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 do the odontoblasts do?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The cementum - PDL - and alveolar bone
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental sac

2. What is the site for the future dentioenamel junction?
Osteocytes
The basement membrane that seperates the enamel organ and dental papilla
The ectomesenchyme
The enamel organ

3. Tooth development
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ameloblasts
Odontogenesis
Cuboidal cells

4. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Dentin secreting cells (odontoblats)
A mineralized cylinder - the dentinal tubule
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

5. How is the reduced enamel epithelium created?
The enamel organ is compressed
Pressure on the area
Initiation stage
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

6. What are the etiological factors of enamel dysplasia?
The permanent molars
Tooth germ tries to divide
Local or systemic or hereditary
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

7. What are the incremental lines for dentin?
Enamel
Imbrication lines of von Ebner
The permanent molars
Tooth germ

8. What is the time span for the cap stage?
9th to 10th weeks
Differentiation
Tall columnar cells
Dentin secreting cells (odontoblats)

9. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The basement membrane
Inner
Odontoclasts
Local or systemic or hereditary

10. What are the mature cells for alveolar bone?
May be confused as calculus deposit on root
Outer
Development of one or more extra teeth
Osteocytes

11. What is the process involved in the maturation stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Maturation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
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

12. What type of tissue is dentin - cementum - and alveolar bone?
The permanent molars
The ectomesenchyme
Connective
Cementocytes

13. When does the process of root development take place?
Dental tissues secreted as matrix in successive layers.
The actual vertical movement of the tooth
Cementoblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

14. What hard tissue is can not have tissue formation after eruption?
The basement membrane that seperates the enamel organ and dental papilla
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel
Osteoblasts

15. Which teeth are nonsuccedaneous?
The permanent molars
The actual vertical movement of the tooth
Differentiation
The stellate reticulum

16. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
In the cap stage
A bilayer rim that consists only IEE and OEE
Proliferation - differentiation - morphogenesis
Tooth germ

17. What is the predominate process in the bell stage?
Connective
Proliferation
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Differentiation

18. What is anodontia?
Into odontoblasts
Maturation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Absence of single or multiple teeth

19. What is amelogenisis?
The apposition of the enamel matrix
Induction
Odontoclasts
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.

20. What layer serves as protection for the enamel organ?
The tooth germ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer enamel epithelium

21. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
9th to 10th weeks
Dentin and alveolar bone

22. What happens during the bud stage?
Maturation
The actual vertical movement of the tooth
The permanent molars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

23. 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
When the gingiva recedes and no actual tooth movement takes place
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
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

24. How is the dentinocemental junction formed?
The ectomesenchyme
Extra cusp due to effects on enamel organ
6th to 7th weeks
As a result of the apposition of cementum over dentin

25. What are succedaneous teeth?
Differentiation - proliferation - morphogenesis
Cementoblasts
The stellate reticulum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

26. Do odontoblasts start their secretion of matrix before the ameloblasts?
Enamel organ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Proliferation - differentiation - morphogenesis
Cuboidal cells

27. What is cementogenisis?
11th to 12th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
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.
Apposition of the cementum

28. What kind of cells reside in the stratum intermediate?
Alveolar bone
Dental tissues secreted as matrix in successive layers.
Compressed layer of flat to cuboidal cells
Dental papilla

29. What are the development disturbances of the apposition and maturation stages?
Preameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Osteocytes
Enamel pearl - enamel dysplasia - and concresence

30. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dentin and alveolar bone
During the cap stage

31. What will the outer cells of the dental lamina differentiate into?
Dentin and alveolar bone
Induction - proliferation
Enamel organ
Dentin secreting cells (odontoblats)

32. What is concrescence?
The basement membrane that seperates the enamel organ and dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Union of root structure of two or more teeth by cementum
The stellate reticulum

33. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The basement membrane
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
9th to 10th weeks

34. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
The 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.
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

35. When does dens in dente occur?
6th to 7th weeks
There is unequal growth in different parts of the tooth bud
The cementum - PDL - and alveolar bone
During the cap stage

36. What happens during the apposition stage?
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
Dental tissues secreted as matrix in successive layers.
Local or systemic or hereditary
Epithelial rests of Malassez

37. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Abnormally small teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
A mineralized cylinder - the dentinal tubule
Dentin secreting cells (odontoblats)

38. Where does the primordium of the permanent dentition develop?
The outer enamel epithelium
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel
Union of 2 adjacent tooth germs

39. What are the etiological factors of tubercle?
The bud stage
Dental papilla
Odontogenesis
Trauma - pressure or metabolic disease

40. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Only dentinal tubules with processes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Hereditary

41. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Faulty development of enamel from interference involving ameloblasts
Outer
The dental sac

42. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Differentiation - proliferation - morphogenesis
As a result of the apposition of cementum over dentin
Cementoid

43. What happens during initiation?
Enamel organ invaginates into the dental papilla
The dental lamina
The apposition of the enamel matrix
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

44. What stage does anodontia occur?
Dental tissues secreted as matrix in successive layers.
Dental follicle
Initiation stage
The apposition of the enamel matrix

45. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
A mineralized cylinder - the dentinal tubule
Traumatic injury or crowding of teeth
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

46. How many types of cells are found in the enamel organ in the bell stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Tall columnar cells
4 types

47. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Differentiation - proliferation - morphogenesis
The dental lamina
It disintegrates as the developing oral mucosa comes to line the oral cavity

48. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectomesenchyme - which was influenced by the neural crest cells
Only dentinal tubules with processes
Future dentin and pulp tissue

49. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The apposition of the enamel matrix
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Osteoblasts

50. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Cementoid
9th to 10th weeks
Growth of the dental lamina into bud that penetrates growing ectomesenchyme