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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 are the formative cells for alveolar bone?
6th to 7th weeks
Faulty development of enamel from interference involving ameloblasts
The enamel organ - dental papilla - dental sac
Osteoblasts

2. What are the etiological factors of enamel dysplasia?
Extra cusp due to effects on enamel organ
4 types
Maturation
Local or systemic or hereditary

3. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
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
8th week
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

4. What is the outer portion of the ectoderm in the initiation stage?
Epithelial
Enamel organ invaginates into the dental papilla
Oral epithelium
Odontogenesis

5. Where does the primordium of the permanent dentition develop?
Lines of Retzuis
Faulty development of enamel from interference involving ameloblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
During the cap stage

6. What is the predominate process of the cap stage?
The enamel organ is compressed
Morphogenesis
Induction
Union of root structure of two or more teeth by cementum

7. What stage does the dental tissues subsequently fully mineralize
Maturation
There is unequal growth in different parts of the tooth bud
The actual vertical movement of the tooth
The cervical loop

8. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Pressure on the area
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
Alveolar bone

9. The stratum intermediate is located inner or outer?
The cervical loop
Induction - proliferation
Inner
Commonly involves permanent maxillary lateral incisor and 3rd molars

10. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Into odontoblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
6th to 7th weeks
The stellate reticulum

11. What hard tissue is innervated by nerves?
Traumatic injury or crowding of teeth
A mineralized cylinder - the dentinal tubule
Proliferation - differentiation - morphogenesis
Dentin and alveolar bone

12. What is the cap in the cap stage?
Odontoblastic process
Tooth germ tries to divide
The enamel organ
Extra cusp due to effects on enamel organ

13. What layer serves as protection for the enamel organ?
Hereditary
The outer enamel epithelium
The ameloblasts place an acellular dental cuticle on the new enamel surface
Sphere of enamel on root

14. What are the formative cells for cementum?
Cementoblasts
Extra cusp due to effects on enamel organ
Displacement of ameloblasts to root surface
Dental tissues secreted as matrix in successive layers.

15. What is the cementum matrix called?
Bud stage
Cementoid
There are none - they are lost with eruption
The ameloblasts place an acellular dental cuticle on the new enamel surface

16. What are the clinical ramifications of enamel pearl?
Tooth germ
May be confused as calculus deposit on root
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
Odontoclasts

17. What is the primordium of the tooth?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementocytes
The tooth germ
Cementoid

18. What will the inner cells of the dental lamina differentiates into?
Alveolar bone
Arrest and reversal lines
Differentiation - proliferation - morphogenesis
The primordium of the pulp

19. What is cementogenisis?
Apposition of the cementum
Dental papilla
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Hereditary

20. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Displacement of ameloblasts to root surface
Arrest and reversal lines
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

21. What kind of cells reside in the stratum intermediate?
6th to 7th weeks
It disintegrates as the developing oral mucosa comes to line the oral cavity
Compressed layer of flat to cuboidal cells
The basement membrane

22. What is concrescence?
Dental follicle
Tall columnar cells
Enamel organ invaginates into the dental papilla
Union of root structure of two or more teeth by cementum

23. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Hereditary
Union of root structure of two or more teeth by cementum
The ectomesenchyme

24. What is tubercle?
Union of root structure of two or more teeth by cementum
Extra cusp due to effects on enamel organ
Preameloblasts
Dental follicle

25. What kind of cells occur in the outer enamel epithelium in the bell stage?
Future dentin and pulp tissue
Cuboidal cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental papilla

26. What are the etiological factors for anodontia?
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
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation - proliferation - morphogenesis
Enamel

27. What happens during the maturation stage?
A mineralized cylinder - the dentinal tubule
Dental tissues fully mineralize to their mature levels.
Cementocytes
Epithelial rests of Malassez

28. What type of tissue is enamel?
The cervical loop
Epithelial
Extra cusp due to effects on enamel organ
Proliferation

29. The stellate reticulum is located inner or outer?
Pressure on the area
Dental papilla
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
Outer

30. What are the developmental disturbances of the cap stage?
Compressed layer of flat to cuboidal cells
Dens in dente - gemination - tubercle - and fusion
Tall columnar cells
Bud stage

31. When does the tooth bud become a tooth germ?
Odontogenesis
In the cap stage
The outer cells of the dental papilla and the central cells of the dental papilla
Tooth germ tries to divide

32. What is dens in dente?
Tall columnar cells
Maturation
The dental sac
Enamel organ invaginates into the dental papilla

33. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Dental tissues secreted as matrix in successive layers.
Dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

34. Where is the enamel matrix secreted from by the ameloblasts?

35. What is the time span for initiation?
6th to 7th weeks
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The apposition of the enamel matrix
The basement membrane that seperates the enamel organ and dental papilla

36. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Alveolar bone
Union of 2 adjacent tooth germs
Hereditary

37. What do the odontoblasts do?
When the gingiva recedes and no actual tooth movement takes place
The ectomesenchyme
Cementoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

38. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementocytes
The primordium of the pulp
Cementoblasts
Enamel secreting cells (ameloblasts)

39. When does macro/microdontia occur?
The enamel organ - dental papilla - dental sac
Bud stage
The permanent molars
Cuboidal cells

40. What stage does anodontia occur?
Initiation stage
Outer
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

41. What is another name for the dental sac?
The basement membrane
Dental follicle
Common on permanent molars or cingulum of anterior teeth
Maturation

42. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Dentin secreting cells (odontoblats)
Preameloblasts
Apposition of the cementum
The outer enamel epithelium

43. What happens during the cap stage?
The enamel organ - dental papilla - dental sac
Tooth germ tries to divide
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.
Osteoblasts

44. How is the reduced enamel epithelium created?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementoblasts
The cementum - PDL - and alveolar bone
The enamel organ is compressed

45. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Osteoblasts
Initiation
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

46. What is the structure responsible for root development?
A bilayer rim that consists only IEE and OEE
The enamel organ
The apposition of the enamel matrix
The cervical loop

47. What is the embryological background for dentin - cementum and alveolar bone?
Bud stage
Trauma - pressure or metabolic disease
The bud stage
Dental papilla

48. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The cervical loop
Enamel organ
The dental sac
Only dentinal tubules with processes

49. 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
Initiation
6th to 7th weeks
Into odontoblasts

50. What is anodontia?
Future dentin and pulp tissue
Bud stage
Absence of single or multiple teeth
May be confused as calculus deposit on root