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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 tubercle?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel organ
Extra cusp due to effects on enamel organ
Initiation stage

2. What are the etiological factors for enamel pearl?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Displacement of ameloblasts to root surface
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
11th to 12th weeks

3. What is the predominate process of the cap stage?
Odontoblasts
Morphogenesis
Differentiation
Imbrication lines of von Ebner

4. What are the mature cells for cementum?
Odontoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementocytes
The apposition of the enamel matrix

5. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Sphere of enamel on root

6. What are the mature cells for alveolar bone?
Osteocytes
The dental sac
Common on permanent molars or cingulum of anterior teeth
Dental follicle

7. What is the time span for initiation?
6th to 7th weeks
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
Arrest and reversal lines
The bud stage

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

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9. What kind of cells reside in the stratum intermediate?
Enamel organ
Compressed layer of flat to cuboidal cells
Dental tissues secreted as matrix in successive layers.
Oral epithelium

10. The oral epithelium is induced by the ectomesenchyme to produce what?
Faulty development of enamel from interference involving ameloblasts
The ectomesenchyme
A bilayer rim that consists only IEE and OEE
The dental lamina

11. The stratum intermediate is located inner or outer?
Union of 2 adjacent tooth germs
Inner
The enamel organ - dental papilla - dental sac
Dental papilla

12. What is the structure responsible for root development?
The enamel organ - dental papilla - dental sac
The cervical loop
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The ectomesenchyme - which was influenced by the neural crest cells

13. What is the cementum matrix called?
Union of root structure of two or more teeth by cementum
Cementoid
4 types
The cementum - PDL - and alveolar bone

14. What are the mature cells for enamel?
Into odontoblasts
There are none - they are lost with eruption
Absence of single or multiple teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

15. What hard tissue is can not have tissue formation after eruption?
Enamel
Epithelial rests of Malassez
The primordium of the pulp
Bud stage

16. What is the main process involved in initiation?
A bilayer rim that consists only IEE and OEE
Induction
Outer
Dens in dente - gemination - tubercle - and fusion

17. What are the etiological factors for dens in dente and gemination?
Enamel organ invaginates into the dental papilla
Enamel pearl - enamel dysplasia - and concresence
Hereditary
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

18. In the cap stage the tooth bud does not grow - what happens?
Pressure on the area
Abnormally small teeth
There is unequal growth in different parts of the tooth bud
Cementocytes

19. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Preameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The cementum - PDL - and alveolar bone

20. What is dens in dente?
Tooth germ tries to divide
Alveolar bone
A mineralized cylinder - the dentinal tubule
Enamel organ invaginates into the dental papilla

21. What are the formative cells for alveolar bone?
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
Compressed layer of flat to cuboidal cells
Osteoblasts

22. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Dens in dente - gemination - tubercle - and fusion
Osteoblasts
Hereditary

23. Active eruption
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Imbrication lines of von Ebner
The actual vertical movement of the tooth
Tall columnar cells

24. Do odontoblasts start their secretion of matrix before the ameloblasts?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The cervical loop
Local or systemic or hereditary

25. What is fusion?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The basement membrane
The dental lamina
Union of 2 adjacent tooth germs

26. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Apposition of the cementum
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane
8th week

27. What are the cell layers found in the enamel organ in the bell stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Faulty development of enamel from interference involving ameloblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity

28. Which layer in the bell stage has star shaped cells?
Oral epithelium
The stellate reticulum
It disintegrates as the developing oral mucosa comes to line the oral cavity
Preameloblasts

29. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The cementum - PDL - and alveolar bone
The enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Tooth germ

30. When does dens in dente occur?
During the cap stage
The enamel organ - dental papilla - dental sac
Common on permanent molars or cingulum of anterior teeth
The actual vertical movement of the tooth

31. What are the formative cells for cementum?
Cementoblasts
Epithelial
Cementocytes
Oral epithelium

32. What are the incremental lines for enamel?
Lines of Retzuis
8th week
Trauma - pressure or metabolic disease
6th to 7th weeks

33. What are the etiological factors of enamel dysplasia?
Only dentinal tubules with processes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Initiation stage
Local or systemic or hereditary

34. 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
Development of one or more extra teeth
The ectomesenchyme - which was influenced by the neural crest cells
Odontoclasts

35. What is macrodontia?
Future dentin and pulp tissue
Abnormally large teeth
Proliferation
Odontogenesis

36. What will the dental papilla eventually form?
Future dentin and pulp tissue
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Ameloblasts
Hereditary in localized form. endocrine dysfunction is complete

37. What is the embryological background for dentin - cementum and alveolar bone?
The outer enamel epithelium
The basement membrane that seperates the enamel organ and dental papilla
Dental papilla
There are none - they are lost with eruption

38. What are the clinical ramifications of dens in dente?
The actual vertical movement of the tooth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Apposition of the cementum
Only dentinal tubules with processes

39. When does macro/microdontia occur?
8th week
Displacement of ameloblasts to root surface
Bud stage
Tall columnar cells

40. What type of tissue is dentin - cementum - and alveolar bone?
8th week
Local or systemic or hereditary
The basement membrane that seperates the enamel organ and dental papilla
Connective

41. What is the time span for the bud stage?
The basement membrane
8th week
The ectoderm
There is unequal growth in different parts of the tooth bud

42. What is the time span for the bell stage?
11th to 12th weeks
Odontoblastic process
Osteoblasts
Development of one or more extra teeth

43. What are entrapped cementoblasts called?
Cementocytes
Arrest and reversal lines
Maturation
There are none - they are lost with eruption

44. What are the clinical ramifications?
Induction - proliferation
The basement membrane
The ameloblasts
Common on permanent molars or cingulum of anterior teeth

45. What are supernumerary teeth?
Development of one or more extra teeth
Dens in dente - gemination - tubercle - and fusion
Odontogenesis
Enamel organ invaginates into the dental papilla

46. What are the development disturbances of the apposition and maturation stages?
A mineralized cylinder - the dentinal tubule
Enamel pearl - enamel dysplasia - and concresence
Odontogenesis
Outer

47. What happens during the cap stage?
Odontoclasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Cementocytes
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.

48. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
The outer enamel epithelium
Dental tissues secreted as matrix in successive layers.
The outer cells of the dental papilla and the central cells of the dental papilla

49. What are the clinical ramifications of supernumerary teeth?
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
Odontoblasts
Future dentin and pulp tissue

50. What layer serves as protection for the enamel organ?
Tooth germ
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.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The outer enamel epithelium