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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 etiological factors for fusion?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Pressure on the area
The apposition of the enamel matrix
Abnormally large teeth

2. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
The permanent molars
Induction - proliferation
Tooth germ tries to divide

3. What are the odontoblastic processes is contained in what?
The dental lamina
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Trauma - pressure or metabolic disease
A mineralized cylinder - the dentinal tubule

4. What are the processes involved in the cap stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Proliferation - differentiation - morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The cervical loop

5. What is fusion?
Abnormally small teeth
The enamel organ is compressed
Union of 2 adjacent tooth germs
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

6. What are supernumerary teeth?
Arrest and reversal lines
Enamel secreting cells (ameloblasts)
Development of one or more extra teeth
The tooth germ

7. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Pressure on the area
Cementoblasts
Cementocytes

8. What happens during the maturation stage?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
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.
Union of root structure of two or more teeth by cementum

9. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
The primordium of the pulp
Bud stage
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

10. How many types of cells are found in the enamel organ in the bell stage?
Odontoclasts
Hereditary
Initiation
4 types

11. 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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Tooth germ tries to divide
Initiation stage

12. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Maturation

13. When does the tooth bud become a tooth germ?
Only dentinal tubules with processes
Cuboidal cells
In the cap stage
Imbrication lines of von Ebner

14. What is the primordium of the tooth?
The tooth germ
Dentin secreting cells (odontoblats)
Tooth germ tries to divide
Oral epithelium

15. What are succedaneous teeth?
During the cap stage
Ameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The basement membrane that seperates the enamel organ and dental papilla

16. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel - dentin - and cementum are secreted in successive layers
The basement membrane that seperates the enamel organ and dental papilla
Morphogenesis

17. What happens during the cap stage?
Dental follicle
Maturation
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.
Faulty development of enamel from interference involving ameloblasts

18. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Cementocytes
The bud stage
Local or systemic or hereditary

19. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Tooth germ
During the cap stage
Faulty development of enamel from interference involving ameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

20. What is another name for the dental sac?
Lines of Retzuis
Dental follicle
Epithelial rests of Malassez
The cervical loop

21. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
The outer cells of the dental papilla and the central cells of the dental papilla
Induction
The enamel organ is compressed

22. What is the cementum matrix called?
Cementoid
Development of one or more extra teeth
Dentin and alveolar bone
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

23. What will the dental papilla eventually form?
It disintegrates as the developing oral mucosa comes to line the oral cavity
As a result of the apposition of cementum over dentin
Future dentin and pulp tissue
Epithelial rests of Malassez

24. What are the clinical ramifications of enamel dysplasia?
Apposition of the cementum
Morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
A mineralized cylinder - the dentinal tubule

25. What is enamel dysplasia?
Proliferation
Outer
Faulty development of enamel from interference involving ameloblasts
The dental sac

26. What stage does the dental tissues subsequently fully mineralize
Induction - proliferation
Maturation
Into odontoblasts
Proliferation

27. What do the odontoblasts do?
The basement membrane
Only dentinal tubules with processes
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Common on permanent molars or cingulum of anterior teeth

28. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Odontoclasts
Osteocytes
Tooth germ
4 types

29. What are the etiological factors for supernumerary teeth?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental tissues secreted as matrix in successive layers.
Hereditary
Alveolar bone

30. What wll the inner enamel epithelium differentiate into?
Dental tissues secreted as matrix in successive layers.
Cementocytes
Enamel secreting cells (ameloblasts)
There is unequal growth in different parts of the tooth bud

31. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Sphere of enamel on root
The ameloblasts
Into odontoblasts
Maturation

32. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
The enamel organ - dental papilla - dental sac
The enamel organ is compressed
Tooth germ

33. The oral epithelium is induced by the ectomesenchyme to produce what?
9th to 10th weeks
The dental lamina
Dentin secreting cells (odontoblats)
Oral epithelium

34. What stage does anodontia occur?
Initiation stage
The primordium of the pulp
Proliferation - differentiation - morphogenesis
Enamel

35. Which teeth are nonsuccedaneous?
Extra cusp due to effects on enamel organ
The permanent molars
Enamel
Cementocytes

36. What are the mature cells for alveolar bone?
Dental papilla
Traumatic injury or crowding of teeth
Tooth germ tries to divide
Osteocytes

37. What is tubercle?
The basement membrane
Enamel organ
The enamel - dentin - and cementum are secreted in successive layers
Extra cusp due to effects on enamel organ

38. What happens during the apposition stage?
The enamel organ is compressed
Dental tissues secreted as matrix in successive layers.
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 - dental papilla - dental sac

39. The stellate reticulum is located inner or outer?
Outer
Cementocytes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
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

40. When does macro/microdontia occur?
Bud 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
Cementocytes
Ameloblasts

41. What are the clinical ramifications of micro/macrodontia?
Enamel organ
The basement membrane
The stellate reticulum
Commonly involves permanent maxillary lateral incisor and 3rd molars

42. What are the etiological factors for enamel pearl?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Abnormally small teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Displacement of ameloblasts to root surface

43. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The cervical loop
Differentiation - proliferation - morphogenesis
Dental papilla
Initiation

44. What type of tissue is dentin - cementum - and alveolar bone?
Connective
The ectomesenchyme
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

45. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Sphere of enamel on root
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Maturation
The bud stage

46. What are the etiological factors for dens in dente and gemination?
Apposition of the cementum
Hereditary
The cementum - PDL - and alveolar bone
Enamel organ

47. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The outer enamel epithelium
Preameloblasts
A bilayer rim that consists only IEE and OEE
Future dentin and pulp tissue

48. The stratum intermediate is located inner or outer?
Into odontoblasts
Inner
Dental follicle
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

49. What is the process involved in the maturation stage?
Maturation
There is unequal growth in different parts of the tooth bud
Dens in dente - gemination - tubercle - and fusion
The ectomesenchyme

50. What is gemination?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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
Tooth germ tries to divide
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy