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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. What happens during the bud stage?
Odontoblastic process
Dentin and alveolar bone
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The dental sac

2. What is the time span for the bud stage?
Cementocytes
8th week
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The dental sac

3. What is the function of the Hertwig's epithelial root sheath?
Abnormally large teeth
Induction - proliferation
Tall columnar cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

4. What are the formative cells for enamel?
The ectomesenchyme
Preameloblasts
11th to 12th weeks
Ameloblasts

5. The stellate reticulum is located inner or outer?
Outer
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Compressed layer of flat to cuboidal cells

6. What is concrescence?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Apposition of the cementum
Union of root structure of two or more teeth by cementum
Local or systemic or hereditary

7. What are the etiological factors for supernumerary teeth?
The basement membrane that seperates the enamel organ and dental papilla
Hereditary
Dental tissues secreted as matrix in successive layers.
Osteocytes

8. What hard tissue is can not have tissue formation after eruption?
Enamel
A bilayer rim that consists only IEE and OEE
In the cap stage
The ameloblasts

9. When does the process of root development take place?
Maturation
Initiation stage
Sphere of enamel on root
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

10. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Cuboidal cells
When the gingiva recedes and no actual tooth movement takes place
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

11. What are the etiological factors of tubercle?
Enamel organ
Trauma - pressure or metabolic disease
Commonly involves permanent maxillary lateral incisor and 3rd molars
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

12. What is amelogenisis?
The apposition of the enamel matrix
Abnormally large teeth
Enamel
Tooth germ tries to divide

13. What are the etiological factors for dens in dente and gemination?
Initiation stage
Enamel secreting cells (ameloblasts)
The ectomesenchyme
Hereditary

14. What are the mature cells for dentin?
Lines of Retzuis
Enamel
Hereditary in localized form. endocrine dysfunction is complete
Only dentinal tubules with processes

15. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
It disintegrates as the developing oral mucosa comes to line the oral cavity
Absence of single or multiple teeth
Dentin and alveolar bone

16. The preameloblasts induce dental papilla cells to differentiate into what?
Maturation
Tooth germ
Into odontoblasts
The ectomesenchyme

17. What is the primordium of the tooth?
Enamel pearl - enamel dysplasia - and concresence
Absence of single or multiple teeth
The tooth germ
It disintegrates as the developing oral mucosa comes to line the oral cavity

18. Passive eruption
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
When the gingiva recedes and no actual tooth movement takes place
Cuboidal cells

19. Tooth development
Outer
Odontogenesis
Extra cusp due to effects on enamel organ
A mineralized cylinder - the dentinal tubule

20. What is the main process involved in initiation?
The tooth germ
Induction
Differentiation
Abnormally large teeth

21. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Cementocytes
The apposition of the enamel matrix

22. What are the major components of the tooth germ?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
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 enamel organ - dental papilla - dental sac
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

23. What is the time span for the bell stage?
The bud stage
11th to 12th weeks
Dental follicle
The dental sac

24. What are the etiological factors for anodontia?
The enamel organ
Dentin and alveolar bone
Absence of single or multiple teeth
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

25. Where is the dental papilla originally derived from?
The dental sac
The ectomesenchyme - which was influenced by the neural crest cells
Enamel organ
Epithelial rests of Malassez

26. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Tooth germ
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 ectomesenchyme

27. What is macrodontia?
Abnormally large teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental tissues fully mineralize to their mature levels.
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

28. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Epithelial
The dental sac
Extra cusp due to effects on enamel organ
When the gingiva recedes and no actual tooth movement takes place

29. What happens during the cap stage?
Tooth germ
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.
Pressure on the area
Dentin and alveolar bone

30. What happens when the reduced enamel epithelium is created?
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
Dental follicle
Faulty development of enamel from interference involving ameloblasts
The tooth germ

31. What happens during the appositional stage?
Absence of single or multiple teeth
Enamel
The enamel - dentin - and cementum are secreted in successive layers
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

32. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Ameloblasts
The actual vertical movement of the tooth
11th to 12th weeks
Dental papilla

33. What is cementogenisis?
Common on permanent molars or cingulum of anterior teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
Apposition of the cementum

34. What hard tissue has vascularity?
The enamel organ is compressed
Enamel
Imbrication lines of von Ebner
Alveolar bone

35. What stage does anodontia occur?
Inner
Initiation stage
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The dental sac

36. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
8th week
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ameloblasts place an acellular dental cuticle on the new enamel surface
Abnormally large teeth

37. What do the odontoblasts do?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

38. What are the processes involved in the cap stage?
Apposition of the cementum
When the gingiva recedes and no actual tooth movement takes place
Proliferation - differentiation - morphogenesis
Cementoblasts

39. What processes are involved in the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
Induction
The ameloblasts place an acellular dental cuticle on the new enamel surface
Differentiation - proliferation - morphogenesis

40. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
8th week
The bud stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary in localized form. endocrine dysfunction is complete

41. What are the development disturbances of the apposition and maturation stages?
The cervical loop
Maturation
Enamel pearl - enamel dysplasia - and concresence
The dental sac

42. What are the etiological factors for fusion?
Initiation stage
Pressure on the area
Cementocytes
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

43. What are the formative cells for cementum?
The ectomesenchyme - which was influenced by the neural crest cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Union of root structure of two or more teeth by cementum
Cementoblasts

44. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Dental follicle
4 types
During the cap stage

45. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
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 ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel

46. What is tubercle?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Extra cusp due to effects on enamel organ
Differentiation - proliferation - morphogenesis
6th to 7th weeks

47. What is the outer portion of the ectoderm in the initiation stage?
Epithelial rests of Malassez
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontoblastic process
Oral epithelium

48. What is the predominate process in the bell stage?
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane
Common on permanent molars or cingulum of anterior teeth
Differentiation

49. What are the incremental lines for enamel?
Lines of Retzuis
The enamel organ is compressed
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
Bud stage

50. What are the etiological factors for micro/macrodontia?
Extra cusp due to effects on enamel organ
Common with permanent maxillary molars
Hereditary in localized form. endocrine dysfunction is complete
Enamel organ