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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 is the site for the future dentioenamel junction?
The basement membrane
The enamel organ - dental papilla - dental sac
The basement membrane that seperates the enamel organ and dental papilla
Proliferation

2. What does the cervical loop consist of?
Odontogenesis
Sphere of enamel on root
A bilayer rim that consists only IEE and OEE
Common with permanent maxillary molars

3. What is gemination?
Tooth germ tries to divide
Proliferation - differentiation - morphogenesis
Proliferation
There are none - they are lost with eruption

4. What will the dental sac give rise to?
Outer
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The cementum - PDL - and alveolar bone
May be confused as calculus deposit on root

5. What happens when the reduced enamel epithelium is created?
The primordium of the pulp
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
Trauma - pressure or metabolic disease
Odontogenesis

6. What are the cell layers found in the enamel organ in the bell stage?
Union of 2 adjacent tooth germs
Maturation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

7. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Commonly involves permanent maxillary lateral incisor and 3rd molars
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Epithelial

8. What is the main process involved in the bud stage?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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
Proliferation
The enamel - dentin - and cementum are secreted in successive layers

9. What is concrescence?
Union of root structure of two or more teeth by cementum
Enamel
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The bud stage

10. What are succedaneous teeth?
Hereditary in localized form. endocrine dysfunction is complete
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel organ invaginates into the dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

11. What is cementogenisis?
Apposition of the cementum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop

12. What is the time span for initiation?
Only dentinal tubules with processes
Maturation
Faulty development of enamel from interference involving ameloblasts
6th to 7th weeks

13. What is enamel dysplasia?
Abnormally large teeth
Faulty development of enamel from interference involving ameloblasts
Cementoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

14. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
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
Connective

15. Where is the dental papilla originally derived from?
There are none - they are lost with eruption
The ectomesenchyme - which was influenced by the neural crest cells
Union of root structure of two or more teeth by cementum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

16. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Proliferation
Enamel organ

17. What is macrodontia?
Abnormally large teeth
Extra cusp due to effects on enamel organ
Cementocytes
The apposition of the enamel matrix

18. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The outer enamel epithelium
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
4 types
The ameloblasts

19. What hard tissue is can not have tissue formation after eruption?
Cementoblasts
Enamel pearl - enamel dysplasia - and concresence
Enamel
Dental tissues secreted as matrix in successive layers.

20. What are the etiological factors for supernumerary teeth?
Epithelial rests of Malassez
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Hereditary
Only dentinal tubules with processes

21. What kind of cells reside in the stratum intermediate?
Dental tissues fully mineralize to their mature levels.
Pressure on the area
Absence of single or multiple teeth
Compressed layer of flat to cuboidal cells

22. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Cementoid
Ameloblasts

23. What is the embryological background for dentin - cementum and alveolar bone?
Displacement of ameloblasts to root surface
Maturation
The enamel organ is compressed
Dental papilla

24. What are the etiological factors for dens in dente and gemination?
The basement membrane
Hereditary
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cementoid

25. How many types of cells are found in the enamel organ in the bell stage?
Enamel organ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
4 types
Abnormally small teeth

26. What stage does supernumerary teeth occur?
Enamel secreting cells (ameloblasts)
Initiation
May be confused as calculus deposit on root
Connective

27. What is matrix?
Tooth germ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel

28. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
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
Maturation
The ameloblasts place an acellular dental cuticle on the new enamel surface

29. What wll the inner enamel epithelium differentiate into?
Only dentinal tubules with processes
Tall columnar cells
Induction
Enamel secreting cells (ameloblasts)

30. Active eruption
A mineralized cylinder - the dentinal tubule
Induction - proliferation
Abnormally large teeth
The actual vertical movement of the tooth

31. What are the major components of the tooth germ?
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
The enamel organ - dental papilla - dental sac
It disintegrates as the developing oral mucosa comes to line the oral cavity
Ameloblasts

32. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Epithelial
Traumatic injury or crowding of teeth
During the cap stage
The basement membrane

33. What are the clinical ramifications of enamel dysplasia?
Dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Union of root structure of two or more teeth by cementum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

34. When does the tooth bud become a tooth germ?
The ectoderm
In the cap stage
Epithelial
Alveolar bone

35. When does dens in dente occur?
The enamel organ - dental papilla - dental sac
In the cap stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
During the cap stage

36. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity
When the gingiva recedes and no actual tooth movement takes place
The ameloblasts place an acellular dental cuticle on the new enamel surface

37. What are the incremental lines for cementum and alveolar bone?
Hereditary
It disintegrates as the developing oral mucosa comes to line the oral cavity
Arrest and reversal lines
The enamel organ - dental papilla - dental sac

38. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation
Cuboidal cells
Osteoblasts

39. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The enamel organ is compressed
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Odontoblastic process
The ectomesenchyme - which was influenced by the neural crest cells

40. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Dens in dente - gemination - tubercle - and fusion
Imbrication lines of von Ebner
Sphere of enamel on root
Odontoclasts

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

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42. What is the predominate process in the bell stage?
Differentiation
Dentin and alveolar bone
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cementoblasts

43. How is the reduced enamel epithelium created?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ is compressed
Bud stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

44. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The basement membrane
Preameloblasts
Traumatic injury or crowding of teeth
Morphogenesis

45. What is the predominate process of the cap stage?
The ameloblasts
Alveolar bone
Morphogenesis
Compressed layer of flat to cuboidal cells

46. What is the embryological background for enamel?
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
Arrest and reversal lines
Outer
Enamel organ

47. What is anodontia?
The basement membrane that seperates the enamel organ and dental papilla
Dental tissues fully mineralize to their mature levels.
Absence of single or multiple teeth
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.

48. What are the etiological factors of concrescence?
Cementoblasts
The permanent molars
Ameloblasts
Traumatic injury or crowding of teeth

49. What is dens in dente?
Hereditary in localized form. endocrine dysfunction is complete
9th to 10th weeks
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel organ invaginates into the dental papilla

50. What will the outer cells of the dental lamina differentiate into?
The permanent molars
Dentin secreting cells (odontoblats)
Commonly involves permanent maxillary lateral incisor and 3rd molars
The bud stage

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Dentistry Tooth Development And Eruption

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