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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 is the time span for the bell stage?
11th to 12th weeks
Differentiation
Imbrication lines of von Ebner
The cementum - PDL - and alveolar bone

2. What is macrodontia?
Abnormally large teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Extra cusp due to effects on enamel organ
Proliferation

3. The stellate reticulum is located inner or outer?
The bud stage
There are none - they are lost with eruption
Proliferation
Outer

4. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontoclasts
The apposition of the enamel matrix

5. What is gemination?
The apposition of the enamel matrix
Tooth germ tries to divide
Cementocytes
Tooth germ

6. What is the process involved in the maturation stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
6th to 7th weeks
Ameloblasts
Maturation

7. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Enamel
Dental papilla
Bud stage
The basement membrane

8. What is the time span for the bud stage?
Enamel organ
8th week
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme - which was influenced by the neural crest cells

9. What hard tissue is can not have tissue formation after eruption?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectomesenchyme
Epithelial
Enamel

10. What are the processes involved in the cap stage?
Union of 2 adjacent tooth germs
The ameloblasts
Proliferation - differentiation - morphogenesis
Dentin secreting cells (odontoblats)

11. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Odontogenesis
Epithelial rests of Malassez
Commonly involves permanent maxillary lateral incisor and 3rd molars
Differentiation - proliferation - morphogenesis

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
Arrest and reversal lines
It disintegrates as the developing oral mucosa comes to line the oral cavity
8th week

13. What are the incremental lines for cementum and alveolar bone?
Proliferation
Tooth germ
Only dentinal tubules with processes
Arrest and reversal lines

14. What hard tissue has vascularity?
Alveolar bone
Common on permanent molars or cingulum of anterior teeth
Common with permanent maxillary molars
Hereditary

15. What are the major components of the tooth germ?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Ameloblasts
The cementum - PDL - and alveolar bone
The enamel organ - dental papilla - dental sac

16. What is an enamel pearl?
Tooth germ
Lines of Retzuis
Preameloblasts
Sphere of enamel on root

17. What are the formative cells for dentin?
Dental papilla
Dental tissues secreted as matrix in successive layers.
Odontoblasts
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

18. What are the etiological factors for fusion?
Common on permanent molars or cingulum of anterior teeth
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
Pressure on the area
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

19. What are the odontoblastic processes is contained in what?
Absence of single or multiple teeth
A mineralized cylinder - the dentinal tubule
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Initiation

20. What are the etiological factors for dens in dente and gemination?
As a result of the apposition of cementum over dentin
Odontoclasts
Hereditary in localized form. endocrine dysfunction is complete
Hereditary

21. How many types of cells are found in the enamel organ in the bell stage?
The outer cells of the dental papilla and the central cells of the dental papilla
Lines of Retzuis
4 types
Extra cusp due to effects on enamel organ

22. What is anodontia?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Development of one or more extra teeth
Absence of single or multiple teeth
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

23. What are the clinical ramifications of fusion?
Dental tissues secreted as matrix in successive layers.
The ectomesenchyme
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
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

24. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
8th week
The enamel organ - dental papilla - dental sac
Trauma - pressure or metabolic disease

25. What will the inner cells of the dental lamina differentiates into?
Odontoblasts
The primordium of the pulp
8th week
May be confused as calculus deposit on root

26. What type of tissue is dentin - cementum - and alveolar bone?
Only dentinal tubules with processes
Connective
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Morphogenesis

27. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Dental follicle
The ameloblasts
Hereditary

28. What are the etiological factors for supernumerary teeth?
The actual vertical movement of the tooth
Dental papilla
Initiation
Hereditary

29. What is the embryological background for enamel?
Cuboidal cells
Only dentinal tubules with processes
Enamel organ
Lines of Retzuis

30. What wll the inner enamel epithelium differentiate into?
The outer cells of the dental papilla and the central cells of the dental papilla
The stellate reticulum
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel secreting cells (ameloblasts)

31. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Union of 2 adjacent tooth germs
Outer

32. What is fusion?
When the gingiva recedes and no actual tooth movement takes place
Enamel pearl - enamel dysplasia - and concresence
Future dentin and pulp tissue
Union of 2 adjacent tooth germs

33. The oral epithelium is induced by the ectomesenchyme to produce what?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel
The dental lamina
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

34. When does the tooth bud become a tooth germ?
Initiation
The dental lamina
The basement membrane
In the cap stage

35. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The tooth germ
Imbrication lines of von Ebner
The basement membrane
The dental sac

36. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Pressure on the area
Enamel secreting cells (ameloblasts)
Dental papilla
Cementocytes

37. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Epithelial rests of Malassez
Dentin and alveolar bone
The basement membrane that seperates the enamel organ and dental papilla

38. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Epithelial
Tall columnar cells
Hereditary
The ameloblasts place an acellular dental cuticle on the new enamel surface

39. What is another name for the dental sac?
The ameloblasts
A mineralized cylinder - the dentinal tubule
Enamel organ invaginates into the dental papilla
Dental follicle

40. What kind of cells occur in the outer enamel epithelium in the bell stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoblasts
Induction - proliferation
Cuboidal cells

41. What are the formative cells for enamel?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Ameloblasts
Arrest and reversal lines
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

42. What are the mature cells for cementum?
Osteoblasts
Absence of single or multiple teeth
Cementocytes
Arrest and reversal lines

43. What is the main process involved in the bud stage?
Traumatic injury or crowding of teeth
Proliferation
Enamel pearl - enamel dysplasia - and concresence
Trauma - pressure or metabolic disease

44. What hard tissue is innervated by nerves?
Abnormally small teeth
Dentin and alveolar bone
Pressure on the area
Tooth germ tries to divide

45. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The dental sac
Dens in dente - gemination - tubercle - and fusion
It disintegrates as the developing oral mucosa comes to line the oral cavity
Only dentinal tubules with processes

46. When does macro/microdontia occur?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Common with permanent maxillary molars
Differentiation - proliferation - morphogenesis
Bud stage

47. What is the site for the future dentioenamel junction?
Tooth germ tries to divide
Epithelial
The basement membrane that seperates the enamel organ and dental papilla
Dentin secreting cells (odontoblats)

48. What layer serves as protection for the enamel organ?
Proliferation
The outer enamel epithelium
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental papilla

49. What happens when the reduced enamel epithelium is created?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Hereditary
Faulty development of enamel from interference involving ameloblasts
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

50. Which teeth are nonsuccedaneous?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The permanent molars
Epithelial
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics