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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 happens during the bud stage?
Cementoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Preameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

2. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Odontogenesis
Cementocytes
The outer cells of the dental papilla and the central cells of the dental papilla
The primordium of the pulp

3. What processes are involved in the bell stage?
Ameloblasts
Differentiation - proliferation - morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
In the cap stage

4. What will the inner cells of the dental lamina differentiates into?
The basement membrane that seperates the enamel organ and dental papilla
Cementoblasts
As a result of the apposition of cementum over dentin
The primordium of the pulp

5. What are the etiological factors for micro/macrodontia?
Odontoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary in localized form. endocrine dysfunction is complete
Alveolar bone

6. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
The permanent molars
Epithelial
Induction

7. What stage does supernumerary teeth occur?
When the gingiva recedes and no actual tooth movement takes place
The ameloblasts place an acellular dental cuticle on the new enamel surface
Initiation
Extra cusp due to effects on enamel organ

8. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
In the cap stage
Only dentinal tubules with processes
May be confused as calculus deposit on root
The ameloblasts

9. How is the reduced enamel epithelium created?
The basement membrane that seperates the enamel organ and dental papilla
The basement membrane
The enamel organ is compressed
The basement membrane

10. What happens when the reduced enamel epithelium is created?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

11. 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
Epithelial
Enamel secreting cells (ameloblasts)

12. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Differentiation - proliferation - morphogenesis
Pressure on the area
The ameloblasts place an acellular dental cuticle on the new enamel surface

13. What is the main process involved in initiation?
Induction
Pressure on the area
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Oral epithelium

14. What is the process involved in the maturation stage?
Maturation
The stellate reticulum
4 types
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

15. What is cementogenisis?
Dental follicle
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer enamel epithelium
Apposition of the cementum

16. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Compressed layer of flat to cuboidal cells
As a result of the apposition of cementum over dentin
Absence of single or multiple teeth

17. What is the time span for the cap stage?
The ectomesenchyme - which was influenced by the neural crest cells
Odontoclasts
11th to 12th weeks
9th to 10th weeks

18. What are the clinical ramifications of enamel dysplasia?
Odontoblastic process
There is unequal growth in different parts of the tooth bud
Pressure on the area
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

19. What layer serves as protection for the enamel organ?
Alveolar bone
The outer enamel epithelium
It disintegrates as the developing oral mucosa comes to line the oral cavity
Hereditary

20. When does the process of root development take place?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Alveolar bone
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Bud stage

21. What stage does the dental tissues subsequently fully mineralize
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Abnormally small teeth
Maturation
Absence of single or multiple teeth

22. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Development of one or more extra teeth
Common on permanent molars or cingulum of anterior teeth

23. The oral epithelium is induced by the ectomesenchyme to produce what?
Apposition of the cementum
The dental lamina
Inner
Induction - proliferation

24. What are the mature cells for dentin?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Enamel secreting cells (ameloblasts)
Bud stage
Only dentinal tubules with processes

25. What are the mature cells for enamel?
Abnormally large teeth
Outer
Common with permanent maxillary molars
There are none - they are lost with eruption

26. What are the major components of the tooth germ?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Odontogenesis
Development of one or more extra teeth
The enamel organ - dental papilla - dental sac

27. Which teeth are nonsuccedaneous?
During the cap stage
Alveolar bone
Cuboidal cells
The permanent molars

28. What are the incremental lines for enamel?
Lines of Retzuis
The outer cells of the dental papilla and the central cells of the dental papilla
Dental papilla
Enamel

29. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Abnormally small teeth
Odontoclasts
Local or systemic or hereditary
The bud stage

30. What are the clinical ramifications of gemination?

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31. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Development of one or more extra teeth
Differentiation - proliferation - morphogenesis
Future dentin and pulp tissue

32. What is microdontia?
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
Dental tissues secreted as matrix in successive layers.
Abnormally small teeth
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

33. The stratum intermediate is located inner or outer?
Inner
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dens in dente - gemination - tubercle - and fusion
The tooth germ

34. What is another name for the dental sac?
Dental follicle
Abnormally small teeth
Only dentinal tubules with processes
Alveolar bone

35. What is gemination?
Tooth germ tries to divide
Dental papilla
A mineralized cylinder - the dentinal tubule
Commonly involves permanent maxillary lateral incisor and 3rd molars

36. What are the clinical ramifications of anodontia?
Union of 2 adjacent tooth germs
Ameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementoblasts

37. What is the site for the future dentioenamel junction?
Cementoblasts
The basement membrane that seperates the enamel organ and dental papilla
Tooth germ tries to divide
4 types

38. What are the clinical ramifications of supernumerary teeth?
Sphere of enamel on root
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Epithelial
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

39. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Connective
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Commonly involves permanent maxillary lateral incisor and 3rd molars

40. In the cap stage the tooth bud does not grow - what happens?
Differentiation - proliferation - morphogenesis
Sphere of enamel on root
There is unequal growth in different parts of the tooth bud
Arrest and reversal lines

41. Tooth development
The primordium of the pulp
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.
6th to 7th weeks
Odontogenesis

42. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Outer
Maturation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

43. What are the mature cells for cementum?
There are none - they are lost with eruption
Ameloblasts
Cementocytes
Induction

44. When does macro/microdontia occur?
Bud stage
The ectomesenchyme - which was influenced by the neural crest cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Tall columnar cells

45. Where is the enamal organ originally derived from?
Tooth germ tries to divide
Union of 2 adjacent tooth germs
Dens in dente - gemination - tubercle - and fusion
The ectoderm

46. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Hereditary in localized form. endocrine dysfunction is complete
Dental papilla
The enamel organ
Cementocytes

47. What are the etiological factors for supernumerary teeth?
Hereditary
Dentin and alveolar bone
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The bud stage

48. What kind of cells reside in the stratum intermediate?
The primordium of the pulp
Compressed layer of flat to cuboidal cells
The tooth germ
There is unequal growth in different parts of the tooth bud

49. 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
Commonly involves permanent maxillary lateral incisor and 3rd molars
Oral epithelium
Only dentinal tubules with processes

50. What is the primordium of the tooth?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Extra cusp due to effects on enamel organ
The tooth germ
Tooth germ tries to divide