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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 kind of cells occur in the outer enamel epithelium in the bell 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.
Union of 2 adjacent tooth germs
During the cap stage
Cuboidal cells

2. What happens during the appositional stage?
Induction - proliferation
The enamel - dentin - and cementum are secreted in successive layers
The actual vertical movement of the tooth
Cementocytes

3. Active eruption
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementocytes
Hereditary
The actual vertical movement of the tooth

4. What is the time span for initiation?
The enamel organ is compressed
6th to 7th weeks
There is unequal growth in different parts of the tooth bud
The enamel organ - dental papilla - dental sac

5. What is the embryological background for enamel?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Induction
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 organ

6. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Inner
Ameloblasts
Only dentinal tubules with processes

7. What are the clinical ramifications of gemination?

8. What are the clinical ramifications of enamel pearl?
Dental papilla
May be confused as calculus deposit on root
Local or systemic or hereditary
Induction

9. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Trauma - pressure or metabolic disease
It disintegrates as the developing oral mucosa comes to line the oral cavity
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
When the gingiva recedes and no actual tooth movement takes place

10. What is anodontia?
Dens in dente - gemination - tubercle - and fusion
The basement membrane
Absence of single or multiple teeth
Enamel pearl - enamel dysplasia - and concresence

11. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Maturation
Odontoblasts
Dental tissues fully mineralize to their mature levels.

12. What wll the inner enamel epithelium differentiate into?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Abnormally small teeth
Enamel secreting cells (ameloblasts)
Outer

13. What is the primordium of the tooth?
The tooth germ
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
Development of one or more extra teeth

14. What will the dental papilla eventually form?
Hereditary
The dental sac
Future dentin and pulp tissue
8th week

15. What is enamel dysplasia?
There are none - they are lost with eruption
Dental tissues fully mineralize to their mature levels.
Maturation
Faulty development of enamel from interference involving ameloblasts

16. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoblasts
The dental lamina
Preameloblasts

17. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Lines of Retzuis
The dental sac
Cementoid

18. What are the formative cells for cementum?
Abnormally small teeth
Cementoblasts
Hereditary
Enamel organ invaginates into the dental papilla

19. What are the incremental lines for enamel?
Epithelial
Traumatic injury or crowding of teeth
8th week
Lines of Retzuis

20. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
As a result of the apposition of cementum over dentin
Cementoblasts
Arrest and reversal lines

21. What is the process involved in the maturation stage?
Alveolar bone
Future dentin and pulp tissue
Maturation
Absence of single or multiple teeth

22. What is dens in dente?
As a result of the apposition of cementum over dentin
Compressed layer of flat to cuboidal cells
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 organ invaginates into the dental papilla

23. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Induction
Faulty development of enamel from interference involving ameloblasts
Trauma - pressure or metabolic disease
Tooth germ

24. What is the main process involved in initiation?
Induction
The outer cells of the dental papilla and the central cells of the dental papilla
Arrest and reversal lines
The dental lamina

25. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Into odontoblasts
In the cap stage
Abnormally large teeth

26. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Odontoblastic process
Osteocytes
Inner

27. What is gemination?
The outer enamel epithelium
Hereditary in localized form. endocrine dysfunction is complete
Tooth germ tries to divide
The ameloblasts place an acellular dental cuticle on the new enamel surface

28. 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
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Proliferation
The enamel - dentin - and cementum are secreted in successive layers

29. What is another name for the dental sac?
In the cap stage
Bud stage
The cervical loop
Dental follicle

30. What are the developmental disturbances of the cap stage?
Cuboidal cells
Dens in dente - gemination - tubercle - and fusion
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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.

31. 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
Enamel organ invaginates into the dental papilla
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 bud stage

32. What are the etiological factors of tubercle?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
9th to 10th weeks
Trauma - pressure or metabolic disease
The ectomesenchyme

33. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
A mineralized cylinder - the dentinal tubule
Dental papilla
Odontoblastic process
The dental sac

34. Which layer in the bell stage has star shaped cells?
Odontoclasts
The stellate reticulum
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
Hereditary

35. What are the etiological factors for dens in dente and gemination?
Hereditary
Ameloblasts
Cementoid
There are none - they are lost with eruption

36. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

37. What is concrescence?
Dentin secreting cells (odontoblats)
Faulty development of enamel from interference involving ameloblasts
Union of root structure of two or more teeth by cementum
In the cap stage

38. What are the clinical ramifications of fusion?
Into odontoblasts
The apposition of the enamel matrix
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The dental lamina

39. What are the clinical ramifications of enamel dysplasia?
Alveolar bone
Local or systemic or hereditary
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

40. What are the clinical ramifications of concrescence?
Differentiation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Common with permanent maxillary molars
Development of one or more extra teeth

41. What happens during the maturation stage?
Initiation
The bud stage
9th to 10th weeks
Dental tissues fully mineralize to their mature levels.

42. The stratum intermediate is located inner or outer?
Inner
The ameloblasts
May be confused as calculus deposit on root
The actual vertical movement of the tooth

43. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
The cervical loop
The enamel organ
Tooth germ tries to divide

44. Do odontoblasts start their secretion of matrix before the ameloblasts?
Common with permanent maxillary molars
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Extra cusp due to effects on enamel organ
4 types

45. What is the cementum matrix called?
Maturation
Cementoid
The primordium of the pulp
Dentin secreting cells (odontoblats)

46. The oral epithelium is induced by the ectomesenchyme to produce what?
6th to 7th weeks
The dental lamina
Differentiation
Abnormally small teeth

47. What happens when the reduced enamel epithelium is created?
Displacement of ameloblasts to root surface
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
Bud stage
11th to 12th weeks

48. What are the formative cells for alveolar bone?
During the cap stage
Osteoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
The cervical loop

49. What is fusion?
The basement membrane that seperates the enamel organ and dental papilla
Cementocytes
Union of 2 adjacent tooth germs
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

50. What are the etiological factors of enamel dysplasia?
Outer
Alveolar bone
Local or systemic or hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics