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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is the function of the Hertwig's epithelial root sheath?
Odontoclasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Development of one or more extra teeth

2. What kind of cells occur in the outer enamel epithelium in the bell stage?
Bud stage
Cuboidal cells
The outer enamel epithelium
When the gingiva recedes and no actual tooth movement takes place

3. What are the mature cells for enamel?
There are none - they are lost with eruption
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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

4. When does macro/microdontia occur?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ectomesenchyme
Compressed layer of flat to cuboidal cells
Bud stage

5. What is the time span for initiation?
Trauma - pressure or metabolic disease
Induction - proliferation
8th week
6th to 7th weeks

6. What is dens in dente?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Enamel organ invaginates into the dental papilla
Proliferation

7. What is the process involved in the maturation stage?
Maturation
Dens in dente - gemination - tubercle - and fusion
The dental lamina
Tall columnar cells

8. What are the etiological factors for dens in dente and gemination?
Hereditary
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
As a result of the apposition of cementum over dentin

9. What are the mature cells for dentin?
Imbrication lines of von Ebner
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Only dentinal tubules with processes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

10. 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
Into odontoblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

11. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ

12. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Abnormally large teeth
Into odontoblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity

13. What is gemination?
The ectoderm
Dentin and alveolar bone
Epithelial rests of Malassez
Tooth germ tries to divide

14. What is amelogenisis?
Dental papilla
The apposition of the enamel matrix
The ectomesenchyme
Cementoblasts

15. What are the formative cells for enamel?
Enamel organ invaginates into the dental papilla
6th to 7th weeks
Ameloblasts
Abnormally large teeth

16. When does the tooth bud become a tooth germ?
In the cap stage
Odontogenesis
The ectoderm
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

17. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
During the cap stage
The bud stage
The ameloblasts

18. What are the clinical ramifications of fusion?
The dental lamina
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The apposition of the enamel matrix
Absence of single or multiple teeth

19. What is the predominate process of the cap stage?
Proliferation
Morphogenesis
Oral epithelium
Only dentinal tubules with processes

20. What are the major components of the tooth germ?
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
The bud stage
Union of 2 adjacent tooth germs
The enamel organ - dental papilla - dental sac

21. What are the etiological factors for fusion?
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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Differentiation - proliferation - morphogenesis
Pressure on the area

22. How many types of cells are found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
4 types
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Preameloblasts

23. What stage does the dental tissues subsequently fully mineralize
There is unequal growth in different parts of the tooth bud
Maturation
Dentin secreting cells (odontoblats)
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

24. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
4 types
During the cap stage
6th to 7th weeks

25. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Into odontoblasts
Dental tissues fully mineralize to their mature levels.
Pressure on the area

26. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Inner
There is unequal growth in different parts of the tooth bud
Proliferation

27. What happens during the maturation stage?
Induction - proliferation
The actual vertical movement of the tooth
Enamel organ invaginates into the dental papilla
Dental tissues fully mineralize to their mature levels.

28. Passive eruption
Union of root structure of two or more teeth by cementum
Dental tissues secreted as matrix in successive layers.
When the gingiva recedes and no actual tooth movement takes place
The dental sac

29. What is macrodontia?
Union of 2 adjacent tooth germs
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementocytes
Abnormally large teeth

30. What processes are involved in the bell stage?
Preameloblasts
Differentiation - proliferation - morphogenesis
11th to 12th weeks
Apposition of the cementum

31. The preameloblasts induce dental papilla cells to differentiate into what?
The dental sac
Into odontoblasts
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
The basement membrane

32. What are the etiological factors for anodontia?
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
The cementum - PDL - and alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

33. What are the mature cells for cementum?
8th week
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementocytes
Tall columnar cells

34. What is anodontia?
Cementoblasts
Union of 2 adjacent tooth germs
Absence of single or multiple teeth
Future dentin and pulp tissue

35. What are entrapped cementoblasts called?
Cementocytes
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Into odontoblasts
Dentin and alveolar bone

36. What is the cap in the cap stage?
Epithelial rests of Malassez
There is unequal growth in different parts of the tooth bud
The enamel organ
Bud stage

37. What kind of cells reside in the stratum intermediate?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Traumatic injury or crowding of teeth
Compressed layer of flat to cuboidal cells
As a result of the apposition of cementum over dentin

38. What are the clinical ramifications of concrescence?
The ectomesenchyme - which was influenced by the neural crest cells
Common with permanent maxillary molars
Compressed layer of flat to cuboidal cells
Cementocytes

39. What happens during the appositional stage?
The enamel organ is compressed
Cementocytes
Hereditary in localized form. endocrine dysfunction is complete
The enamel - dentin - and cementum are secreted in successive layers

40. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental tissues secreted as matrix in successive layers.
Odontoclasts
Connective

41. What is the cementum matrix called?
Dental follicle
The ectomesenchyme
Cementoid
Bud stage

42. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
The basement membrane that seperates the enamel organ and 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
Outer

43. 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
The enamel organ
Odontogenesis
Traumatic injury or crowding of teeth

44. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Compressed layer of flat to cuboidal cells
The ectomesenchyme

45. Which teeth are nonsuccedaneous?
The apposition of the enamel matrix
The permanent molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoblastic process

46. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Common with permanent maxillary molars
There is unequal growth in different parts of the tooth bud
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

47. What are the clinical ramifications of supernumerary 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
Enamel pearl - enamel dysplasia - and concresence
The cementum - PDL - and alveolar bone
Initiation

48. What type of tissue is dentin - cementum - and alveolar bone?
Connective
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
As a result of the apposition of cementum over dentin
The primordium of the pulp

49. What is concrescence?
Induction - proliferation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Union of root structure of two or more teeth by cementum
Only dentinal tubules with processes

50. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The ameloblasts
11th to 12th weeks
Initiation stage
Epithelial rests of Malassez