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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 clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Proliferation - differentiation - morphogenesis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The basement membrane

2. What are the clinical ramifications of fusion?
There are none - they are lost with eruption
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

3. What is another name for the dental sac?
Faulty development of enamel from interference involving ameloblasts
Dental follicle
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Morphogenesis

4. What is concrescence?
The ameloblasts
Initiation
The ectomesenchyme
Union of root structure of two or more teeth by cementum

5. What are the formative cells for cementum?
Cementoblasts
There is unequal growth in different parts of the tooth bud
Displacement of ameloblasts to root surface
Epithelial rests of Malassez

6. What are the formative cells for dentin?
Odontoblasts
Only dentinal tubules with processes
Cuboidal cells
Development of one or more extra teeth

7. What type of tissue is enamel?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Union of 2 adjacent tooth germs
The ameloblasts place an acellular dental cuticle on the new enamel surface
Epithelial

8. What are the cell layers found in the enamel organ in the bell stage?
Enamel organ invaginates into the dental papilla
The primordium of the pulp
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementoblasts

9. 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
Hereditary in localized form. endocrine dysfunction is complete
Abnormally small teeth
The dental sac

10. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
6th to 7th weeks
The outer enamel epithelium
11th to 12th weeks

11. What is anodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
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.
Absence of single or multiple teeth
Faulty development of enamel from interference involving ameloblasts

12. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The enamel organ - dental papilla - dental sac
Cementoblasts
The ameloblasts
The ectomesenchyme

13. What is cementogenisis?
Faulty development of enamel from interference involving ameloblasts
Into odontoblasts
Apposition of the cementum
The ectomesenchyme

14. What is matrix?
Oral epithelium
The basement membrane
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental lamina

15. What are the etiological factors for fusion?
Absence of single or multiple teeth
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
Odontoblastic process
Pressure on the area

16. What is the main process involved in the bud stage?
Faulty development of enamel from interference involving ameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel - dentin - and cementum are secreted in successive layers
Proliferation

17. What is the cementum matrix called?
Odontoblastic process
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
Cementoid
The primordium of the pulp

18. Active eruption
Future dentin and pulp tissue
Imbrication lines of von Ebner
Hereditary in localized form. endocrine dysfunction is complete
The actual vertical movement of the tooth

19. What processes are involved in the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
The ectomesenchyme
Differentiation - proliferation - morphogenesis
Enamel pearl - enamel dysplasia - and concresence

20. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dentin secreting cells (odontoblats)
Enamel secreting cells (ameloblasts)
Abnormally large teeth

21. What are the incremental lines for dentin?
The ectomesenchyme
Enamel organ invaginates into the dental papilla
11th to 12th weeks
Imbrication lines of von Ebner

22. What are succedaneous teeth?
Proliferation - differentiation - morphogenesis
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
In the cap 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

23. What wll the inner enamel epithelium differentiate into?
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
Proliferation
The ectomesenchyme
Enamel secreting cells (ameloblasts)

24. What stage does the dental tissues subsequently fully mineralize
Maturation
Sphere of enamel on root
Common with permanent maxillary molars
Enamel pearl - enamel dysplasia - and concresence

25. What are the clinical ramifications?
4 types
Preameloblasts
A mineralized cylinder - the dentinal tubule
Common on permanent molars or cingulum of anterior teeth

26. The stellate reticulum is located inner or outer?
Enamel pearl - enamel dysplasia - and concresence
Outer
The enamel organ is compressed
Initiation stage

27. What happens during the bell stage?
Enamel secreting cells (ameloblasts)
Imbrication lines of von Ebner
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Alveolar bone

28. What are the clinical ramifications of enamel pearl?
There are none - they are lost with eruption
May be confused as calculus deposit on root
The ectomesenchyme
The basement membrane

29. What will the outer cells of the dental lamina differentiate into?
Enamel secreting cells (ameloblasts)
Initiation stage
Dentin secreting cells (odontoblats)
Abnormally small teeth

30. Tooth development
Odontogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Maturation
The cervical loop

31. What is the embryological background for dentin - cementum and alveolar bone?
A mineralized cylinder - the dentinal tubule
Dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Only dentinal tubules with processes

32. Where is the enamal organ originally derived from?
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.
The ectoderm
Initiation stage
The stellate reticulum

33. What is fusion?
9th to 10th weeks
Union of 2 adjacent tooth germs
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Differentiation

34. What hard tissue is innervated by nerves?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Induction - proliferation
Dentin and alveolar bone
Abnormally small teeth

35. What are the etiological factors of concrescence?
Differentiation - proliferation - morphogenesis
The ectomesenchyme
The basement membrane
Traumatic injury or crowding of teeth

36. What hard tissue has vascularity?
Bud stage
Alveolar bone
Morphogenesis
The enamel organ - dental papilla - dental sac

37. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
The bud stage
Union of root structure of two or more teeth by cementum
Inner

38. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Initiation stage
8th week
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontoclasts

39. What is dens in dente?
Sphere of enamel on root
Enamel organ invaginates into the dental papilla
Oral epithelium
Extra cusp due to effects on enamel organ

40. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
During the cap stage
As a result of the apposition of cementum over dentin
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

41. 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
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Common with permanent maxillary molars
Enamel pearl - enamel dysplasia - and concresence

42. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Cementocytes
Differentiation
Odontoblastic process
The basement membrane

43. What hard tissue is can not have tissue formation after eruption?
Enamel organ invaginates into the dental papilla
Enamel
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

44. What are the clinical ramifications of concrescence?
Pressure on the area
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
Cementocytes
Common with permanent maxillary molars

45. What is microdontia?
There is unequal growth in different parts of the tooth bud
Union of 2 adjacent tooth germs
Common on permanent molars or cingulum of anterior teeth
Abnormally small teeth

46. What is tubercle?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Into odontoblasts
Extra cusp due to effects on enamel organ
The ameloblasts

47. What is the time span for initiation?
Cementoblasts
Dental papilla
6th to 7th weeks
Sphere of enamel on root

48. What are the clinical ramifications of anodontia?
Maturation
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementocytes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

49. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Arrest and reversal lines

50. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
The enamel organ
A bilayer rim that consists only IEE and OEE
The outer enamel epithelium

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Dentistry Tooth Development And Eruption

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