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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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1. What hard tissue has vascularity?
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontoblastic process
Alveolar bone

2. What is the time span for the bud stage?
Maturation
8th week
Odontoclasts
Cementocytes

3. What is amelogenisis?
Hereditary in localized form. endocrine dysfunction is complete
The apposition of the enamel matrix
Absence of single or multiple teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

4. What is the time span for the bell stage?
Initiation
The dental sac
The enamel - dentin - and cementum are secreted in successive layers
11th to 12th weeks

5. What is the predominate process of the cap stage?
May be confused as calculus deposit on root
Morphogenesis
Union of 2 adjacent tooth germs
During the cap stage

6. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Proliferation - differentiation - morphogenesis
The basement membrane
The ectoderm
During the cap stage

7. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
The cervical loop
Cementocytes
The enamel organ is compressed

8. What kind of cells occur in the inner enamel epithelium?
Osteocytes
6th to 7th weeks
Tall columnar cells
Abnormally large teeth

9. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Alveolar bone
Induction - proliferation
Abnormally large teeth

10. What is the time span for the cap stage?
9th to 10th weeks
Enamel pearl - enamel dysplasia - and concresence
Osteocytes
The ectoderm

11. What kind of cells reside in the stratum intermediate?
Differentiation
Only dentinal tubules with processes
Compressed layer of flat to cuboidal cells
Induction

12. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Differentiation
Faulty development of enamel from interference involving ameloblasts
During the cap stage

13. Tooth development
Proliferation - differentiation - morphogenesis
Odontogenesis
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Displacement of ameloblasts to root surface

14. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Enamel organ invaginates into the dental papilla
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
There are none - they are lost with eruption
The bud stage

15. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Cementoblasts
Enamel organ invaginates into the dental papilla
The dental lamina

16. 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
The enamel - dentin - and cementum are secreted in successive layers
Tooth germ tries to divide
The ameloblasts place an acellular dental cuticle on the new enamel surface

17. What is tubercle?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Extra cusp due to effects on enamel organ
The ectomesenchyme

18. What happens during the cap stage?
Hereditary in localized form. endocrine dysfunction is complete
Faulty development of enamel from interference involving ameloblasts
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 outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

19. What are the clinical ramifications of fusion?
Proliferation
As a result of the apposition of cementum over dentin
Union of root structure of two or more teeth by cementum
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

20. What are the mature cells for enamel?
The basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
During the cap stage
There are none - they are lost with eruption

21. When does macro/microdontia occur?
Bud stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
The outer enamel epithelium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

22. What are the clinical ramifications of micro/macrodontia?
May be confused as calculus deposit on root
The outer enamel epithelium
Commonly involves permanent maxillary lateral incisor and 3rd molars
Extra cusp due to effects on enamel organ

23. What are the clinical ramifications of enamel dysplasia?
Dental follicle
The outer cells of the dental papilla and the central cells of the dental papilla
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
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

24. What is another name for the dental sac?
Union of 2 adjacent tooth germs
The dental sac
Extra cusp due to effects on enamel organ
Dental follicle

25. What wll the inner enamel epithelium differentiate into?
Preameloblasts
Initiation
Enamel secreting cells (ameloblasts)
Connective

26. What are the incremental lines for enamel?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
6th to 7th weeks
The permanent molars
Lines of Retzuis

27. What are the cell layers found in the enamel organ in the bell stage?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Cementoblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

28. What are the developmental disturbances of the cap stage?
11th to 12th weeks
Dental follicle
Epithelial
Dens in dente - gemination - tubercle - and fusion

29. What are the etiological factors of tubercle?
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
Development of one or more extra teeth
The dental sac
Trauma - pressure or metabolic disease

30. When does the process of root development take place?
Pressure on the area
11th to 12th weeks
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
6th to 7th weeks

31. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The ectomesenchyme - which was influenced by the neural crest cells
Osteocytes
Dental papilla
Tooth germ

32. What hard tissue is can not have tissue formation after eruption?
Apposition of the cementum
Sphere of enamel on root
Preameloblasts
Enamel

33. What are the clinical ramifications of anodontia?
The ectoderm
Hereditary
Dentin secreting cells (odontoblats)
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

34. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Sphere of enamel on root
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 dental sac

35. Where is the enamal organ originally derived from?
Induction
The ectomesenchyme
The ectoderm
Cementoid

36. What is macrodontia?
Cementocytes
Odontoblasts
Extra cusp due to effects on enamel organ
Abnormally large teeth

37. What are the formative cells for alveolar bone?
Osteoblasts
Differentiation
The apposition of the enamel matrix
The ectomesenchyme - which was influenced by the neural crest cells

38. What is the embryological background for dentin - cementum and alveolar bone?
Enamel
Dental papilla
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Outer

39. What hard tissue is innervated by nerves?
Future dentin and pulp tissue
Dentin and alveolar bone
Faulty development of enamel from interference involving ameloblasts
Dental papilla

40. What is the main process involved in initiation?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Induction
Epithelial
Preameloblasts

41. What is the outer portion of the ectoderm in the initiation stage?
Faulty development of enamel from interference involving ameloblasts
11th to 12th weeks
Oral epithelium
As a result of the apposition of cementum over dentin

42. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
The ectomesenchyme
Osteocytes
May be confused as calculus deposit on root

43. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
Imbrication lines of von Ebner
The basement membrane
Epithelial

44. Where is the dental papilla originally derived from?
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 - which was influenced by the neural crest cells
Induction
Dental tissues fully mineralize to their mature levels.

45. How many types of cells are found in the enamel organ in the bell stage?
Dental tissues secreted as matrix in successive layers.
4 types
The enamel organ is compressed
Hereditary

46. What is anodontia?
Absence of single or multiple teeth
Outer
Dentin and alveolar bone
Dens in dente - gemination - tubercle - and fusion

47. What are the etiological factors for fusion?
Enamel organ invaginates into the dental papilla
Pressure on the area
A mineralized cylinder - the dentinal tubule
The dental sac

48. Do odontoblasts start their secretion of matrix before the ameloblasts?
Maturation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The actual vertical movement of the tooth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

49. How is the reduced enamel epithelium created?
The permanent molars
11th to 12th weeks
The enamel organ is compressed
Abnormally large teeth

50. What will the dental papilla eventually form?
Dental papilla
In the cap stage
Future dentin and pulp tissue
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