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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 are the formative cells for enamel?
Odontoblastic process
The ectomesenchyme
Alveolar bone
Ameloblasts

2. How is the reduced enamel epithelium created?
Dental papilla
Dental follicle
Dental tissues fully mineralize to their mature levels.
The enamel organ is compressed

3. What are the etiological factors for dens in dente and gemination?
Hereditary in localized form. endocrine dysfunction is complete
Cementocytes
It disintegrates as the developing oral mucosa comes to line the oral cavity
Hereditary

4. What is anodontia?
Dens in dente - gemination - tubercle - and fusion
Tall columnar cells
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Absence of single or multiple teeth

5. In the cap stage the tooth bud does not grow - what happens?
Extra cusp due to effects on enamel organ
There is unequal growth in different parts of the tooth bud
Cementoblasts
Morphogenesis

6. What are the formative cells for cementum?
Cementoblasts
Enamel secreting cells (ameloblasts)
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The basement membrane

7. What happens when the reduced enamel epithelium is created?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
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
6th to 7th weeks

8. What is concrescence?
Dental tissues secreted as matrix in successive layers.
Union of root structure of two or more teeth by cementum
Cementoid
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

9. What are the incremental lines for cementum and alveolar bone?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The outer enamel epithelium
Cementoblasts
Arrest and reversal lines

10. What is the time span for the cap stage?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
9th to 10th weeks
Dentin and alveolar bone
Only dentinal tubules with processes

11. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Dental tissues fully mineralize to their mature levels.
Union of root structure of two or more teeth by cementum
Odontoblasts

12. What is gemination?
There is unequal growth in different parts of the tooth bud
Extra cusp due to effects on enamel organ
The ectomesenchyme
Tooth germ tries to divide

13. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Pressure on the area
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The cementum - PDL - and alveolar bone

14. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Apposition of the cementum
Preameloblasts
Abnormally small teeth
Cementoblasts

15. What are entrapped cementoblasts called?
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
Dental follicle
The actual vertical movement of the tooth
Cementocytes

16. What is the embryological background for enamel?
Enamel organ
Trauma - pressure or metabolic disease
The ectomesenchyme - which was influenced by the neural crest cells
The actual vertical movement of the tooth

17. What stage does anodontia occur?
Induction
Initiation stage
Cementoblasts
Enamel organ

18. What are the clinical ramifications of enamel pearl?
Dentin and alveolar bone
Maturation
When the gingiva recedes and no actual tooth movement takes place
May be confused as calculus deposit on root

19. What type of tissue is enamel?
A mineralized cylinder - the dentinal tubule
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Epithelial
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

20. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Dentin secreting cells (odontoblats)
Odontoclasts
6th to 7th weeks
Differentiation

21. The stratum intermediate is located inner or outer?
Inner
6th to 7th weeks
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Morphogenesis

22. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Abnormally large teeth
Trauma - pressure or metabolic disease
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

23. 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
Local or systemic or hereditary
The stellate reticulum
Proliferation - differentiation - morphogenesis

24. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Common on permanent molars or cingulum of anterior teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Apposition of the cementum

25. What is tubercle?
There are none - they are lost with eruption
Connective
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Extra cusp due to effects on enamel organ

26. What is the predominate process of the cap stage?
The actual vertical movement of the tooth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The enamel - dentin - and cementum are secreted in successive layers
Morphogenesis

27. What is the time span for the bud stage?
Dental papilla
Dental papilla
When the gingiva recedes and no actual tooth movement takes place
8th week

28. What are the etiological factors of tubercle?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Ameloblasts
Enamel organ
Trauma - pressure or metabolic disease

29. What are the clinical ramifications of anodontia?
Oral epithelium
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane that seperates the enamel organ and dental papilla
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

30. What is microdontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Abnormally small teeth
As a result of the apposition of cementum over dentin
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

31. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Into odontoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
9th to 10th weeks

32. What will the inner cells of the dental lamina differentiates into?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The primordium of the pulp
Enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface

33. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The basement membrane
The cervical loop
Ameloblasts

34. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Morphogenesis
Apposition of the cementum
Odontoblastic process

35. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
When the gingiva recedes and no actual tooth movement takes place
Osteocytes
The ectoderm

36. What are the clinical ramifications of gemination?

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37. What is the primordium of the tooth?
The tooth germ
Faulty development of enamel from interference involving ameloblasts
Initiation stage
The basement membrane that seperates the enamel organ and dental papilla

38. What is amelogenisis?
Cementoblasts
Trauma - pressure or metabolic disease
The apposition of the enamel matrix
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

39. What hard tissue has vascularity?
Alveolar bone
Enamel pearl - enamel dysplasia - and concresence
A bilayer rim that consists only IEE and OEE
Dental papilla

40. What is dens in dente?
Hereditary in localized form. endocrine dysfunction is complete
Induction - proliferation
Tooth germ tries to divide
Enamel organ invaginates into the dental papilla

41. What are the odontoblastic processes is contained in what?
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
Traumatic injury or crowding of teeth
A mineralized cylinder - the dentinal tubule

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

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43. What happens to the thickened non tooth producing portions of the dental lamina eventually?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
It disintegrates as the developing oral mucosa comes to line the oral cavity
Ameloblasts
Morphogenesis

44. What are the clinical ramifications of dens in dente?
Odontogenesis
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The dental sac
The ectomesenchyme

45. What are the etiological factors for enamel pearl?
The permanent molars
Displacement of ameloblasts to root surface
Faulty development of enamel from interference involving ameloblasts
Initiation stage

46. What are succedaneous teeth?
Lines of Retzuis
Dental tissues secreted as matrix in successive layers.
Into odontoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

47. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Outer
Union of root structure of two or more teeth by cementum
Cuboidal cells
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

48. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Lines of Retzuis
Morphogenesis

49. What is the structure responsible for root development?
6th to 7th weeks
The cervical loop
The ectomesenchyme
May be confused as calculus deposit on root

50. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Inner
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Lines of Retzuis