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 cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Common with permanent maxillary molars
Extra cusp due to effects on enamel organ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

2. Tooth development
Outer
6th to 7th weeks
Odontogenesis
Osteoblasts

3. What stage does supernumerary teeth occur?
In the cap stage
Abnormally large teeth
Initiation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

4. The preameloblasts induce dental papilla cells to differentiate into what?
Sphere of enamel on root
Proliferation
Enamel secreting cells (ameloblasts)
Into odontoblasts

5. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The basement membrane
Enamel secreting cells (ameloblasts)

6. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel - dentin - and cementum are secreted in successive layers
The bud stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

7. What are the formative cells for dentin?
Odontoblasts
Dental follicle
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
4 types

8. What are the etiological factors of enamel dysplasia?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel
Hereditary in localized form. endocrine dysfunction is complete
Local or systemic or hereditary

9. 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

10. When does dens in dente occur?
Dental tissues secreted as matrix in successive layers.
The permanent molars
The cementum - PDL - and alveolar bone
During the cap stage

11. 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 enamel organ is compressed
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Traumatic injury or crowding of teeth

12. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Faulty development of enamel from interference involving ameloblasts
May be confused as calculus deposit on root
The outer cells of the dental papilla and the central cells of the dental papilla
Cementoblasts

13. Which layer in the bell stage has star shaped cells?
Extra cusp due to effects on enamel organ
8th week
Odontogenesis
The stellate reticulum

14. What are the developmental disturbances of the cap stage?
Maturation
The ameloblasts
Dens in dente - gemination - tubercle - and fusion
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

15. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Arrest and reversal lines
Apposition of the cementum
Epithelial rests of Malassez

16. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Ameloblasts
The enamel organ - dental papilla - dental sac
Dentin and alveolar bone
Tooth germ

17. What does the cervical loop consist of?
The enamel organ
Trauma - pressure or metabolic disease
Compressed layer of flat to cuboidal cells
A bilayer rim that consists only IEE and OEE

18. What else undergoes proliferation in the bud stage besides the dental lamina?
Enamel organ invaginates into the dental papilla
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Cuboidal cells
The ectomesenchyme

19. When does the tooth bud become a tooth germ?
Oral epithelium
In the cap stage
Extra cusp due to effects on enamel organ
Development of one or more extra teeth

20. Active eruption
Connective
The actual vertical movement of the tooth
Dental tissues secreted as matrix in successive layers.
The primordium of the pulp

21. What is microdontia?
The ameloblasts
Hereditary
Abnormally small teeth
Cementoblasts

22. What are the clinical ramifications of anodontia?
Local or systemic or hereditary
When the gingiva recedes and no actual tooth movement takes place
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel organ

23. What stage does anodontia occur?
Preameloblasts
Tall columnar cells
May be confused as calculus deposit on root
Initiation stage

24. What is tubercle?
Extra cusp due to effects on enamel organ
Initiation stage
Hereditary
Preameloblasts

25. What processes are involved in the bell stage?
Dental papilla
Osteoblasts
Differentiation - proliferation - morphogenesis
Proliferation - differentiation - morphogenesis

26. What are entrapped cementoblasts called?
The cervical loop
Alveolar bone
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementocytes

27. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
A mineralized cylinder - the dentinal tubule
The bud stage
Odontogenesis
Union of 2 adjacent tooth germs

28. What kind of cells occur in the inner enamel epithelium?
The actual vertical movement of the tooth
9th to 10th weeks
Tall columnar cells
Union of root structure of two or more teeth by cementum

29. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementocytes
Maturation
Absence of single or multiple teeth

30. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Apposition of the cementum
When the gingiva recedes and no actual tooth movement takes place
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

31. What is dens in dente?
During the cap stage
Enamel organ invaginates into the dental papilla
A mineralized cylinder - the dentinal tubule
Hereditary

32. What happens when the reduced enamel epithelium is created?
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
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dental papilla
Connective

33. What is the primordium of the tooth?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The tooth germ
Epithelial
Bud stage

34. What happens during the cap stage?
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.
Dentin and alveolar bone
The actual vertical movement of the tooth
There is unequal growth in different parts of the tooth bud

35. What is the main process involved in initiation?
The dental sac
Induction
A mineralized cylinder - the dentinal tubule
The ectoderm

36. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dental tissues secreted as matrix in successive layers.
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementoid
It disintegrates as the developing oral mucosa comes to line the oral cavity

37. How many types of cells are found in the enamel organ in the bell stage?
Cementocytes
4 types
Outer
Tooth germ

38. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Hereditary
Extra cusp due to effects on enamel organ
Connective

39. What is the time span for initiation?
Tooth germ
The basement membrane
Traumatic injury or crowding of teeth
6th to 7th weeks

40. The oral epithelium is induced by the ectomesenchyme to produce what?
Preameloblasts
When the gingiva recedes and no actual tooth movement takes place
The dental lamina
Lines of Retzuis

41. What is the predominate process in the bell stage?
Oral epithelium
Differentiation
Abnormally large teeth
Epithelial rests of Malassez

42. What is macrodontia?
Abnormally large teeth
The ectoderm
Arrest and reversal lines
Alveolar bone

43. What happens during initiation?
Enamel organ
Future dentin and pulp tissue
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
Dentin secreting cells (odontoblats)

44. What happens during the apposition stage?
The cementum - PDL - and alveolar bone
Dental tissues secreted as matrix in successive layers.
Dentin and alveolar bone
The primordium of the pulp

45. Where is the dental papilla originally derived from?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme - which was influenced by the neural crest cells
Epithelial rests of Malassez
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

46. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dental papilla
The ectomesenchyme
Dentin secreting cells (odontoblats)

47. Do odontoblasts start their secretion of matrix before the ameloblasts?
There are none - they are lost with eruption
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ameloblasts place an acellular dental cuticle on the new enamel surface
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

48. What is the predominate process of the cap stage?
Morphogenesis
Cementocytes
Bud stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

49. What are the clinical ramifications of enamel dysplasia?
The permanent molars
Tall columnar cells
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary

50. What are the formative cells for enamel?
Induction - proliferation
Ameloblasts
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