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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 happens during the maturation stage?
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
Sphere of enamel on root
The basement membrane that seperates the enamel organ and dental papilla
Dental tissues fully mineralize to their mature levels.

2. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Cementocytes
Dentin and alveolar bone
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

3. Tooth development
Maturation
Enamel organ
The outer cells of the dental papilla and the central cells of the dental papilla
Odontogenesis

4. When does dens in dente occur?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Into odontoblasts
During the cap stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

5. What is the time span for the bud stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Common with permanent maxillary molars
8th week
Induction - proliferation

6. What happens during the bell stage?
The ectomesenchyme - which was influenced by the neural crest cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dental tissues fully mineralize to their mature levels.
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.

7. What will the dental sac give rise to?
There are none - they are lost with eruption
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The cementum - PDL - and alveolar bone
Proliferation

8. When does macro/microdontia occur?
The ectoderm
Bud stage
Pressure on the area
The basement membrane

9. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
The permanent molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Common on permanent molars or cingulum of anterior teeth

10. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
The primordium of the pulp
The dental sac
The dental lamina

11. 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
Displacement of ameloblasts to root surface
Lines of Retzuis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

12. What are the etiological factors of enamel dysplasia?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Induction
Local or systemic or hereditary
The ameloblasts

13. What processes are involved with the apposition stage?
The dental sac
9th to 10th weeks
Connective
Induction - proliferation

14. What else undergoes proliferation in the bud stage besides the dental lamina?
Extra cusp due to effects on enamel organ
Imbrication lines of von Ebner
The ectomesenchyme
Initiation stage

15. What are the development disturbances of the apposition and maturation stages?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental papilla
Pressure on the area
Enamel pearl - enamel dysplasia - and concresence

16. What is enamel dysplasia?
Maturation
The outer enamel epithelium
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Faulty development of enamel from interference involving ameloblasts

17. What are the clinical ramifications of enamel dysplasia?
Differentiation
The stellate reticulum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The outer enamel epithelium

18. What is tubercle?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Extra cusp due to effects on enamel organ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Pressure on the area

19. What are the clinical ramifications of gemination?

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20. What type of tissue is enamel?
Epithelial
Lines of Retzuis
The basement membrane that seperates the enamel organ and dental papilla
Hereditary

21. Where is the enamal organ originally derived from?
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 ectoderm
The basement membrane that seperates the enamel organ and dental papilla
Traumatic injury or crowding of teeth

22. What happens during the cap stage?
Initiation
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.
11th to 12th weeks
4 types

23. What are the etiological factors for anodontia?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Alveolar bone
The outer enamel epithelium
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

24. What will the dental papilla eventually form?
Displacement of ameloblasts to root surface
Traumatic injury or crowding of teeth
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Future dentin and pulp tissue

25. What are the mature cells for cementum?
The enamel organ
The cervical loop
Cementocytes
11th to 12th weeks

26. What are succedaneous teeth?
The ameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoid
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

27. What kind of cells occur in the inner enamel epithelium?
Dental follicle
Odontoblasts
Tall columnar cells
The primordium of the pulp

28. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
Enamel
Dental papilla

29. Active eruption
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The actual vertical movement of the tooth
Common with permanent maxillary molars
Induction - proliferation

30. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The stellate reticulum
The basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

31. What is anodontia?
Absence of single or multiple teeth
The bud stage
Tooth germ tries to divide
The stellate reticulum

32. What is the cementum matrix called?
Initiation stage
The cementum - PDL - and alveolar bone
Cementoid
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

33. How many types of cells are found in the enamel organ in the bell stage?
Maturation
4 types
The ectomesenchyme
There is unequal growth in different parts of the tooth bud

34. What kind of cells occur in the outer enamel epithelium in the bell stage?
Epithelial rests of Malassez
Common on permanent molars or cingulum of anterior teeth
Cuboidal cells
Dens in dente - gemination - tubercle - and fusion

35. What is the time span for the cap stage?
Proliferation
Dental tissues fully mineralize to their mature levels.
9th to 10th weeks
Abnormally large teeth

36. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Epithelial
Tooth germ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dentin secreting cells (odontoblats)

37. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
11th to 12th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ameloblasts
The ectomesenchyme

38. What is concrescence?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental papilla
Cementoid
Union of root structure of two or more teeth by cementum

39. What happens when the reduced enamel epithelium is created?
Differentiation - proliferation - morphogenesis
The ectomesenchyme
During the cap stage
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

40. What is the cap in the cap stage?
The dental lamina
Epithelial rests of Malassez
The enamel organ
Apposition of the cementum

41. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Maturation
Sphere of enamel on root
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

42. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Maturation
Into odontoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Preameloblasts

43. What do the odontoblasts do?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Traumatic injury or crowding of teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Proliferation

44. Which layer in the bell stage has star shaped cells?
Enamel pearl - enamel dysplasia - and concresence
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The stellate reticulum
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

45. What is microdontia?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
During the cap stage
Abnormally small teeth
Hereditary

46. What is the process involved in the maturation stage?
The enamel organ - dental papilla - dental sac
Maturation
The ameloblasts place an acellular dental cuticle on the new enamel surface
Ameloblasts

47. What is macrodontia?
Outer
The dental lamina
Abnormally large teeth
Differentiation

48. What are the clinical ramifications of dens in dente?
Dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Traumatic injury or crowding of teeth

49. What are supernumerary teeth?
The dental sac
Development of one or more extra teeth
Induction
Only dentinal tubules with processes

50. 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
Faulty development of enamel from interference involving ameloblasts
The primordium of the pulp
The cementum - PDL - and alveolar bone