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. Where is the enamel matrix secreted from by the ameloblasts?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

2. What is the time span for initiation?
Osteoblasts
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Development of one or more extra teeth
6th to 7th weeks

3. When does dens in dente occur?
The outer cells of the dental papilla and the central cells of the dental papilla
Odontoclasts
Union of root structure of two or more teeth by cementum
During the cap stage

4. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Dental follicle
The bud stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
Common with permanent maxillary molars

5. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Cementoblasts
Initiation stage
Differentiation - proliferation - morphogenesis

6. What are the mature cells for dentin?
Cementoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
May be confused as calculus deposit on root
Only dentinal tubules with processes

7. What is matrix?
The dental sac
Connective
Faulty development of enamel from interference involving ameloblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

8. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Dens in dente - gemination - tubercle - and fusion
The cementum - PDL - and alveolar bone
The actual vertical movement of the tooth

9. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Abnormally small teeth
The ectoderm
The ameloblasts place an acellular dental cuticle on the new enamel surface
Displacement of ameloblasts to root surface

10. What is the structure responsible for root development?
Proliferation
The cervical loop
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The stellate reticulum

11. What is cementogenisis?
Odontoblastic process
Apposition of the cementum
There is unequal growth in different parts of the tooth bud
Only dentinal tubules with processes

12. What are supernumerary teeth?
Dental follicle
Bud stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Development of one or more extra teeth

13. What is the predominate process in the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
Inner
Hereditary in localized form. endocrine dysfunction is complete
Differentiation

14. What is the primordium of the tooth?
The tooth germ
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
Outer
Faulty development of enamel from interference involving ameloblasts

15. What are the clinical ramifications of concrescence?
Pressure on the area
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Common with permanent maxillary molars
The cementum - PDL - and alveolar bone

16. What happens during the appositional stage?
Enamel secreting cells (ameloblasts)
The enamel - dentin - and cementum are secreted in successive layers
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Union of 2 adjacent tooth germs

17. What are the formative cells for enamel?
Ameloblasts
The dental lamina
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Displacement of ameloblasts to root surface

18. What happens during initiation?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Osteoblasts
Initiation
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 outer portion of the ectoderm in the initiation stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Oral epithelium
The enamel organ - dental papilla - dental sac
The bud stage

20. What is tubercle?
Abnormally large teeth
Extra cusp due to effects on enamel organ
The basement membrane
Cuboidal cells

21. What is an enamel pearl?
Cuboidal cells
Enamel organ
Union of 2 adjacent tooth germs
Sphere of enamel on root

22. What are the clinical ramifications of supernumerary teeth?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Induction - proliferation
Alveolar bone
Tooth germ

23. What is the time span for the cap stage?
9th to 10th weeks
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental tissues secreted as matrix in successive layers.
Dental papilla

24. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Lines of Retzuis
Osteocytes
There are none - they are lost with eruption

25. What will the inner cells of the dental lamina differentiates into?
Only dentinal tubules with processes
The permanent molars
Tooth germ
The primordium of the pulp

26. In the cap stage the tooth bud does not grow - what happens?
Osteocytes
The enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars
There is unequal growth in different parts of the tooth bud

27. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
When the gingiva recedes and no actual tooth movement takes place
In the cap stage
The ectoderm

28. The preameloblasts induce dental papilla cells to differentiate into what?
Maturation
Into odontoblasts
Osteoblasts
The permanent molars

29. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Preameloblasts
Abnormally small teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Outer

30. 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
A bilayer rim that consists only IEE and OEE
As a result of the apposition of cementum over dentin
Traumatic injury or crowding of teeth

31. Where is the dental sac originally derived from?
The ectoderm
The ectomesenchyme
Cementoblasts
The ameloblasts

32. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
A mineralized cylinder - the dentinal tubule
The basement membrane
4 types
The basement membrane that seperates the enamel organ and dental papilla

33. What is the function of the Hertwig's epithelial root sheath?
Extra cusp due to effects on enamel organ
The actual vertical movement of the tooth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Induction

34. What is concrescence?
Union of root structure of two or more teeth by cementum
The basement membrane that seperates the enamel organ and dental papilla
The basement membrane
Dental tissues secreted as matrix in successive layers.

35. What are the incremental lines for enamel?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Hereditary
Cementoid
Lines of Retzuis

36. What happens during the bell stage?
The enamel organ is compressed
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dental tissues fully mineralize to their mature levels.

37. The stellate reticulum is located inner or outer?
Outer
The bud stage
The cementum - PDL - and alveolar bone
Cementocytes

38. What processes are involved with the apposition stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Induction - proliferation
Morphogenesis
Epithelial rests of Malassez

39. What is the main process involved in the bud stage?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Proliferation
Traumatic injury or crowding of teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

40. What are the cell layers found in the enamel organ in the bell stage?
Tooth germ
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Maturation

41. What are the formative cells for dentin?
Differentiation - proliferation - morphogenesis
A bilayer rim that consists only IEE and OEE
Odontoblasts
Maturation

42. What are the developmental disturbances of the cap stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Ameloblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dens in dente - gemination - tubercle - and fusion

43. What will the dental sac give rise to?
The basement membrane
The cementum - PDL - and alveolar bone
Initiation stage
Tooth germ

44. When does macro/microdontia occur?
Cementocytes
Arrest and reversal lines
Bud stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

45. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Ameloblasts
The apposition of the enamel matrix
Development of one or more extra teeth

46. What are succedaneous teeth?
Enamel secreting cells (ameloblasts)
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Displacement of ameloblasts to root surface
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

47. What are the major components of the tooth germ?
Initiation
Enamel organ
Alveolar bone
The enamel organ - dental papilla - dental sac

48. What are the etiological factors for enamel pearl?
Common with permanent maxillary molars
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
Displacement of ameloblasts to root surface
Hereditary

49. What is the cementum matrix called?
Odontoclasts
The cementum - PDL - and alveolar bone
Tooth germ tries to divide
Cementoid

50. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Maturation
Into odontoblasts
8th week