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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 are the mature cells for cementum?
11th to 12th weeks
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementocytes
Development of one or more extra teeth

2. What is the structure responsible for root development?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop
8th week
Faulty development of enamel from interference involving ameloblasts

3. When does the tooth bud become a tooth germ?
In the cap stage
The basement membrane
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
There are none - they are lost with eruption

4. Active eruption
Tall columnar cells
Osteocytes
The actual vertical movement of the tooth
Enamel secreting cells (ameloblasts)

5. What happens during the cap stage?
The dental sac
The stellate reticulum
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.
Enamel secreting cells (ameloblasts)

6. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
The stellate reticulum
Compressed layer of flat to cuboidal cells
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.

7. What processes are involved with the apposition stage?
Extra cusp due to effects on enamel organ
Induction - proliferation
The dental lamina
Outer

8. Passive eruption
Differentiation - proliferation - morphogenesis
Osteocytes
Dental tissues secreted as matrix in successive layers.
When the gingiva recedes and no actual tooth movement takes place

9. What is fusion?
Enamel organ invaginates into the dental papilla
Cementoblasts
Union of 2 adjacent tooth germs
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

10. What is the process involved in the maturation stage?
Odontogenesis
Maturation
Dental papilla
The dental sac

11. What are the development disturbances of the apposition and maturation stages?
Morphogenesis
The enamel organ - dental papilla - dental sac
Enamel pearl - enamel dysplasia - and concresence
Preameloblasts

12. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Osteoblasts
During the cap stage
The primordium of the pulp

13. What is another name for the dental sac?
Dental follicle
Oral epithelium
The cervical loop
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

14. What are the clinical ramifications of enamel dysplasia?
The dental sac
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Proliferation
Epithelial rests of Malassez

15. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
There is unequal growth in different parts of the tooth bud
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ectomesenchyme - which was influenced by the neural crest cells
Odontoblastic process

16. What hard tissue has vascularity?
The actual vertical movement of the tooth
Odontoblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Alveolar bone

17. The preameloblasts induce dental papilla cells to differentiate into what?
The enamel organ - dental papilla - dental sac
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Into odontoblasts
In the cap stage

18. What is the predominate process of the cap stage?
Morphogenesis
The basement membrane
The ectoderm
The enamel - dentin - and cementum are secreted in successive layers

19. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Abnormally large teeth
Imbrication lines of von Ebner
8th week

20. When does the process of root development take place?
Abnormally small teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The cervical loop

21. What hard tissue is can not have tissue formation after eruption?
Cementoblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Tooth germ tries to divide
Enamel

22. What is the time span for the cap stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
9th to 10th weeks
Tooth germ
In the cap stage

23. What is gemination?
Hereditary
Tooth germ tries to divide
The bud stage
Inner

24. Where is the enamal organ originally derived from?
Alveolar bone
The ectoderm
Dental papilla
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

25. What hard tissue is innervated by nerves?
Abnormally large teeth
The outer enamel epithelium
Dentin and alveolar bone
Dental tissues fully mineralize to their mature levels.

26. The stratum intermediate is located inner or outer?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Extra cusp due to effects on enamel organ
Inner
Proliferation - differentiation - morphogenesis

27. What is concrescence?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Union of root structure of two or more teeth by cementum
Lines of Retzuis
Dentin and alveolar bone

28. What will the dental papilla eventually form?
The ectomesenchyme
Proliferation
Future dentin and pulp tissue
9th to 10th weeks

29. What is the site for the future dentioenamel junction?
Dental follicle
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Hereditary in localized form. endocrine dysfunction is complete
The basement membrane that seperates the enamel organ and dental papilla

30. What type of tissue is dentin - cementum - and alveolar bone?
In the cap stage
Connective
8th week
Union of root structure of two or more teeth by cementum

31. What happens during the bud stage?
Proliferation - differentiation - morphogenesis
Sphere of enamel on root
Cementoblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

32. 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
9th to 10th weeks
Epithelial rests of Malassez
Inner

33. What is dens in dente?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel organ invaginates into the dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ameloblasts

34. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The cementum - PDL - and alveolar bone
Maturation
The cervical loop

35. 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
Abnormally large teeth
When the gingiva recedes and no actual tooth movement takes place
The basement membrane

36. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
The enamel organ - dental papilla - dental sac
There is unequal growth in different parts of the tooth bud
Dental tissues secreted as matrix in successive layers.

37. What is microdontia?
When the gingiva recedes and no actual tooth movement takes place
Dental follicle
Abnormally small teeth
Dentin secreting cells (odontoblats)

38. What happens during initiation?
Union of 2 adjacent tooth germs
Dental tissues secreted as matrix in successive layers.
Odontoblasts
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

39. What is amelogenisis?
The apposition of the enamel matrix
Ameloblasts
The stellate reticulum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

40. What are the formative cells for alveolar bone?
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
Extra cusp due to effects on enamel organ
Induction - proliferation
Osteoblasts

41. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The ameloblasts place an acellular dental cuticle on the new enamel surface
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontogenesis
Preameloblasts

42. What is the time span for the bud stage?
8th week
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
Dentin secreting cells (odontoblats)
Dental papilla

43. Where is the dental sac originally derived from?
Bud stage
Enamel organ
The ectomesenchyme
In the cap stage

44. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Cementocytes
When the gingiva recedes and no actual tooth movement takes place
9th to 10th weeks
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

45. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Enamel organ
4 types
Dental tissues secreted as matrix in successive layers.

46. What is the function of the Hertwig's epithelial root sheath?
6th to 7th weeks
Osteoblasts
Maturation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

47. What will the dental sac give rise to?
Maturation
The cementum - PDL - and alveolar bone
Union of root structure of two or more teeth by cementum
Cementocytes

48. 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
The ectoderm
Proliferation - differentiation - morphogenesis
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

49. What are succedaneous teeth?
The actual vertical movement of the tooth
Differentiation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
It disintegrates as the developing oral mucosa comes to line the oral cavity

50. What are the clinical ramifications of concrescence?
Dental tissues secreted as matrix in successive layers.
Sphere of enamel on root
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Common with permanent maxillary molars

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Dentistry Tooth Development And Eruption

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