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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 are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Odontoblasts
Maturation
The stellate reticulum

2. What else undergoes proliferation in the bud stage besides the dental lamina?
Common with permanent maxillary molars
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ectomesenchyme
11th to 12th weeks

3. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
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
Cementocytes
Odontogenesis
Dental papilla

4. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Maturation
Initiation stage
Lines of Retzuis

5. What is the function of the Hertwig's epithelial root sheath?
9th to 10th weeks
Common on permanent molars or cingulum of anterior teeth
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.
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

6. What processes are involved with the apposition stage?
Into odontoblasts
Induction - proliferation
Dentin and alveolar bone
Faulty development of enamel from interference involving ameloblasts

7. What is the cap in the cap stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The stellate reticulum
The enamel organ
Trauma - pressure or metabolic disease

8. What type of tissue is enamel?
Dental follicle
The enamel organ - dental papilla - dental sac
Epithelial
Enamel organ

9. The preameloblasts induce dental papilla cells to differentiate into what?
The dental sac
Tooth germ tries to divide
Into odontoblasts
Arrest and reversal lines

10. What kind of cells reside in the stratum intermediate?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Compressed layer of flat to cuboidal cells

11. What are the clinical ramifications of micro/macrodontia?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Sphere of enamel on root
Hereditary
Commonly involves permanent maxillary lateral incisor and 3rd molars

12. What will the outer cells of the dental lamina differentiate into?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dentin secreting cells (odontoblats)
The basement membrane
Tall columnar cells

13. What are the etiological factors for dens in dente and gemination?
A mineralized cylinder - the dentinal tubule
Hereditary
The ectomesenchyme
Outer

14. What are the etiological factors for fusion?
Pressure on the area
Local or systemic or hereditary
Imbrication lines of von Ebner
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

15. What stage does anodontia occur?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementoblasts
Initiation stage
Arrest and reversal lines

16. What happens during the cap stage?
The ameloblasts
The basement membrane
Inner
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.

17. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Tall columnar cells
Cementoblasts
Odontoblastic process
A bilayer rim that consists only IEE and OEE

18. What are the odontoblastic processes is contained in what?
There is unequal growth in different parts of the tooth bud
Odontoblastic process
The apposition of the enamel matrix
A mineralized cylinder - the dentinal tubule

19. What is gemination?
Tooth germ tries to divide
Dental papilla
Extra cusp due to effects on enamel organ
Epithelial rests of Malassez

20. When does dens in dente occur?
During the cap stage
Cementocytes
The ectomesenchyme - which was influenced by the neural crest cells
The ectomesenchyme

21. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel
Cementoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface

22. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
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
Odontogenesis
The dental sac
Traumatic injury or crowding of teeth

23. What are the mature cells for alveolar bone?
The ectomesenchyme
Faulty development of enamel from interference involving ameloblasts
Osteocytes
Extra cusp due to effects on enamel organ

24. What is anodontia?
Absence of single or multiple teeth
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.
Tall columnar cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

25. What is microdontia?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Abnormally small teeth
There is unequal growth in different parts of the tooth bud

26. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Hereditary in localized form. endocrine dysfunction is complete
The outer cells of the dental papilla and the central cells of the dental papilla
Local or systemic or hereditary
The apposition of the enamel matrix

27. What is the structure responsible for root development?
The cervical loop
The enamel - dentin - and cementum are secreted in successive layers
Preameloblasts
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

28. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
May be confused as calculus deposit on root

29. What are the incremental lines for dentin?
Imbrication lines of von Ebner
There is unequal growth in different parts of the tooth bud
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

30. What is the predominate process of the cap stage?
Trauma - pressure or metabolic disease
Morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The enamel organ is compressed

31. What is amelogenisis?
Tooth germ
The apposition of the enamel matrix
The enamel - dentin - and cementum are secreted in successive layers
The tooth germ

32. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Tooth germ
Dental tissues secreted as matrix in successive layers.
Future dentin and pulp tissue

33. What kind of cells occur in the inner enamel epithelium?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Tall columnar cells

34. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Tall columnar cells
Imbrication lines of von Ebner
The bud stage

35. What are the formative cells for alveolar bone?
Dental papilla
Osteoblasts
Preameloblasts
May be confused as calculus deposit on root

36. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Odontogenesis
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontoblastic process

37. What kind of cells occur in the outer enamel epithelium in the bell stage?
There are none - they are lost with eruption
Dental papilla
Cuboidal cells
Cementoblasts

38. What is enamel dysplasia?
Osteocytes
Faulty development of enamel from interference involving ameloblasts
The basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

39. What is tubercle?
The enamel organ is compressed
Extra cusp due to effects on enamel organ
Osteoblasts
A bilayer rim that consists only IEE and OEE

40. What happens during the apposition stage?
The basement membrane
Dental tissues secreted as matrix in successive layers.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ameloblasts place an acellular dental cuticle on the new enamel surface

41. Where does the primordium of the permanent dentition develop?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Osteoblasts
Initiation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

42. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
The tooth germ
Absence of single or multiple teeth
The actual vertical movement of the tooth

43. What are the etiological factors of concrescence?
Enamel secreting cells (ameloblasts)
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Traumatic injury or crowding of teeth
Cementoblasts

44. What are the processes involved in the cap stage?
4 types
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental follicle
Proliferation - differentiation - morphogenesis

45. What are the clinical ramifications?
The bud stage
Common on permanent molars or cingulum of anterior teeth
Enamel organ invaginates into the dental papilla
Sphere of enamel on root

46. What are the mature cells for enamel?
Proliferation - differentiation - morphogenesis
There are none - they are lost with eruption
Enamel pearl - enamel dysplasia - and concresence
Dental papilla

47. Which teeth are nonsuccedaneous?
6th to 7th weeks
The permanent molars
The ectomesenchyme - which was influenced by the neural crest cells
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.

48. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
There is unequal growth in different parts of the tooth bud
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

49. What is cementogenisis?
Maturation
Apposition of the cementum
Cuboidal cells
There are none - they are lost with eruption

50. What is the main process involved in initiation?
Tooth germ tries to divide
Traumatic injury or crowding of teeth
Induction
The ameloblasts place an acellular dental cuticle on the new enamel surface