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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 will the inner cells of the dental lamina differentiates into?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Differentiation - proliferation - morphogenesis
The ectomesenchyme - which was influenced by the neural crest cells
The primordium of the pulp

2. What are the incremental lines for enamel?
Dental papilla
Lines of Retzuis
Commonly involves permanent maxillary lateral incisor and 3rd molars
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.

3. What is the time span for the cap stage?
4 types
Only dentinal tubules with processes
9th to 10th weeks
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

4. What is the main process involved in initiation?
Induction
The dental lamina
Morphogenesis
8th week

5. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
The basement membrane
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Absence of single or multiple teeth

6. What are the clinical ramifications of micro/macrodontia?
Development of one or more extra teeth
Preameloblasts
The ectomesenchyme - which was influenced by the neural crest cells
Commonly involves permanent maxillary lateral incisor and 3rd molars

7. What are the etiological factors for enamel pearl?
Cementoblasts
Faulty development of enamel from interference involving ameloblasts
The cementum - PDL - and alveolar bone
Displacement of ameloblasts to root surface

8. What is an enamel pearl?
Dental tissues fully mineralize to their mature levels.
Maturation
Sphere of enamel on root
Dental follicle

9. What does the cervical loop consist of?
The ectoderm
A bilayer rim that consists only IEE and OEE
The enamel - dentin - and cementum are secreted in successive layers
Dental papilla

10. What are the clinical ramifications of enamel pearl?
Osteoblasts
Tooth germ
Dens in dente - gemination - tubercle - and fusion
May be confused as calculus deposit on root

11. What are the development disturbances of the apposition and maturation stages?
Oral epithelium
Enamel pearl - enamel dysplasia - and concresence
Union of root structure of two or more teeth by cementum
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

12. What are the mature cells for enamel?
There are none - they are lost with eruption
Hereditary in localized form. endocrine dysfunction is complete
Differentiation
The basement membrane

13. The oral epithelium is induced by the ectomesenchyme to produce what?
Imbrication lines of von Ebner
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental lamina
There is unequal growth in different parts of the tooth bud

14. What are the formative cells for cementum?
9th to 10th weeks
Arrest and reversal lines
Morphogenesis
Cementoblasts

15. Where is the dental sac originally derived from?
Proliferation
The actual vertical movement of the tooth
The ectomesenchyme
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

16. Active eruption
Local or systemic or hereditary
Dental follicle
The actual vertical movement of the tooth
The enamel organ

17. What is amelogenisis?
Absence of single or multiple teeth
During the cap stage
The apposition of the enamel matrix
Trauma - pressure or metabolic disease

18. What type of tissue is dentin - cementum - and alveolar bone?
Connective
The ectoderm
Dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity

19. What are the etiological factors for fusion?
Alveolar bone
Displacement of ameloblasts to root surface
The stellate reticulum
Pressure on the area

20. What processes are involved in the bell stage?
11th to 12th weeks
Differentiation - proliferation - morphogenesis
The ameloblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity

21. What are succedaneous teeth?
Arrest and reversal lines
Into odontoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The permanent molars

22. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Initiation
The ameloblasts
Hereditary

23. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
The primordium of the pulp
Enamel
Initiation

24. What are supernumerary teeth?
9th to 10th weeks
Cuboidal cells
Development of one or more extra teeth
Dentin and alveolar bone

25. What happens during the appositional stage?
Maturation
The enamel - dentin - and cementum are secreted in successive layers
Abnormally large teeth
Local or systemic or hereditary

26. What are the cell layers found in the enamel organ in the bell stage?
Enamel pearl - enamel dysplasia - and concresence
The tooth germ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The bud stage

27. What are the mature cells for dentin?
Only dentinal tubules with processes
Tall columnar cells
A bilayer rim that consists only IEE and OEE
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

28. What is the cap in the cap stage?
Absence of single or multiple teeth
The ectoderm
The enamel organ
In the cap stage

29. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
A mineralized cylinder - the dentinal tubule
Osteoblasts

30. When does dens in dente occur?
A bilayer rim that consists only IEE and OEE
During the cap stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

31. What is the primordium of the tooth?
The outer cells of the dental papilla and the central cells of the dental papilla
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The tooth germ

32. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Common with permanent maxillary molars
Dental papilla
Outer
The bud stage

33. What happens during the bell stage?
Dens in dente - gemination - tubercle - and fusion
Odontoblastic process
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Union of root structure of two or more teeth by cementum

34. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
When the gingiva recedes and no actual tooth movement takes place
Ameloblasts
6th to 7th weeks
The basement membrane

35. What is the cementum matrix called?
Imbrication lines of von Ebner
The bud stage
The enamel organ is compressed
Cementoid

36. What are the etiological factors of concrescence?
Cementoblasts
During the cap stage
The enamel organ is compressed
Traumatic injury or crowding of teeth

37. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementocytes
The ectomesenchyme
Dens in dente - gemination - tubercle - and fusion

38. Which teeth are nonsuccedaneous?
The permanent molars
Common with permanent maxillary molars
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla

39. What are the mature cells for alveolar bone?
Induction
Oral epithelium
Osteocytes
Cementoblasts

40. What stage does supernumerary teeth occur?
Cementoblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Traumatic injury or crowding of teeth
Initiation

41. What is the time span for the bud stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
There are none - they are lost with eruption
Induction
8th week

42. What type of tissue is enamel?
Traumatic injury or crowding of teeth
Sphere of enamel on root
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Epithelial

43. What is another name for the dental sac?
Dental follicle
Dentin secreting cells (odontoblats)
The ectoderm
The dental lamina

44. What will the dental papilla eventually form?
Odontoblasts
Future dentin and pulp tissue
The bud stage
Faulty development of enamel from interference involving ameloblasts

45. What is the main process involved in the bud stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Proliferation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Only dentinal tubules with processes

46. Which layer in the bell stage has star shaped cells?
Morphogenesis
Dental tissues fully mineralize to their mature levels.
The stellate reticulum
Development of one or more extra teeth

47. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The enamel organ
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.
It disintegrates as the developing oral mucosa comes to line the oral cavity
Initiation

48. What are the etiological factors of tubercle?
Differentiation - proliferation - morphogenesis
Enamel secreting cells (ameloblasts)
Trauma - pressure or metabolic disease
May be confused as calculus deposit on root

49. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Dental follicle
The dental sac
Common with permanent maxillary molars
9th to 10th weeks

50. What layer serves as protection for the enamel organ?
8th week
The outer enamel epithelium
6th to 7th weeks
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity