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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 is the primordium of the tooth?
The tooth germ
The apposition of the enamel matrix
Common with permanent maxillary molars
4 types

2. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Tooth germ
Odontoblastic process
In the cap stage
Abnormally small teeth

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

4. What does the cervical loop consist of?
Imbrication lines of von Ebner
A bilayer rim that consists only IEE and OEE
Dentin and alveolar bone
Only dentinal tubules with processes

5. Where is the dental sac originally derived from?
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
Union of root structure of two or more teeth by cementum
The ectomesenchyme

6. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
The enamel - dentin - and cementum are secreted in successive layers
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
As a result of the apposition of cementum over dentin

7. What is the predominate process of the cap stage?
Tall columnar cells
Connective
Morphogenesis
Extra cusp due to effects on enamel organ

8. What are the etiological factors for micro/macrodontia?
Common with permanent maxillary molars
6th to 7th weeks
Hereditary in localized form. endocrine dysfunction is complete
Common on permanent molars or cingulum of anterior teeth

9. What are the etiological factors for dens in dente and gemination?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Tooth germ tries to divide
Hereditary

10. What are the mature cells for cementum?
Tall columnar cells
Dental papilla
The apposition of the enamel matrix
Cementocytes

11. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The basement membrane

12. What is the time span for the cap stage?
Maturation
Enamel pearl - enamel dysplasia - and concresence
9th to 10th weeks
Dental tissues fully mineralize to their mature levels.

13. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Dentin secreting cells (odontoblats)
The apposition of the enamel matrix
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

14. Active eruption
Future dentin and pulp tissue
Lines of Retzuis
Initiation stage
The actual vertical movement of the tooth

15. 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
Differentiation
Cementoblasts
Only dentinal tubules with processes

16. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Tall columnar cells
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementocytes
The enamel - dentin - and cementum are secreted in successive layers

17. What will the dental papilla eventually form?
Cementoid
Odontogenesis
Future dentin and pulp tissue
A bilayer rim that consists only IEE and OEE

18. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Tooth germ
6th to 7th weeks
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 ameloblasts

19. The oral epithelium is induced by the ectomesenchyme to produce what?
Enamel pearl - enamel dysplasia - and concresence
The stellate reticulum
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The dental lamina

20. What stage does the dental tissues subsequently fully mineralize
There is unequal growth in different parts of the tooth bud
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Trauma - pressure or metabolic disease
Maturation

21. What is macrodontia?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental lamina
Abnormally large teeth
Proliferation

22. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
The outer enamel epithelium
Maturation
Imbrication lines of von Ebner

23. What are the major components of the tooth germ?
Common on permanent molars or cingulum of anterior teeth
Dentin secreting cells (odontoblats)
Sphere of enamel on root
The enamel organ - dental papilla - dental sac

24. What is the main process involved in the bud stage?
The bud stage
Sphere of enamel on root
Proliferation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

25. What are the clinical ramifications of anodontia?
6th to 7th weeks
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Abnormally large teeth
The dental lamina

26. What processes are involved with the apposition stage?
Dental tissues fully mineralize to their mature levels.
Enamel organ
Osteoblasts
Induction - proliferation

27. What type of tissue is dentin - cementum - and alveolar bone?
The ectomesenchyme
Connective
Odontoblastic process
Epithelial rests of Malassez

28. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Cementocytes
The permanent molars
Abnormally large teeth

29. What is gemination?
Tooth germ tries to divide
The dental sac
Common with permanent maxillary molars
Enamel secreting cells (ameloblasts)

30. What is dens in dente?
Future dentin and pulp tissue
Into odontoblasts
Enamel organ invaginates into the dental papilla
The permanent molars

31. What type of tissue is enamel?
Pressure on the area
Differentiation - proliferation - morphogenesis
Dentin secreting cells (odontoblats)
Epithelial

32. What are the etiological factors of concrescence?
Initiation
Traumatic injury or crowding of teeth
Enamel secreting cells (ameloblasts)
4 types

33. 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
Dens in dente - gemination - tubercle - and fusion
Proliferation
Odontoblasts

34. Which teeth are nonsuccedaneous?
The outer cells of the dental papilla and the central cells of the dental papilla
The permanent molars
Odontoclasts
Cementoid

35. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The cementum - PDL - and alveolar bone
Union of root structure of two or more teeth by cementum
Faulty development of enamel from interference involving ameloblasts
The bud stage

36. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental lamina
Differentiation
Pressure on the area

37. What are the processes involved in the cap stage?
Dens in dente - gemination - tubercle - and fusion
Union of 2 adjacent tooth germs
Proliferation - differentiation - morphogenesis
The enamel organ is compressed

38. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Preameloblasts
Dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity

39. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Enamel organ invaginates into the dental papilla
When the gingiva recedes and no actual tooth movement takes place
Cementoblasts

40. What are the clinical ramifications of enamel dysplasia?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
As a result of the apposition of cementum over dentin
Enamel pearl - enamel dysplasia - and concresence

41. 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
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Compressed layer of flat to cuboidal cells
Common on permanent molars or cingulum of anterior teeth

42. When does the process of root development take place?
Tooth germ
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel
8th week

43. What is the time span for initiation?
Cementoblasts
Tall columnar cells
6th to 7th weeks
Odontoblastic process

44. What are the incremental lines for cementum and alveolar bone?
Common with permanent maxillary molars
Bud stage
Arrest and reversal lines
Maturation

45. What are the formative cells for enamel?
Local or systemic or hereditary
Displacement of ameloblasts to root surface
The dental lamina
Ameloblasts

46. What are the clinical ramifications of supernumerary teeth?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Common with permanent maxillary molars
Dentin secreting cells (odontoblats)
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

47. What is the function of the Hertwig's epithelial root sheath?
The cementum - PDL - and alveolar bone
Odontoblastic process
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
A mineralized cylinder - the dentinal tubule

48. What is the site for the future dentioenamel junction?
Future dentin and pulp tissue
Tooth germ
The basement membrane that seperates the enamel organ and dental papilla
Abnormally small teeth

49. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Displacement of ameloblasts to root surface
Morphogenesis
Epithelial rests of Malassez
Dental follicle

50. What is the embryological background for enamel?
Osteocytes
Dental papilla
Enamel organ
Absence of single or multiple teeth