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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 an enamel pearl?
The tooth germ
The permanent molars
Sphere of enamel on root
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

2. What is the site for the future dentioenamel junction?
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
The basement membrane that seperates the enamel organ and dental papilla
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

3. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
As a result of the apposition of cementum over dentin
Only dentinal tubules with processes
The bud stage
The outer cells of the dental papilla and the central cells of the dental papilla

4. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Connective
The tooth germ

5. What are the formative cells for cementum?
The ectomesenchyme
Cementoblasts
Cuboidal cells
Only dentinal tubules with processes

6. What stage does supernumerary teeth occur?
Osteocytes
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Initiation

7. What are the incremental lines for dentin?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Preameloblasts
Development of one or more extra teeth
Imbrication lines of von Ebner

8. When does the tooth bud become a tooth germ?
In the cap stage
Absence of single or multiple teeth
Common with permanent maxillary molars
The enamel organ

9. What is the cementum matrix called?
Abnormally small teeth
Cementoid
The tooth germ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

10. What hard tissue is can not have tissue formation after eruption?
Cementocytes
Dental follicle
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel

11. What is the embryological background for dentin - cementum and alveolar bone?
Trauma - pressure or metabolic disease
Odontoclasts
The cementum - PDL - and alveolar bone
Dental papilla

12. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
Compressed layer of flat to cuboidal cells
Displacement of ameloblasts to root surface
8th week

13. What is the time span for the bud stage?
Abnormally large teeth
11th to 12th weeks
8th week
The outer cells of the dental papilla and the central cells of the dental papilla

14. What are the formative cells for alveolar bone?
Dens in dente - gemination - tubercle - and fusion
The basement membrane
Lines of Retzuis
Osteoblasts

15. What are the clinical ramifications of concrescence?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Common with permanent maxillary molars
In the cap stage
The dental sac

16. What are the etiological factors for dens in dente and gemination?
Hereditary
The dental sac
Local or systemic or hereditary
It disintegrates as the developing oral mucosa comes to line the oral cavity

17. What is the predominate process of the cap stage?
Connective
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel secreting cells (ameloblasts)
Morphogenesis

18. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Initiation stage
Hereditary in localized form. endocrine dysfunction is complete

19. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Induction
Differentiation - proliferation - morphogenesis
It disintegrates as the developing oral mucosa comes to line the oral cavity
The ameloblasts place an acellular dental cuticle on the new enamel surface

20. Where is the enamal organ originally derived from?
The ectoderm
There is unequal growth in different parts of the tooth bud
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Compressed layer of flat to cuboidal cells

21. What wll the inner enamel epithelium differentiate into?
Hereditary in localized form. endocrine dysfunction is complete
The enamel organ - dental papilla - dental sac
Enamel secreting cells (ameloblasts)
Dentin and alveolar bone

22. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Only dentinal tubules with processes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

23. What is gemination?
Tooth germ tries to divide
It disintegrates as the developing oral mucosa comes to line the oral cavity
Enamel pearl - enamel dysplasia - and concresence
Induction - proliferation

24. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Enamel organ invaginates into the dental papilla
As a result of the apposition of cementum over dentin
Abnormally small teeth
The ameloblasts

25. What type of tissue is dentin - cementum - and alveolar bone?
The cervical loop
Ameloblasts
Connective
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

26. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Imbrication lines of von Ebner
Maturation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

27. What is the process involved in the maturation stage?
The ectomesenchyme
Development of one or more extra teeth
Dentin secreting cells (odontoblats)
Maturation

28. What kind of cells occur in the inner enamel epithelium?
Inner
Tall columnar cells
Pressure on the area
May be confused as calculus deposit on root

29. Where does the primordium of the permanent dentition develop?
Common with permanent maxillary molars
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Abnormally small teeth
Cementocytes

30. How many types of cells are found in the enamel organ in the bell stage?
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
4 types
Sphere of enamel on root
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

31. What are the clinical ramifications of enamel dysplasia?
Inner
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The basement membrane
Odontoclasts

32. What is the time span for the bell stage?
Extra cusp due to effects on enamel organ
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Osteocytes
11th to 12th weeks

33. What are the clinical ramifications?
The basement membrane
Trauma - pressure or metabolic disease
Common on permanent molars or cingulum of anterior teeth
During the cap stage

34. Active eruption
Imbrication lines of von Ebner
Lines of Retzuis
The actual vertical movement of the tooth
Odontoblasts

35. What is the function of the Hertwig's epithelial root sheath?
8th week
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ectoderm
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

36. What is the embryological background for enamel?
Cementoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental papilla
Enamel organ

37. What are the etiological factors of enamel dysplasia?
The basement membrane
Local or systemic or hereditary
Dens in dente - gemination - tubercle - and fusion
Bud stage

38. Which layer in the bell stage has star shaped cells?
Lines of Retzuis
Tall columnar cells
The stellate reticulum
Maturation

39. When does macro/microdontia occur?
The ameloblasts
Extra cusp due to effects on enamel organ
Bud stage
The apposition of the enamel matrix

40. What are the etiological factors for supernumerary teeth?
Hereditary
Initiation
Odontoblastic process
8th week

41. When does dens in dente occur?
Proliferation
Differentiation
Trauma - pressure or metabolic disease
During the cap stage

42. What kind of cells occur in the outer enamel epithelium in the bell stage?
Tall columnar cells
Enamel organ
In the cap stage
Cuboidal cells

43. Which teeth are nonsuccedaneous?
Common with permanent maxillary molars
The permanent molars
Alveolar bone
Induction

44. What is the primordium of the tooth?
The tooth germ
The stellate reticulum
Differentiation - proliferation - morphogenesis
Enamel pearl - enamel dysplasia - and concresence

45. What are the incremental lines for enamel?
Differentiation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Lines of Retzuis
Cementocytes

46. What are the mature cells for alveolar bone?
Dentin and alveolar bone
Osteocytes
Into odontoblasts
Initiation stage

47. What are the mature cells for enamel?
There are none - they are lost with eruption
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.
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The ectoderm

48. What is concrescence?
Union of root structure of two or more teeth by cementum
Hereditary
Hereditary
Tooth germ

49. What happens during the appositional stage?
The ectomesenchyme
The enamel - dentin - and cementum are secreted in successive layers
Sphere of enamel on root
Compressed layer of flat to cuboidal cells

50. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Oral epithelium
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
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.

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Dentistry Tooth Development And Eruption

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