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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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1. What is the time span for the bud stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoclasts
Future dentin and pulp tissue
8th week

2. What is the time span for the cap stage?
The permanent molars
9th to 10th weeks
Preameloblasts
Common with permanent maxillary molars

3. What type of tissue is dentin - cementum - and alveolar bone?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Connective
The primordium of the pulp
Hereditary

4. What are the etiological factors for fusion?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The apposition of the enamel matrix
Pressure on the area
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

5. What hard tissue has vascularity?
Alveolar bone
Cementoid
Cementoblasts
Lines of Retzuis

6. Which teeth are nonsuccedaneous?
The actual vertical movement of the tooth
The ameloblasts
Epithelial
The permanent molars

7. What is amelogenisis?
Tooth germ
Dental tissues secreted as matrix in successive layers.
Displacement of ameloblasts to root surface
The apposition of the enamel matrix

8. When does dens in dente occur?
Cementoblasts
Proliferation
During the cap stage
Common on permanent molars or cingulum of anterior teeth

9. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Morphogenesis
Odontoclasts
The dental sac
Alveolar bone

10. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The cervical loop
Epithelial rests of Malassez
Odontoblasts
The ectomesenchyme

11. When does the tooth bud become a tooth germ?
Dentin secreting cells (odontoblats)
Initiation
In the cap stage
Odontoblastic process

12. What happens during the maturation stage?
The ectomesenchyme - which was influenced by the neural crest cells
Dental tissues secreted as matrix in successive layers.
Dental tissues fully mineralize to their mature levels.
Odontoblasts

13. What are the incremental lines for dentin?
Hereditary
Tooth germ
Enamel pearl - enamel dysplasia - and concresence
Imbrication lines of von Ebner

14. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Osteoblasts
The permanent molars
The apposition of the enamel matrix

15. Where is the dental papilla originally derived from?
The cervical loop
Outer
Traumatic injury or crowding of teeth
The ectomesenchyme - which was influenced by the neural crest cells

16. What are supernumerary teeth?
9th to 10th weeks
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel pearl - enamel dysplasia - and concresence
Development of one or more extra teeth

17. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Differentiation - proliferation - morphogenesis
A mineralized cylinder - the dentinal tubule
Differentiation

18. How many types of cells are found in the enamel organ in the bell stage?
Hereditary in localized form. endocrine dysfunction is complete
Local or systemic or hereditary
4 types
Initiation stage

19. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Imbrication lines of von Ebner
The bud stage
Oral epithelium
Maturation

20. What are the etiological factors of concrescence?
Union of root structure of two or more teeth by cementum
6th to 7th weeks
Traumatic injury or crowding of teeth
Cementocytes

21. What happens when the reduced enamel epithelium is created?
Induction
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
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
Tall columnar cells

22. What will the dental sac give rise to?
Dens in dente - gemination - tubercle - and fusion
Local or systemic or hereditary
The cementum - PDL - and alveolar bone
Arrest and reversal lines

23. What is the predominate process of the cap stage?
During the cap stage
Imbrication lines of von Ebner
Dentin secreting cells (odontoblats)
Morphogenesis

24. What is the site for the future dentioenamel junction?
Cuboidal cells
The stellate reticulum
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

25. Active eruption
Epithelial rests of Malassez
Tooth germ
Initiation stage
The actual vertical movement of the tooth

26. What is an enamel pearl?
Sphere of enamel on root
4 types
The actual vertical movement of the tooth
The basement membrane

27. What is the main process involved in initiation?
Apposition of the cementum
Induction
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
Maturation

28. What is the time span for the bell stage?
Outer
Cementoblasts
Epithelial
11th to 12th weeks

29. What is the embryological background for dentin - cementum and alveolar bone?
Abnormally small teeth
Dental papilla
Cementocytes
The enamel organ

30. In the cap stage the tooth bud does not grow - what happens?
Dens in dente - gemination - tubercle - and fusion
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
There is unequal growth in different parts of the tooth bud
Into odontoblasts

31. What are the developmental disturbances of the cap stage?
Osteoblasts
Union of root structure of two or more teeth by cementum
Dental tissues secreted as matrix in successive layers.
Dens in dente - gemination - tubercle - and fusion

32. What are the odontoblastic processes is contained in what?
The dental sac
Alveolar bone
8th week
A mineralized cylinder - the dentinal tubule

33. What are the mature cells for enamel?
Dental papilla
Induction
There are none - they are lost with eruption
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

34. Where is the enamal organ originally derived from?
The ectoderm
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
Traumatic injury or crowding of teeth
The permanent molars

35. What are the clinical ramifications of micro/macrodontia?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally large teeth

36. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Initiation
The ameloblasts
As a result of the apposition of cementum over dentin
Alveolar bone

37. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Development of one or more extra teeth
Odontoblasts
Tooth germ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

38. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Initiation stage
The basement membrane
Preameloblasts
Absence of single or multiple teeth

39. What are the etiological factors of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
6th to 7th weeks
Local or systemic or hereditary
Absence of single or multiple teeth

40. How is the reduced enamel epithelium created?
The enamel organ is compressed
9th to 10th weeks
Osteoblasts
Odontoblastic process

41. What are the clinical ramifications?
The dental sac
Arrest and reversal lines
Common on permanent molars or cingulum of anterior teeth
Lines of Retzuis

42. What are the clinical ramifications of anodontia?
Cementocytes
11th to 12th weeks
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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.

43. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Odontoblasts
There are none - they are lost with eruption
Local or systemic or hereditary

44. What are the formative cells for enamel?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementoblasts
The tooth germ
Ameloblasts

45. What are the mature cells for cementum?
Cementocytes
Dental follicle
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
When the gingiva recedes and no actual tooth movement takes place

46. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Apposition of the cementum
During the cap stage
Sphere of enamel on root

47. What are the etiological factors of tubercle?
Hereditary in localized form. endocrine dysfunction is complete
Trauma - pressure or metabolic disease
The ameloblasts
Oral epithelium

48. What are the etiological factors for micro/macrodontia?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Hereditary in localized form. endocrine dysfunction is complete
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
During the cap stage

49. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
4 types
Dentin secreting cells (odontoblats)
Proliferation - differentiation - morphogenesis

50. What is the outer portion of the ectoderm in the initiation stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Faulty development of enamel from interference involving ameloblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Oral epithelium