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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 etiological factors of enamel dysplasia?
Local or systemic or hereditary
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ameloblasts place an acellular dental cuticle on the new enamel surface
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

2. What is matrix?
Union of root structure of two or more teeth by cementum
It disintegrates as the developing oral mucosa comes to line the oral cavity
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Displacement of ameloblasts to root surface

3. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The apposition of the enamel matrix
As a result of the apposition of cementum over dentin
The basement membrane
Odontoclasts

4. What is the time span for the cap stage?
9th to 10th weeks
Tall columnar cells
Cementoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

5. The oral epithelium is induced by the ectomesenchyme to produce what?
Sphere of enamel on root
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The dental lamina
Cementocytes

6. What are the clinical ramifications of concrescence?
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.
Common with permanent maxillary molars
The actual vertical movement of the tooth

7. What is the embryological background for enamel?
Abnormally small teeth
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
Enamel organ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

8. What kind of cells reside in the stratum intermediate?
Traumatic injury or crowding of teeth
Hereditary in localized form. endocrine dysfunction is complete
Ameloblasts
Compressed layer of flat to cuboidal cells

9. What are the etiological factors for enamel pearl?
Tall columnar cells
Arrest and reversal lines
Displacement of ameloblasts to root surface
Faulty development of enamel from interference involving ameloblasts

10. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The stellate reticulum
Cuboidal cells
The ameloblasts place an acellular dental cuticle on the new enamel surface
Union of 2 adjacent tooth germs

11. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
Dental papilla
Dens in dente - gemination - tubercle - and fusion
The ameloblasts place an acellular dental cuticle on the new enamel surface

12. What are the clinical ramifications of supernumerary teeth?
Proliferation - differentiation - morphogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Abnormally large 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

13. What are the etiological factors for supernumerary teeth?
Enamel organ invaginates into the dental papilla
Odontoclasts
Cementocytes
Hereditary

14. When does macro/microdontia occur?
Lines of Retzuis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Bud stage
Enamel

15. What are the cell layers found in the enamel organ in the bell stage?
Cementocytes
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Displacement of ameloblasts to root surface
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

16. What is the predominate process of the cap stage?
Into odontoblasts
Lines of Retzuis
Displacement of ameloblasts to root surface
Morphogenesis

17. What is gemination?
Tooth germ tries to divide
Oral epithelium
6th to 7th weeks
Differentiation - proliferation - morphogenesis

18. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
The apposition of the enamel matrix
Apposition of the cementum
Cementoid

19. What are the incremental lines for dentin?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel - dentin - and cementum are secreted in successive layers
Imbrication lines of von Ebner

20. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The ectomesenchyme
The basement membrane
Epithelial
Arrest and reversal lines

21. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The dental sac
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Osteoblasts

22. How many types of cells are found in the enamel organ in the bell stage?
4 types
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
Osteocytes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

23. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Traumatic injury or crowding of teeth
Hereditary in localized form. endocrine dysfunction is complete
Dental papilla

24. What are succedaneous teeth?
As a result of the apposition of cementum over dentin
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel organ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

25. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Pressure on the area
Hereditary
It disintegrates as the developing oral mucosa comes to line the oral cavity
The bud stage

26. What processes are involved with the apposition stage?
Induction - proliferation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The outer cells of the dental papilla and the central cells of the dental papilla
Dental papilla

27. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
The outer enamel epithelium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Development of one or more extra teeth

28. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Preameloblasts
A bilayer rim that consists only IEE and OEE

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

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30. The preameloblasts induce dental papilla cells to differentiate into what?
Connective
Into odontoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The outer cells of the dental papilla and the central cells of the dental papilla

31. What are the clinical ramifications of anodontia?
Osteoblasts
Extra cusp due to effects on enamel organ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

32. What happens during the appositional stage?
Cementocytes
Connective
The enamel organ
The enamel - dentin - and cementum are secreted in successive layers

33. What type of tissue is enamel?
Cementoid
Epithelial
Odontoblasts
In the cap stage

34. What is macrodontia?
Abnormally large teeth
Dental tissues secreted as matrix in successive layers.
Epithelial
The dental lamina

35. What is the predominate process in the bell stage?
Absence of single or multiple teeth
Differentiation
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

36. What is cementogenisis?
Cementocytes
The bud stage
Apposition of the cementum
Abnormally small teeth

37. Where is the enamal organ originally derived from?
Differentiation - proliferation - morphogenesis
The ectoderm
Abnormally large teeth
In the cap stage

38. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
It disintegrates as the developing oral mucosa comes to line the oral cavity
In the cap stage
Enamel pearl - enamel dysplasia - and concresence

39. What is the embryological background for dentin - cementum and alveolar bone?
Enamel
Preameloblasts
The stellate reticulum
Dental papilla

40. What are the etiological factors for anodontia?
Faulty development of enamel from interference involving ameloblasts
The cementum - PDL - and alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
May be confused as calculus deposit on root

41. The stellate reticulum is located inner or outer?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Outer
The ectomesenchyme - which was influenced by the neural crest cells
Pressure on the area

42. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Epithelial rests of Malassez
The dental sac
Inner
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.

43. What stage does supernumerary teeth occur?
Initiation
Alveolar bone
Cementoblasts
The ectomesenchyme - which was influenced by the neural crest cells

44. What is an enamel pearl?
Sphere of enamel on root
Enamel
Development of one or more extra teeth
The ectoderm

45. Passive eruption
The basement membrane that seperates the enamel organ and dental papilla
When the gingiva recedes and no actual tooth movement takes place
The basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

46. How is the dentinocemental junction formed?
Enamel
Apposition of the cementum
Cementocytes
As a result of the apposition of cementum over dentin

47. What is the cap in the cap stage?
The enamel organ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The tooth germ
Enamel pearl - enamel dysplasia - and concresence

48. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Initiation stage
Trauma - pressure or metabolic disease

49. What is the main process involved in the bud stage?
The ectomesenchyme
Induction
It disintegrates as the developing oral mucosa comes to line the oral cavity
Proliferation

50. What are the developmental disturbances of the cap stage?
4 types
Dens in dente - gemination - tubercle - and fusion
The enamel - dentin - and cementum are secreted in successive layers
Abnormally large teeth