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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 time span for the bud stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
8th week
Osteocytes
Dental tissues secreted as matrix in successive layers.

2. What is the cap in the cap stage?
May be confused as calculus deposit on root
Enamel
The enamel organ
Absence of single or multiple teeth

3. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Epithelial rests of Malassez
The basement membrane
Tooth germ
May be confused as calculus deposit on root

4. What type of tissue is enamel?
Compressed layer of flat to cuboidal cells
Dental tissues fully mineralize to their mature levels.
Epithelial
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

5. What hard tissue is can not have tissue formation after eruption?
Dentin secreting cells (odontoblats)
Enamel
The basement membrane
Odontoblastic process

6. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Maturation
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

7. What is cementogenisis?
Enamel organ
The enamel organ
Connective
Apposition of the cementum

8. What processes are involved with the apposition stage?
Absence of single or multiple teeth
Compressed layer of flat to cuboidal cells
Induction - proliferation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

9. What kind of cells occur in the outer enamel epithelium in the bell stage?
Hereditary
The enamel organ
Cuboidal cells
May be confused as calculus deposit on root

10. What happens during the appositional stage?
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
Dental tissues fully mineralize to their mature levels.
The enamel organ
The enamel - dentin - and cementum are secreted in successive layers

11. Do odontoblasts start their secretion of matrix before the ameloblasts?
Alveolar bone
Commonly involves permanent maxillary lateral incisor and 3rd molars
9th to 10th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

12. Where does the primordium of the permanent dentition develop?
Cementoblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Induction - proliferation
Induction

13. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The basement membrane
Osteoblasts
Inner
Dental papilla

14. What are the etiological factors for fusion?
The actual vertical movement of the tooth
Initiation stage
Pressure on the area
11th to 12th weeks

15. What are supernumerary teeth?
Alveolar bone
Development of one or more extra teeth
The dental lamina
Pressure on the area

16. What is the primordium of the tooth?
Dentin secreting cells (odontoblats)
The tooth germ
Preameloblasts
May be confused as calculus deposit on root

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

18. What are the odontoblastic processes is contained in what?
The cervical loop
8th week
The enamel organ
A mineralized cylinder - the dentinal tubule

19. What are the processes involved in the cap stage?
Lines of Retzuis
Proliferation - differentiation - morphogenesis
Union of 2 adjacent tooth germs
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

20. Where is the enamal organ originally derived from?
A bilayer rim that consists only IEE and OEE
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectoderm
The dental sac

21. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Cementocytes
Induction - proliferation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Osteoblasts

22. When does macro/microdontia occur?
The tooth germ
The basement membrane that seperates the enamel organ and dental papilla
Enamel pearl - enamel dysplasia - and concresence
Bud stage

23. What is concrescence?
Union of root structure of two or more teeth by cementum
The ameloblasts place an acellular dental cuticle on the new enamel surface
Commonly involves permanent maxillary lateral incisor and 3rd molars
Trauma - pressure or metabolic disease

24. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Hereditary in localized form. endocrine dysfunction is complete
Odontoclasts
Common with permanent maxillary molars

25. The preameloblasts induce dental papilla cells to differentiate into what?
The actual vertical movement of the tooth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Bud stage
Into odontoblasts

26. What are the incremental lines for enamel?
The dental sac
The apposition of the enamel matrix
Lines of Retzuis
Into odontoblasts

27. What is the time span for the cap stage?
Absence of single or multiple teeth
9th to 10th weeks
Outer
Abnormally large teeth

28. What are the incremental lines for dentin?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Imbrication lines of von Ebner
Hereditary

29. What are the clinical ramifications of enamel dysplasia?
Cementoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
There is unequal growth in different parts of the tooth bud
Extra cusp due to effects on enamel organ

30. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Imbrication lines of von Ebner
Tall columnar cells
Odontoblasts

31. 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
Enamel organ
Maturation
Pressure on the area

32. What are the mature cells for enamel?
4 types
There are none - they are lost with eruption
Morphogenesis
The apposition of the enamel matrix

33. What is the structure responsible for root development?
Cementocytes
The cervical loop
Hereditary
The ameloblasts place an acellular dental cuticle on the new enamel surface

34. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Faulty development of enamel from interference involving ameloblasts
Maturation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

35. What is microdontia?
Sphere of enamel on root
The dental lamina
Abnormally small teeth
During the cap stage

36. What is the time span for the bell stage?
Dental tissues fully mineralize to their mature levels.
Common with permanent maxillary molars
The basement membrane
11th to 12th weeks

37. What are the formative cells for dentin?
The stellate reticulum
Odontoblasts
Faulty development of enamel from interference involving ameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

38. The oral epithelium is induced by the ectomesenchyme to produce what?
Dental papilla
Trauma - pressure or metabolic disease
Extra cusp due to effects on enamel organ
The dental lamina

39. What is the site for the future dentioenamel junction?
Cementoblasts
Hereditary in localized form. endocrine dysfunction is complete
Tooth germ tries to divide
The basement membrane that seperates the enamel organ and dental papilla

40. What is macrodontia?
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
Abnormally large teeth
Enamel organ
Cementocytes

41. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Enamel secreting cells (ameloblasts)
Into 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

42. What are the clinical ramifications of concrescence?
Cementoblasts
There is unequal growth in different parts of the tooth bud
Common with permanent maxillary molars
Odontoblasts

43. How many types of cells are found in the enamel organ in the bell stage?
Initiation
Extra cusp due to effects on enamel organ
The enamel organ
4 types

44. How is the dentinocemental junction formed?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
It disintegrates as the developing oral mucosa comes to line the oral cavity
As a result of the apposition of cementum over dentin
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

45. What are the etiological factors of tubercle?
The ectomesenchyme
Cementoid
Trauma - pressure or metabolic disease
The ameloblasts place an acellular dental cuticle on the new enamel surface

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

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47. What stage does supernumerary teeth occur?
The cementum - PDL - and alveolar bone
Initiation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
8th week

48. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Proliferation - differentiation - morphogenesis
Dentin secreting cells (odontoblats)
Enamel secreting cells (ameloblasts)

49. Which layer in the bell stage has star shaped cells?
The stellate reticulum
The outer cells of the dental papilla and the central cells of the dental papilla
Displacement of ameloblasts to root surface
Preameloblasts

50. What are the etiological factors of concrescence?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The enamel organ - dental papilla - dental sac
Proliferation
Traumatic injury or crowding of teeth

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Dentistry Tooth Development And Eruption

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