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. What are supernumerary teeth?
There is unequal growth in different parts of the tooth bud
Development of one or more extra teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The dental lamina

2. Where does the primordium of the permanent dentition develop?
The actual vertical movement of the tooth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Future dentin and pulp tissue
Union of root structure of two or more teeth by cementum

3. Tooth development
Traumatic injury or crowding of teeth
Odontogenesis
Only dentinal tubules with processes
The primordium of the pulp

4. What are the formative cells for cementum?
Dental tissues secreted as matrix in successive layers.
Faulty development of enamel from interference involving ameloblasts
Odontogenesis
Cementoblasts

5. What stage does the dental tissues subsequently fully mineralize
Maturation
Morphogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
When the gingiva recedes and no actual tooth movement takes place

6. What will the inner cells of the dental lamina differentiates into?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dental follicle
The primordium of the pulp
Odontoclasts

7. What kind of cells reside in the stratum intermediate?
The apposition of the enamel matrix
Dental tissues secreted as matrix in successive layers.
Connective
Compressed layer of flat to cuboidal cells

8. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Into odontoblasts
Preameloblasts
Union of root structure of two or more teeth by cementum
Cuboidal cells

9. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Union of root structure of two or more teeth by cementum
Differentiation - proliferation - morphogenesis
Connective
The outer cells of the dental papilla and the central cells of the dental papilla

10. What are the clinical ramifications of enamel dysplasia?
Into odontoblasts
Dental tissues secreted as matrix in successive layers.
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

11. What is fusion?
Proliferation
Preameloblasts
Union of 2 adjacent tooth germs
The enamel - dentin - and cementum are secreted in successive layers

12. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Into odontoblasts
Enamel secreting cells (ameloblasts)
The enamel organ

13. What are the cell layers found in the enamel organ in the bell stage?
Displacement of ameloblasts to root surface
Cementoid
Induction
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

14. What is the time span for the cap stage?
Oral epithelium
Dental papilla
9th to 10th weeks
The ameloblasts place an acellular dental cuticle on the new enamel surface

15. The stellate reticulum is located inner or outer?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Outer
When the gingiva recedes and no actual tooth movement takes place
Local or systemic or hereditary

16. What does the cervical loop consist of?
The enamel organ
A bilayer rim that consists only IEE and OEE
Induction
Maturation

17. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dentin secreting cells (odontoblats)
Odontoblastic process
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Bud stage

18. What stage does anodontia occur?
Induction - proliferation
Outer
Enamel organ invaginates into the dental papilla
Initiation stage

19. In the cap stage the tooth bud does not grow - what happens?
Inner
The actual vertical movement of the tooth
Cementoblasts
There is unequal growth in different parts of the tooth bud

20. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ameloblasts place an acellular dental cuticle on the new enamel surface
The ectoderm
Arrest and reversal lines

21. 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
The ectoderm
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
4 types

22. What is the primordium of the tooth?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontogenesis
The tooth germ
Faulty development of enamel from interference involving ameloblasts

23. When does macro/microdontia occur?
Bud stage
Outer
Hereditary
Pressure on the area

24. What hard tissue is can not have tissue formation after eruption?
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme
Faulty development of enamel from interference involving ameloblasts
Enamel

25. Where is the dental papilla originally derived from?
Dental papilla
6th to 7th weeks
Differentiation
The ectomesenchyme - which was influenced by the neural crest cells

26. What do the odontoblasts do?
4 types
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Bud stage
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

27. Active eruption
The cementum - PDL - and alveolar bone
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The actual vertical movement of the tooth
Only dentinal tubules with processes

28. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Epithelial
Cementoid
Common on permanent molars or cingulum of anterior teeth

29. What are the mature cells for dentin?
Cementoid
Only dentinal tubules with processes
Imbrication lines of von Ebner
Maturation

30. What are the etiological factors for anodontia?
Outer
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Abnormally large teeth
The actual vertical movement of the tooth

31. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
The primordium of the pulp
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
The enamel organ is compressed

32. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Enamel pearl - enamel dysplasia - and concresence
Into odontoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Proliferation

33. What is the cementum matrix called?
8th week
During the cap stage
Differentiation - proliferation - morphogenesis
Cementoid

34. What are the mature cells for alveolar bone?
During the cap stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Osteocytes
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

35. What is cementogenisis?
Apposition of the cementum
Common on permanent molars or cingulum of anterior teeth
Dens in dente - gemination - tubercle - and fusion
Union of root structure of two or more teeth by cementum

36. What is gemination?
Enamel organ invaginates into the dental papilla
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Local or systemic or hereditary
Tooth germ tries to divide

37. What is the embryological background for enamel?
Sphere of enamel on root
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel organ
Odontoblastic process

38. What are the clinical ramifications of anodontia?
Dental follicle
Proliferation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

39. What hard tissue is innervated by nerves?
Maturation
Dentin and alveolar bone
Commonly involves permanent maxillary lateral incisor and 3rd molars
Outer

40. What is amelogenisis?
The apposition of the enamel matrix
During the cap stage
Abnormally small teeth
Odontoclasts

41. What is the main process involved in initiation?
Induction
The cervical loop
Dentin and alveolar bone
The outer enamel epithelium

42. When does the tooth bud become a tooth germ?
The ectoderm
Outer
Arrest and reversal lines
In the cap stage

43. What are the formative cells for alveolar bone?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
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.
Osteoblasts
Connective

44. What are the major components of the tooth germ?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cuboidal cells
The enamel organ - dental papilla - dental sac
Union of root structure of two or more teeth by cementum

45. What happens during the bell stage?
Only dentinal tubules with processes
Apposition of the cementum
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Tall columnar cells

46. What processes are involved in the bell stage?
Into odontoblasts
Differentiation - proliferation - morphogenesis
Epithelial rests of Malassez
Traumatic injury or crowding of teeth

47. Passive eruption
Odontoblastic process
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
When the gingiva recedes and no actual tooth movement takes place
Abnormally small teeth

48. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Alveolar bone
Morphogenesis
Pressure on the area

49. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
11th to 12th weeks
Maturation
Hereditary in localized form. endocrine dysfunction is complete

50. What are the odontoblastic processes is contained in what?
9th to 10th weeks
The basement membrane
A mineralized cylinder - the dentinal tubule
Tooth germ