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 enamel dysplasia?
Sphere of enamel on root
The enamel - dentin - and cementum are secreted in successive layers
Faulty development of enamel from interference involving ameloblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

2. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The actual vertical movement of the tooth
Pressure on the area
Odontoblastic process
Only dentinal tubules with processes

3. What are the incremental lines for cementum and alveolar bone?
Dens in dente - gemination - tubercle - and fusion
Inner
Osteocytes
Arrest and reversal lines

4. What are the formative cells for cementum?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Absence of single or multiple teeth
Cementoblasts
4 types

5. What are the clinical ramifications of micro/macrodontia?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Imbrication lines of von Ebner
Commonly involves permanent maxillary lateral incisor and 3rd molars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

6. What are the clinical ramifications of enamel dysplasia?
Union of 2 adjacent tooth germs
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Initiation
The enamel - dentin - and cementum are secreted in successive layers

7. What is gemination?
There is unequal growth in different parts of the tooth bud
Tooth germ tries to divide
4 types
The enamel organ is compressed

8. What hard tissue is can not have tissue formation after eruption?
Imbrication lines of von Ebner
Epithelial rests of Malassez
Enamel
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

9. What stage does the dental tissues subsequently fully mineralize
Maturation
It disintegrates as the developing oral mucosa comes to line the oral cavity
Proliferation - differentiation - morphogenesis
Tooth germ tries to divide

10. What is the time span for the bud stage?
Dental tissues fully mineralize to their mature levels.
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
The enamel organ
8th week

11. What is macrodontia?
The stellate reticulum
Differentiation
Abnormally large teeth
The bud stage

12. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Enamel organ invaginates into the dental papilla
The stellate reticulum
Alveolar bone

13. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Sphere of enamel on root
Dentin secreting cells (odontoblats)
Epithelial

14. What happens during the cap stage?
As a result of the apposition of cementum over dentin
Extra cusp due to effects on enamel organ
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.
Initiation

15. What is the embryological background for dentin - cementum and alveolar bone?
The primordium of the pulp
Displacement of ameloblasts to root surface
Dental papilla
Tall columnar cells

16. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Extra cusp due to effects on enamel organ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

17. What are the etiological factors for supernumerary teeth?
Enamel pearl - enamel dysplasia - and concresence
Hereditary
Epithelial rests of Malassez
Preameloblasts

18. What is another name for the dental sac?
The outer cells of the dental papilla and the central cells of the dental papilla
The stellate reticulum
Dental follicle
Inner

19. What are entrapped cementoblasts called?
Enamel pearl - enamel dysplasia - and concresence
The basement membrane
Sphere of enamel on root
Cementocytes

20. What is the time span for the cap stage?
9th to 10th weeks
The enamel - dentin - and cementum are secreted in successive layers
Sphere of enamel on root
The ectomesenchyme - which was influenced by the neural crest cells

21. What are the etiological factors for dens in dente and gemination?
Abnormally large teeth
In the cap stage
Hereditary
Tall columnar cells

22. What do the odontoblasts do?
Faulty development of enamel from interference involving ameloblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Abnormally large teeth
Connective

23. What is anodontia?
Dentin secreting cells (odontoblats)
The stellate reticulum
Absence of single or multiple teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

24. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Pressure on the area
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Tall columnar cells

25. What is the main process involved in the bud stage?
The ectomesenchyme - which was influenced by the neural crest cells
Inner
Dental papilla
Proliferation

26. What type of tissue is dentin - cementum - and alveolar bone?
The dental sac
Development of one or more extra teeth
Connective
During the cap stage

27. What are the clinical ramifications?
The ectoderm
Tooth germ
Abnormally small teeth
Common on permanent molars or cingulum of anterior teeth

28. What kind of cells reside in the stratum intermediate?
6th to 7th weeks
The ectoderm
Compressed layer of flat to cuboidal cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

29. What stage does supernumerary teeth occur?
The basement membrane that seperates the enamel organ and dental papilla
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
Initiation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

30. What is amelogenisis?
Differentiation
The apposition of the enamel matrix
The ectomesenchyme
Sphere of enamel on root

31. What hard tissue is innervated by nerves?
The stellate reticulum
Dentin and alveolar bone
Inner
Preameloblasts

32. What are the resorptive cells for enamel - dentin - cementum and 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
Odontoclasts
In the cap stage
During the cap stage

33. What are the cell layers found in the enamel organ in the bell stage?
Odontoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
In the cap stage

34. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
4 types
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

35. What are the formative cells for dentin?
Faulty development of enamel from interference involving ameloblasts
Odontoblasts
Osteoblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars

36. The stellate reticulum is located inner or outer?
Dentin secreting cells (odontoblats)
Outer
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Local or systemic or hereditary

37. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ectomesenchyme
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

38. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Compressed layer of flat to cuboidal cells
Cementocytes

39. What are the etiological factors for fusion?
The ectoderm
Union of root structure of two or more teeth by cementum
Pressure on the area
The tooth germ

40. What is the structure responsible for root development?
In the cap stage
The cervical loop
The bud stage
Ameloblasts

41. When does the tooth bud become a tooth germ?
The cementum - PDL - and alveolar bone
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
In the cap stage

42. Active eruption
The actual vertical movement of the tooth
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Odontoblastic process
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

43. Which teeth are nonsuccedaneous?
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 stellate reticulum
The permanent molars
There is unequal growth in different parts of the tooth bud

44. What are the mature cells for cementum?
Preameloblasts
Cementocytes
The ectomesenchyme - which was influenced by the neural crest cells
The enamel organ is compressed

45. The stratum intermediate is located inner or outer?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Inner
Common with permanent maxillary molars

46. What is the primordium of the tooth?
Osteoblasts
The tooth germ
Dental tissues fully mineralize to their mature levels.
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

47. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Abnormally small teeth
Cuboidal cells
Dental papilla

48. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dens in dente - gemination - tubercle - and fusion
The ectomesenchyme - which was influenced by the neural crest cells

49. What is the main process involved in initiation?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Induction
The cementum - PDL - and alveolar bone
The outer cells of the dental papilla and the central cells of the dental papilla

50. What are the mature cells for enamel?
The dental lamina
Into odontoblasts
There are none - they are lost with eruption
Epithelial