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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What happens when the reduced enamel epithelium is created?
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
May be confused as calculus deposit on root
Initiation
Enamel organ invaginates into the dental papilla

2. What are the clinical ramifications?
The ectomesenchyme - which was influenced by the neural crest cells
Sphere of enamel on root
Common on permanent molars or cingulum of anterior teeth
Induction

3. Where is the enamal organ originally derived from?
Displacement of ameloblasts to root surface
The permanent molars
9th to 10th weeks
The ectoderm

4. What is the predominate process of the cap stage?
Proliferation - differentiation - morphogenesis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Morphogenesis
The outer enamel epithelium

5. What are the major components of the tooth germ?
Dental tissues secreted as matrix in successive layers.
Hereditary in localized form. endocrine dysfunction is complete
The enamel organ - dental papilla - dental sac
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

6. What type of tissue is enamel?
Epithelial
The enamel organ - dental papilla - dental sac
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
11th to 12th weeks

7. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
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 ectomesenchyme - which was influenced by the neural crest cells
9th to 10th weeks
The outer cells of the dental papilla and the central cells of the dental papilla

8. What are the development disturbances of the apposition and maturation stages?
Imbrication lines of von Ebner
In the cap stage
Enamel pearl - enamel dysplasia - and concresence
The outer cells of the dental papilla and the central cells of the dental papilla

9. What is enamel dysplasia?
Odontoblasts
Dentin and alveolar bone
Faulty development of enamel from interference involving ameloblasts
The basement membrane that seperates the enamel organ and dental papilla

10. What is macrodontia?
Initiation stage
The ameloblasts place an acellular dental cuticle on the new enamel surface
The ectomesenchyme
Abnormally large teeth

11. Which layer in the bell stage has star shaped cells?
Sphere of enamel on root
Cementoid
The stellate reticulum
Abnormally small teeth

12. What is the function of the Hertwig's epithelial root sheath?
Lines of Retzuis
Enamel organ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

13. 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
Abnormally large teeth
Dentin and alveolar bone
Extra cusp due to effects on enamel organ

14. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Outer
Morphogenesis
Initiation stage
Epithelial rests of Malassez

15. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
8th week
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Preameloblasts

16. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The permanent molars
The ectomesenchyme
Tooth germ
The basement membrane

17. What are the etiological factors of enamel dysplasia?
Differentiation
Local or systemic or hereditary
Dental tissues secreted as matrix in successive layers.
Imbrication lines of von Ebner

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

19. What are the formative cells for cementum?
Tall columnar cells
Epithelial
Cementoblasts
Induction

20. Where is the dental papilla originally derived from?
Differentiation
Arrest and reversal lines
The ectomesenchyme - which was influenced by the neural crest cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

21. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Hereditary in localized form. endocrine dysfunction is complete
Dental follicle
The bud stage
The permanent molars

22. What is dens in dente?
Abnormally large teeth
Enamel organ invaginates into the dental papilla
The primordium of the pulp
Induction

23. The stratum intermediate is located inner or outer?
Alveolar bone
Inner
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Hereditary

24. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Odontoblastic process
Maturation
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

25. What type of tissue is dentin - cementum - and alveolar bone?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla
Connective
Cementoblasts

26. 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
Pressure on the area
The cervical loop
Initiation stage

27. What are the incremental lines for enamel?
Odontoclasts
Pressure on the area
Enamel secreting cells (ameloblasts)
Lines of Retzuis

28. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Differentiation - proliferation - morphogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
In the cap stage

29. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Osteocytes
The dental sac
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

30. What are the incremental lines for dentin?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Hereditary
The ectomesenchyme
Imbrication lines of von Ebner

31. What are the clinical ramifications of micro/macrodontia?
The cementum - PDL - and alveolar bone
Commonly involves permanent maxillary lateral incisor and 3rd molars
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
4 types

32. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
When the gingiva recedes and no actual tooth movement takes place
Dental tissues secreted as matrix in successive layers.
A mineralized cylinder - the dentinal tubule

33. What is the primordium of the tooth?
The outer cells of the dental papilla and the central cells of the dental papilla
Outer
Displacement of ameloblasts to root surface
The tooth germ

34. What is the cementum matrix called?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Cementoid
Dental papilla
4 types

35. What is matrix?
Induction
Maturation
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

36. What is the time span for the cap stage?
9th to 10th weeks
A mineralized cylinder - the dentinal tubule
Hereditary
The enamel organ is compressed

37. What are the formative cells for dentin?
The cervical loop
Odontoblasts
Abnormally small teeth
Tooth germ tries to divide

38. What is the process involved in the maturation stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Maturation
When the gingiva recedes and no actual tooth movement takes place
Only dentinal tubules with processes

39. How is the dentinocemental junction formed?
Union of root structure of two or more teeth by cementum
Osteocytes
The enamel - dentin - and cementum are secreted in successive layers
As a result of the apposition of cementum over dentin

40. What are the etiological factors of tubercle?
Dental papilla
Trauma - pressure or metabolic disease
The actual vertical movement of the tooth
Dental tissues secreted as matrix in successive layers.

41. What are the clinical ramifications of fusion?
Bud stage
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Commonly involves permanent maxillary lateral incisor and 3rd molars

42. What happens during the bell stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Differentiation - proliferation - morphogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
A bilayer rim that consists only IEE and OEE

43. What is cementogenisis?
Preameloblasts
The cervical loop
Apposition of the cementum
9th to 10th weeks

44. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The ectoderm
11th to 12th weeks
It disintegrates as the developing oral mucosa comes to line the oral cavity

45. What are the mature cells for dentin?
Only dentinal tubules with processes
Ameloblasts
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 outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

46. What are the odontoblastic processes is contained in what?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel organ invaginates into the dental papilla
A mineralized cylinder - the dentinal tubule
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

47. What happens during the maturation stage?
Hereditary
Dental tissues fully mineralize to their mature levels.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Bud stage

48. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Oral epithelium
During the cap stage

49. What is gemination?
Proliferation - differentiation - morphogenesis
Only dentinal tubules with processes
Tooth germ tries to divide
Odontoclasts

50. What are the developmental disturbances of the cap stage?
The ectomesenchyme - which was influenced by the neural crest cells
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dens in dente - gemination - tubercle - and fusion
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion