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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. What happens during the bell stage?
Osteocytes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Apposition of the cementum
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

2. What are the clinical ramifications of enamel dysplasia?
The basement membrane that seperates the enamel organ and dental papilla
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 cementum - PDL - and alveolar bone

3. What is the function of the Hertwig's epithelial root sheath?
Hereditary in localized form. endocrine dysfunction is complete
Lines of Retzuis
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

4. What is the primordium of the tooth?
The tooth germ
The ectomesenchyme
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Abnormally small teeth

5. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The outer enamel epithelium
Only dentinal tubules with processes
Trauma - pressure or metabolic disease

6. How many types of cells are found in the enamel organ in the bell stage?
Compressed layer of flat to cuboidal cells
Osteocytes
Abnormally large teeth
4 types

7. What are the mature cells for enamel?
Proliferation
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
There are none - they are lost with eruption
Cuboidal cells

8. Which teeth are nonsuccedaneous?
The permanent molars
Enamel pearl - enamel dysplasia - and concresence
Maturation
6th to 7th weeks

9. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Lines of Retzuis
Into odontoblasts
The enamel organ

10. Where is the enamal organ originally derived from?
Dental follicle
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Odontoblasts
The ectoderm

11. What is the structure responsible for root development?
The cervical loop
Union of root structure of two or more teeth by cementum
The basement membrane that seperates the enamel organ and dental papilla
Abnormally large teeth

12. What stage does supernumerary teeth occur?
Initiation
8th week
Only dentinal tubules with processes
A bilayer rim that consists only IEE and OEE

13. What is amelogenisis?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tooth germ
The apposition of the enamel matrix
Bud stage

14. Do odontoblasts start their secretion of matrix before the ameloblasts?
Odontoblasts
4 types
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Arrest and reversal lines

15. When does the tooth bud become a tooth germ?
There is unequal growth in different parts of the tooth bud
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
In the cap stage
Alveolar bone

16. What are the formative cells for cementum?
Dentin and alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoblasts
Future dentin and pulp tissue

17. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Common on permanent molars or cingulum of anterior teeth
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.
The ectomesenchyme
The ameloblasts

18. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Compressed layer of flat to cuboidal cells
The outer cells of the dental papilla and the central cells of the dental papilla
Cementoblasts
Union of root structure of two or more teeth by cementum

19. What is the process involved in the maturation stage?
6th to 7th weeks
The bud 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.
Maturation

20. What happens during initiation?
Dentin and alveolar bone
Apposition of the cementum
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

21. What are the etiological factors of concrescence?
Dens in dente - gemination - tubercle - and fusion
In the cap stage
Enamel
Traumatic injury or crowding of teeth

22. What are the formative cells for alveolar bone?
Cementocytes
Common on permanent molars or cingulum of anterior teeth
Osteoblasts
Enamel secreting cells (ameloblasts)

23. What is the main process involved in 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
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Induction
Tall columnar cells

24. What are the major components of the tooth germ?
The dental sac
The enamel organ - dental papilla - dental sac
The outer enamel epithelium
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

25. What are the clinical ramifications of concrescence?
Abnormally large teeth
The outer cells of the dental papilla and the central cells of the dental papilla
Dens in dente - gemination - tubercle - and fusion
Common with permanent maxillary molars

26. When does dens in dente occur?
During the cap stage
Hereditary
Oral epithelium
Maturation

27. What are the mature cells for dentin?
Only dentinal tubules with processes
Epithelial rests of Malassez
When the gingiva recedes and no actual tooth movement takes place
Imbrication lines of von Ebner

28. The preameloblasts induce dental papilla cells to differentiate into what?
11th to 12th weeks
Into odontoblasts
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.
Dental tissues fully mineralize to their mature levels.

29. The oral epithelium is induced by the ectomesenchyme to produce what?
Oral epithelium
The dental lamina
Dentin and alveolar bone
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

30. What is another name for the dental sac?
Cementoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dental follicle
Epithelial rests of Malassez

31. What are the etiological factors for dens in dente and gemination?
Tooth germ tries to divide
Hereditary
Development of one or more extra teeth
Odontogenesis

32. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
4 types
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The enamel organ

33. What is the time span for the bell stage?
Connective
It disintegrates as the developing oral mucosa comes to line the oral cavity
11th to 12th weeks
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

34. What is the predominate process in the bell stage?
Hereditary
It disintegrates as the developing oral mucosa comes to line the oral cavity
Differentiation
The apposition of the enamel matrix

35. How is the reduced enamel epithelium created?
Cementocytes
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel organ is compressed

36. Which layer in the bell stage has star shaped cells?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
There are none - they are lost with eruption
The actual vertical movement of the tooth
The stellate reticulum

37. 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
Dentin and alveolar bone
Hereditary
A mineralized cylinder - the dentinal tubule

38. 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
It disintegrates as the developing oral mucosa comes to line the oral cavity
There are none - they are lost with eruption
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

39. What is an enamel pearl?
Maturation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The permanent molars
Sphere of enamel on root

40. What wll the inner enamel epithelium differentiate into?
Tooth germ
The bud stage
The basement membrane
Enamel secreting cells (ameloblasts)

41. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Ameloblasts
Imbrication lines of von Ebner
As a result of the apposition of cementum over dentin

42. When does the process of root development take place?
The enamel organ is compressed
Oral epithelium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
May be confused as calculus deposit on root

43. What kind of cells occur in the outer enamel epithelium in the bell stage?
During the cap stage
Cuboidal cells
Induction
Absence of single or multiple teeth

44. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The enamel organ - dental papilla - dental sac
Initiation
The enamel organ is compressed
Odontoclasts

45. What is the time span for the bud stage?
Union of 2 adjacent tooth germs
Abnormally small teeth
Enamel pearl - enamel dysplasia - and concresence
8th week

46. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
The enamel organ
Cuboidal cells
Development of one or more extra teeth

47. What will the dental papilla eventually form?
Future dentin and pulp tissue
The ameloblasts
Arrest and reversal lines
Abnormally large teeth

48. What type of tissue is dentin - cementum - and alveolar bone?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The cementum - PDL - and alveolar bone
Connective
Oral epithelium

49. What is tubercle?
Dental papilla
Enamel secreting cells (ameloblasts)
Extra cusp due to effects on enamel organ
The actual vertical movement of the tooth

50. What will the outer cells of the dental lamina differentiate into?
Initiation
Local or systemic or hereditary
Dentin secreting cells (odontoblats)
Enamel organ invaginates into the dental papilla