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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. Where is the dental sac originally derived from?
Bud stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Preameloblasts
The ectomesenchyme

2. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Hereditary
Cementoblasts
The tooth germ
In the cap stage

3. What are succedaneous teeth?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontogenesis
Faulty development of enamel from interference involving ameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

4. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Initiation
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 Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

5. What is matrix?
Differentiation - proliferation - morphogenesis
Enamel organ invaginates into the dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Inner

6. What is tubercle?
Extra cusp due to effects on enamel organ
In the cap stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

7. What are the etiological factors for enamel pearl?
4 types
Displacement of ameloblasts to root surface
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

8. What are the etiological factors for anodontia?
Preameloblasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
There is unequal growth in different parts of the tooth bud
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

9. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
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.
Traumatic injury or crowding of teeth
Cementocytes

10. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Induction
The ameloblasts
Local or systemic or hereditary
When the gingiva recedes and no actual tooth movement takes place

11. Which layer in the bell stage has star shaped cells?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The stellate reticulum
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Tooth germ tries to divide

12. What is the embryological background for enamel?
Abnormally large teeth
Tall columnar cells
Enamel organ
Enamel organ invaginates into the dental papilla

13. What is gemination?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Connective
Enamel pearl - enamel dysplasia - and concresence
Tooth germ tries to divide

14. What is the outer portion of the ectoderm in the initiation stage?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Oral epithelium
Cuboidal cells
Abnormally large teeth

15. What is enamel dysplasia?
Absence of single or multiple teeth
Dental papilla
As a result of the apposition of cementum over dentin
Faulty development of enamel from interference involving ameloblasts

16. What are the etiological factors of concrescence?
Maturation
Traumatic injury or crowding of teeth
The tooth germ
4 types

17. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
The cementum - PDL - and alveolar bone
Enamel
Compressed layer of flat to cuboidal cells

18. What are the clinical ramifications of anodontia?
Local or systemic or hereditary
The basement membrane that seperates the enamel organ and dental papilla
The actual vertical movement of the tooth
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

19. What are the mature cells for alveolar bone?
Osteoblasts
Odontoblasts
Odontoclasts
Osteocytes

20. What is cementogenisis?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Extra cusp due to effects on enamel organ
Apposition of the cementum
Hereditary

21. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
The basement membrane
The permanent molars
The actual vertical movement of the tooth

22. What happens to the thickened non tooth producing portions of the dental lamina eventually?
11th to 12th weeks
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cuboidal cells
Initiation

23. What is amelogenisis?
The actual vertical movement of the tooth
The apposition of the enamel matrix
6th to 7th weeks
The permanent molars

24. When does macro/microdontia occur?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dentin and alveolar bone
Induction
Bud stage

25. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Pressure on the area
The ectomesenchyme
May be confused as calculus deposit on root

26. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Initiation stage
Odontoblastic process
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 ameloblasts place an acellular dental cuticle on the new enamel surface

27. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Extra cusp due to effects on enamel organ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

28. What is the predominate process in the bell stage?
Displacement of ameloblasts to root surface
Differentiation
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

29. In the cap stage the tooth bud does not grow - what happens?
Imbrication lines of von Ebner
Abnormally large teeth
There is unequal growth in different parts of the tooth bud
Connective

30. What is the embryological background for dentin - cementum and alveolar bone?
Absence of single or multiple teeth
Dental papilla
The cementum - PDL - and alveolar bone
The basement membrane that seperates the enamel organ and dental papilla

31. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Initiation
As a result of the apposition of cementum over dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

32. When does the tooth bud become a tooth germ?
In the cap stage
A mineralized cylinder - the dentinal tubule
Arrest and reversal lines
Cementoblasts

33. What are the clinical ramifications?
Hereditary
Common on permanent molars or cingulum of anterior teeth
Imbrication lines of von Ebner
Dental follicle

34. When does the process of root development take place?
Maturation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Epithelial

35. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
Odontoblastic process
The ameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

36. What is the time span for the bud stage?
The actual vertical movement of the tooth
8th week
Imbrication lines of von Ebner
Preameloblasts

37. Where is the enamal organ originally derived from?
The basement membrane
The ectoderm
As a result of the apposition of cementum over dentin
The ectomesenchyme

38. What is dens in dente?
Preameloblasts
There are none - they are lost with eruption
Union of 2 adjacent tooth germs
Enamel organ invaginates into the dental papilla

39. The stratum intermediate is located inner or outer?
Inner
Arrest and reversal lines
The enamel organ
Initiation

40. What are the etiological factors for fusion?
Pressure on the area
The enamel organ
Odontogenesis
Imbrication lines of von Ebner

41. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Absence of single or multiple teeth
Local or systemic or hereditary
Morphogenesis
The outer cells of the dental papilla and the central cells of the dental papilla

42. Active eruption
The actual vertical movement of the tooth
Epithelial rests of Malassez
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Common with permanent maxillary molars

43. What hard tissue is can not have tissue formation after eruption?
Sphere of enamel on root
Maturation
Enamel
Hereditary

44. What is the site for the future dentioenamel junction?
Odontoclasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The basement membrane that seperates the enamel organ and dental papilla
Dental tissues fully mineralize to their mature levels.

45. What are the clinical ramifications of supernumerary teeth?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
11th to 12th weeks
The apposition of the enamel matrix
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

46. What are the mature cells for dentin?
A bilayer rim that consists only IEE and OEE
Only dentinal tubules with processes
Enamel organ
Induction - proliferation

47. What kind of cells occur in the inner enamel epithelium?
Maturation
Tall columnar cells
The outer enamel epithelium
The primordium of the pulp

48. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Enamel organ
The bud stage
11th to 12th weeks
Morphogenesis

49. What kind of cells reside in the stratum intermediate?
Tooth germ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Faulty development of enamel from interference involving ameloblasts
Compressed layer of flat to cuboidal cells

50. What hard tissue has vascularity?
Alveolar bone
Dental papilla
11th to 12th weeks
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