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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. Where is the enamel matrix secreted from by the ameloblasts?

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2. What is the main process involved in initiation?
Dental tissues fully mineralize to their mature levels.
Induction
Common on permanent molars or cingulum of anterior teeth
Abnormally large teeth

3. What are the development disturbances of the apposition and maturation stages?
Dentin secreting cells (odontoblats)
Maturation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel pearl - enamel dysplasia - and concresence

4. What are the clinical ramifications of concrescence?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental papilla
Common with permanent maxillary molars
Only dentinal tubules with processes

5. What happens when the reduced enamel epithelium is created?
Differentiation - proliferation - morphogenesis
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
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer cells of the dental papilla and the central cells of the dental papilla

6. What is cementogenisis?
Differentiation
In the cap stage
Cementoblasts
Apposition of the cementum

7. What are the clinical ramifications of enamel dysplasia?
Cementocytes
Dental tissues fully mineralize to their mature levels.
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
4 types

8. What happens during the maturation stage?
The dental lamina
Dentin and alveolar bone
Dental tissues fully mineralize to their mature levels.
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

9. What is the structure responsible for root development?
The cervical loop
Odontoblastic process
Extra cusp due to effects on enamel organ
Abnormally small teeth

10. Where does the primordium of the permanent dentition develop?
The basement membrane that seperates the enamel organ and dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The basement membrane
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

11. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Induction
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
A mineralized cylinder - the dentinal tubule

12. What are the processes involved in the cap stage?
Osteocytes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Proliferation - differentiation - morphogenesis
Dentin and alveolar bone

13. What are the clinical ramifications of anodontia?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Enamel
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

14. What processes are involved with the apposition stage?
The enamel - dentin - and cementum are secreted in successive layers
Odontoclasts
Induction - proliferation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

15. Where is the dental papilla originally derived from?
There is unequal growth in different parts of the tooth bud
Absence of single or multiple teeth
The ectomesenchyme - which was influenced by the neural crest cells
Union of root structure of two or more teeth by cementum

16. What is an enamel pearl?
Tooth germ tries to divide
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Common on permanent molars or cingulum of anterior teeth
Sphere of enamel on root

17. What are the major components of the tooth germ?
8th week
The enamel organ - dental papilla - dental sac
Alveolar bone
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

18. The stellate reticulum is located inner or outer?
The enamel organ is compressed
Outer
Proliferation - differentiation - morphogenesis
Abnormally large teeth

19. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Pressure on the area
Faulty development of enamel from interference involving ameloblasts
When the gingiva recedes and no actual tooth movement takes place

20. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Abnormally small teeth
Common with permanent maxillary molars
Tooth germ
The ameloblasts place an acellular dental cuticle on the new enamel surface

21. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Preameloblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

22. What hard tissue has vascularity?
Alveolar bone
The bud stage
The actual vertical movement of the tooth
Cuboidal cells

23. What is gemination?
Maturation
The outer cells of the dental papilla and the central cells of the dental papilla
The primordium of the pulp
Tooth germ tries to divide

24. What is the predominate process of the cap stage?
Maturation
During the cap stage
The ectomesenchyme
Morphogenesis

25. What stage does the dental tissues subsequently fully mineralize
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells
Maturation

26. What are the incremental lines for cementum and alveolar bone?
Initiation
Arrest and reversal lines
Cementocytes
Odontoblastic process

27. What layer serves as protection for the enamel organ?
Epithelial rests of Malassez
Alveolar bone
The outer enamel epithelium
Enamel pearl - enamel dysplasia - and concresence

28. What is microdontia?
Osteoblasts
Abnormally small teeth
Cementoid
The tooth germ

29. What is the time span for the cap stage?
9th to 10th weeks
Hereditary
Displacement of ameloblasts to root surface
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

30. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
The ameloblasts place an acellular dental cuticle on the new enamel surface
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Only dentinal tubules with processes

31. What are the formative cells for enamel?
Ameloblasts
There is unequal growth in different parts of the tooth bud
When the gingiva recedes and no actual tooth movement takes place
Compressed layer of flat to cuboidal cells

32. What is matrix?
The ectoderm
8th week
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Compressed layer of flat to cuboidal cells

33. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
4 types
Abnormally small teeth
The basement membrane
Tooth germ tries to divide

34. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Inner
Local or systemic or hereditary
Enamel

35. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
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
Alveolar bone
Into odontoblasts

36. What is the embryological background for enamel?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The permanent molars
Enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

37. What are the etiological factors for fusion?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Pressure on the area
Faulty development of enamel from interference involving ameloblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

38. What is the primordium of the tooth?
The ameloblasts
The tooth germ
Ameloblasts
Preameloblasts

39. What are the mature cells for enamel?
Common with permanent maxillary molars
Maturation
There are none - they are lost with eruption
It disintegrates as the developing oral mucosa comes to line the oral cavity

40. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
Cementoid
The dental lamina
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

41. What is the time span for initiation?
The dental sac
Induction - proliferation
6th to 7th weeks
The basement membrane

42. What are the clinical ramifications?
Union of 2 adjacent tooth germs
There are none - they are lost with eruption
Oral epithelium
Common on permanent molars or cingulum of anterior teeth

43. In the cap stage the tooth bud does not grow - what happens?
The enamel - dentin - and cementum are secreted in successive layers
Pressure on the area
Ameloblasts
There is unequal growth in different parts of the tooth bud

44. What are the mature cells for alveolar bone?
Osteocytes
May be confused as calculus deposit on root
The basement membrane
Tooth germ

45. What happens during the bell stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ectomesenchyme
The dental sac
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

46. What are the clinical ramifications of gemination?

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47. What hard tissue is can not have tissue formation after eruption?
Dental follicle
Enamel
Outer
Lines of Retzuis

48. What are supernumerary teeth?
Arrest and reversal lines
Development of one or more extra teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel pearl - enamel dysplasia - and concresence

49. What is fusion?
The basement membrane that seperates the enamel organ and dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Union of 2 adjacent tooth germs
Maturation

50. Which layer in the bell stage has star shaped cells?
The dental sac
May be confused as calculus deposit on root
The stellate reticulum
Cuboidal cells