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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 formative cells for alveolar bone?
Dental tissues fully mineralize to their mature levels.
Tall columnar cells
Osteoblasts
The permanent molars

2. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Epithelial
4 types
Hereditary

3. What is macrodontia?
Initiation
Abnormally large teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla

4. Active eruption
Hereditary
8th week
Oral epithelium
The actual vertical movement of the tooth

5. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
9th to 10th weeks
Epithelial rests of Malassez
Only dentinal tubules with processes

6. Do odontoblasts start their secretion of matrix before the ameloblasts?
Union of 2 adjacent tooth germs
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental tissues fully mineralize to their mature levels.
Commonly involves permanent maxillary lateral incisor and 3rd molars

7. What happens during the appositional stage?
The basement membrane that seperates the enamel organ and dental papilla
Apposition of the cementum
The enamel - dentin - and cementum are secreted in successive layers
Commonly involves permanent maxillary lateral incisor and 3rd molars

8. What are the clinical ramifications of dens in dente?
Faulty development of enamel from interference involving ameloblasts
A bilayer rim that consists only IEE and OEE
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectomesenchyme

9. What else undergoes proliferation in the bud stage besides the dental lamina?
Common with permanent maxillary molars
Morphogenesis
Differentiation - proliferation - morphogenesis
The ectomesenchyme

10. What are the clinical ramifications of concrescence?
Maturation
Common with permanent maxillary molars
Displacement of ameloblasts to root surface
Odontoclasts

11. What happens during the maturation stage?
Enamel secreting cells (ameloblasts)
8th week
Dental tissues fully mineralize to their mature levels.
Arrest and reversal lines

12. What is the cap in the cap stage?
The enamel organ is compressed
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel organ
Development of one or more extra teeth

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

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14. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Outer
The ameloblasts
Union of root structure of two or more teeth by cementum

15. What is matrix?
The permanent molars
Commonly involves permanent maxillary lateral incisor and 3rd molars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dental papilla

16. What is the structure responsible for root development?
The basement membrane
Faulty development of enamel from interference involving ameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The cervical loop

17. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Tall columnar cells
As a result of the apposition of cementum over dentin
Development of one or more extra teeth

18. Where is the enamal organ originally derived from?
The basement membrane
The ectoderm
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Development of one or more extra teeth

19. What is the cementum matrix called?
Enamel
Cementoid
Extra cusp due to effects on enamel organ
Faulty development of enamel from interference involving ameloblasts

20. What is the time span for the bud stage?
4 types
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectomesenchyme - which was influenced by the neural crest cells
8th week

21. What are the incremental lines for enamel?
Cementoblasts
Lines of Retzuis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Bud stage

22. The stellate reticulum is located inner or outer?
Maturation
Outer
Initiation
The tooth germ

23. What is concrescence?
Union of root structure of two or more teeth by cementum
Local or systemic or hereditary
Inner
The enamel organ

24. What is the predominate process of the cap stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dens in dente - gemination - tubercle - and fusion
The enamel organ - dental papilla - dental sac
Morphogenesis

25. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Hereditary
Enamel organ
The basement membrane
Cementoblasts

26. What are the etiological factors for supernumerary teeth?
Hereditary
The stellate reticulum
Tooth germ tries to divide
Sphere of enamel on root

27. What are the clinical ramifications of supernumerary teeth?
Enamel
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Faulty development of enamel from interference involving ameloblasts
Trauma - pressure or metabolic disease

28. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Tooth germ
The dental sac
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane

29. What are the etiological factors of enamel dysplasia?
Epithelial rests of Malassez
6th to 7th weeks
Local or systemic or hereditary
The basement membrane

30. What stage does supernumerary teeth occur?
Bud stage
Hereditary in localized form. endocrine dysfunction is complete
Initiation
Odontoblasts

31. What hard tissue is innervated by nerves?
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 Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
There are none - they are lost with eruption
Dentin and alveolar bone

32. What is the site for the future dentioenamel junction?
Cuboidal cells
Initiation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The basement membrane that seperates the enamel organ and dental papilla

33. What are the etiological factors for dens in dente and gemination?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
As a result of the apposition of cementum over dentin
Hereditary

34. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Induction - proliferation
Lines of Retzuis
Cementocytes

35. When does dens in dente occur?
Odontogenesis
Cementoblasts
9th to 10th weeks
During the cap stage

36. What is an enamel pearl?
Sphere of enamel on root
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The cervical loop
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

37. What is microdontia?
Maturation
The outer enamel epithelium
Abnormally small teeth
The cementum - PDL - and alveolar bone

38. What is another name for the dental sac?
May be confused as calculus deposit on root
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
There are none - they are lost with eruption
Dental follicle

39. What is the embryological background for enamel?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel organ
Cementocytes
Preameloblasts

40. When does the tooth bud become a tooth germ?
There are none - they are lost with eruption
In the cap stage
Differentiation
The basement membrane that seperates the enamel organ and dental papilla

41. Where is the dental papilla originally derived from?
Odontoblasts
Abnormally large teeth
The ectomesenchyme - which was influenced by the neural crest cells
Enamel organ

42. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Tooth germ tries to divide
Epithelial rests of Malassez
Enamel pearl - enamel dysplasia - and concresence

43. Where is the dental sac originally derived from?
The ectomesenchyme
Common with permanent maxillary molars
Differentiation - proliferation - morphogenesis
Oral epithelium

44. What happens during the apposition stage?
Proliferation
Dental tissues secreted as matrix in successive layers.
The enamel organ
Enamel

45. How many types of cells are found in the enamel organ in the bell stage?
Epithelial rests of Malassez
A mineralized cylinder - the dentinal tubule
The actual vertical movement of the tooth
4 types

46. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Abnormally large teeth
Dental papilla
The cementum - PDL - and alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

47. What do the odontoblasts do?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ameloblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Union of 2 adjacent tooth germs

48. What is tubercle?
8th week
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
Extra cusp due to effects on enamel organ
Enamel pearl - enamel dysplasia - and concresence

49. What stage does the dental tissues subsequently fully mineralize
Dentin secreting cells (odontoblats)
Enamel organ invaginates into the dental papilla
Maturation
Displacement of ameloblasts to root surface

50. What wll the inner enamel epithelium differentiate into?
The basement membrane
Development of one or more extra teeth
Enamel secreting cells (ameloblasts)
Imbrication lines of von Ebner