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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. The stellate reticulum is located inner or outer?
Outer
Extra cusp due to effects on enamel organ
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
The primordium of the pulp

2. How is the dentinocemental junction formed?
Sphere of enamel on root
As a result of the apposition of cementum over dentin
Oral epithelium
Union of root structure of two or more teeth by cementum

3. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
Tall columnar cells
Induction - proliferation
Enamel

4. What happens during the cap stage?
The basement membrane
Alveolar bone
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.
A bilayer rim that consists only IEE and OEE

5. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Local or systemic or hereditary
As a result of the apposition of cementum over dentin

6. What are the etiological factors of enamel dysplasia?
Enamel organ
Abnormally small teeth
Local or systemic or hereditary
Enamel secreting cells (ameloblasts)

7. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The actual vertical movement of the tooth

8. What kind of cells occur in the outer enamel epithelium in the bell stage?
Hereditary in localized form. endocrine dysfunction is complete
Cuboidal cells
9th to 10th weeks
It disintegrates as the developing oral mucosa comes to line the oral cavity

9. What will the dental papilla eventually form?
Future dentin and pulp tissue
There are none - they are lost with eruption
Cementoblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

10. What are entrapped cementoblasts called?
Maturation
Traumatic injury or crowding of teeth
Cementocytes
Local or systemic or hereditary

11. In the cap stage the tooth bud does not grow - what happens?
It disintegrates as the developing oral mucosa comes to line the oral cavity
There is unequal growth in different parts of the tooth bud
The ameloblasts
Induction - proliferation

12. What are the incremental lines for enamel?
Lines of Retzuis
The ameloblasts place an acellular dental cuticle on the new enamel surface
Only dentinal tubules with processes
In the cap stage

13. What is the site for the future dentioenamel junction?
There are none - they are lost with eruption
The basement membrane that seperates the enamel organ and dental papilla
Osteocytes
The bud stage

14. What is the predominate process of the cap stage?
Hereditary in localized form. endocrine dysfunction is complete
The basement membrane
Morphogenesis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

15. What happens during initiation?
Bud stage
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
Cementoblasts
Absence of single or multiple teeth

16. What is matrix?
Tooth germ tries to divide
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontoclasts
Morphogenesis

17. What is the cementum matrix called?
There is unequal growth in different parts of the tooth bud
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cementoid
Initiation

18. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Dental tissues secreted as matrix in successive layers.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Traumatic injury or crowding of teeth

19. What else undergoes proliferation in the bud stage besides the dental lamina?
Odontogenesis
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
Lines of Retzuis
The ectomesenchyme

20. What kind of cells occur in the inner enamel epithelium?
The ectomesenchyme - which was influenced by the neural crest cells
The outer cells of the dental papilla and the central cells of the dental papilla
Tall columnar cells
Traumatic injury or crowding of teeth

21. What is the main process involved in initiation?
Sphere of enamel on root
In the cap stage
Dental tissues fully mineralize to their mature levels.
Induction

22. How many types of cells are found in the enamel organ in the bell stage?
The ectomesenchyme - which was influenced by the neural crest cells
May be confused as calculus deposit on root
4 types
The outer cells of the dental papilla and the central cells of the dental papilla

23. What are the etiological factors for anodontia?
The primordium of the pulp
Morphogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The cementum - PDL - and alveolar bone

24. What are the mature cells for enamel?
Absence of single or multiple teeth
Dental papilla
There are none - they are lost with eruption
A bilayer rim that consists only IEE and OEE

25. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Union of root structure of two or more teeth by cementum
Cementoblasts
Odontoblastic process
Imbrication lines of von Ebner

26. What kind of cells reside in the stratum intermediate?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
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
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

27. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Dental papilla
Cementoid
Dentin and alveolar bone

28. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Outer
Epithelial rests of Malassez
Imbrication lines of von Ebner

29. What processes are involved in the bell stage?
The bud stage
Differentiation - proliferation - morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The ectomesenchyme

30. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Absence of single or multiple teeth
The outer cells of the dental papilla and the central cells of the dental papilla
Induction - proliferation
6th to 7th weeks

31. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Epithelial
Cementoblasts
Apposition of the cementum
The enamel organ

32. Where is the enamel matrix secreted from by the ameloblasts?

33. Do odontoblasts start their secretion of matrix before the ameloblasts?
Enamel pearl - enamel dysplasia - and concresence
Tall columnar cells
Maturation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

34. What are the clinical ramifications of gemination?

35. What are the odontoblastic processes is contained in what?
Differentiation - proliferation - morphogenesis
Cementoblasts
Inner
A mineralized cylinder - the dentinal tubule

36. What is the structure responsible for root development?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Pressure on the area
The cervical loop
Enamel organ invaginates into the dental papilla

37. What are the etiological factors for enamel pearl?
Enamel
The outer cells of the dental papilla and the central cells of the dental papilla
Displacement of ameloblasts to root surface
The bud stage

38. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
The enamel organ - dental papilla - dental sac
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Osteoblasts

39. What are the developmental disturbances of the cap stage?
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
The ectoderm
Hereditary
Dens in dente - gemination - tubercle - and fusion

40. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Commonly involves permanent maxillary lateral incisor and 3rd molars
Induction - proliferation
Common on permanent molars or cingulum of anterior teeth

41. What is anodontia?
The tooth germ
Absence of single or multiple teeth
Trauma - pressure or metabolic disease
Future dentin and pulp tissue

42. What are the development disturbances of the apposition and maturation stages?
Oral epithelium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel pearl - enamel dysplasia - and concresence
Sphere of enamel on root

43. Which layer in the bell stage has star shaped cells?
Dens in dente - gemination - tubercle - and fusion
The stellate reticulum
The enamel organ is compressed
Common with permanent maxillary molars

44. The preameloblasts induce dental papilla cells to differentiate into what?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial rests of Malassez
The enamel organ - dental papilla - dental sac
Into odontoblasts

45. What is another name for the dental sac?
Dental follicle
The ectomesenchyme - which was influenced by the neural crest cells
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 ectoderm

46. What is the time span for the bud stage?
The ameloblasts
8th week
Preameloblasts
The tooth germ

47. What is cementogenisis?
Epithelial rests of Malassez
Dental follicle
Apposition of the cementum
Cementoid

48. What is the process involved in the maturation stage?
Maturation
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
Displacement of ameloblasts to root surface
The ectoderm

49. What stage does supernumerary teeth occur?
Initiation
Dental tissues fully mineralize to their mature levels.
Maturation
In the cap stage

50. How is the reduced enamel epithelium created?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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 cervical loop
The enamel organ is compressed