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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 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
Common with permanent maxillary molars
Epithelial rests of Malassez
Initiation

2. 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
Oral epithelium
The permanent molars
The ameloblasts place an acellular dental cuticle on the new enamel surface

3. The oral epithelium is induced by the ectomesenchyme to produce what?
The ectoderm
The cementum - PDL - and alveolar bone
The dental lamina
Maturation

4. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Enamel pearl - enamel dysplasia - and concresence
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Epithelial rests of Malassez

5. What processes are involved with the apposition stage?
Induction - proliferation
The permanent molars
The apposition of the enamel matrix
Ameloblasts

6. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
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
Dental papilla
The permanent molars
Odontoclasts

7. What will the inner cells of the dental lamina differentiates into?
The actual vertical movement of the tooth
The primordium of the pulp
Sphere of enamel on root
Bud stage

8. What is the cap in the cap stage?
The enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ectomesenchyme
Union of 2 adjacent tooth germs

9. What is another name for the dental sac?
Maturation
Extra cusp due to effects on enamel organ
In the cap stage
Dental follicle

10. What are the etiological factors for anodontia?
Sphere of enamel on root
The tooth germ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementocytes

11. What are the developmental disturbances of the cap stage?
Union of 2 adjacent tooth germs
Maturation
Dens in dente - gemination - tubercle - and fusion
Cementocytes

12. What will the dental papilla eventually form?
The stellate reticulum
Local or systemic or hereditary
Future dentin and pulp tissue
The primordium of the pulp

13. What are the mature cells for enamel?
There are none - they are lost with eruption
Ameloblasts
Tall columnar cells
Trauma - pressure or metabolic disease

14. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Cementoid
Oral epithelium
There is unequal growth in different parts of the tooth bud

15. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel secreting cells (ameloblasts)
Cementoid
Common on permanent molars or cingulum of anterior teeth
Preameloblasts

16. What is an enamel pearl?
Arrest and reversal lines
Differentiation
Sphere of enamel on root
Abnormally large teeth

17. What happens during the appositional stage?
Hereditary
The enamel - dentin - and cementum are secreted in successive layers
Cementoblasts
The primordium of the pulp

18. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Cuboidal cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Enamel secreting cells (ameloblasts)
The ameloblasts place an acellular dental cuticle on the new enamel surface

19. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Odontoblastic process
Cementoid
The cementum - PDL - and alveolar bone

20. What are the formative cells for alveolar bone?
Enamel pearl - enamel dysplasia - and concresence
When the gingiva recedes and no actual tooth movement takes place
Pressure on the area
Osteoblasts

21. The stellate reticulum is located inner or outer?
Outer
The basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
In the cap stage

22. What are the mature cells for dentin?
Morphogenesis
Maturation
Proliferation - differentiation - morphogenesis
Only dentinal tubules with processes

23. What hard tissue is can not have tissue formation after eruption?
When the gingiva recedes and no actual tooth movement takes place
A mineralized cylinder - the dentinal tubule
Cuboidal cells
Enamel

24. Passive eruption
Faulty development of enamel from interference involving ameloblasts
Dental tissues secreted as matrix in successive layers.
Imbrication lines of von Ebner
When the gingiva recedes and no actual tooth movement takes place

25. How is the reduced enamel epithelium created?
Hereditary
The enamel organ is compressed
Dentin secreting cells (odontoblats)
Cementocytes

26. When does the process of root development take place?
Dental papilla
Dentin secreting cells (odontoblats)
Pressure on the area
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

27. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The basement membrane
Cementoblasts
Inner
Abnormally large teeth

28. Where does the primordium of the permanent dentition develop?
Enamel organ invaginates into the dental papilla
8th week
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
9th to 10th weeks

29. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
The primordium of the pulp
Cementoblasts
Local or systemic or hereditary

30. The stratum intermediate is located inner or outer?
There are none - they are lost with eruption
Local or systemic or hereditary
9th to 10th weeks
Inner

31. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Preameloblasts
Dental tissues fully mineralize to their mature levels.
The ectomesenchyme - which was influenced by the neural crest cells

32. What are the etiological factors of enamel dysplasia?
Displacement of ameloblasts to root surface
Cementocytes
Apposition of the cementum
Local or systemic or hereditary

33. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
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.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

34. What is fusion?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Pressure on the area
Development of one or more extra teeth
Union of 2 adjacent tooth germs

35. What is the time span for the bell stage?
Ameloblasts
Displacement of ameloblasts to root surface
Cementocytes
11th to 12th weeks

36. Active eruption
The actual vertical movement of the tooth
Cuboidal cells
Outer
Epithelial rests of Malassez

37. What is the main process involved in the bud stage?
The enamel - dentin - and cementum are secreted in successive layers
Dens in dente - gemination - tubercle - and fusion
Proliferation
Future dentin and pulp tissue

38. What happens during initiation?
Hereditary in localized form. endocrine dysfunction is complete
The stellate reticulum
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
Dentin and alveolar bone

39. When does dens in dente occur?
Hereditary
The enamel organ
Cementocytes
During the cap stage

40. What else undergoes proliferation in the bud stage besides the dental lamina?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Future dentin and pulp tissue
Lines of Retzuis
The ectomesenchyme

41. What are the clinical ramifications of enamel dysplasia?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
May be confused as calculus deposit on root
Cementoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

42. What is the cementum matrix called?
Odontogenesis
The enamel organ
Cementoid
Extra cusp due to effects on enamel organ

43. What are the clinical ramifications of micro/macrodontia?
The bud stage
The ectomesenchyme
Absence of single or multiple teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars

44. In the cap stage the tooth bud does not grow - what happens?
Preameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
There is unequal growth in different parts of the tooth bud

45. What type of tissue is enamel?
Epithelial
The ectoderm
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

46. What is the predominate process of the cap stage?
The stellate reticulum
Initiation
Morphogenesis
Enamel pearl - enamel dysplasia - and concresence

47. What are the formative cells for cementum?
Hereditary
Cementoblasts
The cervical loop
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

48. What is enamel dysplasia?
The cervical loop
Faulty development of enamel from interference involving ameloblasts
The permanent molars
The ectomesenchyme

49. How many types of cells are found in the enamel organ in the bell stage?
4 types
Enamel organ invaginates into the dental papilla
A bilayer rim that consists only IEE and OEE
The outer cells of the dental papilla and the central cells of the dental papilla

50. What are the mature cells for alveolar bone?
The ameloblasts
Osteocytes
In the cap stage
Dens in dente - gemination - tubercle - and fusion