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?
Abnormally small teeth
As a result of the apposition of cementum over dentin
Faulty development of enamel from interference involving ameloblasts
The ameloblasts

2. What happens during initiation?
The primordium of the pulp
Enamel pearl - enamel dysplasia - and concresence
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
Imbrication lines of von Ebner

3. What processes are involved in the bell stage?
Enamel pearl - enamel dysplasia - and concresence
Tall columnar cells
Differentiation - proliferation - morphogenesis
Dental tissues secreted as matrix in successive layers.

4. What are the clinical ramifications of anodontia?
The outer cells of the dental papilla and the central cells of the dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
As a result of the apposition of cementum over dentin
The ameloblasts

5. What is macrodontia?
Abnormally large teeth
Dentin and alveolar bone
Displacement of ameloblasts to root surface
The enamel organ is compressed

6. What is the primordium of the tooth?
The dental sac
Dentin secreting cells (odontoblats)
The basement membrane
The tooth germ

7. What happens when the reduced enamel epithelium is created?
The ameloblasts
Pressure on the area
Differentiation - proliferation - morphogenesis
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

8. What is the embryological background for dentin - cementum and alveolar bone?
Enamel
4 types
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dental papilla

9. What is microdontia?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Faulty development of enamel from interference involving ameloblasts
Abnormally small teeth
Displacement of ameloblasts to root surface

10. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The basement membrane that seperates the enamel organ and dental papilla
The outer cells of the dental papilla and the central cells of the dental papilla
Maturation
The enamel organ is compressed

11. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
There are none - they are lost with eruption
Odontoclasts
Enamel organ
Only dentinal tubules with processes

12. What do the odontoblasts do?
Initiation stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cementoblasts
The ectomesenchyme

13. What will the outer cells of the dental lamina differentiate into?
Hereditary in localized form. endocrine dysfunction is complete
Future dentin and pulp tissue
Dentin secreting cells (odontoblats)
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

14. The stratum intermediate is located inner or outer?
Tooth germ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Inner
It disintegrates as the developing oral mucosa comes to line the oral cavity

15. What is fusion?
Union of 2 adjacent tooth germs
The bud stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
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

16. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Extra cusp due to effects on enamel organ
Odontoblastic process

17. Where is the dental sac originally derived from?
Enamel organ
It disintegrates as the developing oral mucosa comes to line the oral cavity
Osteocytes
The ectomesenchyme

18. What is the main process involved in the bud stage?
Proliferation
Morphogenesis
Common on permanent molars or cingulum of anterior teeth
Dentin and alveolar bone

19. What are the mature cells for enamel?
In the cap stage
Maturation
There are none - they are lost with eruption
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

20. Tooth development
Odontogenesis
4 types
The cementum - PDL - and alveolar bone
The ectomesenchyme

21. What is tubercle?
The apposition of the enamel matrix
Extra cusp due to effects on enamel organ
Cementoblasts
There is unequal growth in different parts of the tooth bud

22. What will the inner cells of the dental lamina differentiates into?
The basement membrane that seperates the enamel organ and dental papilla
Maturation
The enamel organ
The primordium of the pulp

23. What are the etiological factors for micro/macrodontia?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Development of one or more extra teeth
Dental follicle
Hereditary in localized form. endocrine dysfunction is complete

24. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Traumatic injury or crowding of teeth
Tall columnar cells
Alveolar bone

25. What are the etiological factors of enamel dysplasia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Local or systemic or hereditary
May be confused as calculus deposit on root
The ameloblasts place an acellular dental cuticle on the new enamel surface

26. What are the incremental lines for enamel?
Lines of Retzuis
Arrest and reversal lines
Trauma - pressure or metabolic disease
The ectomesenchyme

27. 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
The enamel organ
There is unequal growth in different parts of the tooth bud
Differentiation

28. What type of tissue is enamel?
Epithelial
The primordium of the pulp
Cementoblasts
Dentin secreting cells (odontoblats)

29. What are entrapped cementoblasts called?
Differentiation - proliferation - morphogenesis
Dental follicle
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Cementocytes

30. Where is the enamal organ originally derived from?
The ectoderm
Pressure on the area
Cementocytes
The enamel organ - dental papilla - dental sac

31. Which teeth are nonsuccedaneous?
The permanent molars
Dens in dente - gemination - tubercle - and fusion
Only dentinal tubules with processes
Differentiation - proliferation - morphogenesis

32. What are the etiological factors for supernumerary teeth?
Absence of single or multiple teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Future dentin and pulp tissue
Hereditary

33. What is matrix?
Connective
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementoblasts
The enamel organ is compressed

34. What are the formative cells for cementum?
Cementoblasts
During the cap stage
Displacement of ameloblasts to root surface
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

35. What hard tissue is innervated by nerves?
Dentin secreting cells (odontoblats)
The basement membrane
Proliferation - differentiation - morphogenesis
Dentin and alveolar bone

36. What processes are involved with the apposition stage?
Enamel pearl - enamel dysplasia - and concresence
The ameloblasts place an acellular dental cuticle on the new enamel surface
Induction - proliferation
Differentiation

37. What happens during the apposition stage?
The bud stage
Ameloblasts
Induction
Dental tissues secreted as matrix in successive layers.

38. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
9th to 10th weeks
The enamel organ
Initiation stage
The dental sac

39. What is the structure responsible for root development?
Arrest and reversal lines
Dental tissues fully mineralize to their mature levels.
The cervical loop
Odontoblastic process

40. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
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
Into odontoblasts
Inner

41. What is amelogenisis?
Enamel organ
Enamel
The cementum - PDL - and alveolar bone
The apposition of the enamel matrix

42. What will the dental papilla eventually form?
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
Cementoid
Future dentin and pulp tissue

43. What is enamel dysplasia?
Enamel pearl - enamel dysplasia - and concresence
The ectoderm
The tooth germ
Faulty development of enamel from interference involving ameloblasts

44. 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.
Induction
Cementocytes
Dental papilla

45. What kind of cells occur in the outer enamel epithelium in the bell stage?
9th to 10th weeks
The enamel - dentin - and cementum are secreted in successive layers
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cuboidal cells

46. Which layer in the bell stage has star shaped cells?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectomesenchyme
Induction - proliferation
The stellate reticulum

47. Where is the dental papilla originally derived from?
9th to 10th weeks
The ectomesenchyme - which was influenced by the neural crest cells
Extra cusp due to effects on enamel organ
During the cap stage

48. What is the embryological background for enamel?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Enamel organ
Tooth germ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

49. What are the etiological factors for fusion?
Pressure on the area
Odontogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The cervical loop

50. When does macro/microdontia occur?
The basement membrane
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Bud stage
Cuboidal cells