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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. The preameloblasts induce dental papilla cells to differentiate into what?
Absence of single or multiple teeth
The ectomesenchyme
Development of one or more extra teeth
Into odontoblasts

2. What are the clinical ramifications of enamel dysplasia?
Enamel
Cuboidal cells
Commonly involves permanent maxillary lateral incisor and 3rd molars
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

3. What else undergoes proliferation in the bud stage besides the dental lamina?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectomesenchyme
Union of 2 adjacent tooth germs
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 is the time span for the bud stage?
Proliferation - differentiation - morphogenesis
Maturation
8th week
Hereditary

5. What are the etiological factors of concrescence?
Epithelial
Traumatic injury or crowding of teeth
Dentin secreting cells (odontoblats)
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

6. What hard tissue is can not have tissue formation after eruption?
Connective
Enamel
Hereditary
Union of 2 adjacent tooth germs

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

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8. What hard tissue has vascularity?
Alveolar bone
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
When the gingiva recedes and no actual tooth movement takes place

9. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
Proliferation - differentiation - morphogenesis
Dental tissues secreted as matrix in successive layers.
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

10. What do the odontoblasts do?
There are none - they are lost with eruption
Epithelial rests of Malassez
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Pressure on the area

11. What is the structure responsible for root development?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The cervical loop
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

12. What are the etiological factors for enamel pearl?
Cementoblasts
Union of 2 adjacent tooth germs
Displacement of ameloblasts to root surface
There is unequal growth in different parts of the tooth bud

13. What is tubercle?
Connective
The apposition of the enamel matrix
Dental tissues secreted as matrix in successive layers.
Extra cusp due to effects on enamel organ

14. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Enamel
Tooth germ tries to divide
Connective

15. What type of tissue is dentin - cementum - and alveolar bone?
Only dentinal tubules with processes
9th to 10th weeks
Tooth germ tries to divide
Connective

16. What is the predominate process of the cap stage?
Morphogenesis
Union of root structure of two or more teeth by cementum
Connective
The outer enamel epithelium

17. What hard tissue is innervated by nerves?
Induction - proliferation
Enamel
Dentin and alveolar bone
There are none - they are lost with eruption

18. What is the function of the Hertwig's epithelial root sheath?
In the cap stage
Outer
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Faulty development of enamel from interference involving ameloblasts

19. When does macro/microdontia occur?
Bud stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The permanent molars
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

20. The stellate reticulum is located inner or outer?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The outer enamel epithelium
Outer
Maturation

21. What are the etiological factors for micro/macrodontia?
Enamel organ
Odontogenesis
Hereditary in localized form. endocrine dysfunction is complete
Cuboidal cells

22. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Epithelial rests of Malassez
When the gingiva recedes and no actual tooth movement takes place
Differentiation - proliferation - morphogenesis

23. When does the process of root development take place?
Local or systemic or hereditary
The ameloblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The stellate reticulum

24. What are the formative cells for cementum?
Cementoblasts
Development of one or more extra teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

25. What are succedaneous teeth?
Maturation
9th to 10th weeks
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
4 types

26. What are the clinical ramifications?
Dental tissues secreted as matrix in successive layers.
Common on permanent molars or cingulum of anterior teeth
The outer cells of the dental papilla and the central cells of the dental papilla
The ectoderm

27. What is the embryological background for enamel?
Maturation
6th to 7th weeks
The actual vertical movement of the tooth
Enamel organ

28. What are the mature cells for cementum?
The basement membrane
Epithelial rests of Malassez
Cementocytes
8th week

29. Where is the dental papilla originally derived from?
Initiation stage
The ectomesenchyme - which was influenced by the neural crest cells
Alveolar bone
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

30. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Into odontoblasts
The enamel - dentin - and cementum are secreted in successive layers
Imbrication lines of von Ebner

31. What is the primordium of the tooth?
The tooth germ
The enamel - dentin - and cementum are secreted in successive layers
Differentiation
The actual vertical movement of the tooth

32. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Trauma - pressure or metabolic disease
Dentin and alveolar bone
Tooth germ
Displacement of ameloblasts to root surface

33. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Tall columnar cells
Outer

34. When does the tooth bud become a tooth germ?
Epithelial rests of Malassez
In the cap stage
The dental sac
4 types

35. What are entrapped cementoblasts called?
Union of root structure of two or more teeth by cementum
Cementocytes
The cervical loop
The enamel - dentin - and cementum are secreted in successive layers

36. What stage does the dental tissues subsequently fully mineralize
Maturation
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla
A bilayer rim that consists only IEE and OEE

37. What will the inner cells of the dental lamina differentiates into?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Induction - proliferation
The primordium of the pulp
Absence of single or multiple teeth

38. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
11th to 12th weeks
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The basement membrane

39. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Alveolar bone
The enamel organ - dental papilla - dental sac

40. What are the mature cells for enamel?
Dentin secreting cells (odontoblats)
Development of one or more extra teeth
There are none - they are lost with eruption
Absence of single or multiple teeth

41. What type of tissue is enamel?
Into odontoblasts
Epithelial
During the cap stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

42. What are the clinical ramifications of concrescence?
The ectoderm
Epithelial
Common with permanent maxillary molars
Outer

43. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Oral epithelium
It disintegrates as the developing oral mucosa comes to line the oral cavity
Differentiation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

44. How many types of cells are found in the enamel organ in the bell stage?
4 types
Local or systemic or hereditary
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Epithelial rests of Malassez

45. What are the etiological factors for fusion?
Pressure on the area
Alveolar bone
The cervical loop
A mineralized cylinder - the dentinal tubule

46. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

47. What is the predominate process in the bell stage?
Oral epithelium
Differentiation
Preameloblasts
There are none - they are lost with eruption

48. Tooth development
Tooth germ tries to divide
9th to 10th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Odontogenesis

49. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The enamel organ is compressed
Dental papilla
Dental tissues fully mineralize to their mature levels.
Arrest and reversal lines

50. Do odontoblasts start their secretion of matrix before the ameloblasts?
The basement membrane
The ectomesenchyme
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Traumatic injury or crowding of teeth