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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. Where is the dental sac originally derived from?
Tooth germ
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme
Enamel pearl - enamel dysplasia - and concresence

2. The oral epithelium is induced by the ectomesenchyme to produce what?
Odontoblastic process
Osteocytes
Hereditary
The dental lamina

3. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Dental tissues fully mineralize to their mature levels.
Development of one or more extra teeth
The dental lamina

4. What is enamel dysplasia?
A mineralized cylinder - the dentinal tubule
Alveolar bone
Differentiation
Faulty development of enamel from interference involving ameloblasts

5. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
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
Abnormally small teeth
Dens in dente - gemination - tubercle - and fusion

6. What stage does supernumerary teeth occur?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Initiation
Induction - proliferation
Odontoblasts

7. What kind of cells reside in the stratum intermediate?
The enamel organ - dental papilla - dental sac
Compressed layer of flat to cuboidal cells
Faulty development of enamel from interference involving ameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

8. What type of tissue is dentin - cementum - and alveolar bone?
Abnormally small teeth
11th to 12th weeks
Lines of Retzuis
Connective

9. What are the clinical ramifications of enamel dysplasia?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
A mineralized cylinder - the dentinal tubule
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dental follicle

10. What is the cementum matrix called?
Cementoid
The outer cells of the dental papilla and the central cells of the dental papilla
The permanent 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

11. What processes are involved in the bell stage?
Cementoblasts
Enamel
Differentiation - proliferation - morphogenesis
Cementocytes

12. What is an enamel pearl?
As a result of the apposition of cementum over dentin
Cuboidal cells
Extra cusp due to effects on enamel organ
Sphere of enamel on root

13. What are the etiological factors of tubercle?
The bud stage
Trauma - pressure or metabolic disease
Dental tissues secreted as matrix in successive layers.
Future dentin and pulp tissue

14. When does the tooth bud become a tooth germ?
Maturation
Union of root structure of two or more teeth by cementum
In the cap stage
Faulty development of enamel from interference involving ameloblasts

15. Where is the enamal organ originally derived from?
Induction - proliferation
The ectoderm
May be confused as calculus deposit on root
Dental follicle

16. What wll the inner enamel epithelium differentiate into?
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
Enamel secreting cells (ameloblasts)
Enamel pearl - enamel dysplasia - and concresence
Ameloblasts

17. What are the formative cells for cementum?
Enamel secreting cells (ameloblasts)
Cementoblasts
Odontoblasts
Into odontoblasts

18. What else undergoes proliferation in the bud stage besides the dental lamina?
Cementoblasts
The ectomesenchyme
Dentin and alveolar bone
Tooth germ

19. What are the clinical ramifications of gemination?

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20. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The dental lamina
The bud stage
Odontoblastic process
Abnormally small teeth

21. How many types of cells are found in the enamel organ in the bell stage?
4 types
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
Dental papilla
Common on permanent molars or cingulum of anterior teeth

22. What are the etiological factors for enamel pearl?
The cervical loop
Bud stage
Displacement of ameloblasts to root surface
Absence of single or multiple teeth

23. What is the time span for the cap stage?
9th to 10th weeks
Hereditary in localized form. endocrine dysfunction is complete
Cementocytes
Arrest and reversal lines

24. What is the predominate process of the cap stage?
Development of one or more extra teeth
The ectomesenchyme
Osteoblasts
Morphogenesis

25. What is the structure responsible for root development?
The outer cells of the dental papilla and the central cells of the dental papilla
Induction
Preameloblasts
The cervical loop

26. What are the clinical ramifications of micro/macrodontia?
Induction - proliferation
The stellate reticulum
Odontoblastic process
Commonly involves permanent maxillary lateral incisor and 3rd molars

27. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Dental tissues fully mineralize to their mature levels.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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

28. What is the time span for initiation?
A bilayer rim that consists only IEE and OEE
6th to 7th weeks
Displacement of ameloblasts to root surface
The ameloblasts

29. What do the odontoblasts do?
Union of 2 adjacent tooth germs
Only dentinal tubules with processes
Future dentin and pulp tissue
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

30. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Abnormally small teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Odontoclasts

31. What is the main process involved in initiation?
Induction
Enamel organ invaginates into the dental papilla
Apposition of the cementum
Cementoblasts

32. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Connective
Bud stage
The enamel organ

33. What are the clinical ramifications of anodontia?
Dentin and alveolar bone
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Trauma - pressure or metabolic disease
9th to 10th weeks

34. What happens when the reduced enamel epithelium is created?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Epithelial
Absence of single or multiple teeth
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

35. What is the predominate process in the bell stage?
Inner
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Differentiation
Preameloblasts

36. What hard tissue is innervated by nerves?
Enamel organ
Dentin and alveolar bone
Initiation stage
Dental papilla

37. When does macro/microdontia occur?
Displacement of ameloblasts to root surface
Bud stage
Local or systemic or hereditary
Common with permanent maxillary molars

38. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Odontogenesis
Only dentinal tubules with processes
The outer cells of the dental papilla and the central cells of the dental papilla
Tooth germ

39. What hard tissue has vascularity?
The cementum - PDL - and alveolar bone
There is unequal growth in different parts of the tooth bud
Tooth germ
Alveolar bone

40. What is microdontia?
Abnormally small teeth
Outer
The enamel organ
Dental papilla

41. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The enamel organ
Cementocytes
Connective
Preameloblasts

42. What are the incremental lines for cementum and alveolar bone?
Sphere of enamel on root
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Maturation
Arrest and reversal lines

43. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Dental papilla
May be confused as calculus deposit on root
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementoblasts

44. What happens during the maturation stage?
Odontoclasts
The primordium of the pulp
The actual vertical movement of the tooth
Dental tissues fully mineralize to their mature levels.

45. What is the primordium of the tooth?
Epithelial rests of Malassez
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 actual vertical movement of the tooth
The tooth germ

46. What are the formative cells for dentin?
Odontoblasts
Dental papilla
Hereditary in localized form. endocrine dysfunction is complete
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

47. Which teeth are nonsuccedaneous?
The permanent molars
The ectomesenchyme - which was influenced by the neural crest cells
Cementoid
Enamel organ

48. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Union of 2 adjacent tooth germs
The ectomesenchyme
Odontoclasts

49. What kind of cells occur in the outer enamel epithelium in the bell stage?
Enamel pearl - enamel dysplasia - and concresence
Cuboidal cells
Dental tissues fully mineralize to their mature levels.
The outer enamel epithelium

50. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementoid
Epithelial