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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 happens during initiation?
Cementoid
Osteoblasts
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
Preameloblasts

2. How is the reduced enamel epithelium created?
There are none - they are lost with eruption
The enamel organ is compressed
Ameloblasts
Only dentinal tubules with processes

3. What are the clinical ramifications of dens in dente?
4 types
Proliferation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The apposition of the enamel matrix

4. What kind of cells occur in the inner enamel epithelium?
Tooth germ
Tall columnar cells
Development of one or more extra teeth
The ectomesenchyme

5. What is the main process involved in the bud stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Proliferation
Union of root structure of two or more teeth by cementum
May be confused as calculus deposit on root

6. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Common with permanent maxillary molars
During the cap stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

7. What do the odontoblasts do?
The enamel organ is compressed
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Arrest and reversal lines
A bilayer rim that consists only IEE and OEE

8. What are the mature cells for alveolar bone?
Proliferation
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
Osteocytes

9. What are the etiological factors for supernumerary teeth?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Tooth germ
Hereditary
The ectomesenchyme

10. What are the mature cells for enamel?
When the gingiva recedes and no actual tooth movement takes place
The enamel organ - dental papilla - dental sac
There are none - they are lost with eruption
Abnormally small teeth

11. What stage does supernumerary teeth occur?
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
Initiation
Initiation stage

12. What will the dental sac give rise to?
Union of root structure of two or more teeth by cementum
Epithelial
Induction
The cementum - PDL - and alveolar bone

13. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
Dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental tissues secreted as matrix in successive layers.

14. What are the clinical ramifications of enamel pearl?
Enamel
May be confused as calculus deposit on root
Extra cusp due to effects on enamel organ
The enamel organ - dental papilla - dental sac

15. What is an enamel pearl?
Sphere of enamel on root
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Enamel secreting cells (ameloblasts)
Enamel

16. What are the cell layers found in the enamel organ in the bell stage?
Odontogenesis
8th week
Dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

17. What are the clinical ramifications of enamel dysplasia?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The basement membrane
Outer
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

18. What is macrodontia?
Abnormally large teeth
Osteoblasts
Dentin and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers

19. What is the predominate process in the bell stage?
Imbrication lines of von Ebner
Extra cusp due to effects on enamel organ
The primordium of the pulp
Differentiation

20. What will the dental papilla eventually form?
There is unequal growth in different parts of the tooth bud
The basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
Future dentin and pulp tissue

21. Passive eruption
A bilayer rim that consists only IEE and OEE
When the gingiva recedes and no actual tooth movement takes place
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental papilla

22. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The basement membrane
Odontoblastic process
The ectomesenchyme
The outer cells of the dental papilla and the central cells of the dental papilla

23. What are the mature cells for dentin?
The outer cells of the dental papilla and the central cells of the dental papilla
Morphogenesis
Trauma - pressure or metabolic disease
Only dentinal tubules with processes

24. Where is the dental papilla originally derived from?
During the cap stage
Common on permanent molars or cingulum of anterior teeth
The ectomesenchyme - which was influenced by the neural crest cells
Pressure on the area

25. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Common on permanent molars or cingulum of anterior teeth
Initiation
There are none - they are lost with eruption

26. What are the clinical ramifications?
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
The enamel organ is compressed
The ameloblasts place an acellular dental cuticle on the new enamel surface
Common on permanent molars or cingulum of anterior teeth

27. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Ameloblasts
Tooth germ
Extra cusp due to effects on enamel organ

28. When does the tooth bud become a tooth germ?
4 types
In 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.
Compressed layer of flat to cuboidal cells

29. What stage does the dental tissues subsequently fully mineralize
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
4 types
Maturation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

30. Where is the dental sac originally derived from?
Epithelial rests of Malassez
There are none - they are lost with eruption
Cuboidal cells
The ectomesenchyme

31. Which teeth are nonsuccedaneous?
Enamel pearl - enamel dysplasia - and concresence
Proliferation - differentiation - morphogenesis
Epithelial
The permanent molars

32. What hard tissue is can not have tissue formation after eruption?
Common with permanent maxillary molars
Odontogenesis
Cementocytes
Enamel

33. What are the clinical ramifications of gemination?

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34. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Tooth germ tries to divide
Odontogenesis
Differentiation - proliferation - morphogenesis

35. What is the cap in the cap stage?
Morphogenesis
The enamel organ
Extra cusp due to effects on enamel organ
A bilayer rim that consists only IEE and OEE

36. What wll the inner enamel epithelium differentiate into?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The dental lamina
Enamel secreting cells (ameloblasts)

37. What are the formative cells for enamel?
Ameloblasts
Connective
Cementoblasts
Osteocytes

38. What are the clinical ramifications of supernumerary teeth?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
6th to 7th weeks
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ectomesenchyme

39. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The enamel - dentin - and cementum are secreted in successive layers
Differentiation - proliferation - morphogenesis
Connective

40. What is anodontia?
Odontoclasts
Absence of single or multiple teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

41. Active eruption
Outer
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The actual vertical movement of the tooth

42. What is microdontia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ameloblasts
Pressure on the area
Abnormally small teeth

43. The stratum intermediate is located inner or outer?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Inner
Hereditary in localized form. endocrine dysfunction is complete
In the cap stage

44. What are the incremental lines for cementum and alveolar bone?
Hereditary
There is unequal growth in different parts of the tooth bud
Arrest and reversal lines
The tooth germ

45. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Tooth germ tries to divide
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoid
Preameloblasts

46. What is the embryological background for dentin - cementum and alveolar bone?
May be confused as calculus deposit on root
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental papilla
Common on permanent molars or cingulum of anterior teeth

47. What is tubercle?
Extra cusp due to effects on enamel organ
Initiation
Union of 2 adjacent tooth germs
The ectoderm

48. In the cap stage the tooth bud does not grow - what happens?
Osteocytes
The stellate reticulum
There is unequal growth in different parts of the tooth bud
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

49. The oral epithelium is induced by the ectomesenchyme to produce what?
Cementoblasts
The apposition of the enamel matrix
Faulty development of enamel from interference involving ameloblasts
The dental lamina

50. When does the process of root development take place?
Dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Hereditary