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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 process involved in the maturation stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Development of one or more extra teeth
Maturation
The tooth germ

2. What happens during the cap stage?
When the gingiva recedes and no actual tooth movement takes place
Osteoblasts
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.
Cementocytes

3. What are the formative cells for dentin?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontoblasts
The ectoderm
The cementum - PDL - and alveolar bone

4. What happens during initiation?
Cementocytes
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
In the cap stage
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

5. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoid
Cementoblasts
Proliferation - differentiation - morphogenesis
Connective

6. Where is the enamal organ originally derived from?
Differentiation - proliferation - morphogenesis
The dental lamina
Morphogenesis
The ectoderm

7. What is the structure responsible for root development?
Cementoid
The cervical loop
Common with permanent maxillary molars
6th to 7th weeks

8. What are the clinical ramifications of supernumerary teeth?
Initiation
Induction
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
When the gingiva recedes and no actual tooth movement takes place

9. What happens during the apposition stage?
Dens in dente - gemination - tubercle - and fusion
Cuboidal cells
Compressed layer of flat to cuboidal cells
Dental tissues secreted as matrix in successive layers.

10. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Induction
Proliferation - differentiation - morphogenesis

11. What hard tissue has vascularity?
Alveolar bone
Displacement of ameloblasts to root surface
The enamel organ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

12. What are the formative cells for cementum?
Lines of Retzuis
Cementoblasts
Enamel pearl - enamel dysplasia - and concresence
The cementum - PDL - and alveolar bone

13. What processes are involved with the apposition stage?
Odontogenesis
Induction - proliferation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

14. What else undergoes proliferation in the bud stage besides the dental lamina?
Dental follicle
Initiation
The apposition of the enamel matrix
The ectomesenchyme

15. What is the primordium of the tooth?
The enamel organ is compressed
The tooth germ
May be confused as calculus deposit on root
Apposition of the cementum

16. When does macro/microdontia occur?
Enamel
Bud stage
Lines of Retzuis
The tooth germ

17. What is the cementum matrix called?
Apposition of the cementum
Only dentinal tubules with processes
Cementoid
Oral epithelium

18. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Traumatic injury or crowding of teeth
Trauma - pressure or metabolic disease
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

19. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ameloblasts place an acellular dental cuticle on the new enamel surface
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Hereditary in localized form. endocrine dysfunction is complete

20. What are the incremental lines for cementum and alveolar bone?
The ectoderm
Arrest and reversal lines
Maturation
Dental tissues fully mineralize to their mature levels.

21. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Odontoblastic process
The bud stage
The dental lamina
Commonly involves permanent maxillary lateral incisor and 3rd molars

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

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23. What wll the inner enamel epithelium differentiate into?
May be confused as calculus deposit on root
Enamel secreting cells (ameloblasts)
The ameloblasts
The outer cells of the dental papilla and the central cells of the dental papilla

24. What stage does supernumerary teeth occur?
Ameloblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Initiation
Oral epithelium

25. What are the clinical ramifications?
Odontoclasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cementoblasts
Common on permanent molars or cingulum of anterior teeth

26. Where is the dental sac originally derived from?
Proliferation
6th to 7th weeks
Dental tissues secreted as matrix in successive layers.
The ectomesenchyme

27. What is an enamel pearl?
Sphere of enamel on root
The basement membrane
Hereditary
Enamel secreting cells (ameloblasts)

28. What are the processes involved in the cap stage?
There are none - they are lost with eruption
Dentin and alveolar bone
The tooth germ
Proliferation - differentiation - morphogenesis

29. What are the etiological factors for fusion?
When the gingiva recedes and no actual tooth movement takes place
The enamel organ is compressed
A mineralized cylinder - the dentinal tubule
Pressure on the area

30. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
The ameloblasts
Displacement of ameloblasts to root surface
Hereditary in localized form. endocrine dysfunction is complete

31. What is amelogenisis?
May be confused as calculus deposit on root
The apposition of the enamel matrix
Dens in dente - gemination - tubercle - and fusion
Bud stage

32. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Trauma - pressure or metabolic disease
Abnormally small teeth
Tooth germ

33. What are the clinical ramifications of enamel dysplasia?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The apposition of the enamel matrix
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

34. What are the clinical ramifications of enamel pearl?
Faulty development of enamel from interference involving ameloblasts
There are none - they are lost with eruption
May be confused as calculus deposit on root
The cementum - PDL - and alveolar bone

35. What is the function of the Hertwig's epithelial root sheath?
Future dentin and pulp tissue
Enamel pearl - enamel dysplasia - and concresence
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Outer

36. Passive eruption
Enamel pearl - enamel dysplasia - and concresence
When the gingiva recedes and no actual tooth movement takes place
Odontoclasts
The basement membrane that seperates the enamel organ and dental papilla

37. What are the etiological factors for anodontia?
Maturation
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
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ameloblasts

38. What are the clinical ramifications of gemination?

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39. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Tall columnar cells
Induction
Odontoblastic process
Proliferation - differentiation - morphogenesis

40. What will the dental papilla eventually form?
Preameloblasts
Future dentin and pulp tissue
Only dentinal tubules with processes
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

41. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
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.
The basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

42. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Arrest and reversal lines
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

43. What is concrescence?
Hereditary
Cuboidal cells
Union of root structure of two or more teeth by cementum
The cementum - PDL - and alveolar bone

44. What is the time span for the bell stage?
Future dentin and pulp tissue
Extra cusp due to effects on enamel organ
11th to 12th weeks
Morphogenesis

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

46. What are the etiological factors for supernumerary teeth?
The outer enamel epithelium
Morphogenesis
Hereditary
The basement membrane

47. Active eruption
The actual vertical movement of the tooth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
6th to 7th weeks
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

48. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Maturation
Osteocytes
The basement membrane

49. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Connective
Dentin secreting cells (odontoblats)
Initiation stage

50. What are the major components of the tooth germ?
Enamel pearl - enamel dysplasia - and concresence
Differentiation - proliferation - morphogenesis
Cuboidal cells
The enamel organ - dental papilla - dental sac