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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
9th to 10th weeks
The cervical loop

2. What layer serves as protection for the enamel organ?
Enamel secreting cells (ameloblasts)
The outer enamel epithelium
Preameloblasts
Maturation

3. Which teeth are nonsuccedaneous?
The permanent molars
The outer cells of the dental papilla and the central cells of the dental papilla
Cementocytes
As a result of the apposition of cementum over dentin

4. What is dens in dente?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Enamel organ invaginates into the dental papilla
When the gingiva recedes and no actual tooth movement takes place
Absence of single or multiple teeth

5. What will the inner cells of the dental lamina differentiates into?
Odontogenesis
The primordium of the pulp
Proliferation - differentiation - morphogenesis
Future dentin and pulp tissue

6. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Faulty development of enamel from interference involving ameloblasts
Lines of Retzuis
Inner

7. What are the mature cells for dentin?
Odontoclasts
Only dentinal tubules with processes
The ectomesenchyme - which was influenced by the neural crest cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

8. What happens during the appositional stage?
Tooth germ
Tooth germ tries to divide
The ectomesenchyme
The enamel - dentin - and cementum are secreted in successive layers

9. What is the time span for the cap stage?
9th to 10th weeks
Common on permanent molars or cingulum of anterior teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel organ invaginates into the dental papilla

10. What is the outer portion of the ectoderm in the initiation stage?
Maturation
Oral epithelium
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Only dentinal tubules with processes

11. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Maturation
Outer
Absence of single or multiple teeth

12. What is the embryological background for enamel?
Dental tissues secreted as matrix in successive layers.
The cervical loop
Enamel organ
Common with permanent maxillary molars

13. What is anodontia?
Cementoid
Absence of single or multiple teeth
May be confused as calculus deposit on root
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

14. What happens during the apposition stage?
Into odontoblasts
Osteocytes
Dental tissues secreted as matrix in successive layers.
Dentin secreting cells (odontoblats)

15. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Proliferation
In the cap stage
Initiation

16. Active eruption
Local or systemic or hereditary
Initiation
4 types
The actual vertical movement of the tooth

17. What happens during the cap stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
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 cervical loop
Differentiation - proliferation - morphogenesis

18. When does the process of root development take place?
There is unequal growth in different parts of the tooth bud
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Local or systemic or hereditary
Osteoblasts

19. Where is the dental papilla originally derived from?
Abnormally small teeth
The ectomesenchyme - which was influenced by the neural crest cells
Commonly involves permanent maxillary lateral incisor and 3rd molars
6th to 7th weeks

20. What are the major components of the tooth germ?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Oral epithelium
Hereditary in localized form. endocrine dysfunction is complete
The enamel organ - dental papilla - dental sac

21. What will the dental papilla eventually form?
Connective
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Future dentin and pulp tissue
The basement membrane

22. What is fusion?
Cementocytes
Compressed layer of flat to cuboidal cells
Cementoblasts
Union of 2 adjacent tooth germs

23. What is enamel dysplasia?
Outer
Cementocytes
Faulty development of enamel from interference involving ameloblasts
Apposition of the cementum

24. What are the mature cells for cementum?
Induction
During the cap stage
Cementocytes
The basement membrane

25. What is gemination?
Apposition of the cementum
The basement membrane
Tooth germ tries to divide
Extra cusp due to effects on enamel organ

26. What hard tissue is innervated by nerves?
When the gingiva recedes and no actual tooth movement takes place
Osteocytes
Abnormally small teeth
Dentin and alveolar bone

27. What does the cervical loop consist of?
Dental tissues fully mineralize to their mature levels.
Abnormally large teeth
8th week
A bilayer rim that consists only IEE and OEE

28. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Dental follicle
Bud stage
Preameloblasts

29. What is the time span for the bud stage?
Odontoclasts
8th week
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

30. What are entrapped cementoblasts called?
Cementocytes
The basement membrane
Odontoclasts
Tall columnar cells

31. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Hereditary
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Enamel organ

32. What is cementogenisis?
A bilayer rim that consists only IEE and OEE
Common with permanent maxillary molars
The ectomesenchyme - which was influenced by the neural crest cells
Apposition of the cementum

33. What are succedaneous teeth?
Apposition of the cementum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
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.
Displacement of ameloblasts to root surface

34. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Compressed layer of flat to cuboidal cells
Union of 2 adjacent tooth germs
Tall columnar cells

35. What is matrix?
Alveolar bone
Hereditary in localized form. endocrine dysfunction is complete
Morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

36. What are the clinical ramifications of micro/macrodontia?
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
Commonly involves permanent maxillary lateral incisor and 3rd molars
The bud stage
Induction

37. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Arrest and reversal lines
Dental papilla
Odontoblastic process
There are none - they are lost with eruption

38. The stratum intermediate is located inner or outer?
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
Maturation
The cervical loop
Inner

39. What is another name for the dental sac?
Local or systemic or hereditary
6th to 7th weeks
The basement membrane
Dental follicle

40. What are the etiological factors for fusion?
Trauma - pressure or metabolic disease
Pressure on the area
The actual vertical movement of the tooth
The stellate reticulum

41. What are the incremental lines for cementum and alveolar bone?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Sphere of enamel on root
The enamel organ is compressed
Arrest and reversal lines

42. What are the clinical ramifications of anodontia?
Ameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The primordium of the pulp
4 types

43. What are the etiological factors of enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
During the cap stage
Hereditary in localized form. endocrine dysfunction is complete
Local or systemic or hereditary

44. Where is the dental sac originally derived from?
The stellate reticulum
Cementoid
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme

45. Where is the enamal organ originally derived from?
Dental papilla
The ectoderm
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
Inner

46. What are supernumerary teeth?
The bud stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Development of one or more extra teeth
Tooth germ

47. Tooth development
Oral epithelium
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
Odontogenesis

48. What are the formative cells for enamel?
Ameloblasts
Into odontoblasts
The basement membrane
The dental sac

49. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
The enamel organ is compressed
Common with permanent maxillary molars
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

50. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Differentiation - proliferation - morphogenesis
Hereditary in localized form. endocrine dysfunction is complete
The ameloblasts
Initiation

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Dentistry Tooth Development And Eruption

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