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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 will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Epithelial rests of Malassez
Differentiation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

2. What is anodontia?
Tooth germ tries to divide
Absence of single or multiple teeth
Enamel pearl - enamel dysplasia - and concresence
The enamel organ

3. What is the outer portion of the ectoderm in the initiation stage?
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
Oral epithelium
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Development of one or more extra teeth

4. What are the clinical ramifications of fusion?
Cementoblasts
The ectomesenchyme
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

5. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer cells of the dental papilla and the central cells of the dental papilla
Cementoid
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

6. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The enamel - dentin - and cementum are secreted in successive layers
The basement membrane
Enamel pearl - enamel dysplasia - and concresence

7. What are the etiological factors for supernumerary teeth?
Hereditary
Dentin and alveolar bone
Trauma - pressure or metabolic disease
Union of root structure of two or more teeth by cementum

8. What are the mature cells for alveolar bone?
Pressure on the area
Osteocytes
Dental papilla
The permanent molars

9. What does the cervical loop consist of?
Union of 2 adjacent tooth germs
A bilayer rim that consists only IEE and OEE
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Common on permanent molars or cingulum of anterior teeth

10. Passive eruption
Morphogenesis
Osteocytes
When the gingiva recedes and no actual tooth movement takes place
Commonly involves permanent maxillary lateral incisor and 3rd molars

11. What happens during the apposition stage?
Lines of Retzuis
Dental tissues secreted as matrix in successive layers.
The bud stage
May be confused as calculus deposit on root

12. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Epithelial rests of Malassez
May be confused as calculus deposit on root
Common with permanent maxillary molars
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

13. What will the dental papilla eventually form?
Dental follicle
Future dentin and pulp tissue
The actual vertical movement of the tooth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

14. What are the major components of the tooth germ?
Cementoblasts
The enamel organ - dental papilla - dental sac
Extra cusp due to effects on enamel organ
Hereditary

15. The oral epithelium is induced by the ectomesenchyme to produce what?
Dental papilla
Only dentinal tubules with processes
The dental lamina
Maturation

16. What processes are involved with the apposition stage?
Induction - proliferation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoblasts
Union of 2 adjacent tooth germs

17. What are the etiological factors for enamel pearl?
Into odontoblasts
There is unequal growth in different parts of the tooth bud
Displacement of ameloblasts to root surface
Epithelial

18. What are the etiological factors of concrescence?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Traumatic injury or crowding of teeth
The stellate reticulum
When the gingiva recedes and no actual tooth movement takes place

19. What are the clinical ramifications of gemination?

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20. Where is the dental sac originally derived from?
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
The ectomesenchyme
A bilayer rim that consists only IEE and OEE
Extra cusp due to effects on enamel organ

21. What is the cementum matrix called?
The enamel organ
Cementoid
The ectomesenchyme
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

22. What is the time span for initiation?
6th to 7th weeks
Odontogenesis
The dental lamina
Initiation

23. How is the dentinocemental junction formed?
Induction - proliferation
As a result of the apposition of cementum over dentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The primordium of the pulp

24. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Absence of single or multiple teeth
Future dentin and pulp tissue
8th week
Tooth germ

25. What are the incremental lines for dentin?
Traumatic injury or crowding of teeth
Lines of Retzuis
Oral epithelium
Imbrication lines of von Ebner

26. What is the time span for the bell stage?
11th to 12th weeks
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Future dentin and pulp tissue
The enamel organ

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

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28. What stage does supernumerary teeth occur?
Initiation
Cementocytes
8th week
Osteocytes

29. What type of tissue is dentin - cementum - and alveolar bone?
Cementoblasts
Connective
The actual vertical movement of the tooth
Inner

30. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Traumatic injury or crowding of teeth
Dental papilla
Outer

31. What type of tissue is enamel?
Imbrication lines of von Ebner
The outer cells of the dental papilla and the central cells of the dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial

32. What are the incremental lines for cementum and alveolar bone?
The enamel - dentin - and cementum are secreted in successive layers
The enamel organ is compressed
Arrest and reversal lines
Enamel organ invaginates into the dental papilla

33. When does dens in dente occur?
The ectomesenchyme
The cementum - PDL - and alveolar bone
Tooth germ
During the cap stage

34. What are the clinical ramifications of concrescence?
The permanent molars
The enamel organ
Initiation stage
Common with permanent maxillary molars

35. What is the predominate process of the cap stage?
Morphogenesis
Cementocytes
Enamel organ
Enamel pearl - enamel dysplasia - and concresence

36. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Dental tissues fully mineralize to their mature levels.
The ameloblasts place an acellular dental cuticle on the new enamel surface
Sphere of enamel on root

37. What is macrodontia?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dental tissues fully mineralize to their mature levels.
Differentiation - proliferation - morphogenesis
Abnormally large teeth

38. What happens when the reduced enamel epithelium is created?
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
Lines of Retzuis
The enamel organ
The dental sac

39. 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
Osteoblasts
During the cap stage
The outer enamel epithelium

40. What are the clinical ramifications of micro/macrodontia?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental tissues secreted as matrix in successive layers.
Dentin secreting cells (odontoblats)

41. What are entrapped cementoblasts called?
The primordium of the pulp
Common with permanent maxillary molars
Cementocytes
The actual vertical movement of the tooth

42. What will the dental sac give rise to?
Common with permanent maxillary molars
Outer
Development of one or more extra teeth
The cementum - PDL - and alveolar bone

43. What is the main process involved in initiation?
Odontoclasts
Oral epithelium
Induction
Trauma - pressure or metabolic disease

44. What is dens in dente?
Dens in dente - gemination - tubercle - and fusion
Enamel organ invaginates into the dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ameloblasts

45. What is the process involved in the maturation stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel - dentin - and cementum are secreted in successive layers
The basement membrane that seperates the enamel organ and dental papilla
Maturation

46. How many types of cells are found in the enamel organ in the bell stage?
Cementoblasts
Dental papilla
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
4 types

47. What are the clinical ramifications of enamel dysplasia?
During the cap stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

48. The stratum intermediate is located inner or outer?
Inner
Oral epithelium
Development of one or more extra teeth
Differentiation

49. What is the site for the future dentioenamel junction?
Odontoblasts
Maturation
The basement membrane that seperates the enamel organ and dental papilla
Induction - proliferation

50. What is cementogenisis?
Maturation
Apposition of the cementum
Extra cusp due to effects on enamel organ
Cementoid