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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?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Induction
The tooth germ
Initiation stage

2. What will the inner cells of the dental lamina differentiates into?
The cervical loop
Absence of single or multiple teeth
The primordium of the pulp
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

3. What is the predominate process in the bell stage?
Pressure on the area
Future dentin and pulp tissue
The basement membrane
Differentiation

4. What are the etiological factors for micro/macrodontia?
Inner
Hereditary in localized form. endocrine dysfunction is complete
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

5. What are the odontoblastic processes is contained in what?
The basement membrane that seperates the enamel organ and dental papilla
A mineralized cylinder - the dentinal tubule
There is unequal growth in different parts of the tooth bud
Compressed layer of flat to cuboidal cells

6. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla
Trauma - pressure or metabolic disease
Dentin and alveolar bone

7. What are the mature cells for enamel?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Development of one or more extra teeth
There are none - they are lost with eruption
11th to 12th weeks

8. What are the clinical ramifications?
Maturation
Odontoblastic process
Common on permanent molars or cingulum of anterior teeth
The enamel organ

9. What is the function of the Hertwig's epithelial root sheath?
Maturation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Odontoblastic process
Cementoblasts

10. What is the predominate process of the cap stage?
Enamel
Preameloblasts
The permanent molars
Morphogenesis

11. Active eruption
Pressure on the area
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel pearl - enamel dysplasia - and concresence
The actual vertical movement of the tooth

12. What are the clinical ramifications of supernumerary teeth?
Dental papilla
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The outer cells of the dental papilla and the central cells of the dental papilla

13. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Maturation
A bilayer rim that consists only IEE and OEE

14. What is fusion?
Union of 2 adjacent tooth germs
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The enamel organ
Alveolar bone

15. When does the process of root development take place?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Tall columnar cells
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

16. What are the clinical ramifications of gemination?

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17. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel - dentin - and cementum are secreted in successive layers
6th to 7th weeks
Apposition of the cementum

18. What are the clinical ramifications of enamel pearl?
Tooth germ tries to divide
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cuboidal cells
May be confused as calculus deposit on root

19. What is the time span for the bud stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Displacement of ameloblasts to root surface
8th week
Enamel

20. What happens during the cap stage?
In the cap stage
The bud stage
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.
Traumatic injury or crowding of teeth

21. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Odontoblastic process
Epithelial rests of Malassez
Only dentinal tubules with processes

22. What are the mature cells for dentin?
Future dentin and pulp tissue
Absence of single or multiple teeth
Only dentinal tubules with processes
Development of one or more extra teeth

23. What hard tissue has vascularity?
Tooth germ
Alveolar bone
Osteoblasts
In the cap stage

24. What is the time span for initiation?
Displacement of ameloblasts to root surface
6th to 7th weeks
The ameloblasts place an acellular dental cuticle on the new enamel surface
In the cap stage

25. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer cells of the dental papilla and the central cells of the dental papilla
Only dentinal tubules with processes

26. What are the formative cells for dentin?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Odontoblasts
Epithelial
Proliferation

27. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Ameloblasts
Imbrication lines of von Ebner
The stellate reticulum

28. What is dens in dente?
The permanent molars
Absence of single or multiple teeth
Preameloblasts
Enamel organ invaginates into the dental papilla

29. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane that seperates the enamel organ and dental papilla
Odontoblasts
Induction

30. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity
4 types
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

31. How is the dentinocemental junction formed?
4 types
As a result of the apposition of cementum over dentin
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme

32. What kind of cells reside in the stratum intermediate?
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
Compressed layer of flat to cuboidal cells
Maturation
Differentiation - proliferation - morphogenesis

33. What happens during the maturation stage?
Tall columnar cells
Cementoblasts
Proliferation - differentiation - morphogenesis
Dental tissues fully mineralize to their mature levels.

34. What is another name for the dental sac?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental follicle
Dens in dente - gemination - tubercle - and fusion
Connective

35. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Arrest and reversal lines

36. In the cap stage the tooth bud does not grow - what happens?
Enamel
Trauma - pressure or metabolic disease
Common with permanent maxillary molars
There is unequal growth in different parts of the tooth bud

37. What are the etiological factors for dens in dente and gemination?
Arrest and reversal lines
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Hereditary
Inner

38. What will the dental papilla eventually form?
Future dentin and pulp tissue
The cementum - PDL - and alveolar bone
Arrest and reversal lines
Hereditary in localized form. endocrine dysfunction is complete

39. What is the main process involved in the bud stage?
Proliferation
Union of 2 adjacent tooth germs
Tall columnar cells
The ameloblasts place an acellular dental cuticle on the new enamel surface

40. What are the etiological factors of tubercle?
The outer enamel epithelium
Trauma - pressure or metabolic disease
The ectomesenchyme - which was influenced by the neural crest cells
Extra cusp due to effects on enamel organ

41. What are the formative cells for cementum?
Connective
Cementoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Oral epithelium

42. What are the incremental lines for dentin?
Cementoblasts
Traumatic injury or crowding of teeth
Initiation stage
Imbrication lines of von Ebner

43. What kind of cells occur in the inner enamel epithelium?
The basement membrane
Preameloblasts
Tall columnar cells
The apposition of the enamel matrix

44. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
In the cap stage
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ameloblasts place an acellular dental cuticle on the new enamel surface
Absence of single or multiple teeth

45. Where is the enamal organ originally derived from?
Dentin and alveolar bone
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ectoderm
Dental follicle

46. What are the etiological factors of enamel dysplasia?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Epithelial
Local or systemic or hereditary
Cementocytes

47. What is the embryological background for enamel?
Odontogenesis
The tooth germ
Enamel organ
Differentiation - proliferation - morphogenesis

48. What are the clinical ramifications of concrescence?
Differentiation
When the gingiva recedes and no actual tooth movement takes place
Commonly involves permanent maxillary lateral incisor and 3rd molars
Common with permanent maxillary molars

49. What happens during initiation?
Dental follicle
The basement membrane
Dental tissues secreted as matrix in successive layers.
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

50. What are the incremental lines for enamel?
Dental tissues fully mineralize to their mature levels.
Lines of Retzuis
Pressure on the area
Common with permanent maxillary molars