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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. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Dental papilla
Maturation
Epithelial rests of Malassez
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

2. What are the mature cells for enamel?
The enamel organ - dental papilla - dental sac
6th to 7th weeks
There are none - they are lost with eruption
Pressure on the area

3. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The enamel organ is compressed
Odontoclasts
Cementoblasts
Dentin secreting cells (odontoblats)

4. What are the clinical ramifications of fusion?
Proliferation - differentiation - morphogenesis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Hereditary
Faulty development of enamel from interference involving ameloblasts

5. What are the formative cells for enamel?
Ameloblasts
Preameloblasts
May be confused as calculus deposit on root
Epithelial rests of Malassez

6. What wll the inner enamel epithelium differentiate into?
Tooth germ
Enamel secreting cells (ameloblasts)
Sphere of enamel on root
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

7. What layer serves as protection for the enamel organ?
The outer enamel epithelium
The stellate reticulum
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

8. When does the tooth bud become a tooth germ?
In the cap stage
Induction - proliferation
Pressure on the area
A bilayer rim that consists only IEE and OEE

9. What are the major components of the tooth germ?
Odontoblastic process
Cementoblasts
Enamel organ invaginates into the dental papilla
The enamel organ - dental papilla - dental sac

10. What are the clinical ramifications of concrescence?
Apposition of the cementum
Enamel organ
Common with permanent maxillary molars
Arrest and reversal lines

11. Active eruption
Only dentinal tubules with processes
The actual vertical movement of the tooth
Abnormally large teeth
Odontoclasts

12. What will the inner cells of the dental lamina differentiates into?
Tooth germ
Local or systemic or hereditary
In the cap stage
The primordium of the pulp

13. What is the time span for initiation?
Abnormally small teeth
6th to 7th weeks
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
Odontoblasts

14. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Displacement of ameloblasts to root surface
When the gingiva recedes and no actual tooth movement takes place
Abnormally large teeth

15. What type of tissue is dentin - cementum - and alveolar bone?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Connective
Development of one or more extra teeth
Alveolar bone

16. What is the cap in the cap stage?
The enamel organ
Apposition of the cementum
When the gingiva recedes and no actual tooth movement takes place
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

17. What are the formative cells for cementum?
Enamel
Cementoblasts
Bud stage
Maturation

18. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ - dental papilla - dental sac
Enamel pearl - enamel dysplasia - and concresence
Cementocytes

19. What is microdontia?
Abnormally small teeth
Faulty development of enamel from interference involving ameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Union of 2 adjacent tooth germs

20. What are the mature cells for alveolar bone?
Compressed layer of flat to cuboidal cells
Connective
Osteocytes
Dental tissues secreted as matrix in successive layers.

21. What hard tissue is innervated by nerves?
A bilayer rim that consists only IEE and OEE
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The apposition of the enamel matrix
Dentin and alveolar bone

22. Passive eruption
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Development of one or more extra teeth
When the gingiva recedes and no actual tooth movement takes place
Initiation stage

23. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Odontoclasts
Local or systemic or hereditary
The tooth germ

24. What are the clinical ramifications of anodontia?
Differentiation
Cementocytes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental papilla

25. What is the predominate process in the bell stage?
Compressed layer of flat to cuboidal cells
Union of root structure of two or more teeth by cementum
Differentiation
The enamel organ is compressed

26. What is tubercle?
Extra cusp due to effects on enamel organ
May be confused as calculus deposit on root
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

27. What are entrapped cementoblasts called?
Cementocytes
Outer
Dentin secreting cells (odontoblats)
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

28. What stage does supernumerary teeth occur?
Odontoblasts
May be confused as calculus deposit on root
Enamel pearl - enamel dysplasia - and concresence
Initiation

29. What is an enamel pearl?
Abnormally small teeth
Sphere of enamel on root
The primordium of the pulp
Displacement of ameloblasts to root surface

30. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Displacement of ameloblasts to root surface
Pressure on the area
Preameloblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity

31. The stellate reticulum is located inner or outer?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Differentiation - proliferation - morphogenesis
Outer
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

32. What are the mature cells for cementum?
Abnormally large teeth
Dental papilla
Cementocytes
During the cap stage

33. Tooth development
Differentiation
The ectoderm
Odontogenesis
Induction - proliferation

34. What is another name for the dental sac?
Dental follicle
The enamel organ
Enamel
The ectomesenchyme - which was influenced by the neural crest cells

35. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
The basement membrane
Epithelial rests of Malassez
The ameloblasts place an acellular dental cuticle on the new enamel surface

36. What is macrodontia?
Tooth germ
Ameloblasts
Abnormally large teeth
Pressure on the area

37. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontoblastic process
Enamel pearl - enamel dysplasia - and concresence

38. What are the mature cells for dentin?
Epithelial rests of Malassez
May be confused as calculus deposit on root
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Only dentinal tubules with processes

39. What happens during the cap stage?
The enamel - dentin - and cementum are secreted in successive layers
Development of one or more extra teeth
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.
4 types

40. What happens when the reduced enamel epithelium is created?
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
The ectoderm
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

41. What are the incremental lines for cementum and alveolar bone?
The enamel - dentin - and cementum are secreted in successive layers
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Arrest and reversal lines
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

42. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Initiation
The basement membrane
The stellate reticulum
Faulty development of enamel from interference involving ameloblasts

43. What are the etiological factors for supernumerary teeth?
Hereditary
Cementocytes
The ectomesenchyme - which was influenced by the neural crest cells
Lines of Retzuis

44. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The enamel organ is compressed
4 types
Cuboidal cells
Dental papilla

45. When does macro/microdontia occur?
Bud stage
Only dentinal tubules with processes
The outer cells of the dental papilla and the central cells of the dental papilla
The stellate reticulum

46. What are the clinical ramifications of gemination?

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47. What is the cementum matrix called?
The outer cells of the dental papilla and the central cells of the dental papilla
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Oral epithelium
Cementoid

48. Where is the enamal organ originally derived from?
Odontoclasts
The ectomesenchyme
May be confused as calculus deposit on root
The ectoderm

49. What is the time span for the cap stage?
Union of root structure of two or more teeth by cementum
9th to 10th weeks
Lines of Retzuis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

50. Which teeth are nonsuccedaneous?
Bud stage
Enamel
Into odontoblasts
The permanent molars