Test your basic knowledge |

Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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?
Odontoclasts
Dental follicle
The stellate reticulum
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

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

3. What are supernumerary teeth?
Development of one or more extra teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
4 types
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

4. What are the etiological factors of tubercle?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Trauma - pressure or metabolic disease
Dental papilla
The tooth germ

5. What is cementogenisis?
Bud stage
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.
The enamel - dentin - and cementum are secreted in successive layers
Apposition of the cementum

6. How many types of cells are found in the enamel organ in the bell stage?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The primordium of the pulp
The ectomesenchyme - which was influenced by the neural crest cells
4 types

7. What type of tissue is dentin - cementum - and alveolar bone?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Connective
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental lamina

8. What is anodontia?
Hereditary
Absence of single or multiple teeth
Dental tissues secreted as matrix in successive layers.
Cuboidal cells

9. The stellate reticulum is located inner or outer?
The primordium of the pulp
Induction
Outer
Into odontoblasts

10. What are the mature cells for alveolar bone?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Osteocytes
Displacement of ameloblasts to root surface
Dentin secreting cells (odontoblats)

11. What are the etiological factors for fusion?
Odontoblasts
Abnormally large teeth
Induction - proliferation
Pressure on the area

12. What stage does the dental tissues subsequently fully mineralize
Enamel pearl - enamel dysplasia - and concresence
Maturation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Odontoblasts

13. What is matrix?
The ectomesenchyme
Local or systemic or hereditary
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

14. What is the function of the Hertwig's epithelial root sheath?
The apposition of the enamel matrix
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Proliferation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

15. What happens during initiation?
Arrest and reversal lines
Local or systemic or hereditary
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
Dental papilla

16. What will the outer cells of the dental lamina differentiate into?
The cementum - PDL - and alveolar bone
Dentin secreting cells (odontoblats)
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The dental lamina

17. What are the major components of the tooth germ?
The permanent molars
Abnormally small teeth
The enamel organ - dental papilla - dental sac
The basement membrane

18. What is amelogenisis?
The enamel - dentin - and cementum are secreted in successive layers
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 apposition of the enamel matrix
Maturation

19. What is the time span for the cap stage?
4 types
Abnormally small teeth
9th to 10th weeks
Dentin secreting cells (odontoblats)

20. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Initiation
Cementoblasts
When the gingiva recedes and no actual tooth movement takes place

21. What happens during the maturation stage?
The primordium of the pulp
Differentiation
Future dentin and pulp tissue
Dental tissues fully mineralize to their mature levels.

22. Where is the dental papilla originally derived from?
Dens in dente - gemination - tubercle - and fusion
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
The ectomesenchyme - which was influenced by the neural crest cells
Preameloblasts

23. What is macrodontia?
Preameloblasts
The cementum - PDL - and alveolar bone
Abnormally large teeth
Enamel organ

24. What stage does anodontia occur?
Odontoblastic process
Hereditary in localized form. endocrine dysfunction is complete
Development of one or more extra teeth
Initiation stage

25. What will the dental sac give rise to?
Hereditary
Into odontoblasts
The cementum - PDL - and alveolar bone
The tooth germ

26. Where does the primordium of the permanent dentition develop?
Cementoblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

27. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
There are none - they are lost with eruption
The basement membrane
The enamel - dentin - and cementum are secreted in successive layers

28. What kind of cells reside in the stratum intermediate?
Faulty development of enamel from interference involving ameloblasts
Oral epithelium
Absence of single or multiple teeth
Compressed layer of flat to cuboidal cells

29. What is the embryological background for enamel?
Future dentin and pulp tissue
Enamel organ
Tooth germ tries to divide
Hereditary

30. What type of tissue is enamel?
The cervical loop
Cementoblasts
Morphogenesis
Epithelial

31. What is the main process involved in initiation?
The enamel organ
Enamel secreting cells (ameloblasts)
Induction
Cementoid

32. What are the mature cells for cementum?
The ectomesenchyme
The tooth germ
Cementocytes
Imbrication lines of von Ebner

33. What kind of cells occur in the outer enamel epithelium in the bell stage?
Union of 2 adjacent tooth germs
Induction - proliferation
Imbrication lines of von Ebner
Cuboidal cells

34. What are the formative cells for dentin?
Odontoblasts
Development of one or more extra teeth
Only dentinal tubules with processes
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

35. What processes are involved with the apposition stage?
Induction - proliferation
Union of root structure of two or more teeth by cementum
Compressed layer of flat to cuboidal cells
The bud stage

36. What is the predominate process of the cap stage?
Morphogenesis
Differentiation - proliferation - morphogenesis
Dental papilla
Ameloblasts

37. What is microdontia?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
9th to 10th weeks
Abnormally small teeth
Enamel pearl - enamel dysplasia - and concresence

38. What are the odontoblastic processes is contained in what?
Trauma - pressure or metabolic disease
The bud stage
Maturation
A mineralized cylinder - the dentinal tubule

39. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Induction
A bilayer rim that consists only IEE and OEE
The basement membrane
Dental tissues secreted as matrix in successive layers.

40. When does the process of root development take place?
The tooth germ
The ectomesenchyme - which was influenced by the neural crest cells
Compressed layer of flat to cuboidal cells
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

41. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
6th to 7th weeks
Epithelial
Odontoclasts

42. What will the dental papilla eventually form?
Future dentin and pulp tissue
Preameloblasts
Cementoblasts
The enamel organ - dental papilla - dental sac

43. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Dental papilla
Induction - proliferation
The ectomesenchyme - which was influenced by the neural crest cells

44. What are the development disturbances of the apposition and maturation stages?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Enamel pearl - enamel dysplasia - and concresence
Cementocytes
Differentiation

45. What is an enamel pearl?
Sphere of enamel on root
Arrest and reversal lines
The enamel organ - dental papilla - dental sac
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

46. What is the embryological background for dentin - cementum and alveolar bone?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Morphogenesis
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental papilla

47. When does the tooth bud become a tooth germ?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
9th to 10th weeks
Osteocytes
In the cap stage

48. What are the etiological factors for dens in dente and gemination?
The outer cells of the dental papilla and the central cells of the dental papilla
Induction - proliferation
Hereditary
8th week

49. 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 bud stage
Abnormally small teeth
Faulty development of enamel from interference involving ameloblasts

50. What are the mature cells for dentin?
Extra cusp due to effects on enamel organ
Only dentinal tubules with processes
Dental follicle
The cementum - PDL - and alveolar bone