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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 amelogenisis?
The apposition of the enamel matrix
Faulty development of enamel from interference involving ameloblasts
Hereditary in localized form. endocrine dysfunction is complete
Outer

2. What are the major components of the tooth germ?
Odontoblastic process
The enamel organ - dental papilla - dental sac
Odontogenesis
11th to 12th weeks

3. Passive eruption
11th to 12th weeks
Hereditary
When the gingiva recedes and no actual tooth movement takes place
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

4. What happens during initiation?
Inner
Cementocytes
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
Tall columnar cells

5. What are the odontoblastic processes is contained in what?
Arrest and reversal lines
A mineralized cylinder - the dentinal tubule
Morphogenesis
The stellate reticulum

6. 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
Trauma - pressure or metabolic disease
Enamel secreting cells (ameloblasts)
Odontoclasts

7. What are the etiological factors for fusion?
The ectomesenchyme - which was influenced by the neural crest cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Pressure on the area
4 types

8. Where does the primordium of the permanent dentition develop?
Only dentinal tubules with processes
8th week
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
4 types

9. When does dens in dente occur?
Odontoclasts
During the cap stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dentin secreting cells (odontoblats)

10. What processes are involved with the apposition stage?
The primordium of the pulp
Common on permanent molars or cingulum of anterior teeth
Induction - proliferation
Union of 2 adjacent tooth germs

11. What is the primordium of the tooth?
Future dentin and pulp tissue
Cementoblasts
The tooth germ
Odontoclasts

12. What is dens in dente?
Epithelial
Bud stage
Enamel organ invaginates into the dental papilla
Future dentin and pulp tissue

13. What are the clinical ramifications of micro/macrodontia?
Lines of Retzuis
The ectomesenchyme
During the cap stage
Commonly involves permanent maxillary lateral incisor and 3rd molars

14. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The permanent molars
Enamel organ invaginates into the dental papilla
Cuboidal cells

15. Where is the dental sac originally derived from?
The ectomesenchyme
Maturation
The outer enamel epithelium
Initiation

16. What are the etiological factors for anodontia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
A mineralized cylinder - the dentinal tubule
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Epithelial

17. What are the incremental lines for dentin?
Abnormally large teeth
Cementocytes
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
Imbrication lines of von Ebner

18. What are the etiological factors for micro/macrodontia?
The enamel - dentin - and cementum are secreted in successive layers
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Hereditary in localized form. endocrine dysfunction is complete
Hereditary

19. What are the etiological factors for dens in dente and gemination?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Traumatic injury or crowding of teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Hereditary

20. What is the time span for the cap stage?
There are none - they are lost with eruption
Epithelial
9th to 10th weeks
During the cap stage

21. What are the etiological factors of enamel dysplasia?
Hereditary
Oral epithelium
Local or systemic or hereditary
The permanent molars

22. What is the time span for the bell stage?
During the cap stage
6th to 7th weeks
11th to 12th weeks
Enamel

23. Which teeth are nonsuccedaneous?
The permanent molars
Initiation stage
The cementum - PDL - and alveolar bone
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

24. What is anodontia?
Absence of single or multiple teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Alveolar bone
Development of one or more extra teeth

25. What processes are involved in the bell stage?
Trauma - pressure or metabolic disease
Enamel organ
Differentiation - proliferation - morphogenesis
Proliferation - differentiation - morphogenesis

26. What does the cervical loop consist of?
Cuboidal cells
Common on permanent molars or cingulum of anterior teeth
A bilayer rim that consists only IEE and OEE
The outer enamel epithelium

27. What is the cap in the cap stage?
Odontoclasts
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 enamel organ
The primordium of the pulp

28. Where is the dental papilla originally derived from?
The outer enamel epithelium
The ameloblasts
The ectomesenchyme - which was influenced by the neural crest cells
Only dentinal tubules with processes

29. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
The basement membrane
The basement membrane
Odontoblastic process

30. What are the incremental lines for enamel?
Enamel
A bilayer rim that consists only IEE and OEE
The enamel - dentin - and cementum are secreted in successive layers
Lines of Retzuis

31. What are entrapped cementoblasts called?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementocytes
Local or systemic or hereditary
Enamel

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

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33. What are the etiological factors of tubercle?
Cementoblasts
Trauma - pressure or metabolic disease
Cementoid
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

34. What will the dental papilla eventually form?
Preameloblasts
Initiation stage
During the cap stage
Future dentin and pulp tissue

35. What are the clinical ramifications of dens in dente?
Enamel
The cervical loop
Induction
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

36. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
The basement membrane that seperates the enamel organ and dental papilla
Imbrication lines of von Ebner
Enamel organ

37. What is the time span for initiation?
Cementocytes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The cementum - PDL - and alveolar bone
6th to 7th weeks

38. What are the clinical ramifications of fusion?
Connective
In the cap stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
9th to 10th weeks

39. What are the mature cells for cementum?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Only dentinal tubules with processes
Common on permanent molars or cingulum of anterior teeth
Cementocytes

40. Do odontoblasts start their secretion of matrix before the ameloblasts?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel secreting cells (ameloblasts)
The outer cells of the dental papilla and the central cells of the dental papilla

41. What stage does supernumerary teeth occur?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Maturation
9th to 10th weeks
Initiation

42. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Cementoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tooth germ
Trauma - pressure or metabolic disease

43. What happens during the bud stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Faulty development of enamel from interference involving ameloblasts
Induction
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

44. What are the clinical ramifications of gemination?

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45. What are the formative cells for alveolar bone?
Preameloblasts
Displacement of ameloblasts to root surface
The ectoderm
Osteoblasts

46. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ameloblasts
Arrest and reversal lines
Development of one or more extra teeth

47. What is fusion?
Union of 2 adjacent tooth germs
A bilayer rim that consists only IEE and OEE
Osteocytes
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

48. What is another name for the dental sac?
Dental follicle
The enamel organ
Pressure on the area
Proliferation - differentiation - morphogenesis

49. How is the dentinocemental junction formed?
The bud stage
Differentiation
Trauma - pressure or metabolic disease
As a result of the apposition of cementum over dentin

50. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Inner
The enamel organ is compressed
Dental papilla
Apposition of the cementum