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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. Which layer in the bell stage has star shaped cells?
Hereditary in localized form. endocrine dysfunction is complete
Differentiation
The stellate reticulum
Dental papilla

2. What are the incremental lines for dentin?
The primordium of the pulp
Imbrication lines of von Ebner
Apposition of the cementum
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

3. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Ameloblasts
The dental lamina
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.

4. What are the etiological factors for fusion?
Extra cusp due to effects on enamel organ
Pressure on the area
May be confused as calculus deposit on root
Imbrication lines of von Ebner

5. What is another name for the dental sac?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental follicle
4 types

6. What happens during the bud stage?
Future dentin and pulp tissue
Initiation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoblastic process

7. Active eruption
The actual vertical movement of the tooth
Hereditary
Enamel organ invaginates into the dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

8. What is anodontia?
Dental tissues secreted as matrix in successive layers.
Ameloblasts
Absence of single or multiple teeth
Sphere of enamel on root

9. What is the time span for the cap stage?
9th to 10th weeks
Alveolar bone
Morphogenesis
Odontogenesis

10. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Initiation stage
Local or systemic or hereditary
There are none - they are lost with eruption

11. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Into odontoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoclasts
Bud stage

12. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dentin and alveolar bone
Epithelial rests of Malassez
Apposition of the cementum

13. How many types of cells are found in the enamel organ in the bell stage?
The dental lamina
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Absence of single or multiple teeth
4 types

14. What does the cervical loop consist of?
Maturation
A bilayer rim that consists only IEE and OEE
Enamel
There are none - they are lost with eruption

15. What are the incremental lines for enamel?
Differentiation - proliferation - morphogenesis
The basement membrane that seperates the enamel organ and dental papilla
May be confused as calculus deposit on root
Lines of Retzuis

16. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The enamel organ is compressed
Cementoblasts
The basement membrane
Odontoblastic process

17. What is microdontia?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Abnormally small teeth
Cementoid

18. Where does the primordium of the permanent dentition develop?
Cementoid
Odontoclasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel organ

19. What are the processes involved in the cap stage?
Enamel
Proliferation - differentiation - morphogenesis
The dental lamina
Enamel organ invaginates into the dental papilla

20. What is the primordium of the tooth?
The tooth germ
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Proliferation
Cuboidal cells

21. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Trauma - pressure or metabolic disease
Faulty development of enamel from interference involving ameloblasts
Displacement of ameloblasts to root surface

22. What will the dental papilla eventually form?
Future dentin and pulp tissue
Odontoclasts
Imbrication lines of von Ebner
Lines of Retzuis

23. What is the main process involved in initiation?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoblasts
Induction
Enamel organ invaginates into the dental papilla

24. The stellate reticulum is located inner or outer?
Outer
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
8th week
The primordium of the pulp

25. What are the etiological factors for dens in dente and gemination?
The actual vertical movement of the tooth
Hereditary
Dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

26. What happens during the appositional stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Compressed layer of flat to cuboidal cells
The enamel - dentin - and cementum are secreted in successive layers
The basement membrane

27. What is the cap in the cap stage?
Outer
The ectoderm
The enamel organ
Initiation stage

28. What are the clinical ramifications of anodontia?
Cementoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Tooth germ tries to divide
The apposition of the enamel matrix

29. What is dens in dente?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The dental lamina
Enamel organ invaginates into the dental papilla
The outer enamel epithelium

30. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
6th to 7th weeks
Dental follicle
Apposition of the cementum
Tooth germ

31. Do odontoblasts start their secretion of matrix before the ameloblasts?
Common with permanent maxillary molars
In the cap stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

32. What happens during initiation?
Cementocytes
Apposition of the cementum
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
Odontoblasts

33. 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
8th week
Bud stage
Apposition of the cementum

34. What are the clinical ramifications of supernumerary teeth?
Tooth germ tries to divide
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Traumatic injury or crowding of teeth
The ectomesenchyme - which was influenced by the neural crest cells

35. What is the process involved in the maturation stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Future dentin and pulp tissue
Maturation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

36. What are the mature cells for cementum?
Dental tissues fully mineralize to their mature levels.
Induction
Development of one or more extra teeth
Cementocytes

37. What are the etiological factors for anodontia?
The ectomesenchyme - which was influenced by the neural crest cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental follicle
9th to 10th weeks

38. What stage does supernumerary teeth occur?
The ectomesenchyme - which was influenced by the neural crest cells
Local or systemic or hereditary
Initiation
The permanent molars

39. When does macro/microdontia occur?
The outer enamel epithelium
Arrest and reversal lines
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Bud stage

40. What is amelogenisis?
The apposition of the enamel matrix
The stellate reticulum
The outer cells of the dental papilla and the central cells of the dental papilla
4 types

41. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Union of root structure of two or more teeth by cementum
Bud stage
Oral epithelium

42. What are the clinical ramifications of dens in dente?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Traumatic injury or crowding of teeth
Odontoblasts

43. When does dens in dente occur?
During the cap stage
Tooth germ
Induction
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

44. What layer serves as protection for the enamel organ?
Proliferation
Abnormally small teeth
Dental tissues fully mineralize to their mature levels.
The outer enamel epithelium

45. What stage does anodontia occur?
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
Initiation stage
There are none - they are lost with eruption
Apposition of the cementum

46. When does the process of root development take place?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

47. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Pressure on the area
Proliferation
The basement membrane
Displacement of ameloblasts to root surface

48. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Connective
The ectomesenchyme - which was influenced by the neural crest cells
The primordium of the pulp

49. What are the etiological factors of tubercle?
As a result of the apposition of cementum over dentin
Tooth germ tries to divide
Trauma - pressure or metabolic disease
Local or systemic or hereditary

50. What is the embryological background for dentin - cementum and alveolar bone?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel organ - dental papilla - dental sac
Dental papilla
Trauma - pressure or metabolic disease