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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 primordium of the tooth?
Sphere of enamel on root
Dental papilla
Initiation stage
The tooth germ

2. What is the outer portion of the ectoderm in the initiation stage?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Oral epithelium
Cementocytes
Hereditary

3. What are supernumerary teeth?
Development of one or more extra teeth
Cementocytes
Odontoblasts
The dental sac

4. When does the process of root development take place?
There are none - they are lost with eruption
Union of 2 adjacent tooth germs
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

5. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Pressure on the area
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontoclasts
The dental lamina

6. What stage does supernumerary teeth occur?
6th to 7th weeks
Alveolar bone
Initiation
The apposition of the enamel matrix

7. What are the development disturbances of the apposition and maturation stages?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary
Enamel pearl - enamel dysplasia - and concresence
As a result of the apposition of cementum over dentin

8. What is tubercle?
8th week
The enamel - dentin - and cementum are secreted in successive layers
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Extra cusp due to effects on enamel organ

9. What are the etiological factors for dens in dente and gemination?
Proliferation
Arrest and reversal lines
Hereditary
Displacement of ameloblasts to root surface

10. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Osteoblasts
The ectomesenchyme - which was influenced by the neural crest cells
Cuboidal cells

11. What will the inner cells of the dental lamina differentiates into?
Dentin secreting cells (odontoblats)
Cuboidal cells
The primordium of the pulp
Cementocytes

12. When does dens in dente occur?
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
The permanent molars
During the cap stage
Pressure on the area

13. What are entrapped cementoblasts called?
Cementocytes
As a result of the apposition of cementum over dentin
The cervical loop
Odontoblastic process

14. Which teeth are nonsuccedaneous?
There is unequal growth in different parts of the tooth bud
Preameloblasts
The permanent molars
The basement membrane that seperates the enamel organ and dental papilla

15. What is the embryological background for dentin - cementum and alveolar bone?
Faulty development of enamel from interference involving ameloblasts
The ectomesenchyme - which was influenced by the neural crest cells
Dental papilla
Alveolar bone

16. The stellate reticulum is located inner or outer?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Sphere of enamel on root
Outer
Epithelial

17. What are the clinical ramifications of concrescence?
Into odontoblasts
Ameloblasts
Dental follicle
Common with permanent maxillary molars

18. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Apposition of the cementum
Tall columnar cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental papilla

19. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Dental papilla
Commonly involves permanent maxillary lateral incisor and 3rd molars
The bud stage

20. What type of tissue is dentin - cementum - and alveolar bone?
Inner
Union of 2 adjacent tooth germs
Connective
The basement membrane

21. What are the etiological factors for enamel pearl?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
9th to 10th weeks
Displacement of ameloblasts to root surface
Enamel

22. What is cementogenisis?
Apposition of the cementum
Dental tissues fully mineralize to their mature levels.
Traumatic injury or crowding of teeth
The ectomesenchyme

23. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Compressed layer of flat to cuboidal cells
In the cap stage
Enamel secreting cells (ameloblasts)

24. What are the major components of the tooth germ?
The basement membrane
Odontoclasts
Induction
The enamel organ - dental papilla - dental sac

25. What is enamel dysplasia?
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.
Morphogenesis
Faulty development of enamel from interference involving ameloblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

26. What are the etiological factors of enamel dysplasia?
8th week
Local or systemic or hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Union of 2 adjacent tooth germs

27. What happens during the bud stage?
Absence of single or multiple teeth
As a result of the apposition of cementum over dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

28. What happens during the cap stage?
Tooth germ
Enamel organ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
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.

29. Do odontoblasts start their secretion of matrix before the ameloblasts?
There is unequal growth in different parts of the tooth bud
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
8th week

30. What are the clinical ramifications of fusion?
Hereditary in localized form. endocrine dysfunction is complete
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Ameloblasts

31. What is the time span for the bud stage?
8th week
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
Pressure on the area
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

32. What are the mature cells for cementum?
Cuboidal cells
Cementocytes
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Lines of Retzuis

33. Where does the primordium of the permanent dentition develop?
Union of root structure of two or more teeth by cementum
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
It disintegrates as the developing oral mucosa comes to line the oral cavity
The dental lamina

34. What are the incremental lines for dentin?
Imbrication lines of von Ebner
The dental lamina
Osteocytes
Dentin and alveolar bone

35. What is the predominate process of 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
Morphogenesis
Enamel organ
The enamel - dentin - and cementum are secreted in successive layers

36. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Absence of single or multiple teeth
Trauma - pressure or metabolic disease
The ameloblasts place an acellular dental cuticle on the new enamel surface

37. The stratum intermediate is located inner or outer?
Inner
The ameloblasts
Apposition of the cementum
Into odontoblasts

38. What is the main process involved in initiation?
The apposition of the enamel matrix
In the cap stage
Induction
The dental sac

39. What type of tissue is enamel?
A mineralized cylinder - the dentinal tubule
11th to 12th weeks
Epithelial
Outer

40. What is another name for the dental sac?
Dental follicle
During the cap stage
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Future dentin and pulp tissue

41. What happens during initiation?
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
There are none - they are lost with eruption
Odontoclasts
8th week

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

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43. What hard tissue is can not have tissue formation after eruption?
Development of one or more extra teeth
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Enamel
Cementoid

44. What are the clinical ramifications of micro/macrodontia?
The basement membrane
8th week
Commonly involves permanent maxillary lateral incisor and 3rd molars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

45. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Trauma - pressure or metabolic disease
Dental tissues secreted as matrix in successive layers.
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Tooth germ

46. What are the formative cells for dentin?
Dental papilla
Odontoblasts
Epithelial rests of Malassez
The primordium of the pulp

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

48. What is amelogenisis?
Tall columnar cells
Alveolar bone
Cuboidal cells
The apposition of the enamel matrix

49. What is gemination?
The enamel organ - dental papilla - dental sac
The cementum - PDL - 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
Tooth germ tries to divide

50. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
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.
Enamel
Epithelial rests of Malassez
Tall columnar cells