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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 function of the Hertwig's epithelial root sheath?
6th to 7th weeks
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Arrest and reversal lines

2. What kind of cells reside in the stratum intermediate?
Displacement of ameloblasts to root surface
Preameloblasts
There are none - they are lost with eruption
Compressed layer of flat to cuboidal cells

3. What happens during initiation?
Induction - proliferation
Enamel pearl - enamel dysplasia - and concresence
Dental follicle
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

4. When does the tooth bud become a tooth germ?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
In the cap stage
Extra cusp due to effects on enamel organ
Odontoblasts

5. What is the predominate process in the bell stage?
Cementocytes
Differentiation
The dental lamina
Traumatic injury or crowding of teeth

6. What are entrapped cementoblasts called?
Inner
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Compressed layer of flat to cuboidal cells
Cementocytes

7. What are the clinical ramifications?
May be confused as calculus deposit on root
Preameloblasts
Common on permanent molars or cingulum of anterior teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface

8. What are the etiological factors of tubercle?
Cementoblasts
Trauma - pressure or metabolic disease
The permanent molars
Osteocytes

9. What are the cell layers found in the enamel organ in the bell stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells
The primordium of the pulp
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

10. What is amelogenisis?
Union of 2 adjacent tooth germs
The ectomesenchyme - which was influenced by the neural crest cells
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The apposition of the enamel matrix

11. What are succedaneous teeth?
6th to 7th weeks
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
There is unequal growth in different parts of the tooth bud

12. What is the structure responsible for root development?
The cervical loop
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
Lines of Retzuis
The ameloblasts

13. What are the clinical ramifications of enamel dysplasia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

14. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The outer enamel epithelium
The ectomesenchyme
Dentin secreting cells (odontoblats)

15. What happens during the maturation stage?
Tooth germ tries to divide
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dental tissues fully mineralize to their mature levels.
Commonly involves permanent maxillary lateral incisor and 3rd molars

16. What are the odontoblastic processes is contained in what?
Enamel pearl - enamel dysplasia - and concresence
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
A mineralized cylinder - the dentinal tubule
Development of one or more extra teeth

17. What stage does anodontia occur?
Induction
When the gingiva recedes and no actual tooth movement takes place
Osteoblasts
Initiation stage

18. What will the dental papilla eventually form?
Future dentin and pulp tissue
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The cervical loop

19. What are the development disturbances of the apposition and maturation stages?
Tooth germ tries to divide
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Absence of single or multiple teeth
Enamel pearl - enamel dysplasia - and concresence

20. What are the incremental lines for enamel?
Arrest and reversal lines
Lines of Retzuis
Enamel organ
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

21. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The ectomesenchyme
There is unequal growth in different parts of the tooth bud
The tooth germ
It disintegrates as the developing oral mucosa comes to line the oral cavity

22. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Tall columnar cells
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The outer cells of the dental papilla and the central cells of the dental papilla
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

23. What are the etiological factors for anodontia?
Alveolar bone
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Arrest and reversal lines
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

24. What is the time span for initiation?
Dental papilla
Enamel organ
6th to 7th weeks
Proliferation

25. The preameloblasts induce dental papilla cells to differentiate into what?
Displacement of ameloblasts to root surface
Tooth germ
Into odontoblasts
Outer

26. What is fusion?
Union of 2 adjacent tooth germs
Dental papilla
Into odontoblasts
Trauma - pressure or metabolic disease

27. What are the clinical ramifications of micro/macrodontia?
Extra cusp due to effects on enamel organ
Dens in dente - gemination - tubercle - and fusion
Absence of single or multiple teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars

28. Where is the dental sac originally derived from?
Proliferation - differentiation - morphogenesis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ectomesenchyme

29. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Abnormally small teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontoblastic process
Dentin and alveolar bone

30. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Absence of single or multiple teeth
Dental follicle
The ameloblasts place an acellular dental cuticle on the new enamel surface
Outer

31. What are the clinical ramifications of enamel pearl?
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 bud stage
May be confused as calculus deposit on root
The stellate reticulum

32. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Maturation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ameloblasts place an acellular dental cuticle on the new enamel surface

33. What is another name for the dental sac?
Dental follicle
Sphere of enamel on root
Hereditary
Extra cusp due to effects on enamel organ

34. What is the site for the future dentioenamel junction?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Maturation
The basement membrane that seperates the enamel organ and dental papilla
Cementocytes

35. What will the inner cells of the dental lamina differentiates into?
Tooth germ tries to divide
The primordium of the pulp
The cementum - PDL - and alveolar bone
The basement membrane

36. What are the clinical ramifications of fusion?
Common on permanent molars or cingulum of anterior teeth
Epithelial rests of Malassez
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The bud stage

37. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Development of one or more extra teeth
Induction
When the gingiva recedes and no actual tooth movement takes place

38. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
During the cap stage
When the gingiva recedes and no actual tooth movement takes place
Into odontoblasts

39. What are the etiological factors of concrescence?
Union of root structure of two or more teeth by cementum
Odontoclasts
Traumatic injury or crowding of teeth
During the cap stage

40. What kind of cells occur in the inner enamel epithelium?
The enamel organ is compressed
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Tall columnar cells
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

41. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Lines of Retzuis
Alveolar bone
The stellate reticulum

42. What are the etiological factors for fusion?
Pressure on the area
Arrest and reversal lines
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
4 types

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

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44. What is microdontia?
Alveolar bone
Abnormally small teeth
Tooth germ tries to divide
Maturation

45. What is the time span for the bell stage?
11th to 12th weeks
The ameloblasts
Apposition of the cementum
Dens in dente - gemination - tubercle - and fusion

46. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Hereditary
Tooth germ
Dens in dente - gemination - tubercle - and fusion
Epithelial rests of Malassez

47. What are the clinical ramifications of supernumerary teeth?
Osteoblasts
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
Enamel

48. What are the formative cells for dentin?
Odontoblasts
Arrest and reversal lines
Cementoblasts
Epithelial rests of Malassez

49. What is the time span for the cap stage?
Connective
9th to 10th weeks
The ectomesenchyme - which was influenced by the neural crest cells
Maturation

50. What is the outer portion of the ectoderm in the initiation stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
During the cap stage
Oral epithelium
Alveolar bone