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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 maturation stage?
Dental tissues secreted as matrix in successive layers.
Dentin and alveolar bone
Dental tissues fully mineralize to their mature levels.
The basement membrane

2. What is dens in dente?
Alveolar bone
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel organ invaginates into the dental papilla
Initiation stage

3. What stage does anodontia occur?
9th to 10th weeks
Tooth germ tries to divide
Apposition of the cementum
Initiation stage

4. What is the time span for 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
9th to 10th weeks
The bud stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

5. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Induction
Preameloblasts
Dental papilla
Enamel secreting cells (ameloblasts)

6. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Into odontoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Initiation stage

7. The stellate reticulum is located inner or outer?
Abnormally small teeth
Outer
A mineralized cylinder - the dentinal tubule
Enamel organ

8. Passive eruption
There is unequal growth in different parts of the tooth bud
Enamel organ
Odontoblastic process
When the gingiva recedes and no actual tooth movement takes place

9. What happens during the appositional stage?
The cervical loop
The enamel - dentin - and cementum are secreted in successive layers
Faulty development of enamel from interference involving ameloblasts
Hereditary

10. What are the odontoblastic processes is contained in what?
Abnormally large teeth
Connective
Initiation
A mineralized cylinder - the dentinal tubule

11. What are the clinical ramifications of supernumerary teeth?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There is unequal growth in different parts of the tooth bud
The ectoderm
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

12. What are the major components of the tooth germ?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Only dentinal tubules with processes
The basement membrane that seperates the enamel organ and dental papilla
The enamel organ - dental papilla - dental sac

13. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary in localized form. endocrine dysfunction is complete
During the cap stage
Hereditary

14. What will the dental sac give rise to?
Proliferation - differentiation - morphogenesis
The cementum - PDL - and alveolar bone
Hereditary
Proliferation

15. What hard tissue has vascularity?
Proliferation
11th to 12th weeks
Odontoblastic process
Alveolar bone

16. What are the incremental lines for dentin?
Enamel organ invaginates into the dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Imbrication lines of von Ebner
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

17. What happens when the reduced enamel epithelium is created?
Abnormally small teeth
Odontoblastic process
Cementoblasts
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

18. What is the cementum matrix called?
During the cap stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementoid
Cementoblasts

19. What is anodontia?
Maturation
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
Absence of single or multiple teeth

20. How many types of cells are found in the enamel organ in the bell stage?
4 types
Induction - proliferation
The cementum - PDL - and alveolar bone
There is unequal growth in different parts of the tooth bud

21. What kind of cells occur in the outer enamel epithelium in the bell stage?
The ectomesenchyme
Cuboidal cells
Inner
The apposition of the enamel matrix

22. What are succedaneous teeth?
Oral epithelium
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel - dentin - and cementum are secreted in successive layers

23. What is the time span for the bell stage?
The apposition of the enamel matrix
The ectomesenchyme
11th to 12th weeks
4 types

24. What are the etiological factors for enamel pearl?
Compressed layer of flat to cuboidal cells
Displacement of ameloblasts to root surface
Odontogenesis
The stellate reticulum

25. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Enamel
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The bud stage
Connective

26. What are the etiological factors of tubercle?
Common on permanent molars or cingulum of anterior teeth
Cementoblasts
Trauma - pressure or metabolic disease
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

27. What type of tissue is enamel?
Traumatic injury or crowding of teeth
Union of 2 adjacent tooth germs
Epithelial
Compressed layer of flat to cuboidal cells

28. What are the clinical ramifications of gemination?

29. What processes are involved with the apposition stage?
The bud stage
Induction - proliferation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Proliferation

30. What is the time span for the bud stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
8th week
Epithelial
Inner

31. When does macro/microdontia occur?
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.
There is unequal growth in different parts of the tooth bud
Absence of single or multiple teeth
Bud stage

32. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Tooth germ
Compressed layer of flat to cuboidal cells
Dentin secreting cells (odontoblats)

33. What kind of cells occur in the inner enamel epithelium?
Enamel organ invaginates into the dental papilla
Tall columnar cells
The ectomesenchyme
In the cap stage

34. When does the tooth bud become a tooth germ?
As a result of the apposition of cementum over dentin
Enamel organ
Dental tissues secreted as matrix in successive layers.
In the cap stage

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

36. Where does the primordium of the permanent dentition develop?
When the gingiva recedes and no actual tooth movement takes place
Commonly involves permanent maxillary lateral incisor and 3rd molars
The tooth germ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

37. What are entrapped cementoblasts called?
Cementocytes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
There is unequal growth in different parts of the tooth bud
The permanent molars

38. What are supernumerary teeth?
Dental follicle
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Development of one or more extra teeth
When the gingiva recedes and no actual tooth movement takes place

39. What are the mature cells for alveolar bone?
Maturation
Osteocytes
Tooth germ tries to divide
8th week

40. How is the reduced enamel epithelium created?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel organ is compressed
Maturation
The permanent molars

41. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementocytes
Odontoclasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

42. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dental tissues fully mineralize to their mature levels.
8th week
The enamel - dentin - and cementum are secreted in successive layers
It disintegrates as the developing oral mucosa comes to line the oral cavity

43. 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
Initiation
Dentin secreting cells (odontoblats)
Hereditary in localized form. endocrine dysfunction is complete

44. What are the incremental lines for enamel?
Imbrication lines of von Ebner
The enamel organ - dental papilla - dental sac
Lines of Retzuis
Tooth germ tries to divide

45. What are the etiological factors for fusion?
Lines of Retzuis
Proliferation
Pressure on the area
Apposition of the cementum

46. What kind of cells reside in the stratum intermediate?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Future dentin and pulp tissue
The cervical loop
Compressed layer of flat to cuboidal cells

47. What is cementogenisis?
The permanent molars
Apposition of the cementum
Sphere of enamel on root
Epithelial

48. What is the embryological background for dentin - cementum and alveolar bone?
The basement membrane
During the cap stage
Compressed layer of flat to cuboidal cells
Dental papilla

49. Tooth development
Tooth germ
Induction - proliferation
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.
Odontogenesis

50. What is the predominate process of the cap stage?
Compressed layer of flat to cuboidal cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Epithelial
Morphogenesis