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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 type of tissue is enamel?
Dens in dente - gemination - tubercle - and fusion
A bilayer rim that consists only IEE and OEE
The enamel - dentin - and cementum are secreted in successive layers
Epithelial

2. Which teeth are nonsuccedaneous?
Large single rooted tooth with one pulp cavity and exhibits 'twinning' in crown area. normal number of teeth in dentition. may cause problems in appearance and spacing
Inner
Pressure on the area
The permanent molars

3. Where is the enamal organ originally derived from?
The ectoderm
Only dentinal tubules with processes
Bud stage
Differentiation - proliferation - morphogenesis

4. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The cervical loop

5. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Induction
Dental tissues fully mineralize to their mature levels.
The ameloblasts

6. In the cap stage the tooth bud does not grow - what happens?
Outer
There is unequal growth in different parts of the tooth bud
Pressure on the area
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

7. What is macrodontia?
Dental tissues secreted as matrix in successive layers.
Abnormally large teeth
The apposition of the enamel matrix
Maturation

8. What else undergoes proliferation in the bud stage besides the dental lamina?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementocytes
Arrest and reversal lines
The ectomesenchyme

9. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Dental papilla
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

10. What is fusion?
When the gingiva recedes and no actual tooth movement takes place
Union of 2 adjacent tooth germs
The enamel organ - dental papilla - dental sac
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

11. What are the clinical ramifications of enamel dysplasia?
Alveolar bone
Differentiation - proliferation - morphogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

12. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The tooth germ
Odontoblastic process
The basement membrane
Trauma - pressure or metabolic disease

13. What happens during the cap stage?
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.
Alveolar bone
The permanent molars
Odontoblastic process

14. What is the embryological background for dentin - cementum and alveolar bone?
There are none - they are lost with eruption
4 types
Common on permanent molars or cingulum of anterior teeth
Dental papilla

15. What causes the induction of the preameloblasts to differentiate into ameloblasts?
A bilayer rim that consists only IEE and OEE
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
May be confused as calculus deposit on root
Osteocytes

16. When does the tooth bud become a tooth germ?
In the cap stage
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
Cementoid
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

17. What kind of cells occur in the outer enamel epithelium in the bell stage?
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
Cementoblasts
Pressure on the area
Cuboidal cells

18. What are the incremental lines for enamel?
Lines of Retzuis
Cementoblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Traumatic injury or crowding of teeth

19. What is the structure responsible for root development?
The cervical loop
8th week
Odontogenesis
Development of one or more extra teeth

20. Which layer in the bell stage has star shaped cells?
8th week
A mineralized cylinder - the dentinal tubule
The stellate reticulum
Compressed layer of flat to cuboidal cells

21. What is the predominate process in the bell stage?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Hereditary in localized form. endocrine dysfunction is complete
Trauma - pressure or metabolic disease
Differentiation

22. What is concrescence?
Dens in dente - gemination - tubercle - and fusion
Union of root structure of two or more teeth by cementum
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 basement membrane

23. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Abnormally small teeth
The basement membrane
Connective
The ectomesenchyme

24. Passive eruption
Sphere of enamel on root
Cementoblasts
When the gingiva recedes and no actual tooth movement takes place
Dental tissues secreted as matrix in successive layers.

25. What is cementogenisis?
Proliferation
Hereditary
Differentiation
Apposition of the cementum

26. What processes are involved with the apposition stage?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Connective
Induction - proliferation
Apposition of the cementum

27. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Connective
8th week
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

28. Where does the primordium of the permanent dentition develop?
The ameloblasts place an acellular dental cuticle on the new enamel surface
9th to 10th 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 successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

29. What is microdontia?
Dentin secreting cells (odontoblats)
Only dentinal tubules with processes
Abnormally small teeth
The dental sac

30. What layer serves as protection for the enamel organ?
The cervical loop
The outer enamel epithelium
It disintegrates as the developing oral mucosa comes to line the oral cavity
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

31. What are the etiological factors for anodontia?
The basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Oral epithelium
Odontoblastic process

32. What is another name for the dental sac?
Dental follicle
Cementoid
The basement membrane
The ectoderm

33. What are the formative cells for dentin?
Odontoblasts
Pressure on the area
Only dentinal tubules with processes
Common with permanent maxillary molars

34. What are the clinical ramifications of micro/macrodontia?
Enamel organ invaginates into the dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars
Maturation
The enamel organ - dental papilla - dental sac

35. What stage does anodontia occur?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Lines of Retzuis
Local or systemic or hereditary
Initiation stage

36. The preameloblasts induce dental papilla cells to differentiate into what?
6th to 7th weeks
The stellate reticulum
Pressure on the area
Into odontoblasts

37. What are the formative cells for enamel?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Into odontoblasts
Ameloblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars

38. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Bud stage
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
A bilayer rim that consists only IEE and OEE

39. What are the formative cells for alveolar bone?
Osteoblasts
When the gingiva recedes and no actual tooth movement takes place
Dens in dente - gemination - tubercle - and fusion
Maturation

40. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Outer
The dental sac
The enamel organ
Proliferation - differentiation - morphogenesis

41. What will the dental sac give rise to?
Enamel organ invaginates into the dental papilla
The cementum - PDL - and alveolar bone
Enamel pearl - enamel dysplasia - and concresence
Common with permanent maxillary molars

42. What is the time span for the cap stage?
9th to 10th weeks
Differentiation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
A mineralized cylinder - the dentinal tubule

43. What happens during the maturation stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cuboidal cells
Dental tissues fully mineralize to their mature levels.
Common with permanent maxillary molars

44. Tooth development
The enamel organ - dental papilla - dental sac
Hereditary
Absence of single or multiple teeth
Odontogenesis

45. What are the clinical ramifications of anodontia?
Odontoblastic process
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Common on permanent molars or cingulum of anterior teeth
Oral epithelium

46. What are succedaneous teeth?
Union of root structure of two or more teeth by cementum
Extra cusp due to effects on enamel organ
Bud stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

47. Active eruption
Displacement of ameloblasts to root surface
Commonly involves permanent maxillary lateral incisor and 3rd molars
The actual vertical movement of the tooth
Enamel pearl - enamel dysplasia - and concresence

48. What are the clinical ramifications of dens in dente?
Dens in dente - gemination - tubercle - and fusion
Oral epithelium
The ectomesenchyme
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

49. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Bud stage
The dental lamina
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

50. What is the process involved in the maturation stage?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
In the cap stage
Maturation
Hereditary