. 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