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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 are the clinical ramifications of enamel pearl?
Dental follicle
Differentiation - proliferation - morphogenesis
May be confused as calculus deposit on root
Cementoid

2. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop
There is unequal growth in different parts of the tooth bud
Traumatic injury or crowding of teeth

3. What are the incremental lines for enamel?
Cementocytes
Morphogenesis
Lines of Retzuis
Differentiation

4. What are the etiological factors for supernumerary teeth?
The ectomesenchyme
Extra cusp due to effects on enamel organ
Hereditary
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

5. What is the cap in the cap stage?
Bud stage
The outer cells of the dental papilla and the central cells of the dental papilla
The enamel organ
Epithelial rests of Malassez

6. What stage does anodontia occur?
Enamel secreting cells (ameloblasts)
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Initiation stage
The ectomesenchyme

7. What are the clinical ramifications of gemination?

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8. What will the inner cells of the dental lamina differentiates into?
Dental tissues fully mineralize to their mature levels.
Absence of single or multiple teeth
The primordium of the pulp
Morphogenesis

9. What are the processes involved 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
Proliferation - differentiation - morphogenesis
Dens in dente - gemination - tubercle - and fusion
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

10. What is another name for the dental sac?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Apposition of the cementum
Dental follicle
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.

11. What are the clinical ramifications of concrescence?
Connective
The ectomesenchyme
Common with permanent maxillary molars
Tooth germ

12. What is dens in dente?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Connective
Enamel organ invaginates into the dental papilla
Hereditary

13. What happens during the bell stage?
Pressure on the area
Development of one or more extra teeth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

14. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The basement membrane that seperates the enamel organ and dental papilla
Dental tissues secreted as matrix in successive layers.
The ameloblasts
Cementoid

15. What stage does supernumerary teeth occur?
Induction
Initiation
Trauma - pressure or metabolic disease
Maturation

16. What hard tissue is can not have tissue formation after eruption?
Dentin and alveolar bone
Enamel
Alveolar bone
Enamel secreting cells (ameloblasts)

17. What are the etiological factors for dens in dente and gemination?
Hereditary
A mineralized cylinder - the dentinal tubule
The enamel organ is compressed
The ectomesenchyme

18. What is the main process involved in the bud stage?
Proliferation
In the cap stage
The actual vertical movement of the tooth
Apposition of the cementum

19. What kind of cells occur in the inner enamel epithelium?
Common with permanent maxillary molars
The ameloblasts place an acellular dental cuticle on the new enamel surface
Tall columnar cells
Enamel organ invaginates into the dental papilla

20. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The bud stage
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental follicle
It disintegrates as the developing oral mucosa comes to line the oral cavity

21. What is the main process involved in initiation?
Local or systemic or hereditary
The enamel organ is compressed
The ectomesenchyme - which was influenced by the neural crest cells
Induction

22. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Common with permanent maxillary molars
The ameloblasts
Cementoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface

23. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Cementoblasts
In the cap stage
Extra cusp due to effects on enamel organ

24. When does macro/microdontia occur?
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
Common on permanent molars or cingulum of anterior teeth
Bud stage
Enamel organ invaginates into the dental papilla

25. What happens during the maturation stage?
Local or systemic or hereditary
Development of one or more extra teeth
Dental tissues fully mineralize to their mature levels.
Arrest and reversal lines

26. What happens during the bud stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Initiation stage

27. What are the etiological factors of tubercle?
Abnormally small teeth
Imbrication lines of von Ebner
Trauma - pressure or metabolic disease
Union of 2 adjacent tooth germs

28. What type of tissue is enamel?
Epithelial
The enamel organ is compressed
The basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

29. What is the process involved in the maturation stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Maturation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental sac

30. What is the predominate process of the cap stage?
The stellate reticulum
Arrest and reversal lines
Proliferation
Morphogenesis

31. What are the clinical ramifications?
Outer
Absence of single or multiple teeth
The outer enamel epithelium
Common on permanent molars or cingulum of anterior teeth

32. Which teeth are nonsuccedaneous?
Cementocytes
The ectomesenchyme
The permanent 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

33. How is the reduced enamel epithelium created?
The enamel organ is compressed
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Lines of Retzuis
Compressed layer of flat to cuboidal cells

34. What is gemination?
Tooth germ tries to divide
Traumatic injury or crowding of teeth
Dentin and alveolar bone
11th to 12th weeks

35. 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
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
4 types
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.

36. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Development of one or more extra teeth
Induction - proliferation
Odontoblastic process

37. What type of tissue is dentin - cementum - and alveolar bone?
The basement membrane that seperates the enamel organ and dental papilla
A bilayer rim that consists only IEE and OEE
Connective
Bud stage

38. What kind of cells occur in the outer enamel epithelium in the bell stage?
The permanent molars
May be confused as calculus deposit on root
Cuboidal cells
Maturation

39. What is the embryological background for enamel?
Cementocytes
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
Enamel organ
Connective

40. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementoblasts
A bilayer rim that consists only IEE and OEE
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

41. What will the dental papilla eventually form?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Future dentin and pulp tissue
Odontogenesis
In the cap stage

42. What are the formative cells for dentin?
The outer enamel epithelium
Arrest and reversal lines
Odontoblasts
Dentin and alveolar bone

43. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
9th to 10th weeks
Odontoblastic process
Into odontoblasts
Traumatic injury or crowding of teeth

44. What is amelogenisis?
The actual vertical movement of the tooth
Union of 2 adjacent tooth germs
The primordium of the pulp
The apposition of the enamel matrix

45. What is the time span for the bell stage?
The enamel organ - dental papilla - dental sac
11th to 12th weeks
Hereditary
Dental tissues fully mineralize to their mature levels.

46. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Maturation

47. What is the site for the future dentioenamel junction?
The bud stage
The basement membrane that seperates the enamel organ and dental papilla
The enamel - dentin - and cementum are secreted in successive layers
Union of root structure of two or more teeth by cementum

48. What is microdontia?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
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 pearl - enamel dysplasia - and concresence
Abnormally small teeth

49. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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

50. What does the cervical loop consist of?
The ectoderm
A bilayer rim that consists only IEE and OEE
Ameloblasts
Enamel pearl - enamel dysplasia - and concresence