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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. What is macrodontia?
Tooth germ
Abnormally large teeth
Preameloblasts
Hereditary

2. What are entrapped cementoblasts called?
There are none - they are lost with eruption
Cementocytes
Extra cusp due to effects on enamel organ
Induction

3. What type of tissue is enamel?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Odontoblastic process
Epithelial
The bud stage

4. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
There are none - they are lost with eruption
Preameloblasts
The apposition of the enamel matrix

5. What are the formative cells for alveolar bone?
Cementoblasts
Osteoblasts
Common with permanent maxillary molars
Dental tissues fully mineralize to their mature levels.

6. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The bud stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Common on permanent molars or cingulum of anterior teeth

7. Tooth development
Odontogenesis
Trauma - pressure or metabolic disease
Bud stage
The ectomesenchyme

8. The oral epithelium is induced by the ectomesenchyme to produce what?
The primordium of the pulp
The dental lamina
Proliferation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

9. What is the structure responsible for root development?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The cervical loop
Absence of single or multiple teeth
The tooth germ

10. What else undergoes proliferation in the bud stage besides the dental lamina?
The enamel organ - dental papilla - dental sac
Abnormally large teeth
The ectomesenchyme
Imbrication lines of von Ebner

11. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel organ invaginates into the dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dentin and alveolar bone
Preameloblasts

12. Active eruption
The basement membrane
The actual vertical movement of the tooth
The ectomesenchyme
Future dentin and pulp tissue

13. What are the clinical ramifications of concrescence?
Into odontoblasts
Common with permanent maxillary molars
Absence of single or multiple teeth
Bud stage

14. Where is the dental papilla originally derived from?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
A bilayer rim that consists only IEE and OEE
The ectomesenchyme - which was influenced by the neural crest cells
Morphogenesis

15. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Odontoclasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
The basement membrane
Differentiation - proliferation - morphogenesis

16. What is the cap in the cap stage?
Local or systemic or hereditary
Tooth germ tries to divide
The enamel organ
Morphogenesis

17. What is the cementum matrix called?
Epithelial
Dental papilla
Cementoid
Tall columnar cells

18. What are the mature cells for cementum?
Cementocytes
The basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity
Oral epithelium

19. What are the etiological factors of concrescence?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Inner
Traumatic injury or crowding of teeth
The ectomesenchyme

20. What are the clinical ramifications of dens in dente?
The ectomesenchyme
Induction
There are none - they are lost with eruption
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

21. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Hereditary
The basement membrane that seperates the enamel organ and dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cementoid

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

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23. What is the function of the Hertwig's epithelial root sheath?
Induction - proliferation
Odontoblastic process
Enamel organ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

24. What are the clinical ramifications of enamel dysplasia?
The ameloblasts place an acellular dental cuticle on the new enamel surface
11th to 12th weeks
Cementocytes
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

25. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Ameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
It disintegrates as the developing oral mucosa comes to line the oral cavity

26. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
There are none - they are lost with eruption
May be confused as calculus deposit on root
Future dentin and pulp tissue

27. What wll the inner enamel epithelium differentiate into?
Abnormally small teeth
Enamel secreting cells (ameloblasts)
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Common with permanent maxillary molars

28. Which teeth are nonsuccedaneous?
Lines of Retzuis
Dental follicle
The actual vertical movement of the tooth
The permanent molars

29. What is another name for the dental sac?
Epithelial
Dental tissues fully mineralize to their mature levels.
Enamel
Dental follicle

30. Where is the enamal organ originally derived from?
A bilayer rim that consists only IEE and OEE
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectoderm
Ameloblasts

31. What is an enamel pearl?
Hereditary
Sphere of enamel on root
Enamel organ
Cementoid

32. What is the time span for the bud stage?
Extra cusp due to effects on enamel organ
Differentiation - proliferation - morphogenesis
A bilayer rim that consists only IEE and OEE
8th week

33. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Odontogenesis
9th to 10th weeks
Bud stage

34. What kind of cells occur in the outer enamel epithelium in the bell stage?
The ectomesenchyme - which was influenced by the neural crest cells
Epithelial rests of Malassez
Cuboidal cells
The ectoderm

35. What stage does supernumerary teeth occur?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Initiation
The stellate reticulum
Compressed layer of flat to cuboidal cells

36. 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
The dental lamina
It disintegrates as the developing oral mucosa comes to line the oral cavity
Imbrication lines of von Ebner

37. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Connective
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel organ - dental papilla - dental sac
Odontoblastic process

38. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Faulty development of enamel from interference involving ameloblasts
Pressure on the area
Induction

39. What layer serves as protection for the enamel organ?
Induction - proliferation
Union of root structure of two or more teeth by cementum
Morphogenesis
The outer enamel epithelium

40. What are the mature cells for dentin?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The ameloblasts
Only dentinal tubules with processes
Odontoclasts

41. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
The permanent molars
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
Ameloblasts

42. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Osteoblasts
The cementum - PDL - and alveolar bone
The enamel organ

43. What are the processes involved in the cap stage?
The enamel - dentin - and cementum are secreted in successive layers
Alveolar bone
Lines of Retzuis
Proliferation - differentiation - morphogenesis

44. What is microdontia?
Ameloblasts
The enamel organ
Abnormally small teeth
The ectomesenchyme

45. What kind of cells reside in the stratum intermediate?
The enamel organ
Compressed layer of flat to cuboidal cells
Morphogenesis
As a result of the apposition of cementum over dentin

46. What is the time span for initiation?
The enamel organ - dental papilla - dental sac
Odontoblastic process
6th to 7th weeks
4 types

47. What happens during the appositional stage?
Ameloblasts
The enamel organ
The enamel - dentin - and cementum are secreted in successive layers
Cementoid

48. What are the etiological factors for fusion?
Dental tissues fully mineralize to their mature levels.
Pressure on the area
Maturation
Arrest and reversal lines

49. What are the clinical ramifications of enamel pearl?
The ectomesenchyme
May be confused as calculus deposit on root
The ectomesenchyme
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

50. What happens during the apposition stage?
The enamel organ - dental papilla - dental sac
Dental tissues secreted as matrix in successive layers.
Only dentinal tubules with processes
The permanent molars

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Dentistry Tooth Development And Eruption

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