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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. What is the structure responsible for root development?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Odontogenesis
Initiation
The cervical loop

2. Where does the primordium of the permanent dentition develop?
Initiation stage
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentin and alveolar bone

3. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Outer
Dental follicle
The ameloblasts place an acellular dental cuticle on the new enamel surface
The bud stage

4. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The actual vertical movement of the tooth
Sphere of enamel on root
Odontoblasts
The outer cells of the dental papilla and the central cells of the dental papilla

5. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
There are none - they are lost with eruption
The actual vertical movement of the tooth
The basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface

6. The preameloblasts induce dental papilla cells to differentiate into what?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Common with permanent maxillary molars
Into odontoblasts
The enamel - dentin - and cementum are secreted in successive layers

7. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Hereditary in localized form. endocrine dysfunction is complete
Alveolar bone
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ameloblasts

8. What are supernumerary teeth?
Trauma - pressure or metabolic disease
Development of one or more extra teeth
Displacement of ameloblasts to root surface
A mineralized cylinder - the dentinal tubule

9. What are the clinical ramifications of fusion?
Local or systemic or hereditary
The outer cells of the dental papilla and the central cells of the dental papilla
Preameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

10. What are the etiological factors for enamel pearl?
Enamel organ
Hereditary
Displacement of ameloblasts to root surface
Absence of single or multiple teeth

11. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The stellate reticulum
Epithelial rests of Malassez
There is unequal growth in different parts of the tooth bud
The bud stage

12. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Common on permanent molars or cingulum of anterior teeth
The enamel organ
During the cap stage

13. What is another name for the dental sac?
Common with permanent maxillary 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
Local or systemic or hereditary
Dental follicle

14. Where is the enamal organ originally derived from?
Bud stage
The ectoderm
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Preameloblasts

15. The oral epithelium is induced by the ectomesenchyme to produce what?
Lines of Retzuis
The dental lamina
Cementoid
There is unequal growth in different parts of the tooth bud

16. What are the incremental lines for dentin?
Dental follicle
Dental tissues secreted as matrix in successive layers.
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Imbrication lines of von Ebner

17. What happens during the maturation stage?
Dental follicle
Cuboidal cells
During the cap stage
Dental tissues fully mineralize to their mature levels.

18. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Maturation
May be confused as calculus deposit on root
Enamel secreting cells (ameloblasts)

19. What are the formative cells for dentin?
Odontoblasts
Cementoblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementocytes

20. What are the etiological factors for fusion?
The outer cells of the dental papilla and the central cells of the dental papilla
The stellate reticulum
Pressure on the area
Odontogenesis

21. What is cementogenisis?
Apposition of the cementum
Commonly involves permanent maxillary lateral incisor and 3rd molars
The dental lamina
The cementum - PDL - and alveolar bone

22. What is the time span for the cap stage?
The apposition of the enamel matrix
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
9th to 10th weeks
Osteocytes

23. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Maturation
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental papilla
The ectoderm

24. What is dens in dente?
Differentiation - proliferation - morphogenesis
Initiation
Induction - proliferation
Enamel organ invaginates into the dental papilla

25. What are the etiological factors for dens in dente and gemination?
8th week
The primordium of the pulp
Hereditary
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

26. Where is the dental sac originally derived from?
Bud stage
Initiation stage
The outer cells of the dental papilla and the central cells of the dental papilla
The ectomesenchyme

27. What are the etiological factors for micro/macrodontia?
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.
Dental follicle
Hereditary in localized form. endocrine dysfunction is complete

28. What is the time span for the bud stage?
The stellate reticulum
8th week
Hereditary
Future dentin and pulp tissue

29. What is microdontia?
Induction - proliferation
Abnormally small teeth
Enamel
Extra cusp due to effects on enamel organ

30. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Odontoclasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

31. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Compressed layer of flat to cuboidal cells
Traumatic injury or crowding of teeth
11th to 12th weeks
Preameloblasts

32. What is an enamel pearl?
Enamel
Sphere of enamel on root
Apposition of the cementum
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

33. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Tall columnar cells
9th to 10th weeks

34. When does dens in dente occur?
The enamel organ is compressed
During the cap stage
Proliferation - differentiation - morphogenesis
Dental tissues secreted as matrix in successive layers.

35. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Union of 2 adjacent tooth germs

36. What are the mature cells for cementum?
Abnormally small teeth
4 types
Cementocytes
Only dentinal tubules with processes

37. What happens during initiation?
Oral epithelium
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
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The actual vertical movement of the tooth

38. What processes are involved in the bell stage?
Oral epithelium
Differentiation - proliferation - morphogenesis
Compressed layer of flat to cuboidal cells
Dental tissues fully mineralize to their mature levels.

39. What is the main process involved in initiation?
The dental lamina
Initiation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Induction

40. What are the cell layers found in the enamel organ in the bell stage?
Enamel organ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental tissues fully mineralize to their mature levels.
Cementocytes

41. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
The stellate reticulum
Dental papilla
Maturation

42. What stage does supernumerary teeth occur?
Cuboidal cells
May be confused as calculus deposit on root
Initiation
Union of 2 adjacent tooth germs

43. What are succedaneous teeth?
Connective
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.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

44. What are the formative cells for enamel?
The cementum - PDL - and alveolar bone
Ameloblasts
The ectomesenchyme
Enamel organ

45. 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
Odontoclasts
The enamel - dentin - and cementum are secreted in successive layers
The cervical loop

46. Active eruption
6th to 7th weeks
Common on permanent molars or cingulum of anterior teeth
Extra cusp due to effects on enamel organ
The actual vertical movement of the tooth

47. What stage does the dental tissues subsequently fully mineralize
Hereditary
8th week
Maturation
Displacement of ameloblasts to root surface

48. What is concrescence?
Dental tissues secreted as matrix in successive layers.
Initiation stage
Union of root structure of two or more teeth by cementum
Preameloblasts

49. What is the embryological background for dentin - cementum and alveolar bone?
Common with permanent maxillary molars
Union of 2 adjacent tooth germs
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dental papilla

50. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Cementoblasts
Pressure on the area
Initiation

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Dentistry Tooth Development And Eruption

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