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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. Where is the enamal organ originally derived from?
The ectoderm
Dental follicle
A mineralized cylinder - the dentinal tubule
Epithelial rests of Malassez

2. What is the embryological background for enamel?
Odontoclasts
Enamel organ
The bud stage
6th to 7th weeks

3. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Dental tissues fully mineralize to their mature levels.
The cementum - PDL - and alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Alveolar bone

4. What are the etiological factors for enamel pearl?
9th to 10th weeks
Enamel organ
May be confused as calculus deposit on root
Displacement of ameloblasts to root surface

5. What is cementogenisis?
Apposition of the cementum
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
Odontoblasts
Proliferation

6. Tooth development
8th week
Alveolar bone
Odontogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

7. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The outer enamel epithelium

8. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel organ is compressed
Absence of single or multiple teeth

9. What are the etiological factors for anodontia?
Sphere of enamel on root
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Initiation
Proliferation - differentiation - morphogenesis

10. What is the main process involved in initiation?
A mineralized cylinder - the dentinal tubule
Tooth germ
Induction
The enamel - dentin - and cementum are secreted in successive layers

11. What are supernumerary teeth?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Development of one or more extra teeth
There are none - they are lost with eruption
Abnormally small teeth

12. What else undergoes proliferation in the bud stage besides the dental lamina?
Faulty development of enamel from interference involving ameloblasts
Cementocytes
The ameloblasts
The ectomesenchyme

13. What are the developmental disturbances of the cap stage?
A bilayer rim that consists only IEE and OEE
Dens in dente - gemination - tubercle - and fusion
The enamel - dentin - and cementum are secreted in successive layers
Cuboidal cells

14. What are the etiological factors for supernumerary teeth?
Dental follicle
Dental tissues fully mineralize to their mature levels.
Hereditary
Inner

15. What is the cementum matrix called?
Cementoid
The ameloblasts
Dental papilla
The enamel organ

16. What stage does supernumerary teeth occur?
Initiation
Pressure on the area
Dental papilla
Odontoclasts

17. What is concrescence?
Cementocytes
The dental lamina
Union of root structure of two or more teeth by cementum
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

18. What does the cervical loop consist of?
There is unequal growth in different parts of the tooth bud
A bilayer rim that consists only IEE and OEE
Enamel organ
The primordium of the pulp

19. Active eruption
May be confused as calculus deposit on root
Proliferation
The actual vertical movement of the tooth
Tall columnar cells

20. What is the embryological background for dentin - cementum and alveolar bone?
When the gingiva recedes and no actual tooth movement takes place
Dental papilla
Inner
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

21. What is the time span for the bell stage?
11th to 12th weeks
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

22. What is the site for the future dentioenamel junction?
The ectoderm
The basement membrane that seperates the enamel organ and dental papilla
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Traumatic injury or crowding of teeth

23. What kind of cells reside in the stratum intermediate?
There is unequal growth in different parts of the tooth bud
Compressed layer of flat to cuboidal cells
Future dentin and pulp tissue
Into odontoblasts

24. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
A bilayer rim that consists only IEE and OEE
Hereditary
The ameloblasts
The enamel organ - dental papilla - dental sac

25. What is the function of the Hertwig's epithelial root sheath?
When the gingiva recedes and no actual tooth movement takes place
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

26. What are the clinical ramifications of supernumerary teeth?
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 basement membrane
Morphogenesis
Alveolar bone

27. What happens during initiation?
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
Cementoblasts
Tooth germ tries to divide

28. 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
May be confused as calculus deposit on root
Hereditary
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

29. What is dens in dente?
A bilayer rim that consists only IEE and OEE
Oral epithelium
Enamel organ invaginates into the dental papilla
Initiation

30. What is amelogenisis?
The enamel - dentin - and cementum are secreted in successive layers
Dentin secreting cells (odontoblats)
The apposition of the enamel matrix
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

31. What will the inner cells of the dental lamina differentiates into?
There are none - they are lost with eruption
Abnormally large teeth
The ectomesenchyme
The primordium of the pulp

32. What happens during the maturation stage?
Epithelial rests of Malassez
Commonly involves permanent maxillary lateral incisor and 3rd molars
The basement membrane
Dental tissues fully mineralize to their mature levels.

33. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Tooth germ tries to divide
A bilayer rim that consists only IEE and OEE
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

34. What hard tissue has vascularity?
9th to 10th weeks
Differentiation - proliferation - morphogenesis
Alveolar bone
The enamel organ - dental papilla - dental sac

35. What are the mature cells for dentin?
Enamel secreting cells (ameloblasts)
The outer cells of the dental papilla and the central cells of the dental papilla
Only dentinal tubules with processes
Trauma - pressure or metabolic disease

36. What are the mature cells for cementum?
The cervical loop
There is unequal growth in different parts of the tooth bud
11th to 12th weeks
Cementocytes

37. What are the formative cells for cementum?
Outer
Cementoblasts
Absence of single or multiple teeth
Faulty development of enamel from interference involving ameloblasts

38. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The cementum - PDL - and alveolar bone
The bud stage
Lines of Retzuis

39. What are the major components of the tooth germ?
Initiation
9th to 10th weeks
The enamel organ - dental papilla - dental sac
Differentiation

40. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The outer enamel epithelium
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The bud stage
The ameloblasts place an acellular dental cuticle on the new enamel surface

41. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Proliferation
Epithelial
Union of 2 adjacent tooth germs

42. What are the mature cells for enamel?
Dental follicle
There are none - they are lost with eruption
9th to 10th weeks
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.

43. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Absence of single or multiple teeth
The stellate reticulum
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

44. How is the dentinocemental junction formed?
Enamel secreting cells (ameloblasts)
Hereditary
As a result of the apposition of cementum over dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

45. How is the reduced enamel epithelium created?
The enamel organ is compressed
May be confused as calculus deposit on root
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Initiation stage

46. Which layer in the bell stage has star shaped cells?
Into odontoblasts
Lines of Retzuis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The stellate reticulum

47. Passive eruption
Development of one or more extra teeth
Union of 2 adjacent tooth germs
The outer enamel epithelium
When the gingiva recedes and no actual tooth movement takes place

48. What kind of cells occur in the inner enamel epithelium?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
11th to 12th weeks
Tall columnar cells
Dentin and alveolar bone

49. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Enamel secreting cells (ameloblasts)
Alveolar bone
The ameloblasts

50. What kind of cells occur in the outer enamel epithelium in the bell stage?
The apposition of the enamel matrix
Cuboidal cells
Epithelial rests of Malassez
The ameloblasts