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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. Where does the primordium of the permanent dentition develop?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The cementum - PDL - and alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
May be confused as calculus deposit on root

2. What are succedaneous teeth?
Displacement of ameloblasts to root surface
Apposition of the cementum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

3. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The stellate reticulum
The cervical loop
The basement membrane
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

4. What are the clinical ramifications of fusion?
The dental lamina
Enamel pearl - enamel dysplasia - and concresence
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Initiation stage

5. When does dens in dente occur?
Osteocytes
Induction - proliferation
The cementum - PDL - and alveolar bone
During the cap stage

6. What are the incremental lines for cementum and alveolar bone?
The basement membrane
The tooth germ
Dental tissues fully mineralize to their mature levels.
Arrest and reversal lines

7. Which teeth are nonsuccedaneous?
Cementoblasts
The ameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
The permanent molars

8. What happens during the appositional stage?
Common with permanent maxillary molars
Dentin secreting cells (odontoblats)
The enamel - dentin - and cementum are secreted in successive layers
Odontoblastic process

9. What are the mature cells for alveolar bone?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ is compressed
Osteocytes
Dentin secreting cells (odontoblats)

10. What are the clinical ramifications?
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
Hereditary in localized form. endocrine dysfunction is complete
Common on permanent molars or cingulum of anterior teeth
The ectoderm

11. What is the time span for the cap stage?
Induction - proliferation
9th to 10th weeks
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Morphogenesis

12. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Displacement of ameloblasts to root surface
Trauma - pressure or metabolic disease
When the gingiva recedes and no actual tooth movement takes place

13. The oral epithelium is induced by the ectomesenchyme to produce what?
Abnormally large teeth
The dental lamina
A mineralized cylinder - the dentinal tubule
Displacement of ameloblasts to root surface

14. How is the dentinocemental junction formed?
Morphogenesis
As a result of the apposition of cementum over dentin
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Maturation

15. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Oral epithelium
A mineralized cylinder - the dentinal tubule
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

16. What hard tissue has vascularity?
The actual vertical movement of the tooth
Morphogenesis
Enamel secreting cells (ameloblasts)
Alveolar bone

17. 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
The enamel - dentin - and cementum are secreted in successive layers
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel organ

18. What happens during initiation?
The ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
May be confused as calculus deposit on root
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

19. What is the main process involved in the bud stage?
Proliferation
The ectoderm
Osteoblasts
The enamel organ is compressed

20. What is microdontia?
Local or systemic or hereditary
There is unequal growth in different parts of the tooth bud
Cementoblasts
Abnormally small teeth

21. What are the etiological factors of concrescence?
A mineralized cylinder - the dentinal tubule
The enamel organ is compressed
Osteoblasts
Traumatic injury or crowding of teeth

22. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Future dentin and pulp tissue
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The enamel organ is compressed
It disintegrates as the developing oral mucosa comes to line the oral cavity

23. What is the predominate process in the bell stage?
Arrest and reversal lines
Differentiation
In the cap stage
Differentiation - proliferation - morphogenesis

24. What are supernumerary teeth?
Local or systemic or hereditary
Development of one or more extra teeth
A mineralized cylinder - the dentinal tubule
Induction

25. What is the time span for the bell stage?
11th to 12th weeks
Epithelial rests of Malassez
Maturation
Dental tissues secreted as matrix in successive layers.

26. What are the cell layers found in the enamel organ in the bell stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The ectoderm
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
11th to 12th weeks

27. What kind of cells occur in the outer enamel epithelium in the bell stage?
Common on permanent molars or cingulum of anterior teeth
Alveolar bone
Cuboidal cells
The basement membrane

28. What happens during the cap stage?
The cementum - PDL - and alveolar bone
Arrest and reversal lines
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.
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

29. What stage does supernumerary teeth occur?
Enamel organ invaginates into the dental papilla
Future dentin and pulp tissue
Initiation
The enamel organ

30. What are the etiological factors of tubercle?
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
Osteoblasts
Trauma - pressure or metabolic disease
Abnormally large teeth

31. What are the mature cells for enamel?
Dental papilla
There are none - they are lost with eruption
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Compressed layer of flat to cuboidal cells

32. What are the etiological factors for supernumerary teeth?
Dental papilla
Hereditary
The dental sac
Dentin and alveolar bone

33. What is macrodontia?
Cuboidal cells
Dentin and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers
Abnormally large teeth

34. What happens during the apposition stage?
Maturation
Cementocytes
Union of root structure of two or more teeth by cementum
Dental tissues secreted as matrix in successive layers.

35. What type of tissue is enamel?
May be confused as calculus deposit on root
Epithelial
Cuboidal cells
Trauma - pressure or metabolic disease

36. What processes are involved in the bell stage?
Union of root structure of two or more teeth by cementum
Maturation
There are none - they are lost with eruption
Differentiation - proliferation - morphogenesis

37. When does the process of root development take place?
Displacement of ameloblasts to root surface
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
6th to 7th weeks

38. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane
Inner
Into odontoblasts

39. What is matrix?
Only dentinal tubules with processes
Faulty development of enamel from interference involving ameloblasts
Alveolar bone
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

40. In the cap stage the tooth bud does not grow - what happens?
Extra cusp due to effects on enamel organ
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
There is unequal growth in different parts of the tooth bud

41. What is the structure responsible for root development?
Arrest and reversal lines
The cervical loop
Enamel organ invaginates into the dental papilla
Dental tissues fully mineralize to their mature levels.

42. What is the process involved in the maturation stage?
Proliferation - differentiation - morphogenesis
Lines of Retzuis
Enamel
Maturation

43. What is tubercle?
Extra cusp due to effects on enamel organ
Abnormally small teeth
Apposition of the cementum
Dens in dente - gemination - tubercle - and fusion

44. What are the mature cells for cementum?
Cementocytes
Development of one or more extra teeth
Differentiation
Union of root structure of two or more teeth by cementum

45. Do odontoblasts start their secretion of matrix before the ameloblasts?
Epithelial
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

46. What are the formative cells for cementum?
Cementoblasts
The basement membrane that seperates the enamel organ and dental papilla
The dental lamina
Proliferation - differentiation - morphogenesis

47. What are the clinical ramifications of dens in dente?
The basement membrane
As a result of the apposition of cementum over dentin
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

48. What layer serves as protection for the enamel organ?
The outer enamel epithelium
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dentin secreting cells (odontoblats)
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

49. What is the cap in the cap stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel organ
Pressure on the area
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

50. What is anodontia?
Initiation stage
There is unequal growth in different parts of the tooth bud
The dental lamina
Absence of single or multiple teeth