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 tubercle?
9th to 10th weeks
When the gingiva recedes and no actual tooth movement takes place
Extra cusp due to effects on enamel organ
The enamel organ

2. What is the main process involved in the bud stage?
Cementoid
Compressed layer of flat to cuboidal cells
Proliferation
Union of 2 adjacent tooth germs

3. When does macro/microdontia occur?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Bud stage
4 types

4. What kind of cells occur in the inner enamel epithelium?
Arrest and reversal lines
Tall columnar cells
Dentin secreting cells (odontoblats)
Outer

5. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Only dentinal tubules with processes
The primordium of the pulp
Maturation

6. What stage does the dental tissues subsequently fully mineralize
As a result of the apposition of cementum over dentin
The actual vertical movement of the tooth
Maturation
Differentiation

7. When does the process of root development take place?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
A bilayer rim that consists only IEE and OEE
Dentin secreting cells (odontoblats)
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

8. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
Proliferation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The apposition of the enamel matrix

9. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Cementoblasts
8th week
Ameloblasts

10. How is the reduced enamel epithelium created?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial rests of Malassez
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The enamel organ is compressed

11. What is the outer portion of the ectoderm in the initiation stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Oral epithelium
Enamel organ
A mineralized cylinder - the dentinal tubule

12. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Differentiation - proliferation - morphogenesis
Common on permanent molars or cingulum of anterior teeth
Union of root structure of two or more teeth by cementum

13. What are the etiological factors for anodontia?
The enamel organ - dental papilla - dental sac
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cuboidal cells

14. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Hereditary
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

15. What are the etiological factors for micro/macrodontia?
Dental papilla
Hereditary in localized form. endocrine dysfunction is complete
Imbrication lines of von Ebner
Morphogenesis

16. What are the formative cells for cementum?
Differentiation - proliferation - morphogenesis
Outer
Cementoblasts
9th to 10th weeks

17. How is the dentinocemental junction formed?
Trauma - pressure or metabolic disease
Enamel pearl - enamel dysplasia - and concresence
As a result of the apposition of cementum over dentin
Oral epithelium

18. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
The permanent molars
Abnormally small teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

19. What happens during the maturation stage?
Odontoclasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
The dental lamina
Dental tissues fully mineralize to their mature levels.

20. What happens during the bud stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Tooth germ
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

21. What is amelogenisis?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The cervical loop
The enamel organ is compressed
The apposition of the enamel matrix

22. 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
Differentiation - proliferation - morphogenesis
Hereditary
The permanent molars

23. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
May be confused as calculus deposit on root
As a result of the apposition of cementum over dentin
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

24. What happens during the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
Union of 2 adjacent tooth germs
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

25. The oral epithelium is induced by the ectomesenchyme to produce what?
Proliferation
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
The dental lamina

26. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The cervical loop
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

27. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Initiation
Traumatic injury or crowding of teeth
Morphogenesis

28. What happens when the reduced enamel epithelium is created?
9th to 10th weeks
The tooth germ
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 enamel - dentin - and cementum are secreted in successive layers

29. What is concrescence?
The dental lamina
Bud stage
Oral epithelium
Union of root structure of two or more teeth by cementum

30. Where is the enamal organ originally derived from?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Epithelial
The ectoderm
The apposition of the enamel matrix

31. When does dens in dente occur?
Only dentinal tubules with processes
Displacement of ameloblasts to root surface
Imbrication lines of von Ebner
During the cap stage

32. What is anodontia?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementocytes
Bud stage
Absence of single or multiple teeth

33. What is the time span for initiation?
Induction
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Trauma - pressure or metabolic disease
6th to 7th weeks

34. What kind of cells reside in the stratum intermediate?
4 types
Pressure on the area
Induction - proliferation
Compressed layer of flat to cuboidal cells

35. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Proliferation
Proliferation - differentiation - morphogenesis
Initiation

36. What stage does supernumerary teeth occur?
Initiation
There are none - they are lost with eruption
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Tooth germ tries to divide

37. What is the cementum matrix called?
Cementoblasts
Dental tissues secreted as matrix in successive layers.
Cementoid
Maturation

38. What is matrix?
Trauma - pressure or metabolic disease
Enamel pearl - enamel dysplasia - and concresence
The primordium of the pulp
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

39. What is the process involved in the maturation stage?
Odontoclasts
Absence of single or multiple teeth
Maturation
Union of root structure of two or more teeth by cementum

40. What are supernumerary teeth?
Hereditary
Initiation stage
Displacement of ameloblasts to root surface
Development of one or more extra teeth

41. What is the structure responsible for root development?
Apposition of the cementum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The cervical loop

42. What are the incremental lines for dentin?
Odontoclasts
Morphogenesis
Imbrication lines of von Ebner
There is unequal growth in different parts of the tooth bud

43. What is microdontia?
Tooth germ
Abnormally small teeth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The cementum - PDL - and alveolar bone

44. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Preameloblasts
The basement membrane
Tooth germ

45. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Odontogenesis
Oral epithelium

46. What will the inner cells of the dental lamina differentiates into?
Alveolar bone
Dens in dente - gemination - tubercle - and fusion
The primordium of the pulp
Induction

47. What is the time span for the bud stage?
Dental follicle
Dental papilla
8th week
Enamel organ

48. What are the clinical ramifications of enamel dysplasia?
Differentiation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Differentiation - proliferation - morphogenesis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

49. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Common on permanent molars or cingulum of anterior teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cementocytes
Local or systemic or hereditary

50. What will the dental papilla eventually form?
The ectomesenchyme - which was influenced by the neural crest cells
Only dentinal tubules with processes
Future dentin and pulp tissue
Commonly involves permanent maxillary lateral incisor and 3rd molars