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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. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Development of one or more extra teeth
Hereditary

2. What is amelogenisis?
Abnormally large teeth
Dental follicle
Proliferation - differentiation - morphogenesis
The apposition of the enamel matrix

3. When does macro/microdontia occur?
4 types
Hereditary in localized form. endocrine dysfunction is complete
Bud stage
Development of one or more extra teeth

4. What is another name for the dental sac?
Osteoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental follicle
11th to 12th weeks

5. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
6th to 7th weeks
Odontoclasts
Outer
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

6. What happens to the thickened non tooth producing portions of the dental lamina eventually?
4 types
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel organ
Lines of Retzuis

7. What is the primordium of the tooth?
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 tooth germ
Proliferation - differentiation - morphogenesis
The actual vertical movement of the tooth

8. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Abnormally small teeth
Tooth germ
Enamel pearl - enamel dysplasia - and concresence
The basement membrane

9. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Osteocytes
The stellate reticulum
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

10. What will the inner cells of the dental lamina differentiates into?
Bud stage
Cementoid
The enamel organ - dental papilla - dental sac
The primordium of the pulp

11. What are the clinical ramifications of gemination?

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12. What is the predominate process in the bell stage?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Differentiation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Osteoblasts

13. What are entrapped cementoblasts called?
Traumatic injury or crowding of teeth
Cementocytes
Future dentin and pulp tissue
Odontoblasts

14. What are succedaneous teeth?
Enamel organ invaginates into the dental papilla
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

15. What are the mature cells for alveolar bone?
Osteocytes
The ectomesenchyme
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Epithelial

16. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The apposition of the enamel matrix
Arrest and reversal lines
The cervical loop

17. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The actual vertical movement of the tooth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Induction - proliferation
Tooth germ

18. What are the development disturbances of the apposition and maturation stages?
Abnormally large teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel pearl - enamel dysplasia - and concresence
8th week

19. What is the time span for the cap stage?
9th to 10th weeks
Induction
The actual vertical movement of the tooth
Tooth germ

20. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
A bilayer rim that consists only IEE and OEE
May be confused as calculus deposit on root

21. What are the cell layers found in the enamel organ in the bell stage?
Absence of single or multiple teeth
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

22. What are the mature cells for cementum?
Cementocytes
Only dentinal tubules with processes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Initiation

23. What hard tissue has vascularity?
Dental tissues fully mineralize to their mature levels.
Traumatic injury or crowding of teeth
Alveolar bone
Trauma - pressure or metabolic disease

24. What happens during the cap stage?
Cementocytes
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.
Dens in dente - gemination - tubercle - and fusion
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

25. Where is the enamal organ originally derived from?
The ectoderm
Morphogenesis
Dentin and alveolar bone
Union of 2 adjacent tooth germs

26. What is microdontia?
Abnormally small teeth
Cuboidal cells
Induction - proliferation
Preameloblasts

27. What are the incremental lines for enamel?
Lines of Retzuis
Enamel organ invaginates into the dental papilla
Odontogenesis
The outer enamel epithelium

28. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The ameloblasts place an acellular dental cuticle on the new enamel surface
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
The enamel organ is compressed

29. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Development of one or more extra teeth
Odontoblastic process
Epithelial rests of Malassez
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

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

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31. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Connective
Enamel secreting cells (ameloblasts)

32. What are the clinical ramifications of micro/macrodontia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

33. What are the clinical ramifications of dens in dente?
Dental tissues fully mineralize to their mature levels.
The enamel organ - dental papilla - dental sac
The stellate reticulum
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

34. Which teeth are nonsuccedaneous?
6th to 7th weeks
Morphogenesis
The apposition of the enamel matrix
The permanent molars

35. What is the cap in the cap stage?
The dental sac
Traumatic injury or crowding of teeth
Dental papilla
The enamel organ

36. What will the outer cells of the dental lamina differentiate into?
Induction
Dentin secreting cells (odontoblats)
Apposition of the cementum
Extra cusp due to effects on enamel organ

37. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
6th to 7th weeks
The dental lamina
Displacement of ameloblasts to root surface
The bud stage

38. What are the mature cells for dentin?
As a result of the apposition of cementum over dentin
Only dentinal tubules with processes
There is unequal growth in different parts of the tooth bud
The ectoderm

39. The oral epithelium is induced by the ectomesenchyme to produce what?
Union of root structure of two or more teeth by cementum
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Induction - proliferation
The dental lamina

40. What stage does supernumerary teeth occur?
The basement membrane
Odontoclasts
Initiation
Epithelial rests of Malassez

41. What do the odontoblasts do?
In the cap stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Initiation
Dens in dente - gemination - tubercle - and fusion

42. What are the etiological factors of concrescence?
Sphere of enamel on root
The primordium of the pulp
Traumatic injury or crowding of teeth
Dental papilla

43. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Odontoblastic process
Cementocytes
Osteoblasts

44. What is anodontia?
A bilayer rim that consists only IEE and OEE
Imbrication lines of von Ebner
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Absence of single or multiple teeth

45. What are the clinical ramifications of anodontia?
The ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Preameloblasts

46. What will the dental sac give rise to?
Union of 2 adjacent tooth germs
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 cementum - PDL - and alveolar bone
Dental tissues fully mineralize to their mature levels.

47. What happens during initiation?
Differentiation - proliferation - morphogenesis
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
Union of root structure of two or more teeth by cementum
Odontoclasts

48. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
The ectomesenchyme
Cuboidal cells
Local or systemic or hereditary

49. When does the process of root development take place?
Enamel
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
6th to 7th weeks
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

50. What is concrescence?
Common on permanent molars or cingulum of anterior teeth
Union of root structure of two or more teeth by cementum
Extra cusp due to effects on enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface