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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 enamel?
The enamel organ - dental papilla - dental sac
Imbrication lines of von Ebner
11th to 12th weeks
There are none - they are lost with eruption

2. When does the tooth bud become a tooth germ?
Connective
Cementocytes
The ectomesenchyme
In the cap stage

3. What is the embryological background for enamel?
The basement membrane
Future dentin and pulp tissue
Enamel organ
The permanent molars

4. What are the mature cells for alveolar bone?
Pressure on the area
Cuboidal cells
Osteocytes
Induction

5. What are the etiological factors for dens in dente and gemination?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer enamel epithelium
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Hereditary

6. What will the dental sac give rise to?
There is unequal growth in different parts of the tooth bud
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
The cementum - PDL - and alveolar bone
Future dentin and pulp tissue

7. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Preameloblasts
Enamel pearl - enamel dysplasia - and concresence
The basement membrane
Dental tissues fully mineralize to their mature levels.

8. What are the mature cells for dentin?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectomesenchyme - which was influenced by the neural crest cells
Common on permanent molars or cingulum of anterior teeth
Only dentinal tubules with processes

9. What is the time span for the cap stage?
Initiation
Dental follicle
Local or systemic or hereditary
9th to 10th weeks

10. What layer serves as protection for the enamel organ?
The stellate reticulum
Cementoblasts
Enamel
The outer enamel epithelium

11. Which layer in the bell stage has star shaped cells?
Odontogenesis
The stellate reticulum
6th to 7th weeks
Differentiation

12. What happens during the bell stage?
The outer enamel epithelium
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dental tissues secreted as matrix in successive layers.
Local or systemic or hereditary

13. What are supernumerary teeth?
Cementoblasts
Dental tissues fully mineralize to their mature levels.
Development of one or more extra teeth
The outer cells of the dental papilla and the central cells of the dental papilla

14. What is amelogenisis?
The cervical loop
Pressure on the area
Proliferation - differentiation - morphogenesis
The apposition of the enamel matrix

15. What is the time span for initiation?
Alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
6th to 7th weeks
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.

16. What is the structure responsible for root development?
A bilayer rim that consists only IEE and OEE
The dental lamina
The cervical loop
4 types

17. What else undergoes proliferation in the bud stage besides the dental lamina?
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.
Dental papilla
The ectomesenchyme
Inner

18. What are the clinical ramifications of enamel pearl?
Traumatic injury or crowding of teeth
Preameloblasts
Odontoclasts
May be confused as calculus deposit on root

19. What is the embryological background for dentin - cementum and alveolar bone?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Proliferation
In the cap stage
Dental papilla

20. What is the predominate process of the cap stage?
Morphogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface
The ectomesenchyme
The basement membrane

21. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementoblasts
A mineralized cylinder - the dentinal tubule
Differentiation - proliferation - morphogenesis

22. What processes are involved with the apposition stage?
Maturation
Induction - proliferation
Connective
Inner

23. What are the etiological factors for enamel pearl?
The bud stage
Displacement of ameloblasts to root surface
Ameloblasts
Odontoblasts

24. What kind of cells occur in the outer enamel epithelium in the bell stage?
Union of 2 adjacent tooth germs
A mineralized cylinder - the dentinal tubule
Cuboidal cells
Imbrication lines of von Ebner

25. What is enamel dysplasia?
Compressed layer of flat to cuboidal cells
The actual vertical movement of the tooth
As a result of the apposition of cementum over dentin
Faulty development of enamel from interference involving ameloblasts

26. 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
Local or systemic or hereditary
The ectomesenchyme - which was influenced by the neural crest cells
Future dentin and pulp tissue

27. What happens during initiation?
Morphogenesis
Imbrication lines of von Ebner
Tooth germ tries to divide
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

28. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
11th to 12th weeks
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The dental sac

29. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Bud stage
The basement membrane
Cementoblasts
The dental lamina

30. What happens during the bud stage?
Dental papilla
Enamel organ invaginates into the dental papilla
Odontoblastic process
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

31. What happens during the maturation stage?
8th week
Dental tissues fully mineralize to their mature levels.
Dental follicle
9th to 10th weeks

32. What are the incremental lines for enamel?
Hereditary
Lines of Retzuis
When the gingiva recedes and no actual tooth movement takes place
Union of root structure of two or more teeth by cementum

33. What happens when the reduced enamel epithelium is created?
Enamel
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
A bilayer rim that consists only IEE and OEE
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

34. What stage does the dental tissues subsequently fully mineralize
Initiation stage
Maturation
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

35. What happens during the appositional stage?
Common on permanent molars or cingulum of anterior teeth
The enamel - dentin - and cementum are secreted in successive layers
Tooth germ tries to divide
Proliferation - differentiation - morphogenesis

36. What hard tissue has vascularity?
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 basement membrane
Alveolar bone
Morphogenesis

37. What are the clinical ramifications of supernumerary teeth?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
A bilayer rim that consists only IEE and OEE
Extra cusp due to effects on enamel organ
The basement membrane

38. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Trauma - pressure or metabolic disease
The enamel - dentin - and cementum are secreted in successive layers
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

39. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Initiation
Hereditary
Development of one or more extra teeth

40. What is the primordium of the tooth?
Common with permanent maxillary molars
The tooth germ
Enamel pearl - enamel dysplasia - and concresence
Absence of single or multiple teeth

41. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The bud stage
Preameloblasts
Cementocytes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

42. What are entrapped cementoblasts called?
The ectomesenchyme - which was influenced by the neural crest cells
Differentiation
Enamel organ invaginates into the dental papilla
Cementocytes

43. How many types of cells are found in the enamel organ in the bell stage?
Pressure on the area
When the gingiva recedes and no actual tooth movement takes place
4 types
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

44. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The ectoderm
The bud stage
Proliferation
Traumatic injury or crowding of teeth

45. Where does the primordium of the permanent dentition develop?
The enamel organ is compressed
6th to 7th weeks
Only dentinal tubules with processes
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

46. What do the odontoblasts do?
Common with permanent maxillary molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
8th week
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

47. What is the cap in the cap stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental lamina
The enamel organ
Odontogenesis

48. What happens during the cap stage?
Oral epithelium
Osteocytes
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.
Dental follicle

49. What are the etiological factors for fusion?
Enamel secreting cells (ameloblasts)
Dens in dente - gemination - tubercle - and fusion
Pressure on the area
A mineralized cylinder - the dentinal tubule

50. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The cervical loop
6th to 7th weeks
Tooth germ
The actual vertical movement of the tooth

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Dentistry Tooth Development And Eruption

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